Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Bulging Process of Liquid Rocket Combustion Chamber Nozzle

액체로켓 연소기 노즐의 벌징 공정

  • 류철성 (한국항공우주연구원 연소기팀) ;
  • 최환석 (한국항공우주연구원 연소기팀)
  • Published : 2008.03.01
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Abstract

A study has been conducted on the bulging process of liquid rocket engine nozzle which is essential to the manufacturing regenerative cooling combustion chamber. Mechanical properties of the material used for the bulging were experimentally obtained by tension tests. Deformation of the bulged nozzle was confirmed by a structural analysis. The developed bulging process and the deformation analysis result were confirmed by manufacturing of the bulged nozzle specimens and the bulging test. There has been a bulging failure among 7 bulged specimens due to the necking of the material. The cause of necking was investigated by comparing microstructure of the material. The investigation has revealed grain size of the material has considerable effect on the occurrence of the necking.

액체로켓 연소기 재생냉각 챔버 제작에 필수적인 노즐의 벌징 공정에 대한 연구를 수행하였다. 벌징 공정에 사용되는 재료의 기계적인 특성은 재료시험을 통하여 획득하였다. 벌징노즐의 벌징 후 형상 변화는 변형해석을 통하여 확인하였다. 벌징 공정 및 변형해석의 검증은 벌징노즐 시편을 제작하고, 벌징 시험을 수행하여 확인하였다. 노즐 벌징 수행 결과 총 7개의 시제 중 1개의 시제에서 소재에 네킹이 발생하여 파손되었다. 벌징 공정 중에 발생된 네킹의 원인 분석은 재료의 조직분석을 통하여 수행하였다. 조직분석 결과 재료의 그레인 사이즈가 네킹 발생에 큰 영향을 미침을 확인하였다.

Keywords

References

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Cited by

  1. Development of Spinning Process for Manufacturing Liquid Rocket Engine Thrust Chamber vol.18, pp.6, 2014, https://doi.org/10.6108/KSPE.2014.18.6.088
  2. Finite Element Simulation on Superplastic Forming of Outer Jacket of Combustion Chamber vol.433, pp.1662-9795, 2010, https://doi.org/10.4028/www.scientific.net/KEM.433.219