两相流喷管面积比和扩张段型面的优化计算

喷管面积比的选择和气动型面的设计是喷管设计中的一个重要课题。本文应用二维两相喷管流场计算程序和直接优化法,对喷管面积比及扩张段型面进行了二维寻优计算。计算表明:考虑二维两相流损失的推力最大的面积比要明显小于理论最佳面积比;对于锥形喷管,能量最佳面积比大于冲重比最大的面积比,而对于特性喷管,只是稍大一些;特性喷管的最优型面,就是最佳面积比下的最佳型面。

Optimization Techniques of Nozzle Contour Design and Area Ratio Selection for Two-Phase Nozzle Flow

The area ratio selection and nozzle contour design are important tasks. In this paper, the two-dimensional optimization technique is used to optimize area ratio and nozzle contour by means of the program of computation of two- phase nozzle flow and direct optimization techniques. It is shown that the area ratio of thrust maximum considering two-dimensional two-phase loss is much smaller than the theorectical optimum area ratio, and it is greater than that of impulse-weight ratio maximum for conical nozzle, and it is just a little greater than that one for contour nozzle, and the optimization contour is the optimization contour under optimum area ratio for contour nozzle.