Chislennoe modelirovanie gazodinamicheskikh protsessov v trakte gazodinamicheskoi truby
A feature of the gas dynamic tunnel (GDT) for testing a solid rocket motor (SRM) is a heat impact on the structure in the two phase jet attachment zone of combustion products (gas and condensed phase) to the diffuser wall. Therefore, in the GDT for SRM tests there is a combined cooling system: along with regenerative cooling it contains water injection into the zone where two phase jet of the combustion products attaches to diffuser wall. At the same time it is essential to organize the water injection into the GDT tract. It is necessary to select the flow of water supplied to the injection, the diameter, location, and orientation of the nozzles through which water injection. The bad choice of the above parameters can lead to inefficient cooling GDT, reducing service life and impossibility of the unseparated outflow from a nozzle. The numerical simulation of the gas dynamic processes in the GTD tract was performed in a software package for computational gas dynamics. The focus is on the complex implementation of a multi component multi phase flow during simultaneous operation of SRM and water spray system, taking into account the phase transition of water droplets to the vapor state. The comparison of the results of computational experiments with the experimental data was carried out. The ways of improving the efficiency of the cooling GDT by more reasonable design of the water spray system were suggested.