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THE ESTIMATION OF EVAPOTRANSPIRATION OF WHEAT FIELD-AN IMPROVED ENERGY-aerodynamic resistance MODEL

Journal of Geographical Sciences 1991年第2期 82-92页

作者： Xie Xianqun Institute of Geography CAS

Thc rac term in the energy balance-aerodynamic resistance model introduced by Monteith and Hatfield applies only under certain conditions.Under unstable conditions,it results in large errors.An attempt to improve the ... 详细信息

关键词： evapotranspiration energy balance aerodynamic resistance

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aerodynamic Design of a Subsonic Evacuated Tube Train System

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Fluid Dynamics & Materials Processing 2020年第1期16卷 121-130页

作者： Tian Li Xiaohan Zhang Yao Jiang Weihua Zhang State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu610031China China Railway Eryuan Engineering Group Co. Ltd.Chengdu610031China

The so-called Evacuated Tube Train(ETT)is currently being proposed as a high-speed transportation system potentially competitive with airplane transportation.aerodynamic resistance is one of the most crucial factors for the successful design of an ETT.In the present work,a three-dimensional concept ETT model has been elaborated.The aerodynamic characteristics of the subsonic ETT have been numerically simulated under different conditions.The train’s running speed varies from 600 km/h up to 1200 km/h,and the blockage ratio is in the range between 0.1 and 0.3.As the blocking ratio and running speed increase,the resistance of the head car increases greatly,while the resistance of the middle car changes slightly.The aerodynamic resistance of the tail car is affected by the shock wave emerging in the wake flow.Two different design criteria for the maximum allowed aerodynamic resistance are proposed for aerodynamic parameter matching.With an increase in the blockage ratio and running speed,the atmospheric pressure in the tube should be decreased to achieve a balance.

关键词： Evacuated tube train aerodynamic resistance blockage ratio shock wave

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Theoretical Justification of the Efficient Operation of the Seed Sorting Device

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工程(英文)(1947-3931) 2023年第10期15卷 720-728页

作者： Obidov Avazbek Azamatovich Abdullayev Abror Abdulkhamid Ugli Department of Technological Machines and Equipment Namangan Institute of Engineering and Technology Namangan Uzbekistan

In this article, the results of researches on the sorting of seeds in the cotton ginning enterprises were described. The main goal of the research work is to theoretically study the technology of separating various impurities and immature seeds from the composition of seeds. As a result, the theoretical basis for increasing the efficiency of the sorting process is created.

关键词： Cotton Ginning Seed Seeds Construction Parameter Seed Sorting Forces aerodynamic resistance Air Motion

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