물 분사기법 적용에 따른 항공기 노즐의 유동 특성 해석

Abstract

Modern weapon systems require stealth technology to avoid detection by enemy and successfully carry out missions. Among them, IR stealth technology, which increases the success rate of the mission by reducing IR signals, has been studied in various methods, and in particular, the particle injection techniques can effectively reduce IR signals through shielding and cooling effects. In this study, the characteristics of flow and particles by injecting water mist were analyzed to study the feasibility of injection techniques for reducing aircraft plume IR signals. The water spray was simulated by applying a multiphase fluid model, the discrete phase model (DPM) method, and the characteristics and temperature changes according to the flow rate were studied. We first investigated the effects of water mist, and then selected the amount of water mist that minimizes the change of the thrust line, and finally checked the change in the flow field due to the behavior and evaporation of water droplets.