Transactions of Nanjing University of Aeronautics & Astronautics
Flow and Leakage Characteristics in Sealing Chamber of a Variable Geometry Hypersonic Inlet
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Abstract:
When the variable geometry hypersonic inlet is sealed with ceramic wafers， the cavity flows inside the sealing chamber can be affected by the boundary layer near the side wall. To study the influence of the boundary layer thickness near the side wall on the flow and leakage characteristics in sealing chamber， the numerical calculation of the cavity flow in the sealing chamber under different inflow boundary layer thicknesses is carried out. The results show that three-dimensional cavity flow structures are close to being asymmetric， and the entrance pressure of the leakage path can also be affected by asymmetry； with the increase of the thickness of the boundary layer， the pressure at the cavity floor and the seal entrance decreases. Finally， the existing leakage prediction model is modified according to the distribution rule of the cavity floor and the flow properties in the leakage path.
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Project Supported:
This work was supported by the Opening Foundation of National State Key Laboratory of High Temperature Gas Dynamics （No.2021KF07）.
Clc Number:
V211.3
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