doi: 10.52899/24141437_2025_04_431
UDK: 621.43 6.3

Dynamic Thermomechanical Analysis: Analyzing the Influence of Loads in Cylinders of Small-Sized Marine Diesel Engines on Valves of Different Designs

Курбанов А. З., Вагабов Н. М., Санаев Н. К., Егоров В. В.
Article language:
Citation Link: Kurbanov AZ, Vagabov NM, Sanaev NK, Egorov VV. Dynamic Thermomechanical Analysis: Analyzing the Influence of Loads in Cylinders of SmallSized Marine Diesel Engines on Valves of Different Designs. Transactions of the Saint Petersburg State Marine Technical University. 2025;4(4):431–443. DOI: 10.52899/24141437_2025_04_431 EDN: FTWLPY

Annotation

BACKGROUND: A pressing issue of contemporary designs of small-sized marine diesel engines is finding ways to produce the highest quality mixture and improving components to increase their efficiency, durability, sustainability, and competitiveness. AIM: This paper studies a valve of a factory-made small-sized marine diesel engine and a modified valve with additional spiral guides (blades, screens) to analyze the influence of the loads occurring in the engine cylinder as a result of the crankshaft rotation (CSR) as illustrated by a small-sized marine diesel engine Ch8.5/11. The structural material was homogeneous. METHODS: The finite element method implemented in the Ansys software was used to perform an unsteady-state thermomechanical analysis of valves of various designs made from a homogeneous material as illustrated by a valve of a smallsized marine diesel engine Ch8.5/11, where the previously studied temperature fields were converted to the pressure acting on the valve, with its follow-up analysis, study, and comparison. RESULTS: During the study, the total deformations and operating stresses were calculated and visualized using the finite element method, the actual safety factor was calculated, and the valve’s spiral guide values were analyzed. For the unsteadystate analysis, we selected the highest stresses exerted on the valves during the operation of a small-sized marine engine. CONCLUSION: The findings show that the total deformation is actually unchanged when the valve design is modified; whereas the operating stress has increased significantly and was the highest in the six-blade valve. The obtained values and software visualization show that the actual safety factor of valves with blades is significantly reduced. Keywords: software; deformation; stress; finite element method; quality; performance; modeling; design; temperature; pressure; valve; blade; small-sized marine diesel engine.

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