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Correlation Of Two Stroke “Two Volume” Scavenging Models With Test Data
Technical Paper
2000-01-3071
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
It is well known that the use of “two volume” scavenging models, where the cylinder is idealized as two volumes with gas exchanged between them, represents a substantial improvement over the “perfect mixing” scavenging model for the computer simulation of two stroke engines. This is especially true during the early stages of the scavenging process, when scavenge ratio is low. It is shown that a simple, closed form relationship exists between the “stripping off” factor, Y, used in two volume scavenging models and the variation in scavenge efficiency with scavenge ratio.. A method is presented for estimating Y at low scavenge ratios using existing correlations of scavenge efficiency with scavenge ratio. This should make it possible to construct very good two volume scavenging models using only existing published data. Such models would be able to simulate in cylinder and exhaust gas conditions during the early stages of scavenging.
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Citation
Addoms, R., "Correlation Of Two Stroke “Two Volume” Scavenging Models With Test Data," SAE Technical Paper 2000-01-3071, 2000, https://doi.org/10.4271/2000-01-3071.Also In
References
- Blair, G.P. The Basic Design of Two Stroke Engines SAE 1990
- IMSL Scientific Subroutine Library IMSL 1991
- Ralston, A. Wilf, H.S. Mathematical Methods for Digital Computers Wiley 1967
- Borman, G.L. Streit, E.E. “Mathematical Simulation of a Large Turbocharged Diesel Engine” SAE paper # 710176 1971