Abstract
듀얼 벨 노즐은 고도 보정 노즐의 일종으로 일반적인 벨 노즐의 탈설계점에서의 비추력 손실을 최소화할 수 있는 노즐이다. 본 논문에서는 팽창비가 고정된 듀얼 벨 노즐의 천이특성을 파악하기 위하여 전산수치해석을 수행하였다. 주요 설계변수로는 확장부 길이와 변곡각 크기를 선정하였다. 확장부 길이가 증가할수록 천이고도 및 천이지속시간은 증가하였고, 추력계수 감소폭은 감소하였다. 변곡각 크기가 증가할수록 천이고도 및 천이지속시간은 감소하였고, 추력계수 감소폭은 증가하였다. Dual bell nozzle is a type of altitude compensation nozzle, which is a nozzle that minimize the losses of the specific impulse at the off-design point of a typical bell nozzle. In this paper, numerical computations are performed to understand the transition characteristics of dual bell nozzles with fixed expansion ratios. The major design variables are the length of extension and the angle of inflection. As the length of the extension increased, the transition altitude and transition duration increased and the reduction of the thrust coefficient decreased. As the angle of inflection increased, the transition altitude and transition duration decreased and the reduction of the thrust coefficient increased.
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