气-气冷流掺混流场缩尺技术

 为研究气-气冷流掺混流场缩尺技术，对多组分气相掺混流动三维Navier-Stokes无量纲方程及其定解条件进行了相似性分析，并将量纲分析方法应用到气-气掺混流动现象中，获得了气-气掺混流场相似准则，该相似准则表明冷流掺混试验件尺寸和试验背压都可以变化；运用该准则，在不同背压工况下进行了3个不同尺寸试验件的单喷嘴气-气喷注器掺混流场的仿真分析和比较，结果表明不同试验件尺寸和不同压力工况下气-气掺混流场具有相似性。研究结果能够指导气-气冷流试验，并为气-气燃烧流场缩尺技术研究提供参考。

Scaling of Gas-gas Cold Flow Fields

Theoretical analysis is performed of the scaling of gas-gas cold flow fields and numerical studies made on the scaling of the flow fields in single-element chambers with gaseous oxygen and gaseous hydrogen. To obtain the scaling criterion of a gas-gas cold flow field, formulation analysis of the gaseous multi-component mixed flow 3D Navier-Stokes equations is conducted and dimensional analysis is also applied to the gas-gas mixing phenomena. The criterion indicates that the size and the testing back pressure of a gas-gas injector chamber can be changed. Based on the criterion, numerical simulations of full-scale and subscale single-element gas-gas injector chambers are studied in a total of three conditions. The results demonstrate that the flow field structures of similar geometry hardwares are similar at different testing back pressures.