Effect of Nozzle Divergence Angle on Plume Expansion In Outer-Space Conditions

A, Bhagat and Mopuru, D R and Dongari, Nishanth and Saraswat, V K (2015) Effect of Nozzle Divergence Angle on Plume Expansion In Outer-Space Conditions. In: Proceedings of the 23rd National Heat and Mass Transfer Conference AND 1st International ISHMT-ASTFE Heat and Mass Transfer Conference IHMTC201, 17-20 December, 2015, Thiruvananthapuram, India.

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We carry out numerical simulations to investigate the effect of nozzle divergence angle on back flow of plume expansion into rarefied atmosphere. Results are obtained using open source compressible computational fluid dynamics (CFD) solver. Non-equilibrium slip and jump boundary conditions for velocity and temperature are implemented to capture rarefaction rarefaction effects in the slip flow regime. The solver has been validated with the experimental data for a nozzle flow in the slip flow regime. We explore the non-linear non-equilibrium gas flow physics of a supersonic jet expansion. We report results of pressure, heat and drag coefficients for different divergent angles ( 12 0 , 15 0 and 20 0 ) at 80 km altitude conditions. The slip based results for heat loads significantly under-predict the no-slip ones, while for pressure and drag coefficients, deviations are found to be minute. It is noticed that thrust coefficient of nozzle increases with increase in divergence angle, however, nozzle with divergent angle of 15 0 led to minimum drag and heat transfer load on the critical region. The current study is important from the perspective of the overall aero-thermodynamic design of a typical supersonic rocket model operating under rarefied conditions.

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IITH Creators:
IITH CreatorsORCiD
Dongari, NishanthUNSPECIFIED
Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: divergence angle, backflow, plume expansion
Subjects: Physics > Mechanical and aerospace
Others > Space research
Divisions: Department of Physics
Depositing User: Team Library
Date Deposited: 10 May 2016 08:22
Last Modified: 01 Sep 2017 11:05
URI: http://raiith.iith.ac.in/id/eprint/2341
Publisher URL:
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