Effect of Cooling of Burned Gas by Vertical Vortex on NOx Reduction in Small DI Diesel Engines

Daisuke Shimo; Motoshi Kataoka; Hidefumi Fujimoto

doi:10.4271/2004-01-0125

2004-03-08

Effect of Cooling of Burned Gas by Vertical Vortex on NOx Reduction in Small DI Diesel Engines 2004-01-0125

A new nitrogen oxide (NOx) reduction concept is suggested. A strong vertical vortex generated within the combustion bowl can mix hot burned gas into the cold excess air at the center of the combustion-bowl. This makes the burned gas cool rapidly. Therefore, it is possible to reduce NOx, which would be produced if the burned gas remained hot. In this paper the effect was verified with a 3D-CFD analysis of spray, air, combustion gas, and thermal efficiency as well as experiments on a 4-cylinder 2.0-liter direct injection diesel engine.

The results confirmed that the vertical vortex was able to be strengthened with the change of spray characteristics and the combustion bowl shapes. This strengthened vertical vortex was able to reduce NOx by approximately 20% without making smoke and thermal-efficiency worse. Above results proved the effectiveness of this method.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Digital $37.00 Print $37.00

Preview Document

We also recommend:

Standards

SAE Mobilus®

Publications

News

Events

Professional Development

A World in Motion (PreK-12)

Participate with SAE

SAE Membership

Donate

Effect of Cooling of Burned Gas by Vertical Vortex on NOx Reduction in Small DI Diesel Engines 2004-01-0125

SAE MOBILUS