입자 특성에 따른 고체모터 플룸 이상유동 해석
Two phase analysis of solid rocket motor plume as particle characteristics
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초록
알루미나 입자가 포함된 KSLV-I KM 고공 플룸 유동을 연소실에서 노즐 출구의 고공 팽창과정을 해석하였다. 알루미나 입자 및 플룸 가스의 물성치 및 분포를 달리하여 해석한 결과 연소가스 비열비를 1.2로 알루미나 입자의 직경 분포를 7가지로 가정하면 노즐 내부 유동 특성이 평형유동 해석 결과와 비교적 일치하였다. 입자의 팽창각은 가스유동보다 작으며 입자 직경이 클수록 팽창각은 더 작았다. 알루미나 입자의 광학 열물성을 변화시키며 KM TVC 분배기 위치의 복사열을 계산한 결과 알루미나 입자의 방사율이 0.1일 때 비행시험 결과와 비슷한 수준을 예측하였다.
Abstract
KSLV-I KM plume including alumina particle has been studied using the continuum solver. Alumina particles are assumed to have 7 different diameters, and the specific ratio of the plume gas is assumed to be 1.2, with which the internal nozzle flow characteristics are similar to those of the chemically equilibrium analysis results. The results showed that the expansion angle of the particles is smaller than that of the gas phase, and that the big sized alumina particles are gathered in the plume core and the expansion angles of the big sized paticles are smaller than those of the light particles. When the emissivity of the particles are assumed to be 0.1, the radiative heat flux is equivalent to those measured during the flight test of KSLV-I.
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