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本文简要介绍了边界层转捩对细长锥静、动稳定性影响的实验情况及对结果的分析。实验马赫数M_∞=5.047。模型为一个正圆锥,半锥角θ_c=10°。以模型长为特征尺寸的自由流月R_e数的变化范围为2.2×10~6到13.3×10~6。实验表明;R_e数对细长锥的稳定性有重要的影响。主要原因是R_e数的变化将导致锥面边界层自然转捩位置的改变、因而转捩产生的诱导力矩、诱导阻尼力矩随之发生变化。当转捩发生在后体物面上时,模型的静稳定性下降而动稳定性增加;反之,当转捩发生在前体物面上时,则静稳定性增加而动稳定性下降。静稳定性随R_e数的变化与动稳定性随R_e数的变化之间呈现出对应关系。
This paper briefly introduces the experimental results of the influence of the boundary layer transition on the static and dynamic stability of the slender cone and the analysis of the results. The experimental Mach number M_∞ = 5.047. The model is a positive cone, half cone angle θ_c = 10 °. The range of variation of R_e in free runoff with the feature length of model length is 2.2 × 10 ~ 6 to 13.3 × 10 ~ 6. Experiments show that the number of R_e has an important influence on the stability of the elongated cone. The main reason is that the change of R_e will lead to the change of the natural transition position of the cone boundary layer, and the induced moment produced by the transition will change with the induced damping moment. When the transition occurs on the body surface, the static stability of the model decreases and the dynamic stability increases. On the other hand, when the transition occurs on the surface of the precursor, the static stability increases and the dynamic stability decreases. Static stability with R_e number changes and dynamic stability with R_e number showed a change between the corresponding relationship.