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관통형 핀틀 노즐의 박리유동 해석을 위한 격자규모, 난류모델 및 공간 정확도의 평가와 선정
정기연(K.Y. Jeong),강동기(D.G. Kang),이대연(D.Y. Lee),김덕현(D.H. Kim) 한국전산유체공학회 2017 한국전산유체공학회지 Vol.22 No.3
Assessment and validation of RANS turbulence models have been conducted for the separation flow in through-type pintle nozzle through the comparison between computational results and experimental results. Models of pintle nozzle and numerical conditions are selected from preceding research. The separation flow occurred in nozzle flow because of shock wave of pintle. Precision simulation of separation flow in pintle nozzle is important to analyze the dynamic characteristics and nozzle thrust. The simulation tests of grid dependency and turbulent model are conducted to determine the proper method of pintle nozzle analysis. Each results are compared with experimental data. Grid dependency simulation is set up by changing the base size of grid between 0.6mm and 0.09mm. Turbulent models are selected from Spalart-Allmaras, κ -ε and κ -ω model that be used in general. Through this study, proper numerical simulation method of pintle nozzle will be suggested.
정기연(Kiyeon Jeong),홍지석(Ji-Seok Hong),허준영(Junyoung Heo),성홍계(Hong-Gye Sung),양준서(Juneseo Yang),하동성(Dongsung Ha) 한국추진공학회 2016 한국추진공학회지 Vol.20 No.4
Numerical simulations have been performed to investigate thrust characteristics of a through-type pintle nozzle with or without flow separation at various operating altitudes. The low Reynolds number k-ε with compressibility correction proposed by Sarkar are applied. The detail flow structures are observed and static pressures along nozzle wall are compared with experimental results. The flow separation in the pintle nozzle disappears and jet plume strongly expands as its operating altitude increases. To evaluate the thrust characteristics, the momentum term and pressure term of thrust are analyzed. Thrust and thrust coefficient at altitude 20 km are about 10% more than them at the ground 0km.