10°尖锥转捩诱导负荷的实验研究

EXPERIMENTAL STUDY OF TRANSITION INDUCED LOADINGS ON 10°SHARP CONE

当θｃ＝１０°之尖锥边界层出现转捩流态时，由于背风面与迎风面边界层转捩的不对称性所诱导的气动负荷，包括诱导法向力，诱导俯仰力矩，以及诱导法向力的作用点要随雷诺数而变化，转捩诱导法向力的存在，证实边界层转捩会在物面上诱导出压力增量，即存在着转捩诱导压力。

In this paper,the effect of boundary layer transition to sharp cone is studied experimentally,on the condition when M = 5, α= 0°, θc=10°,and Re=(2. 3～13.8) × 106. Experimental results show that,the asymmetric transition between leeward and windward of 10°sharp cone will produce on the cone a transition induced normal force,whose direction is in opposition with that of the normal force of non-viscous flow and the acting point is allocated shortly behind the transitional belt. This induced normal force will cause obvious variation of pressure center of the sharp cone along with Reynolds number,maximum amount of forward movement can reach up to 2. 7%.In this paper,curves of aerodynamic coefficients of transition induced normal force to Reynolds number are given out,such as its moment coefficients to cone nosetip,its acting point and transition induced variation of pressure center,also this paper proves out that boundary layer transition will cause pressure variation on body surface.