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发表时间：2022-10-09
发表刊物：推进技术
所属单位：运载工程与力学学部
卷号：39
期号：3
页面范围：612-618
ISSN号：1001-4055
摘要：In order to analyze the flow and heat transfer inside the catalytic bed of monopropellant rocket thruster in detail, a mesh generation method was proposed for the random distribution of particles in packed bed, which is suitable for the numerical simulation of pipe flow with a large number of particles naturally packed. Based on this method, the flow and unsteady heat transfer of liquid medium in the packed bed were simulated by changing diameter of the particle and inlet velocity of the pipe, and compared with the experimental results and the Ergun equation results. The results show that the proposed method can effectively simulate fluid flow and heat transfer within the packed bed where particles randomly packed and is suitable for simulation of packed bed with a large number of particles. The simulation results agree well with the experimental results when the grid scale is less than 1/20 particles diameter. Under the same Reynolds number, the friction coefficient decreases with the increase of particle diameter, and the flow resistance calculated by Ergun equation at high Reynolds number is larger than the simulation. In unsteady heat transfer process, near wall temperature approaches to fluid temperature firstly because of wall effect. © 2018, Editorial Department of Journal of Propulsion Technology. All right reserved.
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