The Studies Of Application The Method Of Conservation Element And Solution Element On The Calculation Of Gas/Liquid Two-Phase Detonation Flow Field In Pulse Detonation Engine

Pulse detonation engine (PDE) is a novel engine which produces periodic impulse by utilizing repetitive detonation. It has several advantages in simple structure, high thermodynamic cycle efficiency, units of low fuel consumption and wide working scope, which make it widely-used in both military and civilian field as a new-style thruster system. In this dissertation, two-phase detonation governing equations are built according to the characteristic of the two-phase detonation flow field. Use the method of conservation element and solution element (the CE/SE method) to solve the governing equations. The main contents of this dissertation are as follows:(1) The one-dimensional CE/SE method is deduced to calculate one-dimensional two-phase flow field inside PDE. The corresponding program is written. The parameters of one-dimensional detonation are obtained. The calculation results show that the CE/SE method could efficiently capture strong discontinuity such as detonation wave.(2) The two-dimensional inviscid CE/SE method is deduced to simulate the axial-symmetry, inviscid detonation flow field inside PDE. The corresponding numerical calculation program is written. The characteristics of the interior flow field in PDE are studied, and how the distribution of droplets and the different of the ignition temperature and pressure to affect the deflagration to detonation are studied. The calculation results show that the higher the ignition temperature and pressure are, the smaller the gasoline radius is after atomization, which is more propitious to realize deflagration to detonation.(3) The two-dimensional viscous and turbulent CE/SE methods are deduced to simulate the axial-symmetry, viscous and turbulent flow field inside PDE. The corresponding programs are written. The characteristics of the viscous and turbulent two-phase flow field inside PDE have been obtained. The two-phase detonation flow field considering the obstacles inside PDE is studied. How different number of the obstacles pieces and different distance between the pieces to affect the deflagration to detonation are analyzed. The calculation results show that using the viscous and turbulent model to describe the two-phase detonation flow field is better than using the inviscid modle. The viscous and turbulent flow fields much more accord with the genuine flow field. The results show that the obstacles could efficiently promote the progress of deflagration to detonation.(4) The three-dimensional inviscid CE/SE method is deduced to simulate the inviscid two-phase flow field inside PDE. The corresponding calculation program is written. The characteristics of two-phase three-dimensional detonation flow field are obtained. It is found that three-dimensional effect in the tube is obvious in the deflagration to detonation stage. The dissertation detailedly depicts the feature of three-dimensional detonation wave structure in the progress of deflagration to detonation.(5) The three-dimensional viscous CE/SE method is deduced to simulate the viscous flow field inside PDE. The corresponding numerical calculation program is made. The characteristics of the viscous two-phase flow field inside the PDE are obtained. It is nicer to describe the three-dimensional detonation flow field when considering the viscous effect and to depict the three-dimensional structure of detonation wave especially in the near wall region.(6) The experiments of air breathing PDE which uses gasoline as fuel are performed. Successfully got the detonation wave of three frequency 33Hz,40Hz,50Hz. Pressure histories under three kinds frequency are obtained and how the air-intake pressure affects the PDE working performance is studied, which provide the calculation results with the validation.