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 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 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.

Experiment Study of Performance, Combustion Process, and NOX Emission of Diesel Engine with Air-Cooled Angle Globe Valve EGR

2020 ◽  
Vol 35 ◽  
pp. 69-76
Author(s):  
Aguk Zuhdi Muhammad Fathallah ◽  
Anugrah Des Putra
Keyword(s):  
Diesel Engine ◽  
Combustion Process ◽  
Air Cooling ◽  
Tier 2 ◽  
Marine Diesel ◽  
Valve Opening ◽  
Institute Of Technology ◽  
Marine Engineering ◽  
Globe Valve ◽  
Tier 3

IMO ANNEX VI has enacted TIER III since 2016; one of the regulated emissions is NOX. The effective NOX reducing method is by using Exhaust Gas Recirculation (EGR). EGR valve with air-cooled angle globe valve type has been developed in Marine Diesel Laboratory, Department of Marine Engineering, Sepuluh Nopember Institute of Technology (ITS). EGR is in use on the Yanmar TF 85-MHDI diesel engine to study performance of engine, combustion processes, and NOX emitted experimentally. EGR varies from 0, 10, 20, and 30% respectively. To learn the performance of engine speed varied from 1800-2200 rpm. While the combustion process and NOX follow of IMO ANNEX VI. EGR without air cooling (HOT-EGR) is also studied for use as a reference of COLD-EGR achievement. The result of emission examine according to statistical data that modified diesel engine with HOT-EGR and COLD-EGR system are able to be within the threshold of emission test in TIER 2, at EGR valve opening 20% and 30% for load of 25%, 50%, and 75%. While for 100% load at EGR valve opening of 20% and 30%, the emission of diesel engine is capable of entering the TIER 3. In terms of performance the SFOC value can be improved on 10% of COLD-EGR condition with decrease of 14.62%, result for combustion process Peak pressure on the diesel engine becomes low and the heat release decreases.

A Study on Reasonable Ratios of Vegetable Oils and Diesel Oil in Mixed Fuel Used as an Alternative Fuel for Marine Diesel Engines in Vietnam

2019 ◽  
Vol 889 ◽  
pp. 244-253
Author(s):  
The Nam Tran ◽  
Van Uy Dang ◽  
Dai An Nguyen
Keyword(s):  
Diesel Engine ◽  
Vegetable Oil ◽  
Fuel Mixture ◽  
High Viscosity ◽  
Diesel Oil ◽  
Negative Effects ◽  
Injection Process ◽  
Straight Vegetable Oil ◽  
Marine Engines ◽  
Marine Diesel

Vegetable oil is used directly as a fuel, in either modified or unmodified equipment, it is referred to as straight vegetable oil (SVO). SVOs have some advantages in comparison with fossil fuel oils such as: renewability, local availability, lower sulfur content, etc. avoiding the environmental effects caused by sulfuric acid, lower aromatic content and high biodegradability. However, SVOs are also attached to several disadvantages such as: high viscosity, low heating value, high fatty contents, influencing on injection process and causing engine coking if misused. In order to prevent such negative effects of diesel engine fuelled by SVO, one of potential solutions is using blends of SVO with diesel oil (DO). In such case, the reasonable ratio of SVO and diesel oil plays a very important role for normal running condition, but also seems to be challenge to identify. The article shows results of a study on defining the ratio for marine diesel application. It is firstly based on the assessment on the heat release processes inside the diesel engine cylinder upon a specific simulation with different blends of SVO and diesel oil. In comparison with the particular requirements for fuel of marine engines, the preferable percentage of vegetable oil in the fuel mixture is pointed out. And finally, the experiments with fuel system of a typical marine diesel engine, HANSHIN 6LU32, installed at the lab of Vietnam Maritime University in terms of checking real engine’s operation and reducing harmful emissions.

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

Research on Emission Control of Marine Diesel Engine

2012 ◽  
Vol 430-432 ◽  
pp. 1198-1202 ◽  
Author(s):  
Guo Jin Chen ◽  
Zhong Min Liu ◽  
Ting Ting Liu ◽  
Shao Hui Su ◽  
Guang Jie Yuan ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Fuel Injection ◽  
Combustion Process ◽  
Emission Control ◽  
Test System ◽  
Injection System ◽  
Low Speed ◽  
Emission Regulations ◽  
Marine Diesel ◽  
Relationship Of

In response to the increasingly stringent diesel emission regulations, the paper analyzes the relationship of the low-speed marine diesel engine's emission with the combustion process, the fuel injection law, the exhaust recirculation and the SCR. Then the scheme of the fuel injection system with the high-pressure common rail for the low-speed diesel engine is proposed, and the test system for the diesel engine's emission performance is established. Through the experimental research, the optimization and matching technology for the diesel combustion process based on the emission control is analyzed, and the best injection law of the diesel engine is revealed under the different conditions. That will provide the technical support for the design and operating management of the diesel engine.

Inverse Design of Performance on a Long-Stroke Sequential Turbocharging Diesel Engine

2009 ◽  
Vol 419-420 ◽  
pp. 385-388
Author(s):  
Yang Wang ◽  
Yin Yan Wang ◽  
Ming Zhu Liu ◽  
Xiang Wei Jin
Keyword(s):  
Diesel Engine ◽  
Calculation Model ◽  
Inverse Design ◽  
Performance Parameters ◽  
Working Process ◽  
Software Simulation ◽  
Model Method ◽  
Set Up ◽  
Long Stroke ◽  
Selection Of

Based on GT-POWER software, simulation model of working process of a long-stroke sequential turbocharging (STC) diesel engine is set up, the calculated result tends to be in agreement with the experimental ones. It proves that the calculation model,method and the selection of the relative parameters are reasonable and the model could predict and improve the performance of the diesel well. To avoid the surging problem and extend its working area, performance parameters of diesel which uses STC with bypass are calculated and compared with experimental data. The paper mainly analyzes the performance and running process of diesel. Finally, the switch point and bypass area of STC are confirmed.

Simulation Investigation about Combustion and Emission Characteristics of n-Butanol/Diesel Fuel Mixture on Diesel Engine

2014 ◽  
Vol 541-542 ◽  
pp. 763-768 ◽  
Author(s):  
Jian Wu ◽  
Hong Ming Wang ◽  
Li Li Zhu ◽  
Yang Hua
Keyword(s):  
Diesel Engine ◽  
Diesel Fuel ◽  
Combustion Process ◽  
Fuel Mixture ◽  
Calculation Model ◽  
Emission Characteristics ◽  
Test Results ◽  
Combustion Pressure ◽  
Indicator Diagram ◽  
Simulation Results

In this paper, combustion process was simulated on diesel engine with n-butanol/diesel blends in 3000 r/min, 300 Nm using AVL FIRE ESE Diesel. By comparison with indicator diagram, simulation results were consistent with the test results using pure diesel and 5%(volume of n-butanol) n-butanol/diesel blends. Using the calculation model combustion in cylinder is calculated burning B10(mass friction of n-butanol is 10%), B20 and B30 n-butanol /diesel mixture. The results show that the maximum combustion pressure and temperature gradually increases, and accumulated heat of release slightly reduces with the adding of n-butanol. BSFC increases, but indicated efficiency reduces. Mass friction of soot significantly reduce, and mass friction of NOx firstly decreases then increases with the adding of n-butanol. This will provide a basis to the research of n-butanol as substitute fuel.

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