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| Transient simulation of turbine jointed with diversion penstock |
| FAN Hong-Gang, Huang-Wei-De, Chen-Nai-Xiang |
(State key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China) |
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Abstract With consideration of the influence of transient flow in pipe during a transition of operation condition, a coupled calculation model for the transient flow in a pipe and threedimensional unsteady flow in a turbine was developed in this paper. The transient flow in pipe was calculated by the characteristic method and the unsteady flow in the turbine was calculated by the finite volume method for threedimension incompressible flows. A coupled iteration was carried on at the interface between the pipe and the turbine based on the continuity of flow and the balance of total pressure of water. Three methods, including coupled calculation method, traditional transient simulation method and traditional threedimensional flow calculation method, were used to simulate the loadrejection transient process of a hydraulic turbine with diversion penstock. The results showed that the trends of pressure, flow of unit and rotational speed, etc, are consistent in all three methods. However, because the reflection and superposition of water hammer wave is considered in the coupled calculation method, the increase in water hammer pressure at the spiral inlet is higher and the pressure fluctuation in the turbine is stronger, suggesting the method can reflect the interaction between transient flow in the pipe and threedimension unsteady flow in the turbine more realistically.
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Received: 17 May 2012
Published: 30 November 2012
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