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Effect of Fuel Injection and Mixing Characteristics on Pulse-Combustor Performance at High-PressureRecent calculations of pulse-combustors operating at high-pressure conditions produced pressure gains significantly lower than those observed experimentally and computationally at atmospheric conditions. The factors limiting the pressure-gain at high-pressure conditions are identified, and the effects of fuel injection and air mixing characteristics on performance are investigated. New pulse-combustor configurations were developed, and the results show that by suitable changes to the combustor geometry, fuel injection scheme and valve dynamics the performance of the pulse-combustor operating at high-pressure conditions can be increased to levels comparable to those observed at atmospheric conditions. In addition, the new configurations can significantly reduce the levels of NOx emissions. One particular configuration resulted in extremely low levels of NO, producing an emission index much less than one, although at a lower pressure-gain. Calculations at representative cruise conditions demonstrated that pulse-combustors can achieve a high level of performance at such conditions.
Document ID
20140016829
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Yungster, Shaye (Ohio Aerospace Inst. Cleveland, OH, United States)
Paxson, Daniel E. (NASA Glenn Research Center Cleveland, OH United States)
Perkins, Hugh D. (NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
December 2, 2014
Publication Date
July 28, 2014
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
GRC-E-DAA-TN16221
Meeting Information
Meeting: Joint Propulsion Conference
Location: Cleveland, Ohio
Country: United States
Start Date: July 28, 2014
End Date: July 30, 2014
Sponsors: American Inst. of Aeronautics and Astronautics, American Society of Mechanical Engineers, American Society for Engineering Education, Society of Automotive Engineers, Inc.
Funding Number(s)
CONTRACT_GRANT: NNC13TA84T.04
CONTRACT_GRANT: NNC13BA10B
WBS: WBS 794072.02.03.05.04
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Propulsion
Pulsejet Engines
Jet Engines
Combustion Chambers

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