Experimental Studies on Diesel Engine with Piston Crown Modification Using an Optimum Alternative Fuel

2015 ◽  
Vol 813-814 ◽  
pp. 830-835
Author(s):  
Akkaraju H. Kiran Theja ◽  
Rayapati Subbarao
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Experimental Studies ◽  
Alternative Fuel ◽  
Air Gap ◽  
The Body ◽  
Injection Timing ◽  
Positive Trend ◽  
Piston Crown ◽  
Karanja Oil

The drawbacks associated with bio-fuels can be minimized by making modifications to combustion chamber. Modification of combustion chamber is achieved by providing an air gap in between the crown and the body of the piston with the top crown made of low thermal conductivity material. Experimentation is carried on a diesel engine with brass as piston crown material and karanja as test fuel, which is found to be a better alternative fuel based on the tests carried out prior to modification. Investigations are carried out on the performance of the engine with modified combustion chamber consisting of air gap insulated piston with 2 mm air gap with brass crown when fuelled with karanja oil. Comparative studies are made between the two configurations of engine with and without modification at an injection timing of 29obTDC. Performance, heat balance and emission plots are made with respect to brake power. Fuel consumption increased with modification. The mechanical and volumetric efficiencies are similar in both the cases. Indicated and brake thermal efficiencies got reduced with modification. But, it is good to see that HC and CO emissions are showing positive trend. Thus, the present investigation hints the possibility of improvements while making piston modification and providing air gap insulation.

Experimental Investigations on DI Diesel Engine With Low Heat Rejection Combustion Chamber With Waste Fried Vegetable Oil and its Biodiesel

2015 ◽  
Author(s):  
Raavi Peraiah Chowdary ◽  
Maddali V. S. Murali Krishna ◽  
T. Kishen Kumar Reddy ◽  
D. Srikanth ◽  
P. V. Krishna Murthy ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Vegetable Oil ◽  
Alternative Fuels ◽  
Air Gap ◽  
Operating Conditions ◽  
Injection Timing ◽  
Heat Rejection ◽  
Improved Performance ◽  
Ci Engines

Biodiesels derived from vegetable oils present a very promising alternative fuels for diesel fuel, since they have numerous advantages compared to fossil fuels. However crude vegetable oil and biodiesel have high viscosity and low volatility causing combustion problems in CI engines, call for engine with hot combustion chamber. Investigations were carried out on single–cylinder, four–stroke, water cooled, 3.68 kW direct injection diesel engine at a speed of 1500 rpm to evaluate the performance of a engine with low heat rejection (LHR) combustion chamber. It consisted of an air gap (3 mm) insulated piston with superni (an alloy of nickel) crown and an air gap (3 mm) insulated liner with superni insert and ceramic coated cylinder head fuelled with different operating conditions (normal temperature and preheated temperature) of waste fried vegetable oil and its biodiesel with varied injection timing and injector opening pressure. Engine with LHR combustion chamber with biodiesel showed improved performance over conventional engine (CE) at 27° bTDC and at optimum injection timing. Biodiesel showed improved performance over crude vegetable oil with engine with both versions of the combustion chamber. Preheated test fuels and increase of injection pressure showed reduction of pollution levels and marginally improved performance over normal test fuels.

Experimental Investigations on DI Diesel Engine With Low Heat Rejection Combustion Chamber With Carbureted Ethanol and Crude Jatropha Oil

2015 ◽  
Author(s):  
Vencherla V. R. Seshagiri Rao ◽  
Maddali V. S. Murali Krishna ◽  
T. Kishen Kumar Reddy ◽  
D. Srikanth ◽  
P. V. Krishna Murthy
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Vegetable Oil ◽  
Air Gap ◽  
Injection Timing ◽  
Jatropha Oil ◽  
Heat Rejection ◽  
Full Load ◽  
Full Load Operation ◽  
Ci Engines

It has been found that the vegetable oils and alcohols (ethanol and methanol) are promising substitute fuels for diesel fuel, because they are renewable in nature. However drawbacks associated with crude vegetable oil (high viscosity and low volatility) and ethanol (low cetane number and low energy content) which cause combustion problems in CI engines, call for engine with hot combustion chamber. Investigations were carried out on single–cylinder, four–stroke, water cooled, 3.68 kW direct injection diesel engine at a speed of 1500 rpm to evaluate the performance of a engine with medium grade low heat rejection (LHR) combustion chamber. It consisted of an air gap insulated piston and an air gap insulated liner fuelled with crude jatropha oil and carbureted ethanol with varied injection timing and injector opening pressure. Carbureted ethanol was inducted into the engine through a variable jet carburetor. This carburetor was installed at the inlet manifold of the engine and ethanol was inducted at different percentages of crude vegetable oil at full load operation on mass basis. Aldehydes (measured by dinitrophenyl hydrazine method), particulate emissions and oxides of nitrogen were measured at full load operation of the engine. With maximum induction of ethanol, engine with LHR combustion chamber showed improved performance over conventional engine at 27°bTDC and optimized injection timing.

Performance of a Low Heat Rejection Diesel Engine With Air Gap Insulated Piston

1999 ◽  
Vol 121 (3) ◽  
pp. 530-539 ◽  
Author(s):  
K. Rama Mohan ◽  
C. M. Vara Parasad ◽  
M. V. S. Murali Krishna
Keyword(s):  
Finite Element ◽  
Diesel Engine ◽  
Finite Element Modeling ◽  
Air Gap ◽  
Combustion Model ◽  
Injection Timing ◽  
Exhaust Gas ◽  
Full Load ◽  
Piston Crown ◽  
Finite Element Prediction

A threaded air gap insulated piston provided effective insulation without causing sealing problems. The performance of the diesel engine with the air gap insulated piston was obtained with different piston crown materials, at differing magnitudes of air gap with varying injection timings. The engine using Nimonic for the piston crown with an air gap of 3 mm at an injection timing of 29.5° bTDC reduced the BSFC by 12 percent at part loads and 4 percent at full load. The performance in terms of P-θ and T-θ was predicted employing a zero dimensional multizone combustion model, and the model results have been validated with measured pressures and the exhaust gas temperatures. More appropriate piston surface temperatures were employed in Annand’s equation to improve the computer predictions using finite element modeling of the piston. The measured temperatures of air in the air gap using an L-link mechanism provided excellent validation for the finite element prediction of isotherms in the piston.

Investigations on performance of diesel engine by varying injection timings with design modification on piston crown

2018 ◽  
Vol 15 (5) ◽  
pp. 562-566
Author(s):  
Vijaya K. ◽  
Shailesh Palaparty ◽  
Raghavan Srinivasa ◽  
Ravi Kumar Puli
Keyword(s):  
Diesel Engine ◽  
Injection Pressure ◽  
Combustible Mixture ◽  
Injection Timing ◽  
Connecting Rod ◽  
Design Modification ◽  
Content Type ◽  
Piston Head ◽  
Piston Crown ◽  
Fuel Vaporization

Purpose Investigations are carried out with the aim of improving performance of a diesel engine with the design modification on piston crown to stimulate the uniform combustion by inducing turbulence in the incoming charge. Design/methodology/approach A stirrer is introduced at the top of the piston so as to inculcate more turbulence to the incoming charge by improving the rate of fuel vaporization. Whirling motion is created in the combustible mixture by providing rotating blades on the cavity/bowl of the reciprocating piston head. By putting a simple link mechanism, the oscillatory motion of connecting rod will rotate the blade by an angle of 60°. Findings The investigations are carried out with and without swirl piston at 17.5 compression ratio and 200 bar injection pressure by varying injection timings. Originality/value Finally, the result shows that by using the modified piston, nearly 3 per cent of efficiency increased and 31 per cent of NOx emissions are reduced compared to that of a normal piston with 80 per cent load at standard injection timing.

Experimental and Theoretical Optimization of Combustion Chamber and Fuel Distribution for the Low Emission Direct-Injection Diesel Engine

2002 ◽  
Vol 125 (1) ◽  
pp. 351-357 ◽  
Author(s):  
Y. Kidoguchi ◽  
M. Sanda ◽  
K. Miwa
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Direct Injection ◽  
Combustion Process ◽  
Mixture Distribution ◽  
Initial Mixture ◽  
Injection Timing ◽  
Particulate Emissions ◽  
Particulate Emission ◽  
Direct Injection Diesel Engine

Effects of combustion chamber geometry and initial mixture distribution on the combustion process were investigated in a direct-injection diesel engine. In the engine experiment, a high squish combustion chamber with a squish lip could reduce both NOx and particulate emissions with retarded injection timing. According to the results of CFD computation and phenomenological modeling, the high squish combustion chamber with a central pip is effective to keep the combusting mixture under the squish lip until the end of combustion and the combustion region forms rich and highly turbulent atmosphere. This kind of mixture distribution tends to reduce initial burning, resulting in restraint of NOx emission while keeping low particulate emission.

Performance Evaluation of a Low Heat Rejection Diesel Engine with Jatropha Oil

2013 ◽  
Vol 11 ◽  
pp. 27-44 ◽  
Author(s):  
N. Janardhan ◽  
M.V.S. Murali Krishna ◽  
P. Ushasri ◽  
P.V.K. Murthy
Keyword(s):  
Diesel Engine ◽  
Thermal Efficiency ◽  
Peak Pressure ◽  
Air Gap ◽  
Injection Timing ◽  
Jatropha Oil ◽  
Opening Pressure ◽  
Brake Thermal Efficiency ◽  
Heat Rejection ◽  
Diesel Operation

Investigations were carried out to evaluate the performance of a low heat rejection (LHR) diesel engine consisting of air gap insulated piston with 3-mm air gap, with superni (an alloy of nickel) crown, air gap insulated liner with superni insert and ceramic coated cylinder head with different operating conditions of crude jatropha oil (CJO) with varied injection timing and injector opening pressure . Performance parameters [brake thermal efficiency, exhaust gas temperature, coolant load and volumetric efficienc and exhaust emissions [smoke and oxides of nitroge were determined at various values of brake mean effective pressure (BMEP). Combustion characteristics [ peak pressure, time of occurrence of peak pressure and maximum rate of pressure ris of the engine were at peak load operation of the engine. Conventional engine (CE) showed deteriorated performance, while LHR engine showed improved performance with vegetable operation at recommended injection timing and pressure. The performance of both versions of the engine improved with advanced injection timing and higher injector opening pressure when compared with CE with pure diesel operation. Relatively, peak brake thermal efficiency increased by 14%, smoke levels decreased by 27% and NOx levels increased by 49% with vegetable oil operation on LHR engine at its optimum injection timing, when compared with pure diesel operation on CE at manufacturers recommended injection timing.

Potential of a Medium Grade Low Heat Rejection Diesel Engine With Crude Tobacco Seed Oil

2013 ◽  
Author(s):  
M. V. S. Murali Krishna ◽  
P. Pavan Kumar ◽  
P. V. K. Murthy ◽  
D. Baswaraju
Keyword(s):  
Diesel Engine ◽  
Maximum Rate ◽  
Seed Oil ◽  
Peak Pressure ◽  
Injection Pressure ◽  
Air Gap ◽  
Injection Timing ◽  
Brake Thermal Efficiency ◽  
Tobacco Seed ◽  
Diesel Operation

Investigations were carried out to evaluate the performance of a medium grade low heat rejection (LHR) diesel engine consisting of air gap insulated piston with 3-mm air gap, with superni (an alloy of nickel) crown and air gap insulated liner with superni insert with different operating conditions of crude tobacco seed oil with varied injection timing and injection pressure. Performance parameters of brake thermal efficiency (BTE), exhaust gas temperature (EGT), volumetric efficiency (VE), coolant load (CL) and sound intensity were determined at various values of brake mean effective pressure (BMEP) of the engine. Exhaust emissions of smoke and oxides of nitrogen (NOx) were noted at different values of BMEP of the engine. Combustion characteristics of peak pressure (PP), time of occurrence of peak pressure (TOPP), maximum rate of pressure rise (MRPR) and time of occurrence of maximum rate of pressure (TOMRPR) were measured with TDC (top dead centre) encoder, pressure transducer, console and special pressure-crank angle software-package at the peak load operation of the engine. Conventional engine (CE) showed deteriorated performance, while LHR engine showed improved performance with crude tobacco seed oil (CTSO) operation when compared with pure diesel operation at recommended injection timing and pressure. The optimum injection timing was found to be 32°bTDC (before top dead centre) with CE while it was 30°bTDC with LHR engine with vegetable oil operation. The performance of both version of the engine improved with advanced injection timing and higher injection pressure with test fuels. Peak brake thermal efficiency increased by 4%, volumetric efficiency decreased by 8%, smoke levels decreased by 4% and NOx levels increased by 37% with vegetable oil operation on LHR engine at its optimum injection timing, when compared with pure diesel operation on CE at manufacturer’s recommended injection timing of 27°bTDC.

scholarly journals A COMPREHENSIVE REVIEW ON KARANJA OIL AS AN ALTERNATIVE FUEL FOR DIESEL ENGINE

2021 ◽  
Vol 23 (05) ◽  
pp. 663-669
Author(s):  
D.D. Palande ◽  
◽  
N.C. Ghuge
Keyword(s):  
Diesel Engine ◽  
Alternative Fuel ◽  
Edible Oil ◽  
Promising Alternative ◽  
Brake Thermal Efficiency ◽  
Comprehensive Review ◽  
Diesel Fuels ◽  
Oil Reserves ◽  
Karanja Oil ◽  
Petroleum Fuels

The strict emission laws, deteriorating environmental conditions, the depletion of oil reserves and the increasing price of petroleum fuels have forced the world to find alternatives fuels. Biodiesel, the promising alternative fuel can be used in diesel engines with little or no modifications. The properties of biodiesel are similar to those of diesel fuels. It can use as a fuel in diesel engine by blending with diesel The use of non-edible oil is more beneficial as compared with edible oil. Various non-edible oil seeds like Jatropha, Karanja, Neem etc. are widely available in India. Among them, Karanja has a potential to be used for the production of biodiesel. Karanja, are multipurpose non-edible plants can be cultivated on any type of soil such as degraded forests, boundaries of roads and irrigation canals. Its seeds contain 27–39% of the oil. This paper provides a comprehensive review on the important contributions of researcher work on Karanja oil and its blend as alternative fuel for diesel engine .The performance parameters evaluated include brake specific fuel consumption, brake thermal efficiency and emission parameters of karanja bio diesel and its blends are described. It is observed that Karanja oil can be used as alternative fuel for diesel engine.

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