Experimental Investigation Of An Auto-Ignition Igniter With Hydrogen Peroxide

In the auto-ignition igniter with knock-down subsections that uses decomposed hydrogen peroxide as the oxidizer, the liquid fuel is vaporized and autoignites when injected into the hot decomposition products.Theory of combustion dynamics, Semenov auto-ignition and method of prediction of auto-ignition by the Semenov Equation were introduced in the dissertation. The decomposition process, proven decomposition methods, decomposition evaluation and decomposition model of hydrogen peroxide were discussed. The decomposition process of hydrogen peroxide in a catalyst bed was numerically simulated with a 1-D model.The performance of catalyst beds was experimentally studied. The influence on decomposition was investigated with changing the mass flux through the cross of the catalyst bed and the initial temperature of the catalyst bed. The experimental results were compared with those of the numerical simulation.The influence on auto-ignition of different injectors and nozzles was experimentally researched. The results indicate that auto-ignition occurs more easily when the igniter uses the cross injector with rearward facing step, the height of the rearward facing step influences the stability of the combustion flame, the longer the combustor characteristic length is, the more easily auto-ignition occurs.The effect of the combustor temperature, pressure and coefficient of residual oxygen was experimentally investigated when the fuel was injected into the combustor. The results indicate that with the coefficient of residual oxygen being less than 1 or around 1, when the fuel is injected into the combustor at the same combustor pressure, the higher the combustor temperature is, the less the coefficient of residual oxygen is when auto-ignition occurs; when the fuel is injected into the combustor at the same combustor temperature, the larger the combustor pressure is, the less the coefficient of residual oxygen is when auto-ignition occurs; when the fuel is injected into the combustor at the same combustor temperature and pressure, the bigger the coefficient of residual oxygen is, the more easily auto-ignition occurs.The research shows the feasibility of the hydrogen peroxide auto-ignition igniter. Knowledge and experience of auto-ignition igniter design and test have been acquired, which is a good foundation of further study.