Experimental Study of Methane Fuel Oxycombustion in an SI Engine

2012 ◽  
Author(s):  
Andrew Van Blarigan ◽  
Darko Kozarac ◽  
Reinhard Seiser ◽  
Robert Cattolica ◽  
Jyh-Yuan Chen ◽  
...  
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Compression Ratio ◽  
Thermal Efficiency ◽  
Combustion Efficiency ◽  
Working Fluid ◽  
Si Engine ◽  
Lower Efficiency ◽  
Working Fluids ◽  
Spark Timing

An experimental investigation of the thermal efficiency, combustion efficiency, and CoV IMEP, of methane fuel oxycombustion in an SI engine has been carried out. Compression ratio, spark-timing, and oxygen concentration were all varied. A variable compression ratio SI engine was operated on both wet and dry EGR working fluids, with results illustrating that the efficiency of the engine operating with a large amount of EGR was significantly reduced relative to methane-in-air operation over all oxygen concentrations and compression ratios. The maximum thermal efficiency of wet EGR, dry EGR, and air was found to be 23.6%, 24.2%, and 31.4%, respectively, corresponding to oxygen volume fractions of 29.3%, 32.7% and 21%. Combustion efficiency was above 98% for wet EGR and approximately 96% for dry EGR. CoV IMEP was low for both cases. The much lower efficiency of both EGR cases relative to air is primarily a result of the reduced specific-heat ratio of the EGR working fluids relative to air working fluid.

scholarly journals Effects of CNG Injection Pressure on Performance, Emission and Combustion Characteristics of Multi-cylinder SI Engine

2019 ◽  
Vol 8 (3) ◽  
pp. 2383-2387
Keyword(s):  
Compression Ratio ◽  
Fuel Injection ◽  
Injection Pressure ◽  
Injection System ◽  
Combustion Analysis ◽  
Si Engine ◽  
Performance And Emission ◽  
Port Fuel Injection ◽  
Spark Timing ◽  
Fuel Injection Pressure

This Paper shows the effect of port fuel injection pressure of CNG in 3-cylinder SI Engine at Wide Open Throttle position using sequential port fuel injection system. All trials are performed on 4-stroke, 796 cc MPFI S.I engine at injection pressure of 2.0, 2.2, 2.4, 2.6, 2.8 bar for constant speed of 2500, 3000, 3500, 4000 & 4500 rpm. During the trial compression ratio is kept constant at 9.2 with Maximum Brake Torque (MBT) spark timing of 15oBTDC. Optimum torque is obtained for CNG at injection pressure of 2.6 bar and 3000 rpm. Gasoline trials are performed at same compression ratio for comparison with CNG at same injection pressure. Performance and emission characteristics with combustion analysis are performed at optimum injection pressure of 2.6 bar.

Thermodynamic analysis of using ethanol-methanol-gasoline (GEM) blends in a turbocharged, spark-ignition engine

2021 ◽  
pp. 1-28
Author(s):  
Hongqing Feng ◽  
Shuwen Xiao ◽  
Zhirong Nan ◽  
Di Wang ◽  
Chaohe Yang
Keyword(s):  
Thermal Efficiency ◽  
Fossil Fuel ◽  
Spark Ignition ◽  
Exergy Efficiency ◽  
Spark Ignition Engine ◽  
Low Carbon ◽  
Si Engine ◽  
Engine Load ◽  
Maximum Value ◽  
Spark Timing

Abstract Low-carbon alcohols have been universally acknowledged as an alternative to fossil fuel in the world, which is environmentally friendly and clean. In this paper, the detailed exergy and energy analysis were carried out on a turbocharged, spark-ignition (SI) engine fueled with methanol-ethanol-gasoline (GEM) under non-knock conditions. The results indicated that increasing the alcohols proportion in blends could slightly improve the exergy efficiency and thermal efficiency and increase the percentage of total irreversibility in the total exergy. The thermal efficiency and exergy efficiency increased to a maximum value and then decreased, while the proportion of total irreversibility in the total exergy increased significantly with the spark timing retarded from the earliest timing. The exergy efficiency and thermal efficiency increased as the engine load increased. Additionally, the total irreversibility increased but the proportion of total irreversibility in the total exergy presented a trend of decreasing as the engine load increased.

The Effect of Material Properties on the Thermal Efficiency of the Minto Solar Wheel

1980 ◽  
Vol 102 (2) ◽  
pp. 504-507 ◽  
Author(s):  
S. Lin ◽  
R. Bhardwaj
Keyword(s):  
Thermal Performance ◽  
Thermal Efficiency ◽  
Material Properties ◽  
Working Fluid ◽  
Working Fluids ◽  
Mean Diameter ◽  
The Mean ◽  
The Ideal

The characteristic of the thermal performance of the Minto solar wheel is that its thermal efficiency is strongly dependent on the material properties of the working fluid. For a specified working fluid, the thermal efficiency of the ideal cycle of the Minto solar wheel is dependent only on the mean diameter of the wheel. To study the effect of the material properties of the working fluid on the ideal thermal efficiency, 14 working fluids are selected, and their thermal efficiencies as functions of the mean diameter of the wheel are calculated and compared with each other. Among these fluids, R-12, R-115, R-500, R-22 and R-13B1 achieve better thermal performance than the others.

scholarly journals Comparison between Organic Working Fluids in order to Improve Waste Heat Recovery from Internal Combustion Engines by means of Rankine Cycle Systems

2020 ◽  
Vol 71 (1) ◽  
pp. 113-121
Author(s):  
Alexandru Racovitza ◽  
Horatiu Pop ◽  
Valentin Apostol ◽  
Tudor Prisecaru ◽  
Daniel Taban
Keyword(s):  
Thermal Efficiency ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Internal Combustion Engines ◽  
Waste Heat ◽  
Rankine Cycle ◽  
Internal Combustion ◽  
Working Fluid ◽  
Working Fluids ◽  
Cycle Systems

The present works deals with waste heat recovery from internal combustion engines using Rankine cycle systems where working fluid are organic liquids (ORC). The first part of the paper presents the ORC technology as one of the most suitable procedure for waste heat recovery from exhaust gas of internal combustion engine (ICE). The particular engine considered in the present work is a turbocharged compression ignition engine mounted on an experimental setup. The working fluids for ORC system are: isobutene, propane, RE245fa2, RE245cb2, R245fa, R236fa, R365mfc, R1233zd(E), R1234yf and R1234ze(Z). Experimental data derived from the experimental setup has been used for 40%, 55% and 70% engine load. This papers focusses on superheating increment, on thermal efficiency and on net power output, obtained with each working fluids in Rankine cycle. Results point out the superheating increment that gives the highest thermal efficiency for each working fluid. The highest thermal efficiency is achieved in case of using R1233zd(E) as working fluid. In case of using R1233zd(E) as working fluid at 40 % load of the engine, the output power of the Rankine cycle is 3.6 kW representing 6.2 %, from the rated power at this load; at 55% load it is 5.7 kW representing 6.7 % the rated power and at 70% it is 6.7 kW representing 6.5 % from the rated power. Future perspectives are given.

scholarly journals Pure and Hydrocarbon Binary Mixtures as Possible Alternatives Working Fluids to the Usual Organic Rankine Cycles Biomass Conversion Systems

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4140 ◽  
Author(s):  
Costante M. Invernizzi ◽  
Abubakr Ayub ◽  
Gioele Di Marcoberardino ◽  
Paolo Iora
Keyword(s):  
Binary Mixtures ◽  
Biomass Conversion ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Thermodynamic Efficiency ◽  
Operating Pressure ◽  
Lower Efficiency ◽  
Working Fluids ◽  
Noticeable Increase

This study investigates the use of pure and hydrocarbons binary mixtures as potential alternatives working fluids in a usual biomass powered organic Rankine cycle (ORC). A typical biomass combined heat and power plant installed in Cremona (Italy) is considered as the benchmark. Eight pure hydrocarbons (linear and cyclic) and four binary mixtures of linear hydrocarbons were selected. The critical points of the binary mixtures at different composition were calculated using an in-house code developed in MATLAB© (R2018b) environment. Based on the critical point of a working fluid, supercritical and subcritical cycle configurations of ORC were analysed. A detailed thermodynamic comparison with benchmark cycle was carried out in view of cycle efficiency, maximum operating pressure, size of the turbine and heat exchangers. The supercritical cycles showed 0.02 to 0.03 points lower efficiency, whereas, subcritical cycles showed comparable efficiencies than that of the benchmark cycle. The cycles operating with hydrocarbons (pure and mixtures) exhibited considerably lower volume flow ratios in turbine which indicates lower turbine size. Also, size parameter of regenerator is comparatively lower due to the lower molecular complexity of the hydrocarbons. A noticeable increase in turbine power output was observed with change in composition of the iso-octane/n-octane binary mixture at the same thermodynamic efficiency.

Effect of the Working Fluid on Performance of the ORC and Combined Brayton/ORC Cycle

2017 ◽  
Author(s):  
Alireza Javanshir ◽  
Nenad Sarunac
Keyword(s):  
Thermal Efficiency ◽  
Organic Rankine Cycle ◽  
Combined Cycle ◽  
Operating Conditions ◽  
Cycle Performance ◽  
Working Fluid ◽  
Working Fluids ◽  
Power Cycles ◽  
Topping Cycle ◽  
Selection Of

This study focuses on the power cycles such as organic Rankine cycle (ORC) and combined regenerative Brayton/ORC. The selection of working fluids and power cycles is traditionally conducted by trial and error method and performing a large number of parametric calculations over a range of operating conditions. A methodology for selection of optimal working fluid based on the cycle operating conditions and thermophysical properties of the working fluids was developed in this study. Thermodynamic performance (thermal efficiency and net power output) of a simple subcritical and supercritical ORC was analyzed over a range of operating conditions for a number of working fluids to determine the effect of operating parameters on cycle performance and select the best working fluid. New expressions for thermal efficiency of a simple ORC are proposed. In case of a regenerative Brayton/ORC, the results show that CO2 is the best working fluid for the topping cycle. Depending on the exhaust temperature of the topping cycle, Isobutane, R11 and Ethanol are the preferred working fluids for the bottoming (ORC) cycle, resulting in highest efficiency of the combined cycle. Finally, a performance map is presented as guidance for selection of the best working fluid for specific cycle operating conditions.

Performance Analysis and Comparison of Air Standard Diesel and Diesel-Atkinson Cycles

2013 ◽  
Vol 9 ◽  
pp. 57-65
Author(s):  
Mojtaba Beigzad Abbassi ◽  
Mohamad Hashemi Gahruei ◽  
Saeed Vahidi ◽  
Hamed Shahmirzae Jeshvaghani
Keyword(s):  
Heat Transfer ◽  
Performance Analysis ◽  
Specific Heat ◽  
Output Power ◽  
Compression Ratio ◽  
Thermal Efficiency ◽  
Working Fluid ◽  
Maximum Output ◽  
Specific Heat Ratio ◽  
Atkinson Cycle

This study is concerned with the performance analysis and comparison of air standard Diesel and Diesel-Atkinson cycles with heat-transfer loss, friction like term loss and variable specific-heat ratio of the working fluid based on finite-time thermodynamics. Also numerical examples are detailed to show the relations between the output power and the compression ratio, between the thermal efficiency and the compression ratio, as well as the optimal relation between the output power and the thermal efficiency of both cycles. Furthermore, the effects of variable specific-heat ratio of the working fluid, heat transfer and the friction-like term loss on the performance of both irreversible cycles are analyzed. Comparison of the performance of cycles shows that the heat efficiency and the output power of an air standard Diesel-Atkinson are higher than the Diesel ones and the points of maximum output power and thermal efficiency of Diesel-Atkinson cycle occur at the lower compression ratio. Reduction of Noxis another advantage of Diesel-Atkinson cycle. The results obtained in this paper provide guidance for the design of Diesel and Diesel-Atkinson engines.

Experimental Study of Methane Fuel Oxycombustion in a Spark-Ignited Engine

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Andrew Van Blarigan ◽  
Darko Kozarac ◽  
Reinhard Seiser ◽  
Robert Cattolica ◽  
Jyh-Yuan Chen ◽  
...  
Keyword(s):  
Oxygen Concentration ◽  
Conversion Efficiency ◽  
Compression Ratio ◽  
Peak Performance ◽  
Working Fluid ◽  
Fuel Conversion ◽  
Specific Heats ◽  
Spark Timing ◽  
Performance Conditions ◽  
Gas Recirculation

An experimental investigation of methane fuel oxycombustion in a variable compression ratio, spark-ignited piston engine has been carried out. Compression ratio, spark-timing, and oxygen concentration sweeps were performed to determine peak performance conditions for operation with both wet and dry exhaust gas recirculation (EGR). Results illustrate that when operating under oxycombustion conditions an optimum oxygen concentration exists at which fuel-conversion efficiency is maximized. Maximum conversion efficiency was achieved with approximately 29% oxygen by volume in the intake for wet EGR, and approximately 32.5% oxygen by volume in the intake for dry EGR. All test conditions, including air, were able to operate at the engine's maximum compression ratio of 17 to 1 without significant knock limitations. Peak fuel-conversion efficiency under oxycombustion conditions was significantly reduced relative to methane-in-air operation, with wet EGR achieving 23.6%, dry EGR achieving 24.2% and methane-in-air achieving 31.4%. The reduced fuel-conversion efficiency of oxycombustion conditions relative to air was primarily due to the reduced ratio of specific heats of the EGR working fluids relative to nitrogen (air) working fluid.

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