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The Effect of Transfer Port Geometry on Scavenge Flow Velocities At High Engine Speed

Ekenberg, Martin LU and Johansson, Bengt LU (1996) In SAE Special Publications
Abstract
2-D LDV measurements were performed on two different cylinder designs in a fired two-stroke engine running with wide-open throttle at 9000 rpm. The cylinders examined were one with open transfer channels and one with cup handle transfer channels.



Optical access to the cylinder was achieved by removing the silencer and thereby gain optical access through the exhaust port. No addition of seeding was made, since the fuel droplets were not entirely vaporized as they entered the cylinder and thus served as seeding.



Results show that the loop-scavenging effect was poor with open transfer channels, but clearly detectable with cup handle channels. The RMS-value, "turbulence", was low close to the transfer... (More)
2-D LDV measurements were performed on two different cylinder designs in a fired two-stroke engine running with wide-open throttle at 9000 rpm. The cylinders examined were one with open transfer channels and one with cup handle transfer channels.



Optical access to the cylinder was achieved by removing the silencer and thereby gain optical access through the exhaust port. No addition of seeding was made, since the fuel droplets were not entirely vaporized as they entered the cylinder and thus served as seeding.



Results show that the loop-scavenging effect was poor with open transfer channels, but clearly detectable with cup handle channels. The RMS-value, "turbulence", was low close to the transfer ports in both cylinders, but increased rapidly in the middle of the cylinder. The seeding density was used to obtain information about the fuel concentration in the cylinder during scavenging. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Transfer Port Geometry, Two-Stroke, Combustion, Engine, Flow Velocity
in
SAE Special Publications
issue
SP-1131
publisher
Society of Automotive Engineers
external identifiers
  • scopus:84877442872
ISSN
0148-7191
language
English
LU publication?
yes
id
1e66b216-922a-4d66-8e8a-34d9fa74ba23 (old id 538521)
alternative location
http://www.sae.org/technical/papers/960366
date added to LUP
2007-09-17 09:27:07
date last changed
2017-04-16 04:08:07
@inproceedings{1e66b216-922a-4d66-8e8a-34d9fa74ba23,
  abstract     = {2-D LDV measurements were performed on two different cylinder designs in a fired two-stroke engine running with wide-open throttle at 9000 rpm. The cylinders examined were one with open transfer channels and one with cup handle transfer channels.<br/><br>
<br/><br>
Optical access to the cylinder was achieved by removing the silencer and thereby gain optical access through the exhaust port. No addition of seeding was made, since the fuel droplets were not entirely vaporized as they entered the cylinder and thus served as seeding.<br/><br>
<br/><br>
Results show that the loop-scavenging effect was poor with open transfer channels, but clearly detectable with cup handle channels. The RMS-value, "turbulence", was low close to the transfer ports in both cylinders, but increased rapidly in the middle of the cylinder. The seeding density was used to obtain information about the fuel concentration in the cylinder during scavenging.},
  author       = {Ekenberg, Martin and Johansson, Bengt},
  booktitle    = {SAE Special Publications},
  issn         = {0148-7191},
  keyword      = {Transfer Port Geometry,Two-Stroke,Combustion,Engine,Flow Velocity},
  language     = {eng},
  number       = {SP-1131},
  publisher    = {Society of Automotive Engineers},
  title        = {The Effect of Transfer Port Geometry on Scavenge Flow Velocities At High Engine Speed},
  year         = {1996},
}