scholarly journals Improvement of Swirl Chamber Structure of Swirl-Chamber Diesel Engine Based on Flow Field Characteristics

2014 ◽  
Vol 6 ◽  
pp. 637813 ◽  
Author(s):  
Wenhua Yuan ◽  
Yi Ma ◽  
Jun Fu ◽  
Wei Chen
Keyword(s):  
Diesel Engine ◽  
Flow Field ◽  
Diesel Oil ◽  
Field Vector ◽  
Fuel Oil ◽  
Combustion Characteristic ◽  
Flat Bottom ◽  
Design And Optimization ◽  
Swirl Chamber ◽  
Dead Centre

In order to improve combustion characteristic of swirl chamber diesel engine, a simulation model about a traditional cylindrical flat-bottom swirl chamber turbulent combustion diesel engine was established within the timeframe of the piston motion from the bottom dead centre (BDC) to the top dead centre (TDC) with the fluent dynamic mesh technique and flow field vector of gas in swirl chamber and cylinder; the pressure variation and temperature variation were obtained and a new type of swirl chamber structure was proposed. The results reveal that the piston will move from BDC; air in the cylinder is compressed into the swirl chamber by the piston to develop a swirl inside the chamber, with the ongoing of compression; the pressure and temperature are also rising gradually. Under this condition, the demand of diesel oil mixing and combusting will be better satisfied. Moreover, the new structure will no longer forma small fluid retention zone at the lower end outside the chamber and will be more beneficial to the mixing of fuel oil and air, which has presented a new idea and theoretical foundation for the design and optimization of swirl chamber structure and is thus of good significance of guiding in this regard.

Particulate Emissions From a Two-Stroke Marine Diesel Engine Operated With Heavy Fuel Oil

2002 ◽  
Author(s):  
Tatsuro Tsukamoto ◽  
Kenji Ohe ◽  
Hiroshi Okada
Keyword(s):  
Diesel Engine ◽  
Sulfur Content ◽  
Diesel Oil ◽  
Fuel Oil ◽  
Particulate Emissions ◽  
Marine Diesel Engine ◽  
Heavy Fuel Oil ◽  
Particulate Emission ◽  
Marine Diesel ◽  
Test Engine

In these years, a problem of air pollution in a global scale becomes a matter of great concern. In such social situation, diesel engines are strongly required to reduce the NOx and particulate emission in the exhaust gas. In this paper, measurements of particulate emissions from a low speed two-stroke marine diesel engine were conducted with several kinds of diesel oil and a heavy fuel oil, to know the characteristics of particulate emissions at the present situation. The effects of engine load and sulfur content of the fuel on the particulate emission have been examined. The particulate emission from the test engine was measured by partial-flow dilution tunnel system, and particulate matter collected on the filter was divided into four components, SOF (soluble organic fraction), sulfate, bound water and dry soot, by Soxlet extraction and ion chromatograph. Results show that the particulate emission from the test engine operated with heavy fuel oil is three times as much as the value with diesel oil and that not only sulfate but SOF and dry soot concentration increase with the increase in fuel sulfur content. It is also found that the conversion rate from sulfur in fuel into sulfate in particulate matter is nearly independent of the sulfur content in the fuel and increases with the increase in the engine load.

Structure of Swirl Chamber of Turbulent Combustion Diesel Engine

2013 ◽  
Vol 448-453 ◽  
pp. 3408-3412
Author(s):  
Wen Hua Yuan ◽  
Yi Ma ◽  
Wu Qiang Long ◽  
Jun Fu ◽  
Yu Mei Liu
Keyword(s):  
Diesel Engine ◽  
Flow Field ◽  
Turbulent Combustion ◽  
Fuel Injection ◽  
Spherical Shape ◽  
Temperature Characteristic ◽  
Time Range ◽  
Swirl Chamber ◽  
Fuel Nozzle ◽  
High Temperature Area

Numerical simulation was conducted on three types of swirl chamber of turbulent combustion diesel engine, i.e. cone-shaped flat-bottomed, cylindrical flat-bottomed and spherical shape. The characteristics of flow field in cylinder were studied within the time range for the piston to move from BTDC 108°CA to BTDC 8°CA (at the instant of fuel injection), thus analyzed the changes of flow field in swirl chambers of such three different structures prior to fuel injection based on the velocity vector diagram at all times and the final temperature characteristic diagram of the flow field. The results show that: in the process of piston motion, an organized fierce vortex can be developed inside the swirl chamber, while in the vicinity of fuel nozzle, the air flow rate is 111.14m/s, 83.01m/s or 175.76m/s and the air temperature is 1384.15K, 1337.38K or 1350.46K respectively. A small fluid stagnation zone will be formed in the lower right end of the cone-shaped flat-bottomed swirl chamber or the cylindrical flat-bottomed swirl chamber and is adverse to the mixing of fuel and air. In comparison with the swirl chambers of other two structures, the smaller temperature gradient of fluid and the larger high-temperature area in the cylindrical swirl chamber are beneficial to the mixing of injected fuel and air.

Characteristic Comparison of Waste Rubber Derived Fuel and Fossil Fuel and Application Test in Engine

2014 ◽  
Vol 529 ◽  
pp. 383-386
Author(s):  
Ming Wei Shao ◽  
Ying Jeh Huang
Keyword(s):  
Fossil Fuel ◽  
Diesel Oil ◽  
Combustion Efficiency ◽  
Fuel Oil ◽  
Combustion Characteristic ◽  
Oil Consumption ◽  
Environment Friendly ◽  
Waste Gas ◽  
Waste Rubber ◽  
And Control

This study discussed characteristics and alkyl composition of waste rubber derived fuel oil, mix ratio of the derived fuel oil to fossil fuel on regulation and control performance of oil engine, waste gas emission and fuel combustion characteristic, and feasibility and suitability of regulation technologies when the derived fuel oil is applied to fuel engine. The findings show that cetane index increases after petroleum diesel is mixed the environment-friendly fuel oil. This can improve combustion efficiency of oil products in diesel engine, as well as reduce sulphur content in the oil and sulfur oxide emission of diesel oil, thus effectively eliminating impurities and reducing ash content after refining the blended environment-friendly fuel oil. Meanwhile, colloid and volatile gas can be eliminated effectively. By blending with petroleum diesel oil, the mixed fuel has the similar characteristics with that of traditional blended fossil oil. The combustion efficiency of mixed environment-friendly oil is improved, thus reducing oil consumption.

Effect of Al2O3 and SiO2 Metal Oxide Nanoparticles Blended with POME on Combustion, Performance and Emissions Characteristics of a Diesel Engine

2019 ◽  
Vol 16 (3) ◽  
pp. 6859-6873 ◽  
Author(s):  
M. A. Adzmi ◽  
A. Abdullah ◽  
Z. Abdullah ◽  
A. G. Mrwan
Keyword(s):  
Diesel Engine ◽  
Metal Oxide Nanoparticles ◽  
Peak Torque ◽  
Combustion Characteristic ◽  
Maximum Pressure ◽  
Single Cylinder ◽  
Engine Testing ◽  
Co Addition ◽  
Carbon Dioxide Co2 ◽  
Test Fuel

Evaluation of combustion characteristic, engine performances and exhaust emissions of nanoparticles blended in palm oil methyl ester (POME) was conducted in this experiment using a single-cylinder diesel engine. Nanoparticles used was aluminium oxide (Al2O3) and silicon dioxide (SiO2) with a portion of 50 ppm and 100 ppm. SiO2 and Al2O3 were blended in POME and labelled as PS50, PS100 and PA50, PA100, respectively. The data results for PS and PA fuel were compared to POME test fuel. Single cylinder diesel engine YANMAR TF120M attached with DEWESoft data acquisition module (DAQ) model SIRIUSi-HS was used in this experiment. Various engine loads of zero, 7 N.m, 14 Nm, 21 N.m and 28 N.m at a constant engine speed of 1800 rpm were applied during engine testing. Results for each fuel were obtained by calculating the average three times repetition of engine testing. Findings show that the highest maximum pressure of nanoparticles fuel increase by 16.3% compared to POME test fuel. Other than that, the engine peak torque and engine power show a significant increase by 43% and 44%, respectively, recorded during the PS50 fuel test. Meanwhile, emissions of nanoparticles fuel show a large decrease by 10% of oxide of nitrogen (NOx), 6.3% reduction of carbon dioxide (CO2) and a slight decrease of 0.02% on carbon monoxide (CO). Addition of nanoparticles in biodiesel show positive improvements when used in diesel engines and further details were discussed.  

scholarly journals Numerical and Experimental Investigation of Combustion and Knock in a Dual Fuel Gas/Diesel Compression Ignition Engine

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
A. Gharehghani ◽  
S. M. Mirsalim ◽  
S. A. Jazayeri
Keyword(s):  
Natural Gas ◽  
Diesel Oil ◽  
Combustion Characteristic ◽  
Simultaneous Increase ◽  
Dual Fuel ◽  
Compression Ignition ◽  
Swirl Ratio ◽  
Characteristic Analysis ◽  
Mode Of Operation ◽  
Intake Pressure

Conventional compression ignition engines can easily be converted to a dual fuel mode of operation using natural gas as main fuel and diesel oil injection as pilot to initiate the combustion. At the same time, it is possible to increase the output power by increasing the diesel oil percentage. A detailed performance and combustion characteristic analysis of a heavy duty diesel engine has been studied in dual fuel mode of operation where natural gas is used as the main fuel and diesel oil as pilot. The influence of intake pressure and temperature on knock occurrence and the effects of initial swirl ratio on heat release rate, temperature-pressure and emission levels have been investigated in this study. It is shown that an increase in the initial swirl ratio lengthens the delay period for auto-ignition and extends the combustion period while it reduces NOx. There is an optimum value of the initial swirl ratio for a certain mixture intake temperature and pressure conditions that can achieve high thermal efficiency and low NOxemissions while decreases the tendency to knock. Simultaneous increase of intake pressure and initial swirl ratio could be the solution to power loss and knock in dual fuel engine.

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