화학공학소재연구정보센터
Atomization and Sprays, Vol.27, No.2, 139-149, 2017
NUMERICAL STUDY OF A SELF-PULSATING INJECTOR
This paper presents a simulation study of the internal flow of a self -pulsating injector adapted from the design of the Coanda-effect bistable feedback fluidic oscillator. The computational fluid dynamics (CFD) method is used to study the effects of geometric parameters on pulsation characteristics. The influence of four factors on the oscillatory flow field is examined: the specific value of the outlet height to the joint inlet height (a), the specific value of the length to the height of the amplifier channel (13), the inlet velocity (14), and the fluid material. Focus is concentrated on the influence of these factors on oscillation frequency and amplitude. It is found that the variation of both oscillation frequency and amplitude with inlet velocity is independent of fluid material. The effects of geometric change on the oscillator are presented, which are of instructive significance for the practical design of a self-pulsating injector. In addition, the linear response regime, where oscillation frequency is perfectly linear with respect to Reynolds number, is successfully reproduced in these simulations.