Analysis of Off-Design Flow Field and Prediction of Performance in Hydraulic Turbine

Abstract:

Two models of hydraulic turbine based on pump in reversal were simulated. Pressure distribution of flow field in Variable conditions was analysed and external characteristic was forecasted for hydraulic turbine. It was shown: the head increased with flow increased, with increasing of flow rate, efficiency first increased and then decreased. Compared with the turbine with a guide vane, the head of two models was almost equal, but the disparity of efficiency was large, and the efficiency of hydraulic turbine with a guide vane above on the efficiency of hydraulic turbine without guide vane. Pressure pulsation was existent in runner inlet. From runner inlet to runner outlet, the pressure distributed evenly from high to low. Added with a guide vane, the pressure distribution was more evenly than before and the Amplitude of pressure fluctuation decreased.

• Periodical: Applied Mechanics and Materials (Volumes 496-500)
• Pages: 877-880
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.496-500.877
• Online since: January 2014
• Authors: Feng Xia Shi*, Jun Hu Yang, Xiao Hui Wang
• Keywords: External Characteristic, Flow Field, Hydraulic Turbine, Numerical Simulation, Off-Design

References

[1] Shahram Derakhshan*, Ahmad Nourbakhsh. Theoretical, numerical and experimental investigation of centrifugal pumps in reverse operation[J]. Experimental Thermal and Fluid Science 32 (2008) pp.1620-1627.

DOI: 10.1016/j.expthermflusci.2008.05.004

[2] YANG Jun hu，YUAN Ya fei. ect . Performance predictions of reversed centrifugal pumps working as energy recovery turbines . Journal of Lanzhou University of Technology. Vol 36 (2010), pp.54-56.

[3] Gong Shi Hong. Type selection for pump operating as hydroturbine. Small Hydropower, 1989（5）：pp.25-27.

[4] H.J. van Antwerpen*, G.P. Greyvenstein. Use of turbines for simultaneous pressure regulation and recovery in secondary cooling water systems in deep mines[J]. Energy Conversion and Management 46 (2005) p.563.

DOI: 10.1016/j.enconman.2004.04.006

[5] F X Shi, J H Yang . etc. The impact of inlet angle and outlet angle of guide vane on pump in reversal based hydraulic turbine performance. IOP: Conf. Series: Earth and Environmental Science 15(2012) 042030.

DOI: 10.1088/1755-1315/15/4/042030

[6] G Ventrone*, G Ardizzon, G Pavesi. Direct and reverse flow conditions in radial flow hydraulic turbomachines. Proc Instn Mech Engrs . 2000. 214，Part A ，pp.635-644.

DOI: 10.1243/0957650001538155