The Autoignition Mechanism of Liquid Cyclonic Injector

Abstract

W2 is a kind of kerosene-base fuel with catalyst and it can react with hydrogen peroxide as a hypergolic propellant combination An injector which is called liquid cyclonic injector is developed for this propellant combination However the ignition delay of this injector is unstable In this research the droplet test is designed to study the ignition mechanism of the injector to improve the ignition delay of this injector The drop test observation shows the droplet of W2 from impacting the hydrogen peroxide liquid film to ignition can be divided to three steps: impact splash liquid catalytic reaction and gaseous ignition reaction The area of the impact crater which is affected by the momentum of the W2 droplet affects the heat release rate from liquid catalytic reaction and leading the gaseous ignition reaction It is the main factor controlling the ignition delay time When the area is too large the local concentration of W2 is too low to reduce the heat release rate of the local catalyst reaction and increase the ignition delay The result of the droplet contact experiment is used to improve the design of the liquid cyclonic injector The spray angle of the W2 increases to increase the normal momentum of W2 spray impacting hydrogen peroxide liquid film The result shows the ignition delay is shorten from 3052 44 ms to 582 10 ms The design concept is verified by the result

Date of Award	2020
Original language	English
Supervisor	Hsiao-Feng Yuan (Supervisor)