Atomization and Sprays Journal of the International Institutes for Liquid Atomization and Spray Systems

ISSN for PRINT: 1045-5110

For Online Access

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2008, Volume18

Issue 5

99 pages

DOI: 10.1615/AtomizSpr.v18.i5

Issue price - $118.00

Xiao Jin
Key Laboratory of Power Machinery and Engineering, Ministry of Education, Shanghai Jiao Tong University, P.R. China

Huang Zhen
Shanghai Jiao Tong University

Qiao Xinqi
Key Laboratory of Power Machinery and Engineering, Ministry of Education, Shanghai Jiao Tong University, P.R. China

Injection of fuel containing CO₂ has potential to reduce NO_x and soot emissions in a diesel engine. The gas is dissolved into fuel prior to injection. This paper presents an experimental study on the spray characteristics of fuel containing CO₂ as measured by phase Doppler anemometry. Experiments were performed under atmospheric conditions on diesel hole-type nozzles at constant injection pressure. Effects of CO₂ concentration in diesel fuel on the spray pattern, droplet size, and velocity were measured. Experimental results show that fuel atomization will improve greatly when the concentration of dissolved CO₂ in the fuel exceeds the critical value. The axial and radial velocities of the fuel spray containing CO₂ is larger than that of conventional diesel fuel spray near the nozzle exit due to explosive flashing phenomena. Downstream of the spray, the radial velocity and droplet size of fuel containing CO₂ is much more uniform and smaller than that of pure diesel spray. It is attributed to the greatly enhanced liquid-gas mixing resulting from flash separation of CO₂ from the liquid. New insight into the atomization of fuel containing CO₂ was obtained and a possible mechanism to explain the phenomena was proposed.

DOI: 10.1615/AtomizSpr.v18.i5.20 Download article, 427-447 pages

Article price - $35.00

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