Open Access

ARTICLE

Influence of Different Transition Modes on the Performances of a Hydraulic Turbine

Fengxia Shi^1,2, Yucai Tang^1,*, Dedong Ma¹, Xiangyun Shi¹, Guangbiao Zhao¹

1 School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, 730050, China
2 Key Laboratory of Fluid Machinery and Systems of Gansu, Lanzhou, 730050, China

* Corresponding Author: Yucai Tang. Email:

Fluid Dynamics & Materials Processing 2023, 19(10), 2481-2497. https://doi.org/10.32604/fdmp.2023.028416

Received 04 January 2023; Accepted 05 May 2023; Issue published 25 June 2023

Abstract

In order to analyze the response of a hydraulic turbine to a variation in the operating conditions, different laws of variation in time of the mass flow rate have been considered. After validating the overall numerical framework through comparison with relevant experiments, the performances of the considered turbine have been analyzed from a fluid-dynamic point of view. The results show that different time profiles of the mass flow rate (in this work, for simplicity, referred to as “transition functions”) have a varying influence on the transient behavior of the turbine. When a quadratic function is considered for the case of large flow, the transient head and torque increase gradually with time, the fluctuation amplitude of the transient hydraulic efficiency at the main frequency is the largest, and the fluctuation amplitude of the radial force is the smallest. For the small flow case, the time profile with exponential nature leads to the best results. The transient head and torque decrease gradually with time, the pulsation amplitude of the transient hydraulic efficiency is the largest at the main frequency, and the pulsation amplitude of the radial force is the smallest.

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