Experimental Investigations on a Hydrogen-Diesel Dual Fuel Engine at Different Compression Ratios

2006 ◽  
Vol 129 (2) ◽  
pp. 572-578 ◽  
Author(s):  
M. Masood ◽  
S. N. Mehdi ◽  
P. Ram Reddy
Keyword(s):  
Compression Ratio ◽  
Performance Characteristics ◽  
Experimental Investigations ◽  
Simultaneous Increase ◽  
Dual Fuel ◽  
Inlet Temperature ◽  
Compression Ignition Engine ◽  
Different Temperatures ◽  
Rate Of Heat Release ◽  
Hydrogen Substitution

An experimental investigation was carried out on a computer interfaced single cylinder variable compression ratio, compression ignition engine to optimize the performance characteristics and to find the useful higher compression ratio (UHCR) with hydrogen-diesel dual fuel mode. Experimentations were conducted on five different compression ratios and the performance characteristics were calculated. The effect of blending on NOx, HC, CO, and particulate matter were measured and reported. The rate of heat release and speed of combustion with increase in compression ratio with simultaneous increase in hydrogen substitution were measured. Intake temperature of air was increased and for three different temperatures, the effect of increase in temperature of air-hydrogen mixture on NOx were studied and found that there was a sharp increase in the NOx value as the inlet temperature was increased from 65 to 85°C.

scholarly journals Implementation and Parameter Analysis of the Knock Phenomenon of a Marine Dual-Fuel Engine Based on a Two-Zone Combustion Model

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 602
Author(s):  
Fang-Kun Zou ◽  
Hong Zeng ◽  
Huai-Yu Wang ◽  
Xin-Xin Wang ◽  
Zhao-Xin Xu
Keyword(s):  
Natural Gas ◽  
Air Temperature ◽  
Compression Ratio ◽  
Operating Parameter ◽  
Parameter Analysis ◽  
Combustion Model ◽  
Dual Fuel ◽  
Inlet Temperature ◽  
Dimensional Model ◽  
Engine Knock

The stable working window of a dual-fuel engine is narrow, and it is prone to knock during operation. The occurrence of knock limits the load and torque output of a dual-fuel engine, and even causes engine damage in severe cases. The existing volumetric model of marine dual-fuel engine has little research on the related problems of knock simulation. In order to analyze the causes of knock phenomenon and the influence of operating parameter changes on knock, under the Matlab/Simulink simulation environment, a quasi-dimensional model was established with MAN 8L51/60DF dual-fuel engine as the prototype, and the model was calibrated using the bench data. The knock intensity index coefficient (KI) was used as the evaluation index of knock intensity. Three parameters, the intake air temperature, compression ratio, and natural gas intake, were selected as variables to simulate the engine. According to the analysis of the simulation results, the influence of the parameter changes on the occurrence of engine knock phenomenon and knock intensity could be further studied. The results showed that the combination of the KI model and the quasi-dimensional model could effectively and accurately predict the engine performance and knock trend. The change of gas inlet quality, compression ratio, and inlet temperature could promote the occurrence of detonation, the engine knock could be avoided by controlling the intake air temperature below 336 K, compression ratio not exceeding 15 or the intake volume of natural gas per cycle not exceeding 11.25 g/cycle.

scholarly journals Combustion and emission characteristics of a compression ignition engine operated on dual fuel mode using renewable and sustainable fuel combinations

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
V. S. Yaliwal ◽  
N. R. Banapurmath
Keyword(s):  
Thermal Efficiency ◽  
Chemical Properties ◽  
Intake Manifold ◽  
Experimental Investigations ◽  
Dual Fuel ◽  
Emission Characteristics ◽  
Producer Gas ◽  
Compression Ignition Engine ◽  
Constant Flow Rate ◽  
Hydrogen Addition

AbstractThe present experimental study aims to examine the combustion and emission characteristics of a single cylinder four stroke direct injection diesel engine operated in dual fuel mode using dairy scum oil methyl ester (DiSOME) and its blend (B20)—producer gas combination with and without addition of hydrogen. DiSOME/B20-producer gas combination without hydrogen addition exhibited inferior performance with increased hydrocarbon and carbon monoxide emissions owing to poor physic-chemical properties of both biodiesel and inducted low calorific value gas (producer gas) compared to the same fuel combination with hydrogen. Producer gas was inducted along with air, and hydrogen was allowed to mix with air-producer gas combination in the intake manifold. Experimental investigations were conducted at all load conditions and at constant flow rate of hydrogen (8 lpm). It was noticed that that B20-hydrogen enriched producer gas combination with optimum parameters resulted in amplified thermal efficiency with reduced emission levels compared to the operation with B20/DiSOME-producer gas combination. However, investigation showed that diesel-producer gas combination with hydrogen addition provided amplified brake thermal efficiency by 3.8%, 16.4% and 13.2% compared to the diesel/DiSOME/B20—producer gas combinations, respectively, at 80% load. Hydrogen addition provided enhanced cylinder pressure and heat release rate with reduced emission levels except nitric oxide emissions. It can be concluded that the deprived combustion associated with DiSOME/B20-producer gas combination can be improved with hydrogen addition. The combination of DiSOME-producer gas operation with hydrogen addition is uniqueness of this present work.

A Critique on the Research Activities and Potential Benefits of Dual-Fuel Diesel Engines Run on Biogas and Oxygenated Liquid Fuels

2019 ◽  
Vol 141 (6) ◽  
Author(s):  
Achinta Sarkar ◽  
Ujjwal K. Saha
Keyword(s):  
Flow Rate ◽  
Compression Ratio ◽  
Diesel Engines ◽  
Performance Characteristics ◽  
Gaseous Fuel ◽  
Liquid Fuels ◽  
Dual Fuel ◽  
Injection Timing ◽  
Depth Analysis ◽  
Overall Performance

The dual fuel concept of diesel engines is gaining popularity because of their ability to use alternative renewable gaseous fuels (natural gas, biogas, producer gas) and liquid fuels (biodiesel, alcohol, and others) simultaneously. The dual fuel mode (DFM) not only reduces the consumption of diesel or substitutes the diesel fuel, but there is an advantage of operating the engine in pure diesel mode (PDM) in case of shortage of gaseous primary fuel. The uses of renewable fuels in such engines have the positive impact on green ecosystem in terms of reduction in NOx and smoke emissions; however, there is the engine derating as performance penalty in comparison to engines operating under PDM. The most influential parameters in DFM engines are the type and flow rate of inducted gaseous fuel, fuel–air equivalence ratio (Φglobal), compression ratio (CR), and injection timing (IT). During the last few decades, the researchers have studied the effect of various parameters to improve the overall performance characteristics (performance, combustion, and emission) of DFM engines. This paper makes an in-depth analysis to unveil the physical characteristics of the crucial parameters of DFM engines with specific reference to the use of biogas with ternary blends (TB) of diesel, biodiesel, and ethanol. The paper addresses the issues on how the gaseous fuel flow rate, preheating of the intake charge, compression ratio, injection timing, and the type of oxygenated fuels dominate the overall performance characteristics.

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