Abstract—One of the main contributions that affect the efficiency of a turbine system is due to the pressure loss through the flow control valves. In this project a three valves system, which includes a stop valve and two governing valves connected by pipes between the boiler and the turbine, has been analysed using a three-dimensional Computational Fluid Dynamics (CFD) model. The main aim is to understand the complex flow through this complex configuration system under different operation conditions, so as to derive the necessary information for optimising the valve designs and the efficient operations of the whole turbine system. Three turbulence models are employed to perform the simulations and detailed results such as the pressure field, velocity field and distributions of the turbulence quantities are carefully analysed. It is found that the standard k- model has produced the best predictions for this flow system. For the pressure loss analysis approximate calculations in each part of the valve system have also been carried out using simplified pressure loss models to testify the simulation results. The comparisons between the approximated loss coefficients and the predicted CFD results have shown reasonable agreements.
Index Terms—CFD, pressure loss, turbine system, turbulent flow, valve.
X. Du and S. Gao are with the Department of Engineering, University of Leicester, Leicester, LE1 7RH, UK (e-mail: sg32@le.ac.uk)
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Cite:X. Du and S. Gao, "Numerical Study of Complex Turbulent Flow through Valves in a Steam Turbine System," International Journal of Materials, Mechanics and Manufacturing vol. 1, no. 3, pp. 301-305, 2013.
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