Scavenging Measurements in a Direct-Injection Two-Stroke Engine Engine Research Center, University of Wisconsin-Madison

Format:

Conference/Event

Author/Creator:

Foudray, H. Z., author.

Conference Name:

Small Engine Technology Conference & Exposition (2003-09-15 : Madison, Wisconsin, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2003

Summary:

The scavenging process in a direct-injection two-stroke research engine was examined by using an electromagnetically controlled poppet valve to sample the trapped charge. A physical model was developed to characterize the scavenging based solely on the measured trapped gas composition. This method obviates the need to measure the post-combustion composition of the trapped charge, which significantly eases the sampling valve requirements. The valve that was developed proved to be very robust and was able to sample over 30% of the trapped mass at 3000 rpm. The measured scavenging efficiency was found to agree well with the non-isothermal two-zone perfect mixing limit of scavenging. The scavenging efficiency was found to increase with delivery ratio, and was nearly independent of speed. The scavenging efficiency was found to decrease with increasing air-fuel ratio at a constant delivery ratio, but the effect was found to be the result of the exhaust gas temperature reduction more than the increase in the blowdown pressure

Notes:

Vendor supplied data

Publisher Number:

2003-32-0081

Access Restriction:

Restricted for use by site license