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Numerical simulation of the nozzle and ejector effect on the performance of a pulse detonation engine

Wang Zhiwu (Northwestern Polytechnical University, School of Power and Energy, Xi’an, China)
Liu Xing (Northwestern Polytechnical University, School of Power and Energy, Xi’an, China)
Wang Yaqi (Northwestern Polytechnical University, School of Power and Energy, Xi’an, China)
Li Hongwei (Northwestern Polytechnical University, School of Power and Energy, Xi’an, China)
Zhang Kun (Avic Xi’an Aero-Engine (group) LTD., Xi’an, China)
Zheng Longxi (Northwestern Polytechnical University, School of Power and Energy, Xi’an, China)

Single-shot pulse detonation engine (PDE) with three different types of nozzles-straight ejector combinational structures at three different ejector positions were simulated by the unsteady 2-D axisymmetric method. Three types of nozzles included the straight nozzle, convergent nozzle and convergent-divergent nozzle. Propane was used as the fuel and air as the oxidizer. The simulation results indicated that the PDE with a straight nozzle and PDE with a convergent-divergent nozzle obtained improved performance when an ejector was added at all of the three ejector positions (x /d = –1, 0 and +1), and PDE with a convergent-divergent nozzle gained the larger improved performance at all the three ejector positions. The PDE with a convergent nozzle-ejector combinational structure obtained the slightly worse performance at the ejector position of x /d = –1, gained the slightly increased performance at the ejector position of x/d = 0, and achieved the largest impulse augmentation and the second largest ejection ratio at the ejector position of x /d = +1 among all of the nine cases of the nozzle-ejector combinational structures. Ejector position of x /d = +1 was the best ejection position at which the PDE with a convergent nozzle-ejector combinational structure achieved the best propulsion performance, ejector position of x /d = –1 was the best ejector position for the PDE with a convergent-divergent nozzle-ejector combinational structure, and ejector position of x /d = 0 was the best ejector position for the PDE with a straight nozzle-ejector combinational structure.

Keywords: ejector, nozzle, numerical simulation, performance, numerical simulation