Numerical study on the influence of high altitude environment on hydraulic mechanical performance

Asian Working Group- IAHR's Symposium on Hydraulic Machinery and Systems

Xue, B.^1 ; Zhao, Y.P.^1 ; Liao, W.L.^1 ; Li, Z.H.^1

Institute of Water Resources and Hydro-electric Engineering, Xi'An University of Technology, Xi'an

710048, China^1

关键词: Cavitation performance;    Design and operations;    Energy characteristics;    Environmental factors;    Environmental pressures;    Guiding significances;    Hydraulic mechanicals;    Pressure and temperature;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/163/1/012088/pdf
DOI  :  10.1088/1755-1315/163/1/012088

来源: IOP

【 摘 要 】

Due to the difference of performance between high altitude power station and low altitude power station, environmental factors should not be neglected in the design process of turbine in high altitude area. In order to study the influence of environmental factors on the performance of hydraulic turbine. In this paper, Francis turbine in high altitude area is taken as the object of study, numerical study in considering the variation of pressure and temperature under the condition of different working condition on the performance of the turbine, and the turbine performance without considering the environmental factors were compared, when the altitude changes, the energy characteristics, cavitation performance and the flow pattern of the unit in accordance with different environmental factors are analyzed in order to reveal the influence of altitude factors on the overall performance of the turbine. The results show that when the water temperature drops, the efficiency of the unit decreases and the cavitation coefficient decreases, when the environmental pressure decreases, the efficiency of the unit increases and the cavitation coefficient increases, when considering the combined effects of temperature and pressure, the efficiency of the unit decreases at high altitude compared with the conventional condition. The results of this study will be of guiding significance to the design and operation of turbines at high altitude.