EXPERIMENTAL AND THEORETICAL INVESTIGATION ON WORKING CHARACTERISTICS OF A HIGH TEMPERATURE H2-AIR GAS GENERATOR

A series of hot-fire tests of a gas generator using air and hydrogen were carried out to study its working characteristics at temperature above 1200 K. The duration of single test reaches 20 s and the total time is more than 100 s. No ablation has been found after the tests. The results show that the long-term stable working of the gas generator can be achieved without additional cooling structure while the combustion efficiency is not less than 92%. The structural configuration of the injectors, which may weaken the mixing of the gas to low mixing ratio, is inferred to be the main reason for the above results. Based on the analysis of the flow characteristics in the gas generator, a theoretical multi-zone model considering the flow, combustion and heat transfer is proposed to estimate the gas temperature in the near-wall and the central regions. The calculation deviations of the model are less than 10%. The experimental data and theoretical analysis of this work can provide reference for the design of high temperature gas generators.