郑源,蒋文青,陈宇杰,孙奥冉.贯流式水轮机低频脉动及尾水管涡带特性研究[J].农业机械学报,2018,49(4):165-171.
ZHENG Yuan,JIANG Wenqing,CHEN Yujie,SUN Aoran.Investigation on Low Frequency Pulsating and Draft Tube Vortex of Tubular Turbine[J].Transactions of the Chinese Society for Agricultural Machinery,2018,49(4):165-171.
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贯流式水轮机低频脉动及尾水管涡带特性研究   [下载全文]
Investigation on Low Frequency Pulsating and Draft Tube Vortex of Tubular Turbine   [Download Pdf][in English]
投稿时间:2017-06-12  
DOI:10.6041/j.issn.1000-1298.2018.04.019
中文关键词:  贯流式水轮机  尾水管  低频压力脉动  涡带特性  数值计算
基金项目:国家自然科学基金项目(51339005、51579080)和安徽省自然科学基金面上项目(1608085ME119)
作者单位
郑源 河海大学 
蒋文青 河海大学 
陈宇杰 河海大学 
孙奥冉 河海大学 
中文摘要:为了研究贯流式水轮机内部低频压力脉动特性,针对某电站贯流式水轮机进行了非定常数值计算,分析了不同工况下水轮机内部的压力脉动特性,揭示了贯流式水轮机低频压力脉动产生的机理,并提出了改善低频脉动的方案。研究表明,在额定工况和小流量工况下,水轮机内部的压力脉动主要受到叶片通过频率(5.26Hz)以及低频脉动(0.20Hz)的影响,低频脉动的幅值从水轮机进口到出口逐渐增加,且小流量工况的低频压力幅值较额定工况高;不同工况下,水轮机尾水管内均存在一个与转轮旋转方向一致的螺旋状偏心涡带,该涡带按一定周期演变,其对应频率为0.22Hz,与低频压力脉动频率(0.20Hz)较为接近,因此可以说明该水轮机内部的低频压力脉动是尾水管涡带引起的;为了减小水轮机低频压力脉动系数幅值,提出了一种在尾水管内增设导流板的方案,该方案能有效降低由尾水管涡带引起的低频压力脉动系数幅值,导流板通过降低尾水管内的涡带能量,达到消涡目的。研究结果可为贯流式水轮机组的稳定运行提供依据。
ZHENG Yuan  JIANG Wenqing  CHEN Yujie  SUN Aoran
Hohai University,Hohai University,Hohai University and Hohai University
Key Words:tubular turbine  draft tube  low-frequency pressure-pulse  vortex characteristic  numerical calculation
Abstract:In order to study the characteristics of low frequency pressure pulsation of tubular turbine, the unsteady internal flow field in a tubular turbine of a power station was numerically simulated. The pressure pulsation characteristics of the turbine under different working conditions were also analyzed. The UG software was used to build the model which mainly consisted of inlet conduit, bulb body, guide vane, runner and draft tube. The results showed that the pressure pulsation in the turbine was mainly affected by the rotation frequency of blade (5.26Hz) and the low-frequency pressure-pulse (0.20Hz) under the rated condition and low flow rate condition. The amplitude of the low frequency pulsation at 0.20Hz was increased gradually from the turbine inlet to the outlet. And the amplitude under the low flow rate condition was higher than that of the rated condition. There was a helical vortex rope in the draft tube which had the same direction with the runner hand of rotation. The frequency of the vortex rope in the draft tube was 0.22Hz. The low frequency pressure fluctuation frequency was mainly caused by the vortex rope. In order to reduce the influence of vortex rope, the deflector was used in the draft tube. The vortex was eliminated by reducing the energy of vortex. The steady operation of the turbine has been the focus in recent years. At the same time, the low-frequency pressure-pulse in the turbine was an important factor which affected the stable operation of the turbine. The research result had reference value for the stable operation of tubular turbine.

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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