Skin-friction and heat-transfer decompositions in hypersonic transitional and turbulent boundary layers

Xu, Dehao1; Wang, Jianchun2; Chen, Shiyi1,2

2022-04-25

10.1017/jfm.2022.269

JOURNAL OF FLUID MECHANICS   影响因子和分区

0022-1120

1469-7645

The decompositions of the skin-friction and heat-transfer coefficients based on the twofold repeated integration in hypersonic transitional and turbulent boundary layers are analysed to give some major reasons of the overshoot phenomena of the wall skin friction and heat transfer. It is shown that the overshoot of the skin-friction coefficient is mainly caused by the drastic change of the mean velocity profiles, especially the strong negative streamwise gradient of the mean streamwise velocity far from the wall; and the overshoot of the heat-transfer coefficient is primarily due to the viscous dissipation, especially the strong positive vertical gradient of the mean streamwise velocity near the wall. These observations are different from the previous observations that the Reynolds shear stress and Reynolds heat flux are the reasons, respectively. Further investigations show that the above observations are independent of the set-up of the wall blowing and suction parameters, which indicates the universality of the major reasons of the overshoot phenomena in our numerical simulations. In the hypersonic turbulent boundary layers, it is observed that the strongly cooled wall temperature and the high Mach number can slightly enhance the contribution of the Reynolds shear stress, and weaken the contribution of the mean convection, mainly due to the strong compressibility effect. Moreover, the magnitudes of the relative contributions of the mean convection, pressure dilatation, viscous dissipation and the Reynolds heat flux increase as the wall temperature increases.

compressible boundary layers hypersonic flow

SCI ; EI

英语

通讯

NSFC Basic Science Center Program[11988102] ; National Natural Science Foundation of China[91952104,92052301,12172161,91752201] ; Technology and Innovation Commission of Shenzhen Municipality["KQTD20180411143441009","JCYJ20170412151759222"] ; Department of Science and Technology of Guangdong Province[2019B21203001]

Mechanics ; Physics

Mechanics ; Physics, Fluids & Plasmas

WOS:000786652000001

CAMBRIDGE UNIV PRESS

20222012103697

Aerodynamics ; Boundary layer flow ; Heat convection ; Heat flux ; Heat transfer coefficients ; Hypersonic flow ; Mach number ; Shear flow ; Shear stress ; Skin friction ; Turbulence ; Turbulent flow ; Viscous flow

Fluid Flow, General:631.1 ; Heat Transfer:641.2 ; Aerodynamics, General:651.1 ; Mechanical Variables Measurements:943.2

ENGINEERING

Web of Science

1.Peking Univ, Coll Engn, State Key Lab Turbulence & Complex Syst, Beijing 100871, Peoples R China
2.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Peoples R China

Xu, Dehao,Wang, Jianchun,Chen, Shiyi. Skin-friction and heat-transfer decompositions in hypersonic transitional and turbulent boundary layers[J]. JOURNAL OF FLUID MECHANICS,2022,941.

Xu, Dehao,Wang, Jianchun,&Chen, Shiyi.(2022).Skin-friction and heat-transfer decompositions in hypersonic transitional and turbulent boundary layers.JOURNAL OF FLUID MECHANICS,941.

Xu, Dehao,et al."Skin-friction and heat-transfer decompositions in hypersonic transitional and turbulent boundary layers".JOURNAL OF FLUID MECHANICS 941(2022).