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| 1 | Spatio-temporal distribution of gaseous pollutants from multiple sources in industrial buildings with different flow patterns显示文摘Energy consumption of industrial buildings has remained continuously high,and the environmental quality requirements are also constantly improving.Only by improving industrial environmental control technology based on the transport mechanism of the pollution,can the energy consumption of industrial building environmental control be further reduced,and the environmental quality of industrial buildings can be improved as well.Therefore,after verifying the numerical simulation by experiments,this study uses a self-label method to investigate the spatio-temporal distribution of gaseous pollutants from multiple time-series sources in industrial plants with different length-span ratios.The results show that,the polluted flow in plants with different aspect ratios have different flow patterns:(i)the,,Back-mixingw flow pattern occurs when the ratio of ventilation rate 6 and polluted flow rate at the exhaust height b is less than 1,i.e.,G/L_(p)<1,and(ii)the'One-way'flow pattern occurs when G/L_(p)>1.For plants with the'Back-mixing'pattern,the following source pollutants enter a density stratified environment induced by the retained pre-source pollutants.The flow of following source pollutants released at the same intensity as the precursor source can reach the roof,while those with low velocity and density difference may be blocked during the ascending process.The maximum height zm of the flow of the following source is related to both the initial Froude number Fr_(o)of the following source and the unsteady vertical density gradient of the fluid in the indoor environment dpa/dz.For plants with the,,One-way,/pattern,the flow from the following source enters into an environment with approximately uniform density.Under the condition of positive buoyancy,design parameters of ventilation corresponding to the vicinity of G/L_(p)=1 may be the optimal solution for safety and energy conservation. | Yingxue Cao Yi Wang Zhuolei Yu Caiwu Lu Songheng Wu Yang Yang Xiaojing Meng | 2022 | Building Simulation2022，15，9： | 1 |
| 2 | Gas–liquid two-phase flow splitting at microchannel junctions with different branch angles显示文摘 | Jinfang Chen Shuangfeng Wang Hongfeng Ke Songheng Cai Ying Zhao | 2013 | Chemical Engineering Science2013，，： | 1 |
| 3 | Performance of novel overhead crane fume-collecting hood for pollutant removal显示文摘In industrial buildings,the presence of overhead cranes severely affects roof exhaust ventilation systems when capturing and discharging fumes,resulting in severe deterioration of the indoor plant environment.In this study,an overhead crane-based ventilation auxiliary device,called overhead crane fume-collecting hood(CFCH),is proposed to guide pollutants blocked by the overhead crane back to the roof exhaust hood.The airflow characteristics and pollutant distribution under the three modes of no overhead crane,overhead crane,and overhead crane+CFCH were compared using numerical simulations.Subsequently,the effects of the CFCH length(a),width(b),and height(h)on the pollutant capture performance were determined through orthogonal experiments and computational fluid dynamics.Finally,the pollutant capture efficiency(PCE)of the optimal CFCH was investigated considering different exhaust airflow rates.The results showed that the pollutants captured by the CFCH can be classified into directly and secondary captured pollutants,with the directly captured pollutants dominating.In addition,with the introduction of different sizes of CFCH around the overhead crane girders,the PCE significantly improved by 49.9%–74.6%.The length,width,and height of the CFCH on the PCE were statistically significant,and the priority of the three factors was as follows:h>b>a.The PCE decreased with increasing a,initially increased and then decreased with increasing b,and increased with h.Subsequently,when the optimal CFCH was used,the excessive exhaust air rate had no evident PCE improvement.This provides a new concept for the control of pollutants in industrial buildings and provides a theoretical basis for the design of CFCHs. | Zhixiang Cao Pan Xiao Yi Wang Yuqing Bai Chen Zhang Tongtong Zhao Chao Zhai Minghao Zhang Songheng Wu | 2023 | Building Simulation2023，16，7： | 0 |
| 4 | Blind restoration of turbulence degraded images based on two-channel alternating minimization algorithm显示文摘Due to the atmospheric turbulence and the system noise, images are blurred in the astronomical or space object detection. Wavefront aberrations and system noise make the capability of detecting objects decrease greatly. A two-channel image restoration method based on alternating minimization is proposed to restore the turbulence degraded images. The images at different times are regarded as separate channels, then the object and the point spread function(PSF) are reconstructed in an alternative way. There are two optimization parameters in the algorithm: the object and the PSF. Each optimization step is transformed into a constraint problem by variable splitting and processed by the augmented Lagrangian method. The results of simulation and actual experiment verify that the two-channel image restoration method can always converge rapidly within five iterations, and values of normalized root mean square error(NRMSE) remain below 3% after five iterations. Standard deviation data show that optimized alternating minimization(OAM) has strong stability and adaptability to different turbulent levels and noise levels. Restored images are approximate to the ideal imaging by visual assessment, even though atmospheric turbulence and systemnoise have a strong impact on imaging. Additionally, the method can remove noise effectively during the process of image restoration. | YANG Huizhen LI Songheng LI Xin ZHANG Zhiguang YANG Haibo LIU Jinlong | 2022 | Optoelectronics Letters2022，18，2： | 0 |
| 5 | Analysis and optimization of batteries powering inductive pulsed power supplies显示文摘Inductive pulsed power supply(IPPS)is a promising type of power supplies for electromagnetic launch,but its advantage in energy density is strongly restricted by the primary power source.Fortunately,batteries become a suitable and practical choice for the primary source.In this paper,the working process of battery powering IPPS is analysed in detail.Various indicators of the charging performance are calculated,which are then proved to be irrelevant to most of the parameters of IPPS.Based on this,an optimization method for battery and IPPS system is proposed,in which the charging and discharging processes can be decoupled.And for the decoupled battery charging process,the bi-objective optimization model is suggested.Several examples illustrate the feasibility and effectiveness of the proposed optimization methods.In order to further improve the performance of the battery and IPPS system,the inherent time constant of the inductors and the output power density of the battery cell should be increased. | Hao Sun Xinjie Yu Zhen Li Bei Li Zhizhen Liu Songheng Yang Hongzhuang He | 2023 | High Voltage2023，8，1： | 0 |
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