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| 1 | Effects of End-Bend and Curved Blades on the Flow Field and Loss of a Compressor Linear Cascade in the Design Condition显示文摘Curved blade and end-bend blade are considered as effective passive control methods for improving the aerodynamic performance of a compressor cascade,and their applicability also needs to be further studied.A highly-loaded compressor linear cascade in the design condition was taken as the research objective in this paper.Numerical simulation was used to study the positive and negative effects of these methods on the flow loss of the cascade by redistributing the vortex structures.Results show that:the curved blade could reduce the flow loss to 2.55%,while the end-bend blade and the end-bend+curved blade increase it to 10.58%and 2.19%,respectively.The positive effect of the curved blade weakens the strength and scale of Concentrated Shedding Vortex(CSV),which accounts for 59.2%of the total flow loss.The negative effect of the end-bend blade exacerbates the low-energy fluid clusters from the end wall and wake into CSV.Finally,the end-bend+curved blade can take their own strengths,but it enhances the twisting motion of Passage Vortex(PV)and CSV,which makes it fail to reduce the flow loss.Therefore,the positive and negative effects of these methods on the flow loss of a compressor cascade are much clearer.In addition,we also predict the potential danger of the end-bend blade in the negative incidence conditions and provides some suggestion for future study. | KAN Xiaoxu WU Wanyang YANG Ling ZHONG Jingjun | 2019 | Journal of Thermal Science2019，28，4： | 4 |
| 2 | Research Progress of Tip Winglet Technology in Compressor显示文摘In the present study,the research progress of tip winglets that control tip clearance leakage flow in compressors is reviewed.Firstly,the effects of tip leakage flow on the aerodynamic performance of the compressor are presented.Subsequently,the development of tip winglet technology is reviewed.Next,a series of studies on compressor tip winglet technology are conducted.Besides,the effects of tip winglets on the aerodynamic performance of rectangular cascades of low-speed and high-subsonic compressors,subsonic compressor rotor and transonic compressor rotor are discussed,respectively,and the control effect of tip winglet technology combined with tip groove design on tip leakage is investigated.Lastly,the subsequent development direction and research prospect of compressor tip winglet technology are presented. | ZHONG Jingjun WU Wanyang HAN Shaobing | 2021 | Journal of Thermal Science2021，30，1： | 2 |
| 3 | 利用条件自回归模型对宏观状态下的自行车碰撞事件进行空间分析显示文摘根据美国国家公路交通安全管理局(the nation-al highway traffic safety administration,NHTSA)资料显示,目前美国的自行车通勤量增加了60%以上。然而,近年来骑自行车者的安全风险也呈上升趋势。佛罗里达州2015年自行车事故死亡人数为150人,是2010年的1.8倍。总的来说,佛罗里达州在2010—2015年期间以755起行车死亡案例数居全美前列。这些严峻的统计数据强调需要对佛罗里达州的自行车碰撞事故进行深入调查分析[1]。 | 何晓艺 李丽萍 Dibakar Saha Priyanka Alluri Albert Gan Wanyang Wu | 2018 | 伤害医学(电子版)2018，7，4： | 0 |
| 4 | Research on Calculation Method of Aerodynamic Parameters of Supersonic Probe Based on Gas Compressibility Factor显示文摘The supersonic multi-hole probe is an essential test tool for wind tunnel experiments, which is necessary to develop the basic research of improving the measurement accuracy and expanding the application of the probes. | ZHONG Jingjun HUANG Gangfeng WU Wanyang KAN Xiaoxu | 2022 | Journal of Thermal Science2022，31，1： | 0 |
| 5 | Variable Clearance Characteristics of High Subsonic Compressor Cascades with Blade Tip Winglets显示文摘The gas turbine is the main power equipment for naval ship and special civil ship,while the compressor is one of the core structures of the gas turbine.The existing tip clearance could prevent the compressor blade and casing collision.Therefore,the flow loss in the tip region caused by the tip clearance will degrade the performance of the compressor.To improve the variable clearance characteristics of the high subsonic compressor cascades,the cascades with tip clearances of 1%,2%and 3%chord length are studied through experimental measurements and numerical calculations.The research results prove that the pressure surface tip winglet can cause a significant improvement effect under most working conditions.If the blade tip clearance size is gradually increasing within a reasonable range,the improvement effect becomes more remarkable,and the optimal tip winglet case changes.When tip clearance is 1%chord length,the PTW1.0 case(the width of the pressure surface tip winglet is 1.0 time of the original tip)reduces the flow loss by 3.09%compared with the NTW case(No Tip Winglet).When tip clearance is 2%chord length,the flow loss of PTW1.5 case(the width of the pressure surface tip winglet is 1.5 times of the original tip)is reduced by 3.46%.When tip clearance is 3%chord length,all alternative tip winglets reduce the total pressure loss,and PTW2.0 case(the width of the pressure surface tip winglet is 2.0 times of the original tip)is the best choice,which has a 6.53%degree of improvement. | WU Wanyang ZHONG Jingjun | 2022 | Journal of Thermal Science2022，31，2： | 0 |
| 6 | Attosecond Delays of High-Harmonic Emissions from Hydrogen Isotopes Measured by XUV Interferometer显示文摘High-harmonic spectroscopy can access structural and dynamical information on molecular systems encoded in the amplitude and phase of high-harmonic generation(HHG)signals.However,measurement of the harmonic phase is a daunting task.Here,we present a precise measurement of HHG phase difference between two isotopes of molecular hydrogen using the advanced extreme-ultraviolet(XUV)Gouy phase interferometer.The measured phase difference is about 200 mrad,corresponding to~3 attoseconds(1 as=10−18 s)time delay which is nearly independent of harmonic order.The measurements agree very well with numerical calculations of a four-dimensional time-dependent Schödinger equation.Numerical simulations also reveal the effects of molecular orientation and intramolecular two-center interference on the measured phase difference.This technique opens a new avenue for measuring the phase of harmonic emission for different atoms and molecules.Together with isomeric or isotopic comparisons,it also enables the observation of subtle effects of molecular structures and nuclear motion on electron dynamics in strong laser fields. | Mumta Hena Mustary Liang Xu Wanyang Wu Nida Haram Dane E.laban Han Xu Feng He R.T.Sang Igor V.Litvinyuk | 2022 | Ultrafast Science2022，，5： | 0 |
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