The Structure Design And Strength Analysis Of Pulse Detonation Engine

Pulse Detonation Engine (PDE) is a new generation of propulsion system based on the principle of high-efficiency pulse detonating combustion, which features the quality of high efficiency of heat engine, simplified structure, low specific fuel consumption and powerful propulsion, that it broadens the perspectives of prevailing deployment around all kinds of scenarios. It absorbs the configuration as a new main stream of developing the future atmospheric and spatial traveling vehicles.Researching plant was chosen as the aerovalve two-phase pulse detonation engine, for analyzing the aerovalve two-phase pulse detonation engine ignition crucial techniques and several component functionalities. Detonation wave's pressure, velocities and detonation tube's temperature distribution tests schemes were devised. Testing result illustrates that (1) PDE works stably by means of intermittent duty. (2) A temperature distribution heat equilibrium time exists at the external wall of PDE. (3) Average pressure of 1.5 MPa and average speed of 700 m/s of detonation wave were measured and detected during the test. Based on the experimental data, Maximum von Mises stress of 57 MPa is extracted after the static strength computation. Mode analysis shows the PDE working natural frequency and mode of vibration, which helps to avoid the resonance. Harmonic Response Analysis points out that damping ratio effects the high order frequency enormously and reduces the amplitude of harmonic response. Transient Structure Response computation validates the PDE working security. A single rotating-valve dual-bypass PDE prototype is designed constructed on the corresponding principle, which functions by spinning the valve to facilitate the air intake turning on and off alternatively and realizing the PDE collaborating operation. Material selection is guided by the static strength of single rotational valve PDE key component, which carried out aerodynamic simulation result.Nowadays, researches at home and abroad focus scarcely on the strength and structural response of the pulse detonation engine. This paper proposed the analysis method on the strength and dynamics of PDE, which is the first attempt in China. The method is used to verify the safety of the pulse detonation engine and provide technical reserve for its structural optimization design, which is believable to be significant for the application of PDE.