Performance Evaluation of a Low-Grade Low-Heat-Rejection Diesel
Engine with Crude <i>Pongamia oil</i>

Reddy, Ch. Kesava; Krishna, M. V. S. Murali; Murthy, P. V. K.; Reddy, T. Ratna

doi:10.5402/2012/489605

Cited by 11 publications

(10 citation statements)

References 14 publications

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“…editor@iaeme.com Experiments were conducted on medium grade LHR engine which consisted of air gap insulated piston with superni crown and air gap insulated liner with superni insert with advanced injection timings and increased injection pressure with vegetable oils. [26][27][28]. They reported that particulate matter decreased by 20% and NOx levels increased by 45% at peak load operation with LHR engine.…”

Section: Introductionmentioning

confidence: 99%

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Investigations on Low Heat Rejection Diesel Engine With Carbureted Alcohols and Crude Cotton Seed Oil

Nagini¹,

Krishna²

2021

International Journal of Mechanical Engineering and Technology (Ijmet)

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Alcohols and vegetable oils are promising fuels for replacing conventional diesel fuel. The advantages of alcohol (more volatility, low carbon to hydrogen ratio) and vegetable oils (comparable calorific value and cetane number) are attracting features to use them as substituted fuels in diesel engines. However demerits of alcohol (low calorific value and low cetane number (measure of combustion quality in diesel engines)) and vegetable oils (high viscosity and low volatility) call for low heat rejection (LHR) engine which has high heat release rate and faster rate of combustion. Heat flow to the coolant is minimized by providing thermal insulation in the path of heat flow to the coolant. Investigations were carried out to study the exhaust emissions from high 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, air gap insulated liner with superni insert and ceramic coated cylinder head with normal temperature condition of crude cottonseed oil and carbureted alcohol (methanol/butanol) with varied injection pressure and compared with methanol operation over butanol operation and also with net diesel operation on conventional engine (CE). Exhaust emissions of particulate matter and oxides of nitrogen (NOx) were recorded by AVL Smoke meter and Netel Chromatograph NOx analyzer respectively at full load operation of the engine. Aldehydes were measured by dinitrophenyl hydrazine (DNPH) method at full load operation of the engine. Particulate levels and NOx levels decreased by 92% and 12% respectively with LHR engine at recommended injection timing of 27 o bTDC (before top dead centre) and at an injection pressure of 190 bar with methanol operation in comparison with neat diesel operation on CE.

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Section: Introductionmentioning

confidence: 99%

“…Experiments were carried out with high grade LHR engine, which consisted of air gap insulated piston, air gap insulated liner and ceramic coated cylinder head with vegetable oils [29][30][31]. They reported that LHR engine further increased NOx levels and decreased smoke levels.…”

Section: Introductionmentioning

confidence: 99%

Investigations on Low Heat Rejection Diesel Engine With Carbureted Alcohols and Crude Cotton Seed Oil

Nagini¹,

Krishna²

2021

International Journal of Mechanical Engineering and Technology (Ijmet)

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“…Experiments were extended to crude vegetable oil operation on high grade LHR engine. [24][25][26]. The optimum injection timing was observed to be 29 o bTDC with high grade LHR combustion chamber with crude vegetable oil operation.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Exhaust Emissions of Semi Adiabatic Diesel Engine With Alternative Fuels

Janardhan¹,

Krishna²

2021

International Journal of Mechanical Engineering and Technology (Ijmet)

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Drawbacks associated with crude vegetable oils (high viscosity and low volatility)and alcohol (low energy content and cetane number) for use in compression ignition engine call for biodiesels. These biodiesels have numerous advantages compared to fossil fuels as they are renewable, biodegradable, provide energy security and foreign exchange savings besides addressing environmental concerns and socio-economic issues. However, these alternative fuels (vegetable oils and its biodiesels) are highly to moderate viscous and require hot combustion chamber, provided by semi adiabatic diesel engine. Investigations were carried out to determine exhaust emissions of a high grade semi adiabatic diesel engine consisted of air gap insulated piston, air gap insulated liner and ceramic coated cylinder head with different operating conditions [normal temperature and pre-heated temperature] of crude rice bran oil and its biodiesel with varied injector opening pressure. Exhaust emissions were determined at various values of brake mean effective pressure of the engine fuelled with crude rice bran oil and its biodiesel. Comparative studies on exhaust emissions were made with diesel working on similar conditions. Particulate emissions decreased, while NOx levels increased with LHR engine with biodiesel operation. Exhaust emissions improved with increase of injector opening pressure and preheating of biodiesel.

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“…The heat resistant coating reduces the heat transfer to the coolant system and improves the thermal efficiency by increasing the energy availability in the exhaust [1][2][3][4][5][6][7]. The diesel engine with its combustion chamber walls are insulated by heat flow resistant coating is referred to as LHR engine.…”

Section: Introductionmentioning

confidence: 99%

Analysis of combustion performance and emission of extended expansion cycle and iEGR for low heat rejection turbocharged direct injection diesel engines

Shabir¹,

Prasath²,

Tamilporai

2014

THERM SCI

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Increasing thermal efficiency in diesel engines through low heat rejection concept is a feasible technique. In low heat rejection engines the high heat evolution is achieved by insulating the combustion chamber surfaces and coolant side of the cylinder with partially stabilized zirconia of 0.5 mm thickness and the effective utilization of this heat depend on the engine design and operating conditions. To make the low heat rejection engines more suitable for automobile and stationary applications, the extended expansion was introduced by modifying the inlet cam for late closing of intake valve through Miller's cycle for extended expansion. Through the extended expansion concept the actual work done increases, exhaust blow-down loss reduced and the thermal efficiency of the low heat rejection engine is improved. In low heat rejection engines, the formation of nitric oxide is more, to reduce the nitric oxide emission, the internal exhaust gas re-circulation is incorporated using modified exhaust cam with secondary lobe. Modifications of gas exchange with internal exhaust gas re-circulation resulted in decrease in nitric oxide emissions. In this work, the parametric studies were carried out both theoretically and experimentally. The combustion, performance and emission parameters were studied and were found to be satisfactory.

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Performance Evaluation of a Low-Grade Low-Heat-Rejection Diesel Engine with Crude Pongamia oil

Cited by 11 publications

References 14 publications

Investigations on Low Heat Rejection Diesel Engine With Carbureted Alcohols and Crude Cotton Seed Oil

Investigations on Low Heat Rejection Diesel Engine With Carbureted Alcohols and Crude Cotton Seed Oil

Reduction of Exhaust Emissions of Semi Adiabatic Diesel Engine With Alternative Fuels

Analysis of combustion performance and emission of extended expansion cycle and iEGR for low heat rejection turbocharged direct injection diesel engines

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