Numerical Simulation and Analyses of Flow Rate Exchange between Accumulator and Main loop

Abstract

In order to study the dynamic behaviors of heat and mass transfer between accumulator and mechanically pumped two–phase loop (MPTL) system, a transient numerical model is developed by using thetime–dependent Navier–Stokes equations. By comparison between simulation and test results, it is found that the error of numerical model is in the range of ±10%, which verifies the validityand accuracy of the model. Simulation results show that the accumulator will exchange fluid with the main loop in responseto heat load variations. In this case, the temperature and pressure of two phase fluid in accumulator, and the total system flow resistance will be affected. The rate of mass transferbetween accumulator and main loop will increase along with the charge amount of working fluid, and also for the variation trend of temperature and pressure of two phase fluid in the accumulator. The model can be used to study the operating state, flow and heat characteristics of MPTL system.