EFFECTS OF AIR INLET SWIRL ANGLE ON PERFORMANCE OF A TWO-STROKE DIESEL ENGINE
Klein, Jordan A.
Hobson, Garth V.
Seivwright, Douglas L.
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Two-stroke diesel engines are a reliable, robust way to provide power in a multitude of naval applications, from electrical generators to construction equipment to marine propulsion. Improvement in the performance of such a common mechanical element would provide benefits in both reliability and cost effectiveness. Increasing the degree of air-fuel mixing in the cylinder prior to combustion is one such method of performance enhancement and is the method addressed by this research. The research model engine is a Detroit Diesel 3-53 two-stroke engine that utilizes a roots blower and eighteen circumferential holes in each cylinder for air intake and four valves in the cylinder head for exhaust. After performing a baseline run of the test engine, computational fluid analysis was performed on three engine configurations using ANSYS 18.2 CFX software. The cylinder models included one with intake holes in the original configuration, one in which the holes were given a 10 degree upward angle, and one in which the holes were angled 5 degrees farther to the left and 10 degrees upward. Results suggest that a configuration with a 10 degree upward angle of the intake holes will show a higher degree of mixing and increased overall performance.
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