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Gaseous plume flows in space propulsion

Chinese Journal of Aeronautics 2013年第3期26卷 522-528页

作者： Wang Limei Cai Chunpei Department of Mechanical and Aerospace Engineering New Mexico State University

This paper presents a gaskinetic study on high-speed, highly rarefied jets expanding into a vacuum from a cluster of planar or annular exits. Based on the corresponding exact expressions for a planar or annular jet, it is convenient to derive the combined multiple jet flowfield solutions of density and velocity components. For the combined temperature and pressure solutions, extra attention is needed. Several direct simulation Monte Carlo simulation results are provided to validate these analytical solutions. The analytical and numerical solutions are essentially identical for these high Knudsen number jet flows.

关键词： Free molecular flow Gasdynamics Gaskinetics jets Monte Carlo methods plume flow

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Large Eddy Simulations of Rayleigh-Bénard Convection in a Cubic Cavity

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Open Journal of Fluid Dynamics 2023年第3期13卷 177-190页

作者： Tian Qin Yingying Luo Jiemin Zhan Wenqing Hu Yutian Li Ziwei Huang Department of Applied Mechanics and Engineering School of Aeronautics and Astronautics Shenzhen Campus of Sun Yat-sen University Shenzhen China

This paper conducts a Large Eddy Simulation (LES) of Rayleigh Bénard convection in a cubic cavity based on the WMLES S-Omega subgrid-scale model. For a cubic cavity with a vertical temperature difference of 6.7°C and 20°C, the velocity pulsation profiles and the mean velocity profiles of the vertical section in the middle of the cubic cavity were simulated, respectively. And they are consistent with the experiment results. Furthermore, the mean velocity field of the vertical cross-section in the middle of the cavity was calculated. Structures of the mean velocity field in the two cases are similar. A counterclockwise large vortex is found to occupy the cavity, and there are two small clockwise vortices in the lower left and upper right corners, and the mean velocity fields at two different temperature differences are consistent with the experimental results. The two-dimensional instantaneous temperature field and mean temperature field with different cross-sections in the z-direction, as well as the three-dimensional instantaneous isothermal surface structure, indicate that the large-scale circulation motion within the cubic cavity is moving diagonally. In addition, the structure of the mean streamline also illustrates this viewpoint. For the reverse vortex formed at two corners in the mean streamline structure, we used the Q criterion to identify and obtain two vortex structures similar to boomerangs. The basic turbulent structure in RB thermal convection includes the rising and falling plumes generated by buoyancy effects.

关键词： Large Eddy Simulation Rayleigh-Bénard Convection Cubic Cavity plume flow

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