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Progress and Challenges in Droplets and Spray Combustion FREE

[+] Author Affiliations
H. H. Chiu

National Cheng Kung University, Tainan, Taiwan

Paper No. 97-AA-071, pp. V001T13A047; 18 pages
doi:10.1115/97-AA-071
From:
  • ASME 1997 Turbo Asia Conference
  • ASME 1997 Turbo Asia Conference
  • Singapore, September 30–October 2, 1997
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7867-5
  • Copyright © 1997 by ASME

abstract

Recent theoretical developments in droplet and spray combustion have been reviewed with due emphasis placed upon the modern interpretation of phenomena and the elucidation of unified theoretical approaches and the foundation of concepts in the area of selected outstanding problems previously identified. Universal laws of a droplet for a dilute and a non-dilute spray, developed recently by the techniques of canonical integration and renormalizaton, offer remarkably broad based knowledge and quantitative prediction of droplet exchange rates in a general hydrodynamic environment. The phenomena and criteria of state transition and the principles of partition of gasification among all the major subprocesses at the transition state are presented. Also reviewed is the multi-state behavior of an isolated converting droplet in the critical ranges of Reynolds number and Damkohler number. Recent experimental validations of group combustion phenomena in laminar sprays and turbulent premixed sprays are presented and the concept of hierarchical group combustion in practical liquid sprays are discussed. Emerging interest in the large scale structures, featured by inhomogeneous local clustering and declustering of droplets in liquid sprays are presented. Various mechanisms of the formation of complex configurations of structures are identified and theoretical categorization based on hierarchical distribution functions are proposed. Kinetic theoretic approach of many-droplet system based on Born, Bogoliuvob, Green Kirkwood, and Yvon’s hierarchy is extended for the classification of structural configuration and the predictions of the dynamic evolution as well as the exchange of scalar and vectorial properties are discussed.

Copyright © 1997 by ASME
Topics: Combustion , Drops , Sprays
This article is only available in the PDF format.

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