火箭发射燃气喷流缩比试验相似参数

文章在总结、分析国内外发射燃气喷流缩比试验相似参数的基础上,提出了模拟火箭发射初期燃气喷流缩比试验五个基本相似参数.利用发射燃气动力学理论较为系统地说明:满足这五个相似参数,缩比模型试验的燃气流场结构与原型试验的燃气流场结构保持线性几何相似关系,空间对应位置处流场参数一致,缩比发射设备承载与原型发射设备承载之间保持平方缩比关系.同时指出燃气喷流流场结构与燃气物性密切相关,燃气物性不同的喷流流场之间不存在严格意义的流场分布相似及动力学相似关系.

The similarity parameters of subscale test for simulating dynamics of launch combustion-gas jet

On the Basis of the domestic and international study, the five similarity parameters of scaling test are put forward for simulating dynamics of launch combustion-gas jet. With some grown-up theories of launch combustion-gas dynamics, the study shows that the combustion-gas flow field structure of the subscale model test is similar to that Of prototype test and keeps of linear geometric similarity, while the combustion-flow parameters is same as that of prototype test at the corresponding spot and the load of subscale launch apparatus is subduplicate proportional to that of prototype test. As the combustion-gas flow field structure is closely to the properties of combustion-gas, there is no strictly similar distribution and characteristics of dynamics about the different properties of combustion-gas jet between subscale model test and prototype test.