Effect of aerospike on unsteady transonic flow over a blunt body

Gireesh, Yanamashetti and Singh, DB and Suryanarayana, GK and Mukherjee, Rinku (2021) Effect of aerospike on unsteady transonic flow over a blunt body. Journal of Spacecraft and Rockets, 58 (6). pp. 1806-1818. ISSN 00224650

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Official URL: https://arc.aiaa.org/doi/10.2514/1.A34928


Blunt-nosed launch vehicles featuring large nose-cone angles experience high levels of pressure fluctuations over the payload region at transonic Mach numbers due to shock-wave/boundary-layer interactions. The main cause for this phenomenon appears to be flow instability associated with separated flow and formation of a vortex pair. Interactions between the induced velocity of the vortex pair and oncoming mean flow cause oscillations of the λ-shock system and high levels of fluctuating pressures. An aerospike causes flow separation at the nose and reattachment of the shear layer downstream, energizing the boundary layer. Consequently, flow separation and vortex formation are prevented: shock oscillations are stabilized. Dramatic reductions in the pressure fluctuations, around 95–35% in the low-frequency range, are observed along the payload region at small angles of attack. The observations are based on wind-tunnel tests involving unsteady pressure measurements, surface-flow patterns, and high-speed shadowgraph recordings on a blunt nose cone with various cone angles.

Item Type: Article
Uncontrolled Keywords: Unsteady Transonic Flow, Aerodynamic Characteristics, Boundary Layer Interaction, Vortex Shedding, Launch Vehicle Configurations,Shock Waves, Angle of Attack, Wind Tunnel Tests, Direct Numerical Simulation, Adverse Pressure Gradient
Subjects: AERONAUTICS > Aerodynamics
ENGINEERING > Fluid Mechanics and Thermodynamics
Depositing User: Smt Bhagya Rekha KA
Date Deposited: 27 Dec 2022 15:00
Last Modified: 27 Dec 2022 15:00
URI: http://nal-ir.nal.res.in/id/eprint/13804

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