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Improvement of the Exhaust Valve Damping Unit for a 2-Stroke Large Diesel Engine

[+] Author Affiliations
Dong-Hun Kim, Tae-Hyung Park, Hoon-Suk Kim, Sang-Lip Kang, Ju-Tae Kim

Hyundai Heavy Industries Co., Ltd., Ulsan, Korea

Paper No. IMECE2010-37619, pp. 547-554; 8 pages
doi:10.1115/IMECE2010-37619
From:
  • ASME 2010 International Mechanical Engineering Congress and Exposition
  • Volume 11: New Developments in Simulation Methods and Software for Engineering Applications; Safety Engineering, Risk Analysis and Reliability Methods; Transportation Systems
  • Vancouver, British Columbia, Canada, November 12–18, 2010
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4448-9
  • Copyright © 2010 by ASME

abstract

Hydraulic exhaust valve actuating system is generally applied on a 2-stroke large diesel engine for the purpose of structural stability and simplification. In this type of system, damping unit has the function of decreasing impact at the moment of valve closing and preventing damage of exhaust valve and valve seat. However, in the opening stage of exhaust valve, existing damping unit substantially increases maximum hydraulic pressure and causes the cavitation inside which lead to vibration, noise, and higher pressure fluctuation and cavitation damage. Design modification of damping unit was performed to solve existing problems. Hydraulic simulation of exhaust valve actuating system was carried out to verify the application possibility of design modification. Also the effect of design modification could be verified by the rig test of prototype. Finally, it was applied on actual engines and proved to give satisfactory results in solving the substantial problems of the existing damping unit.

Copyright © 2010 by ASME

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