기저부 유동 및 난류가 다단 로켓의 단 분리 운동에 미치는 영향 = Effect of base flow and turblulence on the separation motion of strap-on rocket boosters

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고순흠; 김재관; 한상호; 김진호; 김종암
Issue Date
한국전산유체공학회 = Korean Society of Computational Fluids Engineering
한국전산유체공학회 2007년도 춘계학술대회논문집, 2007. 4., pp.83-86
보조 부스터(strap-on rocket boosters)단 분리 운동(separation motion)겹침 격자 기법(overset mesh technique)기저부 유동(base flow)k-ε SST 난류 모델(k-ε SST turbulence model)Spalart-Allmaras 난류 모델(Spalart-Allmaras turbulence model)KSR-IIITitan-IV
Turbulent flow analysis is conducted around the multi-stage launch vehicle including base region and detachment motion of strap-on boosters due to resultant aerodynamic forces and gravity is simulated. Aerodynamic solution procedure is coupled with rigid body dynamics for the prediction of separation behavior. An overset mesh technique is adopted to achieve maximum efficiency in simulation relative motion of bodies and various turbulence models are implemented on the flow solver to predict the aerodynamic forces accurately. At first, some preliminary studies are conducted to show the importance of base flow for the exact prediction of detachment motion and to find the most suitable turbulence model for the simulation of launch vehicle configurations. And then, developed solver is applied to the simulation of KSR-III, a three-stage sounding rocket researched in Korea. From the analyses, after-body flowfield strongly affects the separation motion of strap-on boosters. Negative pitching moment at initial stage is gradually recovered and a strap-on finally results in a safe separation, while fore-body analysis shows collision phenomena between core rocket and booster. And a slight variation of motion is observed from the comparison between inviscid and turbulent analyses. Change of separation trajectory based on viscous effects is just a few percent and therefore, inviscid analysis is sufficient for the simulation of separation motion if the study is focused only on the movement of strap-ons.
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Mechanical Aerospace Engineering (기계항공공학부)Others_기계항공공학부
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