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Fuel-air mixing and distribution in a direct-injection stratified-charge rotary engineA three-dimensional model for flows and combustion in reciprocating and rotary engines is applied to a direct-injection stratified-charge rotary engine to identify the main parameters that control its burning rate. It is concluded that the orientation of the six sprays of the main injector with respect to the air stream is important to enhance vaporization and the production of flammable mixture. In particular, no spray should be in the wake of any other spray. It was predicted that if such a condition is respected, the indicated efficiency would increase by some 6 percent at higher loads and 2 percent at lower loads. The computations led to the design of a new injector tip that has since yielded slightly better efficiency gains than predicted.
Document ID
Document Type
Conference Paper
Abraham, J.
(John Deere Technologies International, Inc. Wood-Ridge, NJ, United States)
Bracco, F. V.
(Princeton University NJ, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Subject Category
Mechanical Engineering
Report/Patent Number
SAE PAPER 890329
Meeting Information
International Congress and Exposition on Rotary Engine Design: Analysis and Developments(Detroit, MI)
Accession Number
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