The Effect of Swirl Injector Design on Swirl Number and Spray

Abstract

Referring TFE1042-70 fuel nozzle design this study utilizes a simple swirling fuel injector which consisted of a swirl chamber a spin chamber and an exit orifice part to analyze the effect of some design parameters on fuel spray In addition an angled guide vane is installed outside the fuel injector to create air vortex to complete an airblast injector design The design parameters of swirling fuel injector are the number of fuel injection port for the swirler (two ports four ports) and the L/D of exit orifice part (L/D=4 2 L/D=2 5) Swirl number calculated from CFD simulation results is used as a quantified variable to characterize the injector operation The results show that the increasing of fuel flow rate from 1 g/s to 10 g/s reducing fuel injection ports of swirler and L/D of exit part will increase swirl number And smaller SMD shorter breaking distance higher spray speed and larger atomization angle are appeared at larger swirl numbers In the experiment of interaction between air vortex and inner fuel spray the liquid mass flow rate is set to be 3 g/s and the supply pressure drop of the outer air is from 0 psi to 15 psi The results show that adding air vortex significantly increases the spray angle and uniformity of the spray distribution and also creates smaller SMD

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