CFD Analysis of Intake Air Swirl Effects on Combustion Efficiency and Emission Reduction in Direct Injection Diesel Engines

¹ Department of Mechanical Engineering, Mailam Engineering College-Mailam, Villupuram 604 304, Tamil Nadu, India
² School of Engineering and Technology, Jaipur National University, Jagatpura, Jaipur, Rajasthan- 302017
³ Department of Mechanical Engineering, Mohan Babu University, Rangampeta, Tirupathi Andhra Pradesh, Pin-code : 517501
⁴ Department of Automobile Engineering, Sri Venkateswara College of Engineering, Pennalur, Sriperumbudur - 602117, Tamil Nadu, India
⁵ Department of Mechanical Engineering, Sri Manakula Vinayagar Engineering College, Madagadipet, Puducherry - 605 107
^{6 to 9} Department of Mechanical Engineering, Sri Manakula Vinayagar Engineering College, Madagadipet, Puducherry - 605 107
^{7 8} Department of Mechanical Engineering, Vels Institute of Science Technology & Advanced Studies, Chennai 600 117, Tamil Nadu, India

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Published online: 16 April 2026

Abstract

The study computational fluid dynamics (CFD-based analysis of the swirl in the intake air of a direct injection diesel engine in order to optimize the efficiency of the combustion process and decrease the emissions to the environment to achieve improved environmental performance. Making of air fuel mixture that is privileged in the combustion chamber controls the I.C Engine performances, strength and operation establishment. The CFD model explored the piston crown to the field of flow in a four stroke engine. The research is guided on the implication of the piston form to flow of fluid characteristic. The fluid flow dynamics show an exact significant part for an air - fuel mixture groundwork becomes greater engine performances, efficiency & combustion like swirl and spill movements. These parameters signify the flow of fluid behavior that impacts the air stream to the cylinder through inlet stroke and significantly improves the air fuel to carry greater mixing through compression incline. In this work have a tendency to contain exclusively to the swirl movement of inducted air through the suction and compression strokes. The engine speed of 2000 revolution per minute is compared to swirl flow created throughout inlet stroke and compression stroke. The output obtained from the mathematical study will be used to inspect the sameness of the air-fuel mixture construction for greater engine performances as well as combustion processes. Keywords: CFD, swirl flow, combustion, energy transition, energy development.