| Citation: | JIN Xuhong, YAO Yuzhu, CHENG Xiaoli, et al. Numerical simulation for the hypersonic flow structure and thermal environment of non-rectangular cavities in the rarefied slip regime[J]. Journal of Aerospace Power, 2024, 39（10）：20220755 doi: 10.13224/j.cnki.jasp.20220755
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In order to quantify the local high pressure and heat loads due to cavities or imperfections on the surface of hypersonic vehicles, the direct simulation Monte Carlo (DSMC) was utilized to simulate the rarefied hypersonic flows over cavities in the slip regime. Three kinds of cavities were taken into account: the standard rectangular cavity, the shallower-front cavity, and the shallower-back cavity, for the purpose of gaining the effects of cavity-floor shape on flow characteristics inside the cavity, surface pressure and heat transfer to the cavity surfaces. Results showed that the cavity-floor shape had little influence on flow characteristics, including the streamline pattern, vortex-core position and density distribution, inside the upper part of cavities. Therefore, the surface pressure and heat transfer to the upper part of the aft wall of the cavity was kept unchanged when the front or back part of the cavity floor became shallower. However, in comparison with the standard rectangular cavity, both the shallower-front and shallower-back cavities suffered more severe heat loads on the cavity floor. Especially, the peak value of heat transfer to the cavity floor in the case of shallower-back cavity was 100 times larger than the corresponding value in the standard rectangular cavity. In the design of spacecraft, the cavity floor is exactly taken as the spacecraft surface, so much attention should be paid to the pressure and heat loads on the cavity floor in case of shallower-back cavity.
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