Performance Analysis And Regulation Characteristic Of Pulse Detonation Engine

The differences among ideal detonation cycle, Humprey cycle and Brayton cycle wereanalysized. Because of unsteady work characteristics of pulse detonation engine (PDE), theconcept of cycle factor that represents the ratio of air quantity for detonation combustion toincoming air quantity was defined to analyze the influence of the mass distribution on theperformance of ideal air-breathing pulse detonation engine (APDE), the results of which werealso compared with that of conventional steady engine. To investigate the influence of partialfilling on the performance of ideal APDE, an ideal partial filling detonation cycle wasestablished. Although the partial filling decreases the total thermal cycle efficiency, it can beused to enhance the propulsive performance.Since the performance model of ideal pulse detonation engine can only be used toevaluate the maximal performance, the full filling and partial filling performance models weresummarized for the PDE with straight tube detonation chamber. The performance trends ofPDE with C₈H₁₈-Air and H₂-Air were computed and compared with the ideal performance.Experiments of PDE setup were conducted to verify the accuracy of the models. It was shownthat the normalized partial filling performance model was more popular. The performancemodel of PDE with converge-diverge nozzle was established by characteristic method andhomogeneous method of detonation chamber parameters, the results of which were consistentwith the trends of experimental data.By introducing the inlet and overflow bypass, the above O-dimensional performancemodels can be used to establish the performance model of APDE. The influences of flightaltitude, flight Mach number, equivalence ratio and fill factor on the performance of APDEs,designed for both subsonic and supersonic flight, were researched. Based on model resultsand experimental data, the control characteristics of APDE were analyzed and the possiblecontrol rules of APDE were proposed.The performance model of one-dimensional numerical simulations was carried out tosimulate the real work process of PDE, and the accuracy of the model was verified on thesimulation of single-cycle PDE. Two APDE configurations were explored by using this model:one is APDE with bypass and separate exhaust, the other is APDE with bypass and mixexhaust. The results shown that the introduction of overflow bypass can weaken the influenceof state change of detonation chamber on the operation performance of inlet and decrease thenecessary volume of the acoustic chamber at the downstream of the inlet. If the configurationof APDE is reasonable, the propulsive efficiency of APDE can be greatly enhanced when theflow in the bypass were mixed with the high temperature combustion products.