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Numerical Study of Stratified Charge Combustion in Wave RotorsA wave rotor may be used as a pressure-gain combustor effecting non-steady flow, and intermittent, confined combustion to enhance gas turbine engine performance. It will be more compact and probably lighter than an equivalent pressure-exchange wave rotor, yet will have similar thermodynamic and mechanical characteristics. Because the allowable turbine blade temperature limits overall fuel/air ratio to sub-flammable values, premixed stratification techniques are necessary to burn hydrocarbon fuels in small engines with compressor discharge temperature well below autoignition conditions. One-dimensional, unsteady numerical simulations of stratified-charge combustion are performed using an eddy-diffusivity turbulence model and a simple reaction model incorporating a flammability limit temperature. For good combustion efficiency, a stratification strategy is developed which concentrates fuel at the leading and trailing edges of the inlet port. Rotor and exhaust temperature profiles and performance predictions are presented at three representative operating conditions of the engine: full design load, 40% load, and idle. The results indicate that peak local gas temperatures will result in excessive temperatures within the rotor housing unless additional cooling methods are used. The rotor itself will have acceptable temperatures, but the pattern factor presented to the turbine may be of concern, depending on exhaust duct design and duct-rotor interaction.
Document ID
19970025199
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Nalim, M. Razi (National Academy of Sciences - National Research Council Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
July 1, 1997
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
E-10815
NAS 1.15:107513
AIAA Paper 97-3141
NASA-TM-107513
Meeting Information
Meeting: Joint Propulsion Conference and Exhibit
Location: Seattle, WA
Country: United States
Start Date: July 6, 1997
End Date: July 9, 1997
Sponsors: Society of Automotive Engineers, Inc., American Society for Electrical Engineers, American Society of Mechanical Engineers, American Inst. of Aeronautics and Astronautics
Accession Number
97N24813
Funding Number(s)
PROJECT: RTOP 505-26-33
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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