趋于临界马赫数的圆柱跨声速绕流特性分析

Abstract

Abstract: Detailed knowledge about flow characteristics of the transonic flow past a circular cylinder towards the critical Mach number Ma_cr can provide an aerodynamics theory basis for increased lift and drag reduction of the new aircraft. Numerical investigation of the transonic flow past a circular cylinder is carried out by means of an large eddy simulation technique for two free-stream Mach numbers Ma_∞=0.75and 0.85, and Reynolds number based on the cylinder diameter Re=2×10⁵. Results show that towards the critical Mach number (Ma_cr≈0.9), drag of the cylinder is reduced and lift coefficient fluctuation is suppressed. Based on the force decomposition, it is found that the drag reduction is attributed to the vortex force rather than the compressing process. Usually, drag reduction of a bluff body is closely associated with the higher base pressure distribution. Analysis of the convective Mach number Ma_c indicates that Ma_c in the initial stage of the shear layers increases with Ma_∞, while its growth rate decreases, which results in a more stable shear layer and higher pressure distribution. Furthermore, less turbulent fluctuation in the near wake of the circular cylinder at Ma_∞=0.85 corresponds to the eliminated shock wave at the separation point and delayed shock wave in the near wake. Finally, the wall pressure fluctuation and fluctuating lift coefficient are suppressed.

Key words: shock waves, circular cylinder, compressible turbulence, large eddy simulation, subgrid-scale model

CLC Number:

V211.3

XU Changyue, ZHAO Liqing, WANG Conglei, SUN Jianhong. Characteristics Analysis of the Transonic Flow past a Circular Cylinder Towards the Critical Mach Number[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2012, 33(11): 1984-1992.

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Characteristics Analysis of the Transonic Flow past a Circular Cylinder Towards the Critical Mach Number

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