INVESTIGATION OF THE POTENTIAL AND LIMITATIONS OF THE RAM ACCELERATOR

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Authors
  1. Lee, J.
  2. Frost, D.
  3. Brouillette, M.
Corporate Authors
Defence Research Establishment Suffield, Ralston ALTA (CAN);McGill Univ, Montreal QUE (CAN) Dept of Mechanical Engineering;Sherbrooke Univ, Sherbrooke QUE (CAN) Departement de Genie Mecanique
Abstract
Most experiments conducted to date have been aimed at achieving high projectile velocities with rather minimal effort being directed to a detailed understanding of the ram acceleration concept itself. Projectile velocities greater than the theoretical Chapman-Jouguet velocity of the mixture have been reported. However, it is not clear whether this is a steady-state condition or simply a transient fluctuation similar to the overdriven phase of a "galloping" detonation. In practice, the ram acceleration process is transient. Under transient conditions, it is not clear what is the upper limit for the velocity, and under what circumstances the standing combustion wave around the projectile is stable. To address the above fundamental issues, we have performed a one-dimensional investigation of ram accelerator operating modes. We first examined the validity of the pseudo-steady 1-D control volume formulation and found that the pseudo-steady assumption is justified for most current ram accelerator operating modes. We have also exposed the limitations of one-dimensional conversion equations to predict the performance of ram accelerators. These shortcomings are illustrated with the use of a simple, ideal ram accelerator cycle. Secondly, the feasibility of attaining a stable standing detonation wave configuration around a supersonic projectile is studied numerically with a quasi-one-dimensional model. TRUNCATED.
Keywords
RAM accelerators
Report Number
DRES-CR-94-33 — Contractor Report
Date of publication
25 Jul 1994
Number of Pages
103
DSTKIM No
95-01425
CANDIS No
149532
Format(s):
Hardcopy;Document Image stored on Optical Disk

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