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단방향 유동구조 연성해석을 활용한 노즐 구조 안전성 검토 연구
이창욱(Changwook Lee),박용석(Yongseok Park),조덕용(DuckYong Jo) 한국추진공학회 2022 한국추진공학회 학술대회논문집 Vol.2022 No.5
스텔스 성능 향상 목적으로 굴곡이 있는 노즐을 사용한다. S-형상의 노즐은 터빈 외부로 노출되는 것을 막을 수 있다. 본 연구에서 복잡한 형상의 노즐 제작 방법으로 5-축 가공을 활용하였고 제작을 수행하기 위해 링 형태로 노즐 분할하여 제작하였다. 링 형태로 제작한 노즐의 구조적 안전성을 검토하기 위해 유동-구조 연성해석을 활용하였다. 유동해석에 사용되는 프로그램은 STAR-CCM+를 사용하여 노즐 내부온도와 압력 분포를 획득하였다. 온도와 압력 분포를 구조해석 경계조건으로 입력하였고 구조해석 프로그램인 NASTRAN을 활용하여 전체 구조의 안전 마진 체결 홀에 대한 국부적인 안전 마진을 계산하여 제작 방법에 대한 타당성을 검증하였다. A curved nozze is used to improve stealth performance. The S-shape nozzle can prevent the turbine from expose to the outside. In this study, five-axis machining was used as a method for manufacturing a nozzle with a complex geometry and the nozzle was divided into a ring shape for manufacturing. To examine the structural safety of a nozzle manufactured in the form of a ring, 1-way fluid structure interaction analysis was used. The program used for fluid dynamics analysis used STAR-CCM+ to obtain nozzle internal temperature and pressure distribution. To determine the validity of the manufacturing method, Temperature and pressure distribution were set as boundary conditions for structural analysis and the overall safety margin and bearing safety margin were calculated using NASTRAN.
이창욱(Changwook Lee),박용석(Yongseok Park),조덕용(DuckYong Jo),최성만(Seong Man Choi) 한국추진공학회 2022 한국추진공학회지 Vol.26 No.5
In this study, 5-axis machining was proposed as a method for manufacturing a nozzle with a curved shape, and flow analysis and structural analysis were used for structural validation of the manufactured geometry. The program used for CFD obtained the internal temperature and pressure distribution of the nozzle using STAR-CCM+ and used it as the boundary condition for structural analysis. For structural analysis, the commercial program NASTRAN was used, and stress was calculated using the von-mises technique. Based on the maximum stress value generated, the safety margin was 0.78 and the safety margin of the bearing stress was 46.8. In addition, the creep life was calculated as 9.97 x 1012 hours using the Larson-Miller parametric method and applying the maximum stress value of 187 MPa and the exhaust gas perfectly mixed temperature of 463 K.