scholarly journals Combustion Fault Simulation of Diesel Engine Based on AVL-FIRE Software

2021 ◽  
Author(s):  
Junfu Yuan ◽  
Chunsheng Zhao
Keyword(s):  
Diesel Engine ◽  
Fault Simulation ◽  
Complex Structure ◽  
Combustion Process ◽  
Calculation Model ◽  
Marine Diesel Engine ◽  
Marine Diesel ◽  
Cause Of Failure ◽  
Engine System ◽  
Engine Failure

Marine diesel engine is developing towards the direction of precision, automation and systematization, and it has the characteristics of complex structure and many parts. If it breaks down, it will affect the operation safety of the whole ship. If it is serious, accidents may occur, which may cause maritime accidents. Therefore, how to prevent the occurrence of marine diesel engine failure and analyze the cause of failure after the accident has been paid more and more attention by scholars at home and abroad. In the simulation study of the working process of diesel engine, for different types of diesel engines, the laws of combustion process are different, even for the same diesel engine in different working conditions, the combustion laws are also different, which will cause great difficulties to study the combustion process. Using computer simulation technology, the physical calculation model of diesel engine system is established by simulating the typical combustion faults of marine diesel engine. AVL-FIRE software is used to simulate different faults of diesel engine combustion process, and the changes of various performance parameters of diesel engine under corresponding faults are obtained, so as to grasp its working state macroscopically, and provide relevant basis for the design, optimization and operation management of diesel engine system.

scholarly journals Estimation of Marine Diesel Engine System Oil by Infrared Spectroscopy

1998 ◽  
Vol 33 (6) ◽  
pp. 448-454
Author(s):  
Fuyuki Hirata ◽  
Hideo Watanuma ◽  
Yukiko Shima ◽  
Haruo Miyano
Keyword(s):  
Infrared Spectroscopy ◽  
Diesel Engine ◽  
Marine Diesel Engine ◽  
Marine Diesel ◽  
Engine System

Numerical Calculation of Spray and Combustion with Heating Fuel in a Medium Speed Diesel Engine

2013 ◽  
Vol 316-317 ◽  
pp. 1162-1165
Author(s):  
Xiao Yi Lai ◽  
Cheng Cheng Zhang ◽  
Zhou Rong Zhang ◽  
Jian Zhi Li ◽  
Qian Wang
Keyword(s):  
Surface Tension ◽  
Diesel Engine ◽  
Combustion Process ◽  
High Viscosity ◽  
Calculation Model ◽  
Low Temperature Combustion ◽  
Fuel Temperature ◽  
Marine Diesel ◽  
Set Up ◽  
Cfd Method

The fuel usually has high viscosity and low quality for marine diesel engines. Especially for its shallow combustion chamber structures, the preparation of in-cylinder mixture gas is mainly rely on spray and atomization, which is vulnerable influenced by fuel viscosity and surface tension seriously. Based on the case, this paper introduced a CFD method to heat the diesel fuel to reduce fuel viscosity and surface tension, expecting to explore the in-cylinder combustion process and emissions generation, so that the atomization effect of fuel spray and combustion in diesel could be improved. The calculation model was set up according to the L23/30H diesel engine. Temperature field and pressure field in cylinder were calculated and the emission of NO were studied under conditions of different fuel temperatures. The results show that the increasing of fuel temperature is helpful to realize low-temperature combustion and reduce NO emission to some extent.

scholarly journals An Experimental Investigation into Combustion Fitting in a Direct Injection Marine Diesel Engine

2018 ◽  
Vol 8 (12) ◽  
pp. 2489 ◽  
Author(s):  
Yu Ding ◽  
Congbiao Sui ◽  
Jincheng Li
Keyword(s):  
Experimental Investigation ◽  
Diesel Engine ◽  
Process Model ◽  
Direct Injection ◽  
Combustion Process ◽  
Operating Conditions ◽  
Marine Diesel Engine ◽  
Test Bed ◽  
Engine Combustion ◽  
Marine Diesel

The marine diesel engine combustion process is discontinuous and unsteady, resulting in complicated simulations and applications. When the diesel engine is used in the system integration simulation and investigation, a suitable combustion model has to be developed due to compatibility to the other components in the system. The Seiliger process model uses finite combustion stages to perform the main engine combustion characteristics and using the cycle time scale instead of the crank angle shortens the simulation time. Obtaining the defined Seiliger parameters used to calculate the engine performance such as peak pressure, temperature and work is significant and fitting process has to be carried out to get the parameters based on experimental investigation. During the combustion fitting, an appropriate mathematics approach is selected for root finding of non-linear multi-variable functions since there is a large amount of used experimental data. A direct injection marine engine test bed is applied for the experimental investigation based on the combustion fitting approach. The results of each cylinder and four-cylinder averaged pressure signals are fitted with the Seiliger process that is shown separately to obtain the Seiliger parameters, and are varied together with these parameters and with engine operating conditions to provide the basis for engine combustion modeling.

Failure Mode and Effects Analysis of Equipment Based on Grey Theory

2013 ◽  
Vol 313-314 ◽  
pp. 763-766 ◽  
Author(s):  
Zhen Dong Tan ◽  
Zun Feng Du
Keyword(s):  
Diesel Engine ◽  
Failure Modes ◽  
Triangular Fuzzy Number ◽  
Calculation Model ◽  
Grey Theory ◽  
Marine Diesel Engine ◽  
Relative Importance ◽  
Risk Levels ◽  
Decision Factors ◽  
Marine Diesel

Based on the uncertaintyproblem of decision factors in the fault diagnosis and maintenance ofequipment, the fuzzy method and grey theory were introduced. Firstly, fuzzyterms were applied to describe the basic variables (probability of occurrence,severity and detection). Triangular fuzzy number was selected to carry out thequantitative calculation of fuzzy terms and the defuzzification of membershipfunctions. Then the grey correlations of all Failure modes were computed andrisks were ranked, considering the relative importance of decision factors. Thefuel system of marine diesel engine was taken as an example. It is pointed thatalthough the risk priority numbers are equal, if the values or weights ofdecision factors are different, then the risk levels of Failure modes aredifferent as well. The results indicate that the calculation model can identifythe failures of ship equipment more precisely and optimize allocation ofmaintenance resources.

Consideration of split injection strategy for marine diesel engine combustion process

2019 ◽  
Author(s):  
Frengki Mohamad Felayati ◽  
Semin ◽  
Muhammad Badrus Zaman ◽  
Ayudhia Pangestu Gusti
Keyword(s):  
Diesel Engine ◽  
Combustion Process ◽  
Marine Diesel Engine ◽  
Split Injection ◽  
Injection Strategy ◽  
Engine Combustion ◽  
Marine Diesel

NUMERICAL STUDY ON NOX EMISSION REDUCTION MECHANISM OF HCCI MARINE DIESEL ENGINE FOR IMO TIER III EMISSION LIMITS

2021 ◽  
Vol 159 (A2) ◽  
Author(s):  
B Li ◽  
H T Gao
Keyword(s):  
Diesel Engine ◽  
Emission Reduction ◽  
Numerical Study ◽  
Combustion Process ◽  
Reduction Rate ◽  
Marine Diesel Engine ◽  
Oxides Of Nitrogen ◽  
Nox Formation ◽  
Marine Diesel ◽  
Main Component

With the advantages of ultra-low emissions of oxides of nitrogen (NOX) and high thermal efficiency, the homogeneous charge compression ignition (HCCI) mode applied to marine diesel engine is expected to be one of the technical solutions to meet the International Maritime Organization (IMO) MARPOL73/78 Convention-Annex VI Amendment Tier III requirement. According to the NOX chemical reaction mechanism, taking a marine diesel engine as the application object, the numerical study on the NOX formation characteristics of n-heptane for HCCI combustion process is performed. The results indicate that NO is usually the main component in the generation and emissions of NOX with the n-heptane HCCI mode. The combustor temperature plays more important role in the proportion of NO generation and emission. Compared with the experimental data of conventional marine diesel engine, the emission reduction rate of NOX can achieve an average of more than 95% in using HCCI technology.

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