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Experimental investigation of start/unstart process during hypersonic intake at Mach 6 and its control

機(jī)譯：馬赫6時(shí)高速攝入過程中啟動(dòng)/ unstart過程的實(shí)驗(yàn)研究及對照

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Hypersonic intake with 20 and 30% blockage struts is experimentally investigated in Mach 6 flow. Initially the experiments are conducted with full opening of the cowl at fixed condition. The results show that the intake is started for 20% blockage struts while it is unstarted for 30% blockage struts. The unstart process for 30% blockage struts is due to large separation bubble in the engine flow path which is corroborated through steady pressure measurements, time average schlieren images, and oil flow visualization. To understand the separation bubble behaviour associated with start as well as unstart cases, a cowl opening mechanism is indigenously designed, and the experiments are performed using different cowl opening times from closed to fully opened condition. To quantify the separation bubble behaviour, unsteady pressure measurements, time-resolved schlieren images, and spectral analyses are done. For 20% blockage struts, irrespective of cowl opening time, the separation bubble size remains unaltered. In this case, increasing cowl opening time (110, 185, 350, and 700 ms) delays the separation bubble movement, and a maximum delay in the separation bubble movement is noted for 350 ms cowl opening time. It can be concluded that there exists an optimum cowl opening time at which the separation bubble movement can be restricted. Conversely, un-start process is noted for 30% blockage struts regardless of the cowl opening time where the pressure rise because of the separation bubble is found to be twice that of the 20% blockage struts, indicating a substantial increase in the separation bubble size. To alleviate the un-start process, experiments are further carried out using partial cowl opening with fixed as well as dynamic conditions. The results reveal that the un-start process is eased by opening the cowl below 90% of its full opening. (C) 2021 Elsevier Masson SAS. All rights reserved.
機(jī)譯：用20和30％阻塞支柱的高超聲速攝入量在馬赫6流動(dòng)中進(jìn)行實(shí)驗(yàn)研究。最初，實(shí)驗(yàn)是通過固定條件的全開關(guān)的全開關(guān)進(jìn)行。結(jié)果表明，進(jìn)氣開始20％阻塞支柱，同時(shí)未啟動(dòng)30％的阻塞支柱。為30％的堵塞支柱的不起動(dòng)過程是由于在發(fā)動(dòng)機(jī)流路大的分離的氣泡，其通過穩(wěn)定的壓力測量值證實(shí)，時(shí)間平均紋影圖像，和油流的可視化。為了了解與開始相關(guān)的分離氣泡行為以及unstart案例，蜂鳴器打開機(jī)制是本發(fā)明的本發(fā)明的設(shè)計(jì)，并且使用不同的COWL開口時(shí)間從關(guān)閉到完全打開的狀態(tài)進(jìn)行實(shí)驗(yàn)。為了量化分離氣泡行為，不穩(wěn)定的壓力測量，時(shí)間分辨的Schlieren圖像和譜分析。對于20％阻塞支柱，無論渦流通行時(shí)間如何，分離氣泡尺寸保持不變。在這種情況下，增加渦流打開時(shí)間（110,185,350和700ms）延遲分離氣泡運(yùn)動(dòng)，并且注意到分離氣泡運(yùn)動(dòng)中的最大延遲對于350ms的渦流開口時(shí)間?？梢缘贸鼋Y(jié)論，可以限制分離氣泡運(yùn)動(dòng)的最佳渦流開口時(shí)間。相反，不管發(fā)現(xiàn)由于分離氣泡由于分離氣泡的壓力上升的溝槽打開時(shí)間，注意到30％封閉支柱的未啟動(dòng)過程是20％阻塞支柱的兩倍，表明分離氣泡尺寸的顯著增加。為了緩解未啟動(dòng)過程，使用部分渦流開口進(jìn)一步進(jìn)行實(shí)驗(yàn)，該罩開口與固定的和動(dòng)態(tài)條件。結(jié)果表明，通過在90％的全部開口下方的牛頭上，可以緩解UN-START過程。 （c）2021 Elsevier Masson SAS。版權(quán)所有。

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