Unsteady 1-D Thrust Modeling with EOS Effects for Ram Accelerator Experiments at Different Bores

Aerotecnica Missili & Spazio

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Title Unsteady 1-D Thrust Modeling with EOS Effects for Ram Accelerator Experiments at Different Bores
Creator Knowlen, Carl
Bauer, Pascal
Bengherbia, Tarek
Yao, Yufeng
Bruckner, Adam P
Giraud, Marc

Description Advances made to the unsteady, one-dimensional (1-D) modeling of the thermally choked ram accelerator thrust-Mach number characteristics include the use of real-gas equations of state to account for the compressibility eects of the combustion products. Equations of state based on generalized empirical and theoretical considerations are incorporated into a 1-D computer code to predict the combustion end  tate equilibrium conditions when the propellant starts out a relatively high fill pressure (>2.5 MPa) and the projectile acceleration exceeds 100 km/s2. The objective of this work is to improve the unsteady 1-D model as a useful tool to predict the thrust of the thermally choked ram accelerator propulsive mode by utilizing key results from the more computationally intensive 2-D or 3-D simulations. New thrust-Mach number calculations compared with experimental data from 25-mm, 30-mm, 38-mm, 90-mm, and 120-mm-bore experiments are generally in good agreement until the point where enhanced accelerations are observed, presumably due to projectile material combustion. The results of this investigation indicate the need for more research on ram accelerator  flow fields and the role projectile material may play in the combustion process.
Publisher Associazione Italiana di Aeronautica e Astronautica (AIDAA)
Date 2018-07-11
Type info:eu-repo/semantics/article
Peer-reviewed Article

Format application/pdf
Source Aerotecnica Missili & Spazio; Vol 97, No 1 (2018); 19-26
Language eng
Rights Copyright (c) 2018 Aerotecnica Missili & Spazio

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