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International Journal of Fluid Mechanics Research
ESCI SJR: 0.22 SNIP: 0.446 CiteScore™: 0.5

ISSN Imprimer: 2152-5102
ISSN En ligne: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v41.i1.40
pages 51-70

Swirl Atomizer Design for Evaporative Cooling of High Temperature Compressed Air Stream

Uzair Ahmed Dar
School of Mechanical Engineering, Northwestern Polytechnical University Xi'an, Shaanxi, China; Faculty of Mechanical Engineering GIK Institute of Engineering Sciences and Technology, Pakistan
Mykola Bannikov
Faculty of Mechanical Engineering GIK Institute of Engineering Sciences and Technology, Pakistan

RÉSUMÉ

This work presents the design of a swirl atomizer which provides a certain flow rate of water with required spray quality for effective evaporative cooling of high temperature compressed air of a turbocharged diesel engine. By using wet compression theoretical model, the desired mass flow rate of water and quality of spray for effective evaporation was determined. The evaporative cooling decreases the intake air temperature of engine and increases its mass flow rate, with constant fuel-to-air ratio this increase in air mass flow rate increases the power of the engine. Abramovich's theory along with Kliachko's theory was followed to design a swirl atomizer that provides the required spray characteristics. Information has been presented on the effect of atomizer inlet port geometry, swirl chamber design, orifice design and the importance of swirling inside atomizer. The effects of atomizer geometric parameters such as angle of conical convergence, length-to-diameter ratio of inlet port and of swirl chamber were examined. It was concluded that the length-to-diameter ratio of swirl chamber has a significant effect on atomizer flow rate and spray cone angle determination. With the same injection pressure, its increase leads to enhancing the mass flow rate while decreasing the spray cone angle from the atomizer. The atomizer was tested experimentally and through fluid flow modeling for its required spray quality and the results were fairly close with theoretically predicted results. The design of atomizer was also optimized for required spray characteristics by modeling the fluid flow inside the atomizer.


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