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• W2316262024 abstract "Launch vehicles are employed with core and clustered strap-on boosters as lower stage to provide large thrust during lift-off. Because of these configurations, interaction of multi jets is encountered, especially at high altitudes, due to pluming of jets. The interaction of jets lead to reverse flow towards the vehicle base resulting in base heating and thrust. To evolve design solution to the above problems, clear understanding of the flow field around the base is essential. In the present study, interaction of twinjets emanating from strapon boosters of a generic launch vehicle is studied experimentally in High Altitude Jet Simulation facility (HAJS). The complete flow field is visualized through schlieren photography. Pitot pressure survey along the vehicle axis from the shock inflexion point towards the base revealed the existence of reverse flow, which is predominant in the vicinity of shock inflexion point, diffuses before reaching the base. The base pressure measurements also confirmed the above results. Nomenclature D = Exit diameter of the booster nozzle Me = Booster nozzle exit Mach number O = Origin at the intersection of vehicle axis & booster nozzle exit plane Pb1 = Base pressure at location 1 Pb1 = Base pressure at location 2 (pj/p∞) = nozzle pressure ratio Cpb1 = Base pressure coefficient at port 1      − = ∞ ∞ q p pb1  Cpb2 = Base pressure coefficient at port 2       − = ∞ ∞ q p pb2 pj = Booster nozzle exit pressure pt = Pitot pressure P0 = Settling chamber pressure p∞ = Ambient pressure (corresponding to the altitude) q∞ = Dynamic pressure X = Distance along the vehicle axis Y = Distance along the radial direction γ = Specific heat ratio * Engineers, Aerothermal Test Facilities Division, Vikram Sarabhai Space Centre, Thiruvananthapuram, India $ Head, Aerothermal Test Facilities Division, Vikram Sarabhai Space Centre, Thiruvananthapuram, India American Institute of Aeronautics and Astronautics 1 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit 8 11 July 2007, Cincinnati, OH AIAA 2007-5506 Copyright © 2007 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. Abbreviation HAJS High Altitude Jet Simulation Facility" @default.
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• W2316262024 date "2007-07-08" @default.
• W2316262024 modified "2023-09-24" @default.
• W2316262024 title "HIgh Altitude Jets Interaction and Reverse Flow" @default.
• W2316262024 doi "https://doi.org/10.2514/6.2007-5506" @default.
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