Combustion Of Solid Fuel In Supersonic Flows

Solid fuel scramjet,of which the cost is lower,has simple mechanism,better security and higher energy density,which is the choice for some missions.However,study of solid fuel scramjet is still in initial stage and theories and experiments of it are few.Cavity used in solid fuel scramjet is contributed to realize ignition and stabilize flame.The solid fuel surface will regress in the combustion and the cavity will disappear,which leads to the extinction.Thus,the capability of cavity of holding flame of solid fuel scramjet is weak.To study solid fuel scramjet with cavity,the dissertation employs appropriate simulation models and builds mathematical models including turbulence and combustion models and solid fuel regression models.Then proves the reliability and accuracy of simulation models by case verification with both reaction and non-reaction.The dissertation employs back-step configuration to study the effects of positions and heights of solid fuel on mixing and combustion by simulation.Meanwhile,conduct a deep analysis of solid fuel scramjet combustor.Put forward an idea that substitute cavity for high temperature fuel-rich gas to realize ignition and stabilize flame.Then compare the performance of the two combustor by theory analysis and simulation.The dissertation also studies the impacts of parameters of fuel-rich gas on the flow.Build the unsteady numerical method with moving grid.Conduct a study in solid fuel scramjet with cavity by the unsteady numerical method.Verify the reliability and accuracy of unsteady numerical models by comparison of results of simulation and experiment.Then conduct a study in solid fuel scramjet with gas generator by the unsteady numerical method.