A LINEAR FLOW RESISTANCE MODEL OF A MULTI -GOVERNING STEAM VALVE SYSTEM USING COMPUTATIONAL FLUID DYNAMICS

作者：Wang, Peng; Liu, Yingzheng^*; He, Jin; Xu, Sihua

来源：ASME Pressure Vessels and Piping Conference, Canada, 2016-07-17 to 2016-07-21.

• Multi-governing valve system
• Pressure drop
• Flow rate
• Opening ratio
• Computational fluid dynamics

A linear flow resistance model (LFRM) of multi-governing valve system performance was built using computational fluid dynamics to determine the distribution of flow rate through all parallel-placed steam valves at different opening ratios. A four valve configuration connected to a water-feed pump turbine was systematically separated into three sections: valve chambers, diffuser passages and governing stages. The steam flow through each individual section was computationally modeled, and revealed that pressure drops were dependent on the flow rate. A numerical simulation strategy based on shear stress transport (SST) turbulence modeling was validated by the experimental measurements from a single valve test rig, which showed favorable agreement with the measured pressure drop at different flow rates. Subsequently, an LFRM was built to consider the geometric topology. Here, the pressure drop's dependency on the flow rate along each section in an individual valve passage was regarded as a transfer function module. A performance map of the multi-governing valve system was obtained to predict the flow rate distribution under the opening conditions of different valves. Finally, the three-dimensional steam flow of the full multi-governing-valve system was numerically simulated to obtain the steam flow rate through different valves, and found to be in good agreement with the prediction gained using the LFRM. The proposed model can potentially be used in planning operation control strategies.

• 出版日期2017
• 单位上海交通大学