张兰金,王正伟,常近时.混流式水泵水轮机全特性曲线S形区流动特性[J].农业机械学报,2011,42(1):39-43,73.
Zhang Lanjin,Wang Zhengwei,Chang Jinshi.Flow of Pump-turbine on S-shaped Region of Complete Characteristics[J].Transactions of the Chinese Society for Agricultural Machinery,2011,42(1):39-43,73.
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混流式水泵水轮机全特性曲线S形区流动特性   [下载全文]
Flow of Pump-turbine on S-shaped Region of Complete Characteristics   [Download Pdf][in English]
  
DOI:10.3969/j.issn.1000-1298.2011.01.009
中文关键词:  水泵水轮机  S形区  湍流模型  非定常流
基金项目:国家自然科学基金资助项目 (50879036、50879088);清华大学水沙科学与水利水电工程国家重点实验室统筹研究资助项目(2009T3)
作者单位
张兰金 华北水利水电学院 
王正伟 清华大学 
常近时 中国农业大学 
中文摘要:混流式水泵水轮机转轮的离心效应较混流式水轮机明显,形成了全特性曲线上的S形特性。该S形区水泵水轮机流道内流动状况很不稳定,为了详细了解该区域的流动特性,选取等开度下水轮机工况、水轮机飞逸工况、零流量附近水轮机制动工况、零流量附近反水泵工况以及反水泵工况等5个工况点进行全流道定常流和非定常流数值分析。定常流动分析表明:全特性曲线上的S形区转轮和导叶流道内存在大量的涡,消耗了大量的水能,致使机组输出功率很小。非定常流场计算表明:在S形过渡工况区,蜗壳与尾水管直锥段内的压力脉动频率与幅值均相近,且幅值小;而导叶至叶片的无叶区和叶片进口的压力脉动幅值高,主要为高频脉动。
Zhang Lanjin  Wang Zhengwei  Chang Jinshi
North China University of Water Resources and Electric Power;Tsinghua University;China Agricultural University
Key Words:Pump-turbine, S-shaped region, Turbulent model, Unsteady flow
Abstract:The S-shaped region of complete characteristics on pump-turbine is caused by centrifugal force larger than common hydraulic turbine. The flow on that S-shaped region is very much unsteady. In order to obtain the flow on that region, the steady and unsteady simulations were analyzed on turbine, turbine runaway, turbine brake near no-discharge, anti-pump near no-discharge and anti-pump operation conditions which run on S-shaped curve. The results showed that much large eddy existed in vanes and runner. That eddy wasted much water energy and reduced turbine output. Through the unsteady simulation of S-shaped curve, it is found that the pressure pulsation frequency and amplitude in spiral casing and cone of draft tube are similar and the amplitude is small. The pressure pulsation amplitude on guide vanes and blade inlet are high, and those frequencies are also high. Those simulations are always used to know the essence of S-shaped region and reduce the unsteady characteristics. 

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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