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Diameter effect in the initiation process of combustion in a ram accelerator in subdetonative mode

Published online by Cambridge University Press:  12 September 2002

P. Bauer
Affiliation:
Laboratoire de Combustion et de Détonique (UPR 9028 CNRS), ENSMA, BP 109, 86960 Futuroscope Cedex, France
M. Henner
Affiliation:
French-German Research Institute, ISL, BP 34, 68301 Saint-Louis Cedex, France
J. F. Legendre
Affiliation:
French-German Research Institute, ISL, BP 34, 68301 Saint-Louis Cedex, France
M. Giraud
Affiliation:
French-German Research Institute, ISL, BP 34, 68301 Saint-Louis Cedex, France Valeo Thermique Moteur, 8 rue Louis Armand, BP 17, 78321 La Verrière Cedex, France
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Abstract

A large variety of initiation results in a ram accelerator have shown that a series of interactive parameters play a key role, such as the design of the facility, tube diameter, shape of both the projectile and sabot and the choice of the reactive propellant mixture. Two different ram accelerators were used at ISL for this study, namely a 30-mm and a 90-mm-caliber. In addition to the diameter effect, it was observed that the dimension of the sabot must be adapted not only to the caliber of the tube but also to both the launching device and vent section that are located before the ram accelerator tube. For instance, a sensitive mixture yielded a superdetonative mode in the larger tube diameter facility at ISL. Comparative experiments were conducted in these two caliber ram accelerators at ISL. Important transient effects were observed as the projectile enters the tube which could explain the discrepancies between the data derived from similar devices. The aim of the present paper is to provide a series of data that show the effect of the tube diameter on the initiation process of the propellant mixtures that are currently used in this facility. The design of the sabot is also discussed.

Keywords

Type
Research Article
Copyright
© EDP Sciences, 2002

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References

C. Knowlen, Theoretical and Experimental Investigation of the Thermodynamics of the Thermally Choked Ram Accelerator, Ph.D. thesis, University of Washington, Seattle, WA, USA, 1991
Bauer, P., Knowlen, C., Bruckner, A.P., Real Gas Effects on the Prediction of Ram Accelerator Performance, Shock Waves 8, 113 (1998) CrossRef
Bauer, P., Legendre, J.F., Knowlen, C., Higgins, A.J., A review of detonation initiation techniques for insensitive dense methane-oxygen-nitrogen mixtures, Eur. Phys. J. AP 2, 183 (1998) CrossRef
P. Bauer, C. Knowlen, A.J. Higgins, J.F. Legendre, Detonation initiation of insensitive dense gaseous mixtures by piston impact, in Proceedings of the 21st International Symposium on Shock Waves, Great Keppel Island, Australia, 1997, edited by A.F.P. Houwing (University of Queensland, 1997), p. 1609
P. Bauer, J.F. Legendre, C. Knowlen, A.J. Higgins, Detonation of insensitive dense gaseous mixtures in tubes, in Proceedings of the 32nd Joint Propulsion Conference, Lake Buena Vista, FL, USA, 1996, edited by AIAA (1996), paper 96-2682
P. Bauer, J.F. Legendre, Detonability Limits of Propellant Mixtures used in the Ramac, in Proceedings of the 14th International Symposium on Ballistics, Québec, Canada, 1993, edited by M.J. Murphy, M.J.E. Backofen (ISBN 0-9618156-9-8), p. 389
Lehr, H.F., Experiments on shock-induced combustion, Astronaut. Acta 17, 589 (1972)
A.J. Higgins, Detonation Initiation by Supersonic Blunt Bodies, Ph.D. thesis, University of Washington, Seattle, WA, USA, 1996
J.K. Ahuja, S.N. Tiwari, Effect of Various flow and Physical Parameters on Stability of Shock-Induced Combustion, in Proceedings of the 34th Aerospace Sciences Meeting, Reno, NV, USA, 1996, edited by AIAA (1996), paper 96-0732
Chiping Li, K. Kailasanath, E.S. Oran, A.M. Landsberg, J.P. Boris, Dynamics of Oblique Detonations in Ram Accelerators, Shock Waves 5, 97 (1995)
V.G. Weirs, G.V. Candler, Simulation of Ram Accelerator Flowfields Using Elemental Conservation Equations, in Proceedings of the 30th Joint Propulsion Conference, Indianapolis, IN, USA, 1994, edited by AIAA (1994), paper 94-2966
Yungster, S., Rabinowitz, M.J., Numerical Study of Shock Induced Combustion Using a Detailed Methane-Air Mechanism, J. Prop. Power 10, 609 (1994) CrossRef
Yungster, S., Eberhardt, S., Bruckner, A.P., Numerical Simulation of Hypervelocity Projectiles in Detonable Gases AIAA J. 29, 238 (1991)
M.H. Lefebvre, Modeling of Unstarts in Ram Accelerator, in Proceedings of the 2nd Int. Workshop on Ram Accelerators, Seattle, WA, USA, 1995, edited by A.P. Bruckner, C. Knowlen (University of Washington, 1995)
M.J. Nusca, Reacting Flow Simulation of Transient, Multi-stage Ram Accelerator Operation and Design Studies, in Proceedings of the 2nd Int. Workshop on Ram Accelerators, Seattle, WA, USA, 1995 edited by A.P. Bruckner, C. Knowlen (University of Washington, 1995)
Dabora, E.K., Desbordes, D., Guerraud, C., Wagner, H.G., Oblique Detonation at Hypersonic Velocities, Progress in Astronautics and Aeronautics, AIAA J. 133, 187 (1991)
Desbordes, D., Hamada, L., Guerraud, C., Supersonic H2-Air Combustion Behind Oblique Shock Waves, Shock Waves 4, 339 (1995) CrossRef
C. Viguier, C. Guerraud, D. Desbordes, H2-air and CH4-air Detonations and Combustion Behind Oblique Shock Waves, in Proceedings of the 25th Symposium (Int.) on Combustion, 1994, edited by The Combustion Institute (1994), p. 53
Schultz, E., Knowlen, C., Bruckner, A.P., Obturator and Detonation Experiments in the Subdetonative Ram Accelerator, Shock Waves 9, 181 (1999) CrossRef
M.J. Nusca, Numerical Simulation of Reacting Flow in a Thermally Choked Ram Accelerator Projectile Launch System, in Proceedings of the 27th Joint Propulsion Conference, Sacramento, CA, USA, 1991, edited by AIAA (1991), paper 91-1915
A.P. Bruckner, J.B. Hinkey, E.A. Burnham, C. Knowlen, Investigation of 3-D reacting Flow Phenomena in a 38 mm Ram Accelerator, in Proceedings of the 1st Int. Workshop on Ram Accelerators, Seattle, Saint-Louis, France, 1993, edited by M. Giraud, G. Smeets, 1993
J. Auzias De Turenne, G. Chew, A.P. Bruckner, Recent Results from the University of Washington's 38 mm Ram Accelerator, in Proceedings of the 28th Joint Propulsion Conference, Nashville, TN, USA, 1992, edited by AIAA (1992), paper 92-3782
P. Bauer, C. Knowlen, A.P. Bruckner, M. Henner, J.F. Legendre, M. Giraud, Determination of the Choke Pressure of a Ram Accelerator Projectile in Subdetonative Regime, J. Phys. IV France 10, Pr11-59 (2000)
M. Giraud, J.F. Legendre, G. Simon, M. Henner, D. Voisin, RAMAC in 90 mm caliber or RAMAC 90. Starting Process, Control of the Ignition Location and Performances in the Thermally Choked Propulsion Mode, in Proceedings of the 2nd Int. Workshop on Ram Accelerators, Seattle, WA, USA, 1995, edited by A.P. Bruckner, C. Knowlen (University of Washington, 1995)
J.F. Stewart, A.P. Bruckner, C. Knowlen, Effects of Launch Tube Shock Dynamics on Initiation of Ram Accelerator Operation, in Ram Accelerators, edited by K. Takayama, A. Sasoh (Springer Berlin, 1997)
M. Henner, M. Giraud, J.F. Legendre, C. Berner, Initiation of Reactive Mixtures in a Ram Accelerator, in Proceedings of the 33rd Joint Propulsion Conference, July 7-9, Seattle, WA, USA, 1997, edited by AIAA (1997), paper 97-3173
M. Henner, M. Giraud, J.F. Legendre, C. Berner, CFD Computations of Steady and Non-Reactive Flow Around Fin-Guided Ram Projectiles, in Ram Accelerators, edited by K. Takayama, A. Sasoh (Springer Berlin, 1997)
J.F. Legendre, M. Giraud, P. Bauer, D. Voisin, 90L35 Detonation Tube Experiments: Influence of Diluent Nature on the Detonation Characteristics of Dense Methane-based Gaseous Explosives, in Proceedings of the 2nd Int. Workshop on Ram Accelerators, Seattle, WA, USA, 1995, edited by A.P. Bruckner, C. Knowlen (University of Washington, 1995)
J.F. Stewart, C. Knowlen, A.P. Bruckner, Effects of Launch Tube Gases on Starting of the Ram Accelerator, in Proceedings of the 33rd Joint Propulsion Conference, Seattle, WA, USA, 1997, edited by AIAA (1997), paper 97-2652
M. Giraud, J.F. Legendre, G. Simon, RAMAC 90: Experimental Studies and Results in 90 mm Caliber, Length 108 Caliber, in Proceedings of the 1st Int. Workshop on Ram Accelerators, Seattle, Saint-Louis, France, 1993, edited by M. Giraud, G. Smeets, 1993
E.L. Petersen, D.F. Davidson, R.K. Hanson, Ignition Delay Times of Ram Accelerator Mixtures, in Proceedings of the 32nd Joint Propulsion Conference, Lake Buena Vista, FL, USA, 1996, edited by AIAA (1996), paper 96-2681
G. Patz, F. Seiler, G. Smeets, J. Srulijes, Status of ISL's RAMAC 30 with Fin Guided Projectiles Accelerated in a Smooth Bore in Proceedings of the 2nd Int. Workshop on Ram Accelerators, Seattle, WA, USA, 1995, edited by A.P. Bruckner, C. Knowlen (University of Washington, 1995)
J.E. Elvander, C. Knowlen, A.P. Bruckner, High Acceleration Experiments using a Multi-stage Ram Accelerator, in Ram Accelerators, edited by K. Takayama, A. Sasoh (Springer Berlin, 1997)
M. Giraud, J.F. Legendre, M. Henner, RAMAC in Subdetonative Propulsion Mode: State of ISL Studies, in Ram Accelerators, edited by K. Takayama, A. Sasoh (Springer Berlin, 1997)
D. Kruczynski, Experiments in a 120-mm Ram Accelerator, in Proceedings of the 14th International Symposium on Ballistics, Québec, Canada, 1993, edited by M.J. Murphy, M.J.E. Backofen (ISBN 0-9618156-9-8), p. 173
J.F. Legendre, P. Bauer, M. Giraud, RAMAC 90: Detonation Initiation of Insensitive Dense Methane-Based Mixtures by Normal Shock Waves, in Ram Accelerators, edited by K. Takayama, A. Sasoh (Springer Berlin, 1997)
M. Giraud, J.F. Legendre, G. Simon, L. Catoire, Ram Accelerator in 90 mm Caliber. First Results Concerning the Scale Effect in the Thermally Choked Propulsion Mode, in Proceedings of the 13th International Symposium on Ballistics, Stockholm, Sweden, 1992
M. Giraud, G. Simon, Sabot for Projectiles of Ram Accelerators and Projectiles Equipped with such a Sabot, United States Patent No. 5, 394, 805

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