이중모드 위상도플러 속도계측기법에 의한 소형 액체로켓엔진 인젝터 분무의 가시화

Abstract

Abstract. A focus is given to the breakup behavior of spray droplets issuing from a nonimpinging-typeinjector. The analysis has been carried out experimentally by means of the dual-mode phase Doppler ane-mometry (DPDA). Spray characteristic parameters in terms of axial velocity, mean diameter, velocity fluc-tuation, and span (width of the size distribution) of droplets are measured down the geometric axis ofa nozzle orifice and on the plane normal to the spray stream with the injection pressure variations. Asthe injection pressure increases, the velocity and its fluctuation become higher, whereas the droplet sizesget smaller. It is also shown that the magnitudes of those parameters are smoothed out by dispersion whenthe droplets move downstream as well as outwardly. The atomization process is significantly influencedby the injection pressure rather than the traveling distance in the experimental condition presented. Key Words: Liquid-rocket Engine(액체로켓엔진), Injector(인젝터), Spray Droplet(분무액적), Dual-modePhase Doppler Anemometry(이중모드 위상도플러속도계)