多级液力透平叶轮和导叶内非定常压力脉动研究

兰州理工大学学报 ›› 2025, Vol. 51 ›› Issue (1): 55-65.

多级液力透平叶轮和导叶内非定常压力脉动研究

苗森春^*1, 田旺龙^1,2

1.兰州理工大学能源与动力工程学院, 甘肃兰州 730050;
2.甘肃银光化学工业集团有限公司, 甘肃白银 730900

收稿日期:2022-12-16 出版日期:2025-02-28 发布日期:2025-03-03
通讯作者: 苗森春(1986-),男,甘肃环县人,博士,副教授.Email:miaosc88@126.com
基金资助:
国家自然科学基金(52169019),甘肃省自然科学基金(20JR10RA203)

Study of unsteady pressure pulsation in multistage-pump as turbine impeller and guide vane

MIAO Sen-chun¹, TIAN Wang-long^1,2

1. College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
2. Gansu Yinguang Chemical Industry Group Co. Ltd., Baiyin 730900, China

Received:2022-12-16 Online:2025-02-28 Published:2025-03-03

摘要/Abstract

摘要： 在运行过程中压力脉动是影响多级液力透平稳定运行的关键因素之一.为了研究多级液力透平内部的压力脉动规律,选用RNG k-ε湍流模型进行非定常数值计算,通过在各级过流部件内设置不同的监测点,得到各过流部件的压力脉动数据,并对其进行时域和频域分析.结果表明:叶轮内压力脉动的主频与叶轮的转频密切相关;在最优工况下,叶轮与正导叶之间的动静干涉是引起叶轮内压力脉动的主要原因;在其他流量工况下,叶轮与正导叶之间的动静干涉、叶轮内流动不稳定是导致叶轮内监测点压力脉动增大的主要原因;各级正导叶的主频与叶轮的叶频密切有关,且正导叶的主频等于叶轮的叶频,沿着正导叶的流道越靠近叶轮压力脉动越大;反导叶内压力脉动比较紊乱,没有明显的变化规律.

关键词: 多级液力透平, 压力脉动, 数值模拟, 动静干涉

Abstract: During the operation process of a multistage-pump as turbine, the pressure pulsation is one of the key factors affecting the stability of the unit. In order to investigate the regularity of pressure pulsation in this turbine, in this paper, the turbulence model of RNG k-ε is selected to carry out the unsteady numerical calculation. Both the time domain and frequency domain of pressure pulsation are analyzed by the data of pressure pulsation got from the monitoring points distributed in the various each-stages flow components. The results exhibited that the main frequency of pressure pulsation is mainly related to the rotation frequency of the impeller. Upon the optimal operation condition, the rotor-stator interaction between the impeller and the positive guide vanes is considered as the main reason for the pressure pulsation in the impeller. It is the combination effect of both the phenomenon of unstable flow in the impeller and the rotor-stator interaction between the impeller and the positive guide vanes on the increase of pressure pulsation at the monitoring points in the guide impeller under the other flow conditions. Additionally, the main frequency of the positive guide vanes at all levels is closely related to the blade frequency of the impeller, as well as the main frequency of the positive guide vanes is consistent with that of the impeller. The closer the flow passage along the positive guide vane is to the impeller, the greater the pressure pulsation is. Finally, the pressure pulsation in the anti-guide vanes presents a relatively disordered state, showing no obvious change rule.

Key words: multistage-pump as turbine, pressure pulsation, numerical simulation, static interference

中图分类号:

TH311

苗森春, 田旺龙. 多级液力透平叶轮和导叶内非定常压力脉动研究[J]. 兰州理工大学学报, 2025, 51(1): 55-65.

MIAO Sen-chun, TIAN Wang-long. Study of unsteady pressure pulsation in multistage-pump as turbine impeller and guide vane[J]. Journal of Lanzhou University of Technology, 2025, 51(1): 55-65.

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