LDV Measurement of Transfer Port Efflux Velocities in a Motored Two-Stroke Cycle Engine 921694
The measurement of transfer port efflux velocities using laser doppler velocimetry (LDV) in a motored model two-stroke engine is described. The single cylinder engine used is of two port loop scavenged design, externally blown to provide scavenge flow into the cylinder during the entire port open period. LDV measurements were taken along a vertical path, central to the transfer duct, at the port exit over a range of crankangles at motoring speeds of 225rpm, 600rpm, and 900rpm. At 225rpm further measurements were taken for a range of delivery ratios from 0.7 to 2.0. Relatively uniform velocity profiles indicate plug like flow issuing from the port under most conditions. The resultant flow direction is seen never to align with the transfer duct walls, but to vary as a function of crankangle. Quantitative analysis of angles defining mean flow direction reveal that dynamic efflux behaviour is essentially similar for all tested speeds and delivery ratios.
Citation: McKinley, N., Fleck, R., and Kenny, R., "LDV Measurement of Transfer Port Efflux Velocities in a Motored Two-Stroke Cycle Engine," SAE Technical Paper 921694, 1992, https://doi.org/10.4271/921694. Download Citation
Author(s):
N. R. McKinley, R. Fleck, R. G. Kenny
Affiliated:
Queen's University of Belfast
Pages: 18
Event:
International Off-Highway & Powerplant Congress & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
SAE 1992 Transactions: Journal of Engines-V101-3
Related Topics:
Single cylinder engines
Two stroke engines
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