Disturbances propagation processes are investigated in two-dimensional boundary layers for the case of strong viscous-inviscid interaction. The speed of upstream disturbances propagation as a function of specific heat...Disturbances propagation processes are investigated in two-dimensional boundary layers for the case of strong viscous-inviscid interaction. The speed of upstream disturbances propagation as a function of specific heat ratio and Prandtl number is determined. Formula for speed propagation is developed on the basis of characteristics and subcharacteristics analysis corresponding to the gasdynamic wave processes and processes of convection and diffusion.展开更多
A common denominator between conical-symmetry and conical shock interaction is the spanwise pressure gradient,which perform more non-uniformity and its interactionflow is more complicated than the spanwise-homogeneous...A common denominator between conical-symmetry and conical shock interaction is the spanwise pressure gradient,which perform more non-uniformity and its interactionflow is more complicated than the spanwise-homogeneous planar shock wave.Recent advances in conical-symmetry and conical shock interactions with turbulent boundary layer are reviewed in specific areas:(i)quasi-conical swept interactions due to compression ramps and sharpfins,(ii)impinging conical shock wave with interactions of plate wall,(iii)laminar double cone in-teractions with consideration of real-gas effects.Substantial success has been achieved in describing the phenomena of the time averaged and instantaneousflow features and the low-frequency unsteadiness,including correlations and coherent structures in the separation bubble,through complementary experimental and numerical studies of swept shock interactions.All available observations are here scrutinized to infer underlying mechanisms of interactions in conicalflow,and provide theoretical foundation and hints forfluidic control techniques.Com-parison with high-fidelity direct numerical simulations is used to quantified the uncertainty of RANS turbulence models in complex interactions.Regarding heat transfer,extensive studies of hypersonicflow over double cone geometries have shown that those can be predicted with reasonable accuracy,even in the presence of high-temperature effects.展开更多
文摘Disturbances propagation processes are investigated in two-dimensional boundary layers for the case of strong viscous-inviscid interaction. The speed of upstream disturbances propagation as a function of specific heat ratio and Prandtl number is determined. Formula for speed propagation is developed on the basis of characteristics and subcharacteristics analysis corresponding to the gasdynamic wave processes and processes of convection and diffusion.
基金supported by the National Natural Science Foundation of China under project numbers 12002261.National Postdoctoral Program for Innovative Talents,China (No.BX20200267)。
文摘A common denominator between conical-symmetry and conical shock interaction is the spanwise pressure gradient,which perform more non-uniformity and its interactionflow is more complicated than the spanwise-homogeneous planar shock wave.Recent advances in conical-symmetry and conical shock interactions with turbulent boundary layer are reviewed in specific areas:(i)quasi-conical swept interactions due to compression ramps and sharpfins,(ii)impinging conical shock wave with interactions of plate wall,(iii)laminar double cone in-teractions with consideration of real-gas effects.Substantial success has been achieved in describing the phenomena of the time averaged and instantaneousflow features and the low-frequency unsteadiness,including correlations and coherent structures in the separation bubble,through complementary experimental and numerical studies of swept shock interactions.All available observations are here scrutinized to infer underlying mechanisms of interactions in conicalflow,and provide theoretical foundation and hints forfluidic control techniques.Com-parison with high-fidelity direct numerical simulations is used to quantified the uncertainty of RANS turbulence models in complex interactions.Regarding heat transfer,extensive studies of hypersonicflow over double cone geometries have shown that those can be predicted with reasonable accuracy,even in the presence of high-temperature effects.
