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01.07.2017 | Original Article | Ausgabe 4/2017

Chinese Journal of Mechanical Engineering 4/2017

Experimental Investigation of Inter-Blade Vortices in a Model Francis Turbine

Zeitschrift:
Chinese Journal of Mechanical Engineering > Ausgabe 4/2017
Autoren:
Demin LIU, Xiaobing LIU, Yongzhi ZHAO
Wichtige Hinweise
Supported by National Natural Science Foundation of China (Grant No. 51279172), Open Research Subject of Key Laboratory of Fluid Machinery of Ministry of Education, Xihua University, China (Grant No. szjj2015-022), and Key Laboratory of Natural Science Fund of Education Department of Sichuan Province, China (Grant No. 080704).

Abstract

The inter-blade vortex in a Francis turbine becomes one of the main hydraulic factors that are likely to cause blade erosion at deep part load operating conditions. However, the causes and the mechanism of inter-blade vortex are still under investigation according to present researches. Thus the causes of inter-blade vortex and the effect of different hydraulic parameters on the inter-blade vortex are investigated experimentally. The whole life cycle of the inter-blade vortex is observed by a high speed camera. The test results illustrate the whole life cycle of the inter-blade vortex from generation to separation and even to fading. It is observed that the inter-blade vortex becomes stronger with the decreasing of flow and head, which leads to pressure fluctuation. Meanwhile, the pressure fluctuations in the vane-less area and the draft tube section become stronger when inter-blade vortices exist in the blade channel. The turbine will be damaged if operating in the inter-blade vortex zone, so its operating range must be far away from that zone. This paper reveals the main cause of the inter-blade vortex which is the larger incidence angle between the inflow angle and the blade angle on the leading edge of the runner at deep part load operating conditions.

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