Accession Number:

ADA439384

Title:

Evaluation and Selection of an Efficient Fuel/Air Initiation Strategy for Pulse Detonation Engines

Descriptive Note:

Master's thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

Report Date:

2005-09-01

Pagination or Media Count:

71.0

Abstract:

Rapid and efficient initiation of hydrocarbonair mixtures has been identified as one of the critical and enabling technologies for Pulse Detonation Engines PDEs. Although the NPS Rocket Propulsion Laboratory has successfully demonstrated fuelair detonations in a valveless pulse detonation engine using ethylene, propane, and JP-10 fuels, past engine designs have relied upon a sensitive fueloxygen initiator unit. To realize the increased thermodynamic efficiencies of PDEs and thus compete with ramjets and other supersonic platforms, it is imperative to eliminate any need for supplementary oxygen in an air-breathing PDE design. This thesis examined ignition technologies and initiator designs which did not require auxiliary oxygen, including capacitive discharge systems and the developing technology of Transient Plasma Ignition TPI. The current NPS pulse detonation engine architecture was modified to evaluate the various ignition strategies in a PDE operating on an ethyleneair mixture at simulated supersonic cruising conditions. Comparisons were based upon ignition success rate, ignition delay time, detonation wave speed, and Deflagration-to-Detonation DDT distance. Reliability and performance of the TPI system proved to be superior to conventional ignition systems. Furthermore, successful initiation of a PDE operating at a frequency of up to 40 hertz was demonstrated without the use of supplementary oxygen.

Subject Categories:

  • Combustion and Ignition
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE