低水头混流式水轮机部分负荷运行时的外围空气喷射

SANDEEP KUMAR, BHUPENDRA K GANDHI
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引用次数: 0

摘要

混流式水轮机在部分负荷(PL)运行时,流场中的旋转涡绳会产生低频、高振幅脉动。这些高振幅压力脉动会导致功率波动、周期性疲劳、严重的结构振动、牵伸管激增以及水轮机部件的机械故障。通常采用注入流体的方法来抑制或减轻这些低频压力脉动。在本研究中,空气注入量为 PL 处涡轮流量的 0.5% 至 2.5%。为适应空气喷射机制,对通风管(DT)锥体进行了修改。为进行详细研究,对压力数据进行了频谱分析和空间谐波分解(SHD)。通过空间谐波分解,可以获得 DT 锥体中压力脉动的同步波动(柱塞分量)和异步波动(旋转分量)。在 DT 锥体中注入空气可成功抑制高振幅的低频脉动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Peripheral air jet injection at part load operation of a low head Francis turbine

Peripheral air jet injection at part load operation of a low head Francis turbine

The rotating vortex rope in the flow field generates low-frequency, high-amplitude pulsations at part load (PL) operation of a Francis turbine. These high amplitude pressure pulsations are responsible for power swing, cyclic fatigue, heavy structural vibrations, draft tube surge, and mechanical failure of turbine components. The fluid injection methods are generally employed to arrest or mitigate these low frequencies pressure pulsations. In the present work, the air is injected at a rate of 0.5% to 2.5% of the turbine flow rate at PL. The draft tube (DT) cone is modified to accommodate the air injection mechanism. Spectral analysis and spatial harmonic decomposition (SHD) are performed on pressure data for detailed investigation. The SHD is performed to get the synchronous (plunging component) and asynchronous fluctuations (rotating component) of pressure pulsations in the DT cone. The air injection in the DT cone successfully arrested the low-frequency pulsations of high amplitudes.

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