Pulse Detonation Engine Fuel Atomization And Nozzle Design

The Pulse Detonation Engine (PDE) is a new type engine which use intermittent detonation as push power. Because of the high combustion efficiency and simple structure features, it is considered to be one of the most potential engine in the 21st century However the PDE requires higher atomization of fuel. It is urgently to study the theory of pressure swirl atomizer and the influence of atomization to the PDE performance. In this paper, we established the VOF method to numerically simulate internal flow field of pressure-swirl atomization and through experiment confirm the feasibility of the VOF method. This paper mainly include three aspects:The First Part:Briefly deduced the maximum flow theory of pressure-swirl atomizer, and established a two dimension and a three dimension model of pressure-swirl atomizer with VOF method;The Second Part:Two-dimensional axi-symmetric numerical simulations have been carried out to study the unsteady, turbulent, swirling two-phase flow field inside pressure swirl atomizers with the volume of fluid (VOF) method. Internal flow field simulation results are validated using available experimental data for velocity measurements inside a large-scale prototype atomizer, the film thickness at orifice exit, the spray angle, and the discharge coefficient. The effect of air pressure and liquid viscosity on flow field inside the atomizer is investigated. The relationship between the internal flow characteristics and discharge parameters confirms that the internal flow structure plays a very important role in determining the atomizer performance.Third Part:This part designed a pressure-swirl atomizer. With the gasoline as the working fluid we studied the relationship between the atomizer's pressure and mass flow rate through the experimental.Used the VOF model to simulate internal flow characteristics of the pressure-swirl atomizer, the result showed that the simulations result meet with the experiments well.