Study on flow characteristics of adjustable inlet seal chamber with wide speed range

DOI:	10.11809/bqzbgcxb2024.09.021
Keywords:	hypersonic vehicle; variable geometry inlet; chip seal; long sealing chamber; numerical simulation
Abstract:	When the adjustable inlet port is used to meet the demand of wide velocity air intake of hypersonic vehicle, the dynamic seal structure needs to be installed inside the inlet port. Ceramic grid seals are the ideal choice due to their excellent wear resistance and high temperature oxidation resistance. When the ceramic grating is used as a seal, a three dimensional cavity flow is formed in the sealing chamber, which is affected by the boundary layer of the side plate. Based on the sealing cavity model, the decoupling of the sealing cavity flow and the leakage channel flow is proposed, and the sealing model and leakage model of the inlet are modeled respectively.The influence of different inlet conditions on the flow characteristics and leakage law of long sealed cavity was studied by changing the inlet boundary layer thickness and inlet velocity using numerical simulation method. It is found that the long sealed cavity behaves as an open cavity flow at Ma4.5 hypersonic flow, and is more sensitive to the changes of boundary layer thickness and incoming Mach number than the short sealed cavity. The change of incoming Mach number makes the flow structure in the sealed cavity change greatly, and the pressure distribution at the inlet of the corresponding leakage channel is also very different.
Issue:	Vol. 45 No. 9 (2024)
Published:	2024-09-30
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