Design And Research On The Ramjet Engine With Trapped-vortex Combustor

The liquid ramjet engine has the advantage in specific impulse, economy and range. In order toobtain high combustion efficiency, a new concept ramjet engine with trapped-vortex combustor wasdesigned and experimented. Firstly, the total program of ramjet engine with trapped vortexcombustor was designed, and then the designs of flame stabilization system, fuel supply system,ignition program and thermal protection system were carried out. The flame stabilization systemincluding trapped-vortex cavity flameholder, radial V-gutter flameholder. The fuel for trapped-vortexcavity flameholder was supplied by splash-plate platelet injector independently. In the mainstream,the fuel was supplied by two partial pressure rods, which were called main fuel rod and secondaryfuel rod separately. Spark plug ignition was used to ignite the combustor.The flow distribution, the cold flow field, the oil distribution and the temperature of the ramjetcombustor were obtained by numerical simulation. From the numerical simulation results, we candetermine that the design of ramjet combustor is feasible.The experimental results have shown that as the inlet velocity coefficient increases, the totalpressure loss increases, and the fuel air ratio of ignition and lean blowout increases. With the increase inthe inlet temperature, the fuel air ratio of the ignition and lean blowout decreases. The minimum ignitionfuel air ratio is0.0035, and the minimum lean blowout fuel air ratio is0.0028. With the overall excess aircoefficient increase, the combustion efficiency increases. The change of equivalence ratio oftrapped-vortex cavity flameholder has little influence on the combustion efficiency of ramjet combustor.Finally, the structural design of the ramjet combustor was completed so that it can be feasible inengineering.