한국추진공학회:학술대회논문집 (Proceedings of the Korean Society of Propulsion Engineers Conference)
- 한국추진공학회 2008년도 제31회 추계학술대회논문집
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- Pages.78-81
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- 2008
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- 1975-342X(pISSN)
A Computational Study on the Unsteady Lateral Loads in a Rocket Nozzle
- ;
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김희동
(안동대)
- Nagdewe, Suryakant (School of Mechanical Engineering, ANU) ;
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Kim, Heuy-Dong
(School of Mechanical Engineering, ANU)
- 발행 : 2008.11.13
초록
A numerical study of the unsteady flow in an over-expanded thrust optimized contour and compressed truncated perfect rocket nozzle is carried out in present paper. These rocket nozzles are subject to flow separation in transient phase at engine start-up and/or engine shut-down. The separation flow structures at different pressure ratios are observed. The start-up process exhibits two different shock structures such as FSS (Free Shock Separation) and RSS (Restricted Shock Separation). For a range of pressure ratios, hysteresis phenomenon occurs between these two separation patterns. A three-dimension compressible Navier-Stokes solver is used for the present study. One equation Spalart-Allmaras turbulence model is selected. The computed nozzle wall pressures show a good agreement with the experimental measurements. Present results have shown that present code can be used for the analysis of the transient flows in nozzle.