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Regressed relations for forced convection heat transfer in a direct injection stratified charge rotary engineCurrently, the heat transfer equation used in the rotary combustion engine (RCE) simulation model is taken from piston engine studies. These relations have been empirically developed by the experimental input coming from piston engines whose geometry differs considerably from that of the RCE. The objective of this work was to derive equations to estimate heat transfer coefficients in the combustion chamber of an RCE. This was accomplished by making detailed temperature and pressure measurements in a direct injection stratified charge (DISC) RCE under a range of conditions. For each specific measurement point, the local gas velocity was assumed equal to the local rotor tip speed. Local physical properties of the fluids were then calculated. Two types of correlation equations were derived and are described in this paper. The first correlation expresses the Nusselt number as a function of the Prandtl number, Reynolds number, and characteristic temperature ratio; the second correlation expresses the forced convection heat transfer coefficient as a function of fluid temperature, pressure and velocity.
Document ID
19890024937
Document Type
Conference Paper
Authors
Lee, Chi M. (NASA Lewis Research Center Cleveland, OH, United States)
Schock, Harold J. (Michigan State University East Lansing, United States)
Date Acquired
August 13, 2013
Publication Date
February 1, 1988
Subject Category
MECHANICAL ENGINEERING
Report/Patent Number
SAE PAPER 880626
Distribution Limits
Public
Copyright
Other