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

Chenhui Ma, Sihang Wang and Jianyang Yu ()
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Chenhui Ma: School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
Sihang Wang: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Jianyang Yu: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Energies, 2024, vol. 17, issue 7, 1-18

Abstract: 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.

Keywords: hot stage separation; plume; rocket; numerical simulation; flow separation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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