What is it about?
Hypersonic rarefied-gas flows near simple-shape bodies (wedges, disks, plates, and spheres), rotating cylinders, toroidal ballutes, and hypersonic engine inlets have been studied under the conditions of wind-tunnel experiments and hypersonic flights. The direct simulation Monte-Carlo (DSMC) method is used to study the influence of similarity parameters on aerodynamic coefficients in air, He, Ar, N2, and CO2. Important kinetic effects in this flow regime have been studied: nonmonotonic lift and drag of plates, strong repulsive force between side-by-side plates and cylinders, dependence of drag on torus radii ratio, and the reverse Magnus effect on the lift of a rotating cylinder.
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Why is it important?
Important kinetic effects in this flow regime have been studied: nonmonotonic lift and drag of plates, strong repulsive force between side-by-side plates and cylinders, dependence of drag on torus radii ratio, and the reverse Magnus effect on the lift of a rotating cylinder. These effects are significantly different in "classical" continuum flows and free-molecular (non-collisional) flow regimes.
Perspectives
These effects should be put into considerations at the preliminary design stage of complex space probes for flights in low-density layers of planetary atmospheres.
Vladimir Riabov
Rivier University
Read the Original
This page is a summary of: Numerical and Experimental Simulation Techniques in Hypersonic Low-Density Aerothermodynamics, March 2020, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2020-2416.
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