多体分离抛撒初条件与分离特征参数

Cast Primary Condition and Separation Characteristic Parameter of Multi-bodies Separation

多次风洞自由飞多体分离抛撒实验均证实了被抛撒物运动初条件对抛离成功与否有决定性影响;为此可采取"戴帽"措施;但数值计算结果与此相反,因而需深入开展研究,解决问题。常规形式的风洞测力方法,无法模拟各分离体之间很大的相对速度。分离过程中"特征时间"是很小的,因而风洞实验以及数值计算必须计及非常小的"特征时间"所反映的非定常气动力。多体分离的实践表明,至少在快速分离过程中运动动力学相似是必需的。

Many times wind tunnel free flight multi-bodies separation cast tests identified that, casted body's movement primary condition decided whether the separation succeeded or not. Thus, we applied 'Cap'. However, the value calculation result was contrary to it. So it need study more to resolve the problem. The usual wind tunnel measurement method could not modify the very large relative speed between each separated body. The 'Characteristic time' during the separation period is very small. Thus, the unsteady aerodynamic strength reflected by the very small Characteristic time, must be included in both the wind tunnel test and value calculation. Multi-bodies separation practice shows that, at least in fast separation, movement dynamic resemblement is necessary.