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从大量的喷管扩张段型面优化计算结果分析中得出:扩张段型面的曲率分布是影响喷管扩张段气动损失的主要因素,对于给定喷管长度、面积比和出口半角的喷管扩张段型面的近似优化,可根据型面曲率均方差最小来确定.许多算例表明,近似优化型面的相对比冲损失不大于优化型面的0.15%.
From the analysis of a large number of nozzle expansion section profile calculation results, it is concluded that the curvature distribution of the expansion section surface is the main factor that affects the aerodynamic loss of the nozzle expansion section. For a given nozzle length, area ratio and outlet half-angle spray The approximate optimization of tube dilatational section surface can be determined by the minimum mean square error of the surface curvature, and many examples show that the relative impulse loss of the optimized surface is no more than 0.15% of the optimized surface area.