Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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A Computational Study on the Shock Structure and Thrust Performance of a Supersonic Nozzle with Overexpanded Flow

과대팽창이 발생하는 초음속노즐의 충격파 구조와 추력성능에 대한 수치적 연구

  • Bae, Dae Seok (Department of Mechanical Engineering, Pukyong National University) ;
  • Choi, Hyun Ah (Department of Mechanical Engineering, Graduate School, Pukyong National University) ;
  • Kam, Ho Dong (Defense R&D Center, Hanwha Corporation) ;
  • Kim, Jeong Soo (Department of Mechanical Engineering, Pukyong National University)
  • Received : 2014.06.08
  • Accepted : 2014.07.15
  • Published : 2014.08.01
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Abstract

Overexpanded flow of an axisymmetric thruster nozzle is numerically simulated to investigate effects of nozzle pressure ratio (NPR) on the shock structure and thrust performance. The Reynolds-averaged Navier-Stokes equations with k-${\omega}$ SST turbulence model are solved utilizing FLUENT solver. As the NPR is raised, thrust performance monotonically increases with the shock structure and flow-separation point being pushed toward the nozzle exit. It is also discussed that the flow structure at nozzle-exit plane which is immediately affected by a position of nozzle-interior shocks and expansion waves, has strong influence upon the thrust performance of thruster nozzle.

과대팽창이 발생하는 축대칭 초음속 노즐에서 노즐압력비가 충격파 구조와 추력성능에 미치는 영향을 규명하기 위해 지상연소시험평가용 추력기 노즐을 대상으로 수치모사를 수행하였다. k-${\omega}$ SST 난류 모델을 적용한 Reynolds-averaged Navier-Stokes 방정식을 상용코드 FLUENT를 사용하여 해석한 결과, 노즐 압력비가 증가함에 따라 추력성능이 단조적으로 증대되고, 노즐 내부에서 생성된 충격파와 유동박리점이 노즐 출구방향으로 밀려나는 사실을 확인하였다. 또, 노즐내부 충격파와 팽창파 위치의 직접적 영향을 받는 노즐 출구면에서의 유동구조가 추력성능에 미치는 영향도 상세히 조사하였다.

Keywords

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