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Single-Cycle Impulse from Detonation Tubes with Nozzles

Cooper, M. and Shepherd, J. E. (2008) Single-Cycle Impulse from Detonation Tubes with Nozzles. Journal of Propulsion and Power, 24 (1). pp. 81-87. ISSN 0748-4658. https://resolver.caltech.edu/CaltechAUTHORS:COOjpp08

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Abstract

Experiments measuring the single-cycle impulse from detonation tubes with nozzles were conducted by hanging the tubes in a ballistic pendulum arrangement within a large tank. The detonation-tube nozzle and surrounding tank were initially filled with air between 1.4 and 100 kPa in pressure simulating high-altitude conditions. A stoichiometric ethylene–oxygen mixture at an initial pressure of 80 kPa filled the constant-diameter portion of the tube. Four diverging nozzles and six converging–diverging nozzles were tested. Two regimes of nozzle operation were identified, depending on the environmental pressure. Near sea-level conditions, unsteady gas-dynamic effects associated with the mass of air contained in the nozzle increase the impulse as much as 72% for the largest nozzle tested over the baseline case of a plain tube. Near vacuum conditions, the nozzles quasi-steadily expand the flow, increasing the impulse as much as 43% for the largest nozzle tested over the baseline case of a plain tube. Competition between the unsteady and quasi-steady-flow processes in the nozzle determine the measured impulse as the environmental pressure varies.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.2514/1.30192DOIArticle
ORCID:
AuthorORCID
Shepherd, J. E.0000-0003-3181-9310
Additional Information:Copyright © 2007 by California Institute of Technology. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Received 1 February 2007; revision received 10 August 2007; accepted for publication 22 August 2007. This work was supported by the Office of Naval Research Multidisciplinary University Research Initiative, Multidisciplinary Study of Pulse Detonation Engine (N00014-02-1-0589), and General Electric contract GE-PO A02 81655 under DABT-63-0-0001.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-02-1-0589
General ElectricGE-PO A02 81655
General ElectricDABT-63-0-0001
Issue or Number:1
Record Number:CaltechAUTHORS:COOjpp08
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:COOjpp08
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11251
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:28 Jul 2008 18:57
Last Modified:21 Aug 2020 22:04

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