Numerical Study of Shock-Reflection Hysteresis in an Underexpanded Jet
Numerical Study of Shock-Reflection Hysteresis in an Underexpanded Jet
复制标题
欠膨胀射流冲击反射滞后的数值研究
DOI：
10.2514/2.954
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发表时间：
2000
期刊：
影响因子：
2.5
通讯作者：
B. Richards
中科院分区：
文献类型：
--
作者：
B. Gribben;K. Badcock;B. Richards
用Navier-Stokes方程求解器研究了低密度、轴对称高度欠膨胀空气射流中的激波-阻力截面滞后和羽流结构。这种类型的射流存在于许多应用中，例如，火箭排气管和燃料喷射器。羽流结构是复杂的，涉及到几个气流特征的相互作用，使这成为一个苛刻的问题。两种类型的激波分离出现在羽流中，规则和马赫，取决于射流压力比。已经预测了可能发生任何一种类型的双解域的存在，与氮气射流观察到相同现象的实验一致。在激波-反冲类型中有一个滞后现象;在双解域中观察到的反冲类型取决于羽流发展的时间历程。一个准稳态的方法来计算整个磁滞回线。采用隐式、多块结构的有限体积流求解器。计算研究的结果被用来检查羽流的结构，并在可能的情况下与实验数据进行比较。艾德发现了一些实验上未发现的流动特征，特别是马赫盘的曲率、马赫盘后的回流和具有马赫-回流特性的规则回流。
Shock-ree ection hysteresis and plume structure in a low-density, axisymmetric highly underexpanded air jet is examined using a Navier ‐Stokes e ow solver. This type of jet is found in a number of applications, e.g., rocket exhausts and fuel injectors. The plume structure is complex, involving the interaction of several e ow features, making this a demanding problem. Two types of shock ree ection appear to occur in the plume, regular and Mach, depending on the jet pressure ratio. The existence of a dual solution domain where either type may occur has been predicted, in agreement with experiment where the same phenomenon has been observed for a nitrogen jet. There is a hysteresis in the shock-ree ection type; the ree ection type observed in the dual-solution domain depends on the time history of the plume development. A quasi-steady approach is employed to calculate the entire hysteresis loop. An implicit, multiblock structured, e nite volume e ow solver is used. The results of the computational study are used to examine the structure of the plume and are compared with experimental data where possible. Some e ow features not initially recognized from experiment have been identie ed, notably curvature of the Mach disk, recirculation behind the Mach disk, and the regular ree ection having Mach-ree ection characteristics.