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Record 69 of 4030
Mathematical description of complex chemical kinetics and application to CFD modeling codes
External Online Source: doi:10.1016/0956-0521(93)90025-R
Author and Affiliation:
Bittker, D. A.(NASA Lewis Research Center, Cleveland, OH, United States)
Abstract: A major effort in combustion research at the present time is devoted to the theoretical modeling of practical combustion systems. These include turbojet and ramjet air-breathing engines as well as ground-based gas-turbine power generating systems. The ability to use computational modeling extensively in designing these products not only saves time and money, but also helps designers meet the quite rigorous environmental standards that have been imposed on all combustion devices. The goal is to combine the very complex solution of the Navier-Stokes flow equations with realistic turbulence and heat-release models into a single computer code. Such a computational fluid-dynamic (CFD) code simulates the coupling of fluid mechanics with the chemistry of combustion to describe the practical devices. This paper will focus on the task of developing a simplified chemical model which can predict realistic heat-release rates as well as species composition profiles, and is also computationally rapid. We first discuss the mathematical techniques used to describe a complex, multistep fuel oxidation chemical reaction and develop a detailed mechanism for the process. We then show how this mechanism may be reduced and simplified to give an approximate model which adequately predicts heat release rates and a limited number of species composition profiles, but is computationally much faster than the original one. Only such a model can be incorporated into a CFD code without adding significantly to long computation times. Finally, we present some of the recent advances in the development of these simplified chemical mechanisms.
Publication Date: Feb 01, 1993
Document ID:
19950042442
(Acquired Dec 28, 1995)
Accession Number: 95A74041
Subject Category: MATHEMATICAL AND COMPUTER SCIENCES (GENERAL)
Document Type: Journal Article
Publication Information: Computing Systems in Engineering (ISSN 0956-0521); 4; 1; p. 1-12
Publisher Information: United Kingdom
Financial Sponsor: NASA; United States
Organization Source: NASA Lewis Research Center; Cleveland, OH, United States
Description: 12p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: COMPUTATIONAL FLUID DYNAMICS; COMPUTER PROGRAMS; MATHEMATICAL MODELS; REACTION KINETICS; UTILIZATION; CHEMICAL EVOLUTION; DIFFERENTIAL EQUATIONS; GAS MIXTURES; KINETIC THEORY; SENSITIVITY
Imprint And Other Notes: Computing Systems in Engineering vol. 4, no. 1 p. 1-12 February 1993
Availability Source: Other Sources
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