Hot-firing Test Results of Subscale Gas Generator for 75 ton-class Liquid Rocket Engine

75톤급 액체로켓엔진 축소형 가스발생기 연소시험 결과

A subscale gas generator was designed and manufactured to investigate the effect of design parameters on discharge coefficients of injectors for a 75 ton-class gas generator and hot-firing tests were successfully performed. The test results showed that discharge coefficients of fuel and liquid oxygen injectors remained nearly constant irrespective of variations of a mixture ratio and a chamber pressure. When the post diameter of the liquid oxygen injector was reduced, the discharge coefficient was increased as the pressure drop of the injector was decreased.

75톤급 가스발생기 개발을 위한 분사기의 설계 변수에 따른 유량계수의 영향을 파악하기 위하여 축소형 가스발생기를 설계, 제작하였으며, 연소시험을 성공적으로 수행하였다. 연소시험 결과 연료 및 산화제 분사기의 유량계수는 혼합비와 연소압에 상관없이 거의 일정한 것으로 나타났으며, 산화제 분사기의 노즐 지름을 줄인 경우 분사기 차압이 줄어들어 유량계수가 증가하는 것을 확인하였다.