Comparison Between Air-Assisted and Airless Urea Spray for Diesel SCR System by PDA and CFD Tsinghua Univ

Format:

Conference/Event

Author/Creator:

Hua, Hua, author.

Contributor:

Hu, Jing

Shuai, Shi-Jin

Tao, Tang

Zhao, Yan-guang

Conference Name:

SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

The urea NOx selective catalytic reduction (SCR) is an effective technique for the reduction of NOx emitted from diesel engines. Urea spray quality has significant effect on NOx conversion efficiency. The droplet diameter and velocity distribution of air-assisted and airless urea injection systems were obtained by particle dynamics analyzer (PDA) measurement under different spray injection flow rates. It was found that the atomization quality of air-assisted urea injection system is better than that of airless urea injection system. The penetration and spray cone angle were also investigated by high-speed photography. Especially the spray characteristics of air-assisted urea injection system were measured in the constant-volume-bomb by high-speed photography. The atomization and evaporation of airless urea injection systems were modeled using computational fluid dynamics (CFD) based on the experimental results. The numerical model was validated by the experimental results. The numerical results under the different boundary conditions and injection positions of nozzles were compared in order to optimize the spray characteristics and increase the conversion efficiency of NOx

Notes:

Vendor supplied data

Publisher Number:

2012-01-1081

Access Restriction:

Restricted for use by site license