Research On The Ignition And Combustion Performance Of Air/Kerosene/Water Gas Generator

Theoretical analysis, experimental investigation and numerical simulation of the ignition characteristic and combustion performance of air/kerosene/water gas generator are conducted in this essay. The results are of great significance to the design, performance improvement and experiment setup of air/kerosene/water gas generator.Firstly, cold spray experiments are used to study the flow characteristics and atomization property of gas generator injector, and spray experiments of two distribution structures of gas generator injectors are conducted to choose one distribution manner of better atomization property. The results suggest that: swirl injector used vortex generator has better atomization property than other injectors, so it is used in hot tests; compared with the distribution manner of single circle with three injectors, the distribution manner of single circle with six injectors equally distributed has better atomization particle equality and thinner atomization particle.Secondly, gas generator hot test test-bed has been set up to investigate the ignition characteristic and combustion performance of this gas generator by experiments. The reliable ignition of this gas generator is achieved by changing gas generator excess oxidizer coefficient, adjusting air slot width, installing flame stabilization facility and varying its position, regulating time sequence, etc. Excess oxidizer coefficient, flame stabilization facility, water content, etc. have been studied in the influence of flame stability and combustion efficiency in gas generator. The results show that: it is necessary to rely on appropriate flame stabilization facility in this gas generator to realize ignition; excessive high or low oxidizer coefficient is unable to realize ignition, for excessive low oxidizer coefficient contributes to low total temperature and excessive high oxidizer coefficient in same flux results in high flow and flame instability; appropriate time sequence is quite important to ignition.Finally, numerical simulation method has studied the flow field of gas generator with Vee gutter flameholder, Vee gutter installation position, Vee gutter choke ratio and double Vee gutter flameholder design. Results indicate that: the installation of Vee gutter flameholder has a proper range; high choke ratio improves the success rate of ignition; water injection can increase kerosene evaporation rate with a certain extent, however, there exists an optimum amount; choke ratio matching, Vee gutter installation distance and flameholder installation position need to be optimum designed in double Vee gutter flameholder.