High-Temperature, Nonreacting Flowfields Generated by a Hypersonic Chemical-Laser Nozzle

摘要

A shock-tube facility was modified to include a single endwall-mounted chemical-laser nozzle, a windowed test section simulating a constant-pressure laser cavity, and a 15-m~3 dump tank. Shock-heated N_2 (1380-1780 K and 17-26 atm) simulated the primary M = 5.0 nozzle flow, and air simulated the secondary-injection gas from a single row of sonic orifices. Single-frame schlieren images of the flowfield with and without secondary injection were obtained. The resulting images show shock-structure details that are useful in the understanding and optimization of chemical-laser nozzles.