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, i...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.展开更多
This paper presents a gaskinetic study and analytical results on high speed rarefied gas flows from a planar exit.The beginning of this paper reviews the results for planar free jet expanding into a vacuum,followed by...This paper presents a gaskinetic study and analytical results on high speed rarefied gas flows from a planar exit.The beginning of this paper reviews the results for planar free jet expanding into a vacuum,followed by an investigation of jet impingement on normally set plates with either a diffuse or a specular surface.Presented results include exact solutions for flowfield and surface properties.Numerical simulations with the direct simulation Monte Carlomethod were performed to validate these analytical results,and good agreement with this is obtained for flows at high Knudsen numbers.These highly rarefied jet and jet impingement results can provide references for real jet and jet impingement flows.展开更多
基金NSF-DMS-0914706the Research Enhancement Awards from the New Mexico Space GrantsNSF-CBET-0854411
文摘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.
基金sponsored from NSF-CBET-0854411,NSF-DMS-0914706 and NASA-ZTNMSU012209-DUST.
文摘This paper presents a gaskinetic study and analytical results on high speed rarefied gas flows from a planar exit.The beginning of this paper reviews the results for planar free jet expanding into a vacuum,followed by an investigation of jet impingement on normally set plates with either a diffuse or a specular surface.Presented results include exact solutions for flowfield and surface properties.Numerical simulations with the direct simulation Monte Carlomethod were performed to validate these analytical results,and good agreement with this is obtained for flows at high Knudsen numbers.These highly rarefied jet and jet impingement results can provide references for real jet and jet impingement flows.
