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| 1 | Effect of turbulence models on predicting convective heat transfer to hydrocarbon fuel at supercritical pressure显示文摘A variety of turbulence models were used to perform numerical simulations of heat transfer for hydrocarbon fuel flowing upward and downward through uniformly heated vertical pipes at supercritical pressure. Inlet temperatures varied from 373 K to 663 K, with heat flux ranging from 300 k W/m^2 to 550 k W/m^2. Comparative analyses between predicted and experimental results were used to evaluate the ability of turbulence models to respond to variable thermophysical properties of hydrocarbon fuel at supercritical pressure. It was found that the prediction performance of turbulence models is mainly determined by the damping function, which enables them to respond differently to local flow conditions. Although prediction accuracy for experimental results varied from condition to condition, the shear stress transport(SST) and launder and sharma models performed better than all other models used in the study. For very small buoyancy-influenced runs, the thermal-induced acceleration due to variations in density lead to the impairment of heat transfer occurring in the vicinity of pseudo-critical points, and heat transfer was enhanced at higher temperatures through the combined action of four thermophysical properties: density, viscosity, thermal conductivity and specific heat. For very large buoyancyinfluenced runs, the thermal-induced acceleration effect was over predicted by the LS and AB models. | Tao Zhi Cheng Zeyuan Zhu Jianqin Li Haiwang | 2016 | Chinese Journal of Aeronautics2016，29，5： | 8 |
| 2 | Research and application of a power-flow-calculation method in multiterminal VSC-HVDC power grid显示文摘For demonstrating a multiterminal voltage-source converter(VSC)-based high-voltage DC(HVDC)(VSCHVDC) project, this study puts forward a technical route for calculating the power flow in a 500-kV VSC-HVDC power grid in comparison with that of an AC power grid. The Jacobian matrix used in the power-flow calculation was deduced through methods such as Newton–Laphson iteration and Taylor series expansion. Further, the operation effect of powerflow calculation on a true bipolar VSC-HVDC power grid was analyzed briefly. The elements of the Jacobian matrix corresponding to VSC were studied under the mode of droop control and the control strategy of VSC-HVDC power grid was analyzed in detail. The power-flow calculation model for VSC-HVDC power grid of the master–slave control mode was simplified using the PQ decomposition method of the power-flow calculation of an AC power grid. Moreover, a four-terminal model of the Zhangbei VSC-HVDC demonstration project was established and tested on MATLAB. The simulation results under two kinds of operating conditions were analyzed and compared to the results of BPA; the deviation between the power-flow results was studied. The results show that the proposed calculation method can provide a feasible support for calculating the power flow in VSC-HVDC grids. | Linlin Wu Xiaowei Fan Man Xu Zhendong Li Xiao Wang Xiaofei Zhang Haiwang Jin | 2019 | Global Energy Interconnection2019，2，1： | 8 |
| 3 | Turbulent characteristics and rotation correction of wall function in rotating channel with high local rotation parameter显示文摘The turbulent fluctuation and the rotation correction of wall function law are investigated in the entrance section of a rotating channel. The one-dimensional hot wire probe and the X-type probe are utilized to measure the boundary layer at four streamwise stations. Through the analysis on the boundary layer near the leading side and trailing side, it is found that the turbulent fluctuation is promoted in the trailing side whereas suppressed in the leading side. This difference is attributed to the Coriolis instability near the trailing side. In addition, considering the local rotation parameter Rc, whose maximum absolute value is 0.014, is larger than that in previous research, whose maximum value is 0.007, the whole process of the relaminarization is captured. To understand this phenomenon better, the effects of the generation term and the Coriolis term in the transport equation of the Reynolds stress are discussed. In addition, the rotation correction of the viscous-Coriolis region and the Coriolis region are discussed, a new revising method for the wall function is proposed. | Zhi TAO Huijie WU Ruquan YOU Haiwang LI Kuan WEI | 2018 | Chinese Journal of Aeronautics2018，31，10： | 4 |
| 4 | A STUDY ON THE COUNTER-INTUITIVE BEHAVIORS OF PIN-ENDED BEAMS UNDER PROJECTILE IMPACT显示文摘在射弹影响下面的结束大头针的横梁的违反直觉的行为在这篇论文与 ANSYS/LS-DYNA 被调查。它详细学习 theirdisplacement 时间历史曲线,最后的使变形的形状,精力关系和射弹影响与他们的违反直觉的行为有关的速度范围。他们的违反直觉的行为上的影响位置的影响也被讨论。结果显示出那不管横梁上的影响位置在哪儿,只要影响速度躺在一个合适的范围以内,卡住的横梁的违反直觉的行为将发生。相应于 thecounter 直觉的行为发生,在横梁的排水量历史曲线的反弹的数字随影响速度的增加从一些时间减少到零。相应于违反直觉的行为的横梁的最后的变丑模式将出现在对称的 andunsym 韵律的形式不管影响位置在哪儿;横梁的违反直觉的行为的发生 thefirst 的影响速度与影响位置的偏差慢慢地增加离开中间跨度。 | Li Haiwang Qin Dongqi | 2006 | Acta Mechanica Solida Sinica2006，19，2： | 3 |
| 5 | Soft Open Point Planning in Renewable-dominated Distribution Grids with Building Thermal Storage显示文摘With an increasing integration of intermittent distributed energy resources(DERs),the consequent voltage excursion and thermal overloading issues limit the self-sufficiency of distribution networks(DNs).The concept of soft open point(SOP)has been proposed as a promising solution to improve the hosting capacity of DNs.In this paper,considering the ability of building thermal storage(BTS)to increase the penetration of renewable energy in DNs,we provide an optimal planning framework for SOP and DER.The optimal planning model is aimed at minimizing the investment and operational costs while respecting various constraints,including the self-sufficiency requirement of the DN,SOP,building thermal storage capacity and DER operations,etc.A steady-state SOP model is formulated and linearized to be incorporated into the planning framework.To make full use of the BTS flexibility provided by ubiquitous buildings,a differential equation model for building thermal dynamics is formulated.A hybrid stochastic/robust optimization approach is adopted to depict the uncertainties in renewable energy and market prices.IEEE 33-bus feeder and a realistic DN in the metropolitan area of Caracas are tested to validate the effectiveness of the proposed framework and method.Case studies show that SOP/BTS plays a complementary and coordinated coupling role in the thermo-electric system,thereby effectively improving the hosting capacity and self-sufficiency of DNs. | Tiance Zhang Jianxiao Wang Haiwang Zhong Gengyin Li Ming Zhou Dejie Zhao | 2023 | CSEE Journal of Power and Energy Systems2023，9，1： | 3 |
| 6 | The cooling performance of three-row compound angle holes on the suction surface of a rotating turbine blade显示文摘Experiments were carried out to study the effects of compound angle,hole arrangement,and blowing ratio on the film cooling performance of multiple rows of holes on the suction surface of a turbine blade.The turbine worked at rotational speed of 600 rpm corresponding to the rotational Reynolds number of 5.36105.Three rows of cylindrical holes arranged in line or in stagger were drilled on the rotor blade suction surface at the streamwise location of 12.4%,17.8%,and 23.2%,respectively.Three compound angles,with the same streamwise angle of 45but different lateral deflection angles of 45,0,and45,were studied.The film cooling effectiveness was obtained using pressure sensitive paint(PSP)technique with average blowing ratios varied from 0.5 to 2.0.The results showed that the application of compound angle changes the jet direction in the near-hole region and makes the film spread laterally.Compared with the film cooling without compound angle,using positive and negative compound angle can improve overall average film cooling effectiveness by about 20%and 25%,respectively.The effects of the secondary flow also can be weakened.A stagger film trajectory arrangement can achieve more uniform film coverage with higher overall film cooling effectiveness.The film trajectory arrangement of a positive compound angle injection is determined by the combined effect of hole arrangement and blowing ratio.While,the film trajectory arrangement of a negative compound angle injection is almost the same as the hole arrangement and nearly does not change with the blowing ratio. | Zhiyu Zhou Haiwang Li Gang Xie Shuangzhi Xia Jianjun Zhou | 2021 | Propulsion and Power Research2021，10，1： | 2 |
| 7 | Atomic oxygen-resistant and transparent polyimide coatings from [3,5-bis(3-aminophenoxy)phenyl]diphenylphosphine oxide and aromatic dianhydrides: Preparation and characterization显示文摘 | Zhuo Li Haiwang Song Minhui He Jingang Liu Shiyong Yang | 2012 | Progress in Organic Coatings (-)2012，，1： | 2 |
| 8 | Experimental investigation of surface roughness effects on flow behavior and heat transfer characteristics for circular microchannels显示文摘This paper experimentally investigates the effect of surface roughness on flow and heat transfer characteristics in circular microchannels. All test pieces include 44 identical, parallel circular microchannels with diameters of 0.4 mm and 10 mm in length. The surface roughness of the microchannels is R_a= 0.86, 0.92, 1.02 lm, and the Reynolds number ranges from 150 to 2800.Results show that the surface roughness of the circular microchannels has remarkable effects on the performance of flow behavior and heat transfer. It is found that the Poiseuille and Nusselt numbers are higher when the relative surface roughness is larger. For flow behavior, the friction factor increases consistently with the increasing Reynolds number, and it is larger than the constant theoretical value for macrochannels. The Reynolds number for the transition from laminar to turbulent flow is about 1500, which is lower than the value for macrochannels. For the heat transfer property, Nusselt number also increases with increasing Reynolds number, and larger roughness contributes to higher Nusselt number. | Yuan Xing Tao Zhi Li Haiwang Tian Yitu | 2016 | Chinese Journal of Aeronautics2016，29，6： | 2 |
| 9 | Atomic oxygen-resistant and transparent polyimide coatings from [3,5-bis(3-aminophenoxy)phenyl]diphenylphosphine oxide and aromatic dianhydrides: Preparation and characterization显示文摘 | Zhuo Li Haiwang Song Minhui He Jingang Liu Shiyong Yang | 2012 | Progress in Organic Coatings (-)2012，，1： | 1 |
| 10 | Hot-wire experimental investigation on turbulent Prandtl number in a rotating non-isothermal turbulent boundary layer显示文摘This experiment used a parallel array of hot wire probes to simultaneously measure the temperature and velocity fields in the non-isothermal turbulent boundary layer of a rotating straight channel. The Reynolds numbers are 15,000 and 25,000, respectively. The rotation numbers are 0, 0.07, 0.14, 0.21 and 0.28, respectively. The purpose of this study is to calculate the turbulent Prandtl number in a rotating non-isothermal turbulent boundary layer. Due to the difficulty in measuring local turbulent Prandtl numbers, this study focuses on the average turbulent Prandtl numbers in the logarithmic region instead. Under static conditions, this value is taken as 0.9 normally. This research finds that rotation conditions can affect the turbulent Prandtl number by affecting the properties of velocity and temperature boundary layers. The change range of the turbulent Prandtl number is roughly 0.6–1.1. The influence of the leading side is greater than that of the trailing side, especially at high rotation numbers. This can provide validation and guidance for numerical simulation. Other information within the turbulent boundary layer is also discussed. It is hoped that this study would enhance our understanding of the mechanism of turbulent flow in the turbulent layer at rotating conditions. | Ran Gao Haiwang Li Ruquan You Gangfu Li Shuangzhi Xia | 2020 | Propulsion and Power Research2020，9，4： | 1 |
| 11 | Development of secondary flow field under rotating condition in a straight channel with square cross-section显示文摘The developing secondary flow fields in the entrance section of a rotating straight channel were experimentally investigated using Particle Image Velocimetry(PIV). The effects of streamwise position, Reynolds number and rotation number on the development of the secondary flow fields were revealed. The results show that the absolute values of vorticity flux of the trailing side roll cells increase with increasing radius of the measured plane and rotation number. When the absolute value of vorticity flux exceeds a critical value, the merging of the trailing side roll cells appears. Moreover, when the number of the trailing side vortex pairs is even, the absolute values of vorticity flux of the leading side vortices increase along streamwise direction. Otherwise, the absolute values decrease along the streamwise direction. By the circulation analysis, this phenomenon was found to have relationship with the merging of the trailing side roll cells, and further concluded that the secondary flow field in a rotating channel has to be treated as a whole. At last,the increase of the Reynolds number was found to be able to induce the merging position moves upstream. | Ruquan YOU Kuan WEI Zhi TAO Haiwang LI Guoqiang XU | 2018 | Chinese Journal of Aeronautics2018，31，8： | 1 |
| 12 | Experimental Investigation of the Secondary Flow in a Rotating Smooth Channel Subjected to Thermal Boundary Conditions显示文摘In the current study,thermal boundary conditions are considered in a rotating smooth channel with a square cross-section to investigate the secondary flow and compare it to that of the same channel without heating.The measurement is conducted at three streamwise planes(X=445 mm,525 mm,605 mm).The flow parameters are the Reynolds number(Re=4750,which was based on the average longitudinal or primary velocity U and the hydraulic diameter D of the channel cross-section),the rotation number(Ro=?D/U,where?is the rotational velocity,ranging from 0 to 0.26),and the aspect ratio of the channel cross-section(AR=1,which is calculated by dividing the channel height by the channel width).The leading and trailing walls are heated under a constant heat flux qw=380 W/m^2,and the top and bottom walls are isothermal at room temperature.This work is in a series with our previous work without thermal boundary conditions.Based on the experimental data,we obtained a four-vortex regime.There is a counter-rotating vortex pair near the leading side and the trailing side.Because the leading and trailing walls are heated,the buoyancy force increases the relative vertical position of the vortex pair near the trailing side from 5%to 12.5%of the hydraulic diameter.When moving upstream along the streamwise direction,the upper vortex near the trailing wall becomes weaker,whereas the lower vortex becomes stronger.As the rotational speed increases,the vortex pair near the trailing side is inhibited by the Coriolis force.Under heated thermal boundary conditions,the vortex pair near the trailing side reappears due to the effect of buoyancy force.These results indicate that the buoyancy force has a substantial effect on the secondary flow regime under thermal boundary conditions. | LI Haiwang YOU Haoliang YOU Ruquan TAO Zhi | 2020 | Journal of Thermal Science2020，29，6： | 1 |
| 13 | Distilling zinc for the Ming Dynasty: the tech- nology of large scale zinc production in Fengdu, southwest China显示文摘 | Zhou Wenli Martin6n-Torres M Chen Jianli Liu Haiwang Li Yanxiang | 2012 | Journal of Archaeological Science2012，39，4： | 1 |
| 14 | Sharing Economy in Local Energy Markets显示文摘With an increase in the electrification of end-use sectors,various resources on the demand side provide great flexibility potential for system operation,which also leads to problems such as the strong randomness of power consumption behavior,the low utilization rate of flexible resources,and difficulties in cost recovery.With the core idea of“access over ownership”,the concept of the sharing economy has gained substantial popularity in the local energy market in recent years.Thus,we provide an overview of the potential market design for the sharing economy in local energy markets(LEMs)and conduct a detailed review of research related to local energy sharing,enabling technologies,and potential practices.This paper can provide a useful reference and insights for the activation of demand-side flexibility potential.Hopefully,this paper can also provide novel insights into the development and further integration of the sharing economy in LEMs. | Zhaoyuan Wu Jianxiao Wang Haiwang Zhong Feng Gao Tianjiao Pu Chin-Woo Tan Xiupeng Chen Gengyin Li Huiru Zhao Ming Zhou Qing Xia | 2023 | Journal of Modern Power Systems and Clean Energy2023，11，3： | 1 |
| 15 | Atomic oxygen-resistant and transparent polyimide coatings from diphenylphosphine oxide and aromatic dianhydrides:Preparation and characterization显示文摘 | Li Zhuo Song Haiwang He Minhui | 2012 | Progress in Organic Coatings2012，75，12： | 1 |
| 16 | Experimental Study on the Film Cooling Characteristics of Three Complex Tip Structures显示文摘The turbine blades of aircrafts must be properly cooled to prevent engine failure.Thus,to investigate the influence of the tip structure on the film cooling effect,pressure-sensitive paint test technology was used to determine the adiabatic film cooling effectiveness in this study.The experiment was completed in a cascade comprising three straight blades.The effects of the blowing ratio,density ratio,tip clearance,and tip structure on film cooling efficiency were analyzed.The experimental results demonstrated that,as the blowing ratio increased,the film coverage area and film cooling efficiency increased under most experimental conditions.However,the film cooling efficiency was found to initially increase,and subsequently decrease,as the blowing ratio increased.The respective influences of the density ratio and tip clearance on the film cooling efficiency were found to be significant.The density ratio experiments revealed that a high-density ratio can result in better film coverage than the low-density-ratio air.The tip clearance experimental results indicated that a small tip clearance promotes an increase in film cooling efficiency;this is because the small tip clearance negatively affects the main stream leakage flow,which can reduce the film coverage area.Under the conditions of the Base case 2 configuration,a blowing ratio of 2.1,and a tip clearance of 0.6%h,the average film cooling efficiency of the blade tip was 0.22.Among the three blade tip structures applied in this study,Base case 2 demonstrated higher film cooling efficiency than the other two blade tip structures under the conditions of the same blowing ratio,tip clearance,and density ratio. | LIN Juqiang LI Haiwang YOU Ruquan LIU Runzhou TAO Zhi LIU Song | 2023 | Journal of Thermal Science2023，32，4： | 0 |
| 17 | An Insight of the First Community Infected COVID-19 Patient in Beijing by Imported Case: Role of Deep Learning-Assisted CT Diagnosis显示文摘In the era of coronavirus disease 2019(COVID-19)pandemic,imported COVID-19 cases pose great challenges to many countries.Chest CT examination is considered to be complementary to nucleic acid test for COVID-19 detection and diagnosis.Wie report the first community infected COVID-19 patient by an imported case in Beijing,which manifested as nodular lesions on chest CT imaging at the early stage.Deep Learning(DL)-based diagnostic systems quantitatively monitored the progress of pulmonary lesions in 6 days and timely made alert for suspected pneumonia,so that prompt medical isolation was taken.The patient was confirmed as COVID-19 case after nucleic acid test,for which the community transmission was prevented timely.The roles of DL-assisted diagnosis in helping radiologists screening suspected COVID cases were discussed. | Dasheng Li Dawei Wang Nana Wang Haiwang Xu He Huang Jianping Dong Chen Xia | 2021 | Chinese Medical Sciences Journal2021，36，1： | 0 |
| 18 | Numerical Simulation of Unidirectional Stratified Flow by Moving Particle Semi Implicit Method显示文摘Numerical simulation of stratified flow of two fluids between two infinite parallel plates using the Moving Particle Semi-implicit(MPS)method is presented.The developing process from entrance to fully development flow is captured.In the simulation,the computational domain is represented by various types of particles.Governing equations are described based on particles and their interactions.Grids are not necessary in any calculation steps of the simulation.The particle number density is implicitly required to be constant to satisfy incompressibility.The weight function is used to describe the interaction between different particles.The particle is considered to constitute the free interface if the particle number density is below a set point.Results for various combinations of density,viscosity,mass flow rates,and distance between the two parallel plates are presented.The proposed procedure is validated using the derived exact solution and the earlier numerical results from the Level-Set method.Furthermore,the evolution of the interface in the developing region is captured and compares well with the derived exact solutions in the developed region. | Shaoshan Rong Haiwang Li Martin Skote Teck Neng Wong Fei Duan | 2014 | Communications in Computational Physics2014，15，3： | 0 |
| 19 | Experimental research in rotating wedge-shaped cooling channel with multiple non-equant holes lateral inlet显示文摘The heat transfer in a novel smooth wedge-shaped cooling channel with lateral ejection of turbine blade trailing edge is experimentally investigated in both non-rotating and rotating cases.Beside the conventional inlet at the bottom of the channel, an extra coolant injection from 8 lateral non-equant holes is introduced to improve the overall heat transfer. The total mass flow rate ratio(lateral mass flow rate/total mass flow rate) varies from 0 to 1.0. The major inlet Reynolds number and rotation number respectively vary from 10000 to 20000 and from 0 to 1.16. Experimental results show that the lateral inlet decreases local bulk temperature and increases local heat transfer at the middle and the top of the static channel. In rotating cases, the lateral inlet notably improves the heat transfer at the high-radius half channel and compensates the negative effects induced by the rotation. Both intensity and uniformity of heat transfer inside the channel are enhanced while flow resistance decreases with proper mass flow rate ratio of coolant from two inlets. The most satisfactory total mass flow rate ratio is around 2/3. This new structural style of cooling channel has huge potential and provides new direction of heat transfer of turbine blade trailing edge. | Huimin ZHOU Haiwang LI Zhi TAO Hongwu DENG Meisong YANG Shuqing TIAN | 2018 | Chinese Journal of Aeronautics2018，31，3： | 0 |
| 20 | KIF3C Promotes the Malignant Progression of Lung Cancer Cells A549显示文摘Objective:To investigate the role of KIF3C gene in promoting the malignant phenotype of lung cancer cells and in regulating PI3K/AKT signaling pathway.Methods:CCK-8 and transwell assays were used to detect the changes in cell proliferation and cell migration ability after being transfected with siKIF3C,as well as the protein expression levels of PI3K,p-PI3K,AKT,and p-AKT following the downregulation of KIF3C by Western blot.Results:The CCK-8 assay showed that the proliferation/viability of lung cancer cells A549 significantly reduced after being transfected with siKIF3C gene(P<0.05);the migration ability of lung cancer cells A549 was significantly reduced after transfected with siKIF3C gene(P<0.05);the levels of p-PI3K and p-AKT proteins were downregulated after KIF3C protein knockdown(P<0.05);however,the detection of PI3K and AKT protein levels was not statistically significant.Conclusion:KIF3C may promote the proliferation and migration ability of lung cancer cells A549 through PI3K/AKT signaling pathway. | Haiwang Liu Ran Liu Meiling Hao Xing Zhao Chunhui Li | 2022 | Proceedings of Anticancer Research2022，6，6： | 0 |
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