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本文介绍了双锥轴对称超音速进气道在来流M_∞=1.97、0°攻角下,几何喉道、中心锥体表面上静压脉动时间历程随流量系数的变化特征。在稳定的超临界和亚临界下,静压时间历程平稳;喘振时,静压脉动值很高,其ΔPr.m.s约为稳定的超临界下的几倍,压力脉动的主特征频率为43.75Hz。 本文的重点是研究轴对称超音速进气道在较大攻角下的喘振特征及其控制效果。进气道喘振时,中心锥背风侧的头波首先产生大振幅的激烈振荡,其压力脉动的主特征频率为18.75Hz,静压脉动的ΔPr.m.s约为迎风侧的二倍;而迎风侧的头波仅作较小振幅的振荡,静压脉动的主特征频率为20Hz,同背风侧的很接近。文中对比了喘振和由于吸除附面层消喘后的头波特征、中心锥体背风侧和迎风侧各自的静压脉动时间历程、静压脉动主特征频率的变化。指出消喘后的背风侧锥面静压ΔPr.m.s仅为喘振时的1/3;迎风侧的静压ΔPr.m.s仅为喘振时的1/2;文中最后对轴对称进气道在较大攻角下的喘振特征作了分析。
In this paper, the variation characteristics of hydrostatic pulsation time history with the flow coefficient of the geometric throat and the central cone under the attack angle of M_∞ = 1.97,0 ° are introduced with the biconical axisymmetric supersonic inlet. Under stable supercritical and subcritical conditions, the hydrostatic time history is stable. During the surge, the pulsation value of the hydrostatic pressure is very high. The ΔPr.ms is about several times as high as that under the supercritical pressure. The main characteristic frequency of the pressure pulsation is 43.75 Hz. The emphasis of this paper is to investigate the surge characteristics and the control effect of the axisymmetric supersonic inlet at a greater angle of attack. In the surge of the inlet, the first wave of the leeward side of the central cone firstly produces intense oscillations of large amplitude with the main characteristic frequency of pressure pulsation being 18.75Hz and the ΔPr.ms of pulsation of static pressure being twice as large as the windward side; The first wave of the side oscillates only with a small amplitude, and the main characteristic frequency of the hydrostatic pulsation is 20 Hz, which is very close to the leeward side. In this paper, the variations of surge and the characteristics of the first wave, the levitation time of the leeward side of the central cone and the windward side of the central cone, and the variation of the main characteristic frequency of the static pressure pulsation are compared. It is pointed out that the leeward-side cone static pressure ΔPr.ms after antisampling is only 1/3 of that during surge; the static pressure ΔPr.ms on the windward side is only 1/2 of that during surge; The characteristics of surge at larger angles of attack are analyzed.