Theoretical Study On The Laser Supported Detonation Wave In Gas Liquid Two Phase Propellant

Because of its good propulsion performance and low breakdown threshold, the laser propulsion in gas liquid two phase propellant has caused the attention of scholars both at home and abroad. And the energy conversion is mainly completed by laser supported detonation wave. So it has significance to carrying on the research of laser supported detonation wave in the gas liquid two phase propellant.Firstly the laser breakdown model of a single water droplet is established, and the influences of incident power density, radius of water droplet and laser wavelength on breakdown characteristics are clarified with a single water droplet as the research object, combined with the Mie scattering model and the electronic speed density equation of breakdown. Secondly the laser supported detonation wave model of gas liquid two phase propellant is established, and change characteristics of main parameters before and after the detonation wave are analyzed, combined with the laser supported detonation wave model of gas propellant and the cloud detonation model. Lastly the ideal power cycle model of laser propulsion with gas-liquid two phase propellant is established, and the factors of energy conversion efficiency are analyzed, by the using of the laser supported detonation wave model of gas liquid two phase propellant.The results show that the ram pressure ratio and the constant volume compression ratio are the main factors of energy conversion efficiency. The increasing of ram pressure ratio or constant volume compression ratio can improve the energy conversion efficiency. The ram pressure ratio increases with the increasing inlet Mach number, and the constant volume compression ratio increases with the increase of laser power density or mass ratio of water to gas. The increasing of mass ratio of water to gas can increase the constant volume compression ratio and then improve the energy conversion efficiency effectively. When the ram pressure ratio π=10and the mass ratio of water to gas increases from f=0to f=10, the energy conversion efficiency increases from ηt=52.5%to ηt=55.8%. The gas-liquid two phase propellant has good prospects for development in the field of laser propulsion.