具有变截面驱动段及自由开口端的激波管流场计算

FLOW FIELD EVALUATION FOR A SHOCK TUBE WITH AREA CHANGE IN THE DRIVER AND FREE OPEN END

本文用随机选取法计算了一个具有变截面驱动段及自由开口端的激波管流场。在自由开口端,考虑了全部可能的出流及入流情况。计算结果表明,这种边界条件处理方法正确地预示了波系在自由开口端的相互作用及反射,与试验结果及BRL的一维流计算结果相比,三者吻合程度令人满意。

A Computational effort by using Random-Choice Methodto model the gas dynamics of a shock tube with area change in thedriver and with open end has been made. All possible flow patterns at the open end are considered. The numerical results obtained with RCMshow that the method correctly predicts waves interaction andreflection at the open end of the shock tube. Furthermore, the RCMresults compared in three cases to BRL experimental data and tonumerical predictions by means of the BRL computer code. Thecomparisons are in good agreements.