J. Phys. IV France
Volume 10, Numéro PR11, November 2000
Fourth International Workshop on Ram Accelerators
Page(s) Pr11-49 - Pr11-58
Fourth International Workshop on Ram Accelerators

J. Phys. IV France 10 (2000) Pr11-49-Pr11-58

DOI: 10.1051/jp4:20001106

Investigation of obturator and ignitor effects on low velocity starting of the ram accelerator

C. Knowlen1, C. Bundy1, A.P. Bruckner1 and D. Kruczynski2

1  Aerospace and Energetics Research Program, University of Washington, AERP, Box 352250, Seattle, WA 98 195, U.S.A.
2  Utron Inc., 8506 Wellington Rd., Manassas, VA 90109, U.S.A.

An experimental investigation of the effects of obturator geometry, propellant chemistry, and onboard pyrotechnic ignitor systerns on the starting characteristics of the ram accelerator at low launch velocity has been conducted at the University of Washington 38-mm-bore facility. The ram accelerator was successfully started at entrance velocities as low as 760 m/s using stoichiometric methane/oxygen propellants with various levels of carbon dioxide dilution and obturator configurations at a fill pressure of 2.5 MPa. Experiments using an onboard pyrotechnic ignitor dernonstrated that ignition of the propellant and starting of the ram accelerator could occur without the presence of the obturator-driven normal shock.

© EDP Sciences 2000