Effects of Port Angle on Scavenging of an Opposed Piston Two-Stroke Engine Clemson University

Format:

Book

Conference/Event

Author/Creator:

O'Donnell, Patrick Christopher, author.

Contributor:

Filipi, Zoran

Gainey, Brian

Gandolfo, John

Hessel, Randy

Huo, Ming

Kokjohn, Sage

Lawler, Benjamin

Prucka, Robert

Salvi, Ashwin

Vorwerk, Erik

Conference Name:

WCX SAE World Congress Experience (2022-04-05 : Detroit & Online, Michigan, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2022

Summary:

Opposed-piston 2-stroke (OP-2S) engines have the potential to achieve higher thermal efficiency than a typical diesel engine. However, the uniflow scavenging process is difficult to control over a wide range of speeds and loads. Scavenging performance is highly sensitive to pressure dynamics, port timings, and port design. This study proposes an analysis of the effects of port vane angle on the scavenging performance of an opposed-piston 2-stroke engine via simulation. A CFD model of a three-cylinder opposed-piston 2-stroke was developed and validated against experimental data collected by Achates Power Incorporated One of the three cylinders was then isolated in a new model and simulated using cycle-averaged and cylinder-averaged initial/boundary conditions. This isolated cylinder model was used to efficiently sweep port angles from 12 degrees to 29 degrees at different pressure ratios. Results indicate that scavenging performance is correlated with the bulk swirl ratio generated by these port angles. Scavenging performance is also sensitive to the pressure ratio across the engine. It was concluded that, for a given pressure ratio, the smallest port angle produces the best scavenging; however, previous work indicates lower bulk swirl ratio during combustion can have an impact on emissions formation

Notes:

Vendor supplied data

Publisher Number:

2022-01-0590

Access Restriction:

Restricted for use by site license