TY - GEN
T1 - NUMERICAL INVESTIGATION OF THE EFFECT OF WALL TEMPERATURE ON THERMAL ENVIRONMENT OF TWO-DIMENSIONAL TRANSVERSE GAP
AU - Bo, Qiu
AU - Ruizhi, Li
AU - Xiao, Liu
AU - Jie, Yao
AU - Bo, Jiang
AU - Yuanhao, Zhu
N1 - Publisher Copyright:
© 2021 32nd Congress of the International Council of the Aeronautical Sciences, ICAS 2021. All rights reserved.
PY - 2021
Y1 - 2021
N2 - By solving the compressible Navier-Stokes equations, a CFD software is developed independently, which can well simulate the flow in the gap in hypersonic vehicle surface. An analytical study has been performed through this software to investigate the wall temperature effects on thermal environment of two-dimensional transverse gap, and the mechanism of the influence is also analyzed. The research indicates that the influence of wall temperature change on thermal environment mainly comes from two aspects：one is to change the wall temperature gradient directly, the other is to change the physical parameters near the wall, and then change the whole flow structure. The joint action of the two aspects determine the variation law of the heat flux distribution. For the gap flow, the local high heat flux regions are mainly caused by the reattachment flow. On the one hand, increasing the wall temperature will reduce the wall temperature gradient, which will lead to the decrease of the heat flux; on the other hand, it will increase the viscosity coefficient near the wall, thicken the boundary layer, enhance the viscous dissipation, restrain the separation and reattachment flow at the entrance of the gap and the vortexes flow in the gap, which will greatly reduce the corresponding heat flux peak value. The hot wall correction formula widely used in engineering application ignores the influence of wall temperature on the flow structure. So the local heat protection design using the hot wall correction formula will produce a large deviation.
AB - By solving the compressible Navier-Stokes equations, a CFD software is developed independently, which can well simulate the flow in the gap in hypersonic vehicle surface. An analytical study has been performed through this software to investigate the wall temperature effects on thermal environment of two-dimensional transverse gap, and the mechanism of the influence is also analyzed. The research indicates that the influence of wall temperature change on thermal environment mainly comes from two aspects：one is to change the wall temperature gradient directly, the other is to change the physical parameters near the wall, and then change the whole flow structure. The joint action of the two aspects determine the variation law of the heat flux distribution. For the gap flow, the local high heat flux regions are mainly caused by the reattachment flow. On the one hand, increasing the wall temperature will reduce the wall temperature gradient, which will lead to the decrease of the heat flux; on the other hand, it will increase the viscosity coefficient near the wall, thicken the boundary layer, enhance the viscous dissipation, restrain the separation and reattachment flow at the entrance of the gap and the vortexes flow in the gap, which will greatly reduce the corresponding heat flux peak value. The hot wall correction formula widely used in engineering application ignores the influence of wall temperature on the flow structure. So the local heat protection design using the hot wall correction formula will produce a large deviation.
KW - Gap
KW - Heat-flux distribution
KW - Hypersonic
KW - Numerical simulation
KW - Wall temperature
UR - https://www.scopus.com/pages/publications/85124492761
M3 - 会议稿件
AN - SCOPUS:85124492761
T3 - 32nd Congress of the International Council of the Aeronautical Sciences, ICAS 2021
BT - 32nd Congress of the International Council of the Aeronautical Sciences, ICAS 2021
PB - International Council of the Aeronautical Sciences
T2 - 32nd Congress of the International Council of the Aeronautical Sciences, ICAS 2021
Y2 - 6 September 2021 through 10 September 2021
ER -