| Citation: | MENG Qingliang, ZHANG Huandong, ZHAO Zhenming, et al. Transient numerical simulations of flow rate into and out of two-phase temperature control accumulator[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(11): 2160-2169. doi: 10.13700/j.bh.1001-5965.2019.0094(in Chinese)
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Two-phase temperature control accumulator (hereinafter referred to as accumulator) is the key component of mechanically pumped two-phase loop (MPTL) system, which acts like the brain of MPTL system. The accumulator has the functions of storage and supplying of working fluid, gas-liquid separation and precise temperature controlling. In order to study the dynamic behavior of heat and mass transfer between accumulator and MPTL system in response to heat load variations, a transient numerical simulation model is developed for MPTL system by using the Navier-Stokes equations. By comparison between simulation and test results, it is found that the flow rate error of numerical model is in the range of ±10%, which verifies the validity and accuracy of the model. The simulation results show that accumulator will exchange fluid with the main loop in response to 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 and amount of mass transfer between accumulator and main loop will increase with the increase of heat power, and the same increase will occur for the variation trend of temperature and pressure of two-phase fluid in the accumulator. The model can be used to study the variation characteristics of flow rate, temperature, and quality under different operating conditions, which can also be used to design MPTL system and to predict the system characteristics before a system has been built.
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