Abstract:

The second nozzle of the gain generator in the chemical laser provides optical cavity with chemical fuel and dilute gas, and refrigerates the main nozzle flow. Design optimization of several distribution flow pipeline levels in nozzle blade is vital for uniformization of reaction flow and cooling the nozzle blade by the secondary nozzle flow. Characteristics of the secondary nozzle were studied based on threedimensional fluid dynamics method. Nozzle with three distribution flow pipeline level transport structure and 2SLOT were compared. Flow field uniformity of every distribution flow pipeline levels were calculated under the 1st level inlet pressure of 3atm 5 atm and 8atm. The uniformity of the nozzle with three levels distribution flow pipeline structure is better than 2SLOT nozzle at the same parameters such as area ratio of input and output surfaces and throat. The parameters of existing design of three levels distribution flow pipeline nozzle structure requires further optimization. It is useful to obtain the uniformization of reaction flow with raising the inlet pressure.

Key words: chemical laser;distribution flow pipeline;nozzle