Equations of state implementation for 1–D modelling of performance in ram accelerator thermally choked propulsion mode. (1st January 2015)

• Record Type: Journal Article
• Authors: Bauer, Pascal; Bengherbia, Tarek; Knowlen, Carl; Bruckner, Adam; Yao, Yufeng; Giraud, Marc
• Is Part Of: International journal of engineering systems modelling and simulation. Volume 7:Number 2(2015)
• Page Start: 71
• Page End: 79
• Publication Date: 2015-01-01
• Subjects: detonation -- equations of state -- EoS -- ram accelerator -- RAMAC -- propulsion -- scale effects -- thermally choked mode -- 1D modelling -- sub–detonative velocity -- compressibility effects -- combustion products -- unsteady models -- shock–induced combustion -- projectile velocity -- supersonic speed -- gaseous combustible mixtures -- computational fluid dynamics -- CFD; Engineering systems -- Computer simulation -- Periodicals; Engineering systems -- Mathematical models -- Periodicals; 620.0042
• DOI: 10.1504/IJESMS.2015.068650
• Languages: English
• ISSNs: 1755-9758

Abstract

This paper presents advancement on one–dimensional (1–D) unsteady modelling of a ram accelerator (RAMAC) in the sub–detonative velocity regime by including real–gas equations of state (EoS) in order to account for the compressibility effects of the combustion products. Several equations of state based on generalised empirical and theoretical considerations are incorporated into a 1–D computer code TARAM. The objective of this work is to provide the best available formulations in order to improve the unsteady 1–D model and make the TARAM code a useful tool to predict the performance of the RAMAC in the sub–detonative velocity regime, without having to resort to more complicated 2–D or 3–D computational schemes. The calculations are validated against experimental data from 38–mm and 90–mm–bore facilities and good agreements have been achieved. Yet, the results demonstrate the need for further CFD studies involving the scale effect.