von Karman脱落频率对额定负荷下混流式水轮机水动力特性的影响

IF 1.3 Q2 ENGINEERING, AEROSPACE
Giacomo Zanetti, G. Cavazzini, A. Santolin
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引用次数: 0

摘要

本文对新近安装的小型水力混流式水轮机在接近额定负荷运行时,叶片尾缘的冯·卡门涡脱落对水轮机水动力特性的影响进行了数值分析。提出了一种简化的单通道数值模型,以减少模拟的计算量,同时保证流体流动评估的准确性。通过比较实验获得的声频频谱和数值压力信号的频谱,研究了所提出的数值方法的准确性,确认了机器振动的性质。验证的数值模型为在初步设计阶段深入分析机器的流体力学提供了有用的工具。该方法是一种有效的替代传统的基于相关性的方法来评估冯·卡门脱落频率,与整个机器的瞬态模拟相比,计算量更少。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of the von Karman Shedding Frequency on the Hydrodynamics of a Francis Turbine Operating at Nominal Load
This paper presents a numerical analysis of the influence of the von Karman vortex shedding at the blade trailing edge on the hydrodynamics of a recently installed small hydro Francis turbine manifesting very loud and high-frequency acoustic pulsations when operating close to the nominal load. A reduced single-passage numerical model is developed to reduce the computational effort of the simulation while ensuring high accuracy in the assessment of fluid flow. The accuracy of the proposed numerical approach is investigated by comparing the frequency spectrum of the experimentally acquired acoustic frequency and the numerical pressure signals, confirming the nature of the machine’s vibrations. The validated numerical model represents a useful tool for an in-depth analysis of the machine’s hydrodynamics in the preliminary design phases. The proposed approach represents a valid alternative to the traditional correlation-based approach for the evaluation of the von Karman shedding frequency with less computational effort compared with a transient simulation of the entire machine.
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来源期刊
CiteScore
2.30
自引率
21.40%
发文量
29
审稿时长
11 weeks
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