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采用定常与非定常数值计算相结合的方法研究了一种中心线偏置的隔离段流场,分析了不同反压作用下的激波串特征。通过模拟隔离段反压升高和降低的过程,研究了隔离段内激波串的迟滞特性,并比较了扩张比为0,10%,37%隔离段内迟滞特性的差异。结果表明,在来流马赫数2.0条件下,所研究隔离段内存在两种类型的迟滞现象;在同一反压条件下,降压路径对应的激波串更靠近管道入口。当反压接近隔离段所能承受的最大反压时,流场迟滞现象消失。隔离段扩张比越大(如37%),激波串位置出现迟滞的反压范围越宽,迟滞量越小。最后利用流量匹配的观点从无粘角度解释了有粘流道内的激波串迟滞现象。
A steady-state and unsteady numerical method is used to study the flow field in the isolated section with center line bias. The characteristics of the shock train under different backpressures are analyzed. The hysteresis characteristics of the shock train in the isolated section were studied by simulating the rise and fall of backpressure in the isolated section, and the difference of hysteresis characteristics in the isolation section with the expansion ratio of 0, 10% and 37% was compared. The results show that there are two types of hysteresis in the isolation section under the condition of Mach Mach 2.0. Under the same backpressure, the shock train corresponding to the buck path is closer to the pipe entrance. When the back pressure close to the isolation section can withstand the maximum back pressure, the flow hysteresis disappears. The larger the segmental expansion ratio (eg, 37%), the wider the range of back pressure at which hysteresis occurs at the shock train position and the smaller the amount of hysteresis. In the end, the phenomenon of hysteresis of shock wave in a viscous flow channel is explained from the perspective of flow rate matching from the perspective of flow rate.