Numerical Analysis of High Power Marine Diesel Engine Main Bearing Load and Lubricating Properties

2013 ◽  
Vol 331 ◽  
pp. 25-30
Author(s):  
Xiu Xu Zhao ◽  
An Jian Huang ◽  
Zhi Xiang Hu
Keyword(s):  
Diesel Engine ◽  
High Power ◽  
Dynamic Pressure ◽  
Marine Diesel Engine ◽  
Main Bearing ◽  
Minimum Thickness ◽  
Medium Speed ◽  
Bearing Load ◽  
Marine Diesel ◽  
Lubrication Condition

The main bearing is one of the primary friction pairs of a diesel engine. The lubrication condition affects the performance of the marine diesel engine directly. Continuous working time of main bearings is longer, load is higher and working condition is even worse especially in low medium speed marine diesel engine, making it difficult to form good dynamic pressure lubrication.Therefore, this paper takes a high-power marine diesel G32 with 9 cylinders as an example, calculates and analyzes the load, the orbit of main shaft center and the minimum thickness of oil film in each main bearing, providing the basis to estimate each main bearing’s lubricating condition, predicting each main bearing’s performance precisely and judging whether there exists abnormal working conditions in each main bearing.

Stress Distribution Analysis on Alloy Layer of High Power Marine Diesel Engine Bearing Bush

2013 ◽  
Vol 331 ◽  
pp. 148-152
Author(s):  
Xiu Xu Zhao ◽  
Zhi Xiang Hu ◽  
An Jian Huang
Keyword(s):  
Diesel Engine ◽  
High Power ◽  
Alloy Layer ◽  
Marine Diesel Engine ◽  
Oil Film ◽  
Marine Diesel ◽  
Bearing Alloy ◽  
Stress And Strain Distribution ◽  
Engine Bearing ◽  
Oil Film Pressure

According to the characteristics of large size, small clearance ratio, high oil film pressure and thin oil film thickness in the actual conditions of high power marine diesel engine bearing, this Paper analyzes oil film pressure distribution on inner surface of bearing bush based on the finite difference method, uses finite element method to establish the hierarchical model, and analyzes stress and strain distribution on bearing alloy. In addition, this Paper researches the changes of stress and strain distribution on bearing alloy layer when alloy layer thickness changes for the optimization design of high power marine diesel engine bearing bush.

Particle emissions characterization from a medium-speed marine diesel engine with two fuels at different sampling conditions

Fuel ◽  
2016 ◽  
Vol 186 ◽  
pp. 456-465 ◽  
Author(s):  
L. Ntziachristos ◽  
E. Saukko ◽  
K. Lehtoranta ◽  
T. Rönkkö ◽  
H. Timonen ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Marine Diesel Engine ◽  
Particle Emissions ◽  
Sampling Conditions ◽  
Medium Speed ◽  
Marine Diesel

scholarly journals Combustion and Exhaust Characteristics of Palm Oil in Medium Speed Marine Diesel Engine

2011 ◽  
Vol 46 (1) ◽  
pp. 127-132 ◽  
Author(s):  
Zhide Xu ◽  
Sumito Nishio ◽  
Masaru Ikame ◽  
Eiko Ishimura ◽  
Magoshiro Kuwabara
Keyword(s):  
Diesel Engine ◽  
Palm Oil ◽  
Marine Diesel Engine ◽  
Medium Speed ◽  
Marine Diesel

scholarly journals Fuel and Lubricant. Journal Movement Analysis of Main Bearing in Large Marine Diesel Engine.

2002 ◽  
Vol 37 (2) ◽  
pp. 151-157
Author(s):  
Iwao Sugimoto ◽  
Shinji Baba ◽  
Masao Yatsuo ◽  
Haruo Tanaka ◽  
Thoru Nakao
Keyword(s):  
Diesel Engine ◽  
Movement Analysis ◽  
Marine Diesel Engine ◽  
Main Bearing ◽  
Marine Diesel

scholarly journals Main Bearing Behavior of Marine Diesel Engine

2000 ◽  
Vol 35 (7) ◽  
pp. 482-488
Author(s):  
Iwao Sugimoto ◽  
Shinji Baba ◽  
Masao Yatsuo ◽  
Haruo Tanaka
Keyword(s):  
Diesel Engine ◽  
Marine Diesel Engine ◽  
Main Bearing ◽  
Marine Diesel ◽  
Bearing Behavior

Full Shafting-Based Elastohydrodynamic Lubrication Simulation for Main Bearings of Marine Diesel Engine

2012 ◽  
Vol 479-481 ◽  
pp. 1119-1123 ◽  
Author(s):  
Hui Xing ◽  
Hui Zhang ◽  
Qili Wu ◽  
Shu Lin Duan
Keyword(s):  
Diesel Engine ◽  
Marine Diesel Engine ◽  
Main Bearing ◽  
Film Pressure ◽  
Oil Film ◽  
Marine Diesel ◽  
Simulation Results ◽  
Lubrication Characteristics ◽  
The Impact ◽  
Oil Film Pressure

To predict and analyze accurately the lubrication characteristics and its influencing factors of main bearing for large low-speed two-stroke marine diesel engine, based on EHD lubrication model of dynamically loaded bearing, coupling simulation between EHD and MBD for main bearing of marine diesel engine was carried out. Systemic models were established separately considering the independent crankshaft of diesel engine and the full shafting of propulsion power plant. Main bearing load, peak oil film pressure, oil film pressure distribution, MOFT and orbital path in one working cycle under rated working conditions were investigated, and simulation results were compared based on both models. The results show that, if the impact of full shafting was considered, the lubrication characteristics of No.8 main bearing changed significantly, the lubrication characteristics of other main bearings were similar as the simulation results of the independent crankshaft model.

A Study on Reducing the NOx Emission of the L21/31 Medium-Speed Marine Diesel Engine for IMO Tier Emission Legislation

2013 ◽  
Vol 291-294 ◽  
pp. 1920-1924
Author(s):  
Min Xiao ◽  
Hui Chen
Keyword(s):  
Numerical Simulation ◽  
Diesel Engine ◽  
Fuel Injection ◽  
Nox Emission ◽  
Injection Timing ◽  
Marine Diesel Engine ◽  
Nox Emissions ◽  
Variable Parameters ◽  
Medium Speed ◽  
Marine Diesel

The KIVA-3V program was used to make numerical simulation for L21/31 type of medium-speed marine diesel engine about the NOx emissions and the affection of NOx changing process on different variable parameters under the Tier Ⅱstandard. On this basis, a discussion towards the NOx emission of the model fueling with dimethyl ether (DME) to meet the Tier Ⅲ standard is offered. The results show that reducing the intake temperature, load and speed, postponing the fuel injection timing and intake lag angle properly can decrease the NOx emissions within the limits of NOx in TierⅡ standard. Comparing the results of the numerical simulation of DME and diesel fuel, the NOx emission of the former one is 60.85% of the latter one, and the NOx emission of changing variable parameters on DME engine is 35.56% of the original type of diesel engine, very close to the Tier Ⅲ.

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