Effect of freestream-jet plume interaction on aerodynamic coefficients with different flared aft-bodies

Desikan, S. L. N.; Suresh, K.; Saravanan, R.; Chandrasekar, N.; Patil, M. M.; Pandian, S.

doi:10.1016/j.expthermflusci.2016.09.006

Cited by 4 publications

(1 citation statement)

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“…In the interstage thermal separation process, the key features of the flow field are the formation of unstable wave system structures in the interstage region by the upperstage engine jet, the interference flow of the lateral jet in the interstage gap, the external supersonic incoming flow, and the severe aerothermal environment instigated by these elements. When separation occurs at a lower altitude, the interaction between the exhaust plume and free stream causes lateral interference, leading to potential aerodynamic issues, such as diminished stability, localized overheating, and reduced control effectiveness [9][10][11][12]. These circumstances trigger substantial shifts in the rocket's attitude, impacting the safety and flight stability of the interstage separation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Influence of Separation Time Sequence on the Initial Thermal Separation

Ma,

Wang,

2024

Energies

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The process of separating stages is crucial for multistage rockets, directly influencing the success of the launch plan. Different separation timing methods alter the flow field structure within the interlevel zone at separation, influencing the separation of the two-stage rockets. This paper employs the SST k-ω turbulence model to investigate the structure of the flow field and its aerodynamic and motion characteristics under different nozzle baffle opening and separation times, taking into account variable properties, supersonic compressibility, and the upstream–downstream interference. First, we examined the standard flow field structure, considering the engine jet, the lateral jet between stages, and the disturbance from the external supersonic inflow. Then, we discussed the displacement characteristics and axial force coefficient curves of the first and second steps of the separation process. Finally, we explored the impact of baffle opening and separation times on the flow field structure and axial force coefficients of the two stages at the onset of separation. For the flow field structure, a delay in the baffle opening and separation moment led to a gradual increase in downstream and separation regions until they stabilized after a certain range. However, the axial force coefficients displayed different behavior before and after the design point.

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Section: Introductionmentioning

confidence: 99%