Influence of inlet valve shape on air vortex characteristics in a marine engine cylinder
Abstract
The influence patterns of the intake valve shape on the characteristics of the air vortex in the cylinder of a marine engine are studied. The literature review showed that the scientific side of the issue of improving the design of intake valves is studied by scientists and engineers from leading universities and technology companies around the world. Unresolved scientific issues hinder the large-scale use of valves with screens and spiral guides in marine diesel engines. Therefore, further research in this area is an urgent task. The article presents the results of a study of the influence of the wrap angle of the screen and spiral guides on the intake valve on the filling factor, swirl number, average and pulsation velocities of the air vortex in the cylinder of the 16D49 marine diesel engine. The mathematical model of the working process of the marine engine was based on three-dimensional equations of unsteady transfer. The k-ω SST turbulence model was used to determine the turbulence characteristics. It was found that the use of valves with guide inserts contributes to the formation of an organized orderly air movement around the engine cylinder axis; reduction of the filling factor by 1 — 4 %; increase of the swirl number by 2.7 times; reduction of the pulsation velocity by 3.9 times and increase of the average flow velocity by 3.6 times. It is shown that the use of valves with guide inserts can be a relevant solution for organizing the vortex movement of air in the cylinder of a marine engine.
About the Authors
I. R. Galiev
St. Petersburg State Marine Technical University
Russian Federation
Russian Federation
PhD, Associate Professor
190121 Russia, St. Petersburg, Lotsmanskaya ul., 3
D. S. Maksimov
St. Petersburg State Marine Technical University
Russian Federation
Russian Federation
Master's student
190121 Russia, St. Petersburg, Lotsmanskaya ul., 3
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Review
For citations:
Galiev I.R., Maksimov D.S. Influence of inlet valve shape on air vortex characteristics in a marine engine cylinder. Research Bulletin by Russian Maritime Register of Shipping. 2024;1(76):96-105. (In Russ.)
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