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Computational Study of Near-limit Propagation of Detonation in Hydrogen-air MixturesA computational investigation of the near-limit propagation of detonation in lean and rich hydrogen-air mixtures is presented. The calculations were carried out over an equivalence ratio range of 0.4 to 5.0, pressures ranging from 0.2 bar to 1.0 bar and ambient initial temperature. The computations involved solution of the one-dimensional Euler equations with detailed finite-rate chemistry. The numerical method is based on a second-order spatially accurate total-variation-diminishing (TVD) scheme, and a point implicit, first-order-accurate, time marching algorithm. The hydrogen-air combustion was modeled with a 9-species, 19-step reaction mechanism. A multi-level, dynamically adaptive grid was utilized in order to resolve the structure of the detonation. The results of the computations indicate that when hydrogen concentrations are reduced below certain levels, the detonation wave switches from a high-frequency, low amplitude oscillation mode to a low frequency mode exhibiting large fluctuations in the detonation wave speed; that is, a 'galloping' propagation mode is established.
Document ID
20020090897
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Yungster, S. (NASA Lewis Research Center Cleveland, OH United States)
Radhakrishnan, K. (NASA Lewis Research Center Cleveland, OH United States)
Date Acquired
September 7, 2013
Publication Date
October 1, 2002
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
NAS 1.26:211889
NASA/CR-2002-211889
ICOMP-2002-06
E-13571
AIAA Paper 2002-3712
Meeting Information
Meeting: 38th Annual Joint Propulsion Conference and Exhibit
Location: Indianapolis, IN
Country: United States
Start Date: July 7, 2002
End Date: July 10, 2002
Sponsors: Society of Automotive Engineers, Inc., American Society of Mechanical Engineers, American Inst. of Aeronautics and Astronautics, American Society for Electrical Engineers
Funding Number(s)
PROJECT: RTOP 708-48-13
CONTRACT_GRANT: NCC3-542
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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