Performance evaluation of waste fried vegetable oil in a medium grade low heat rejection diesel engine

Murali Krishna, M. V. S.; Chowdary, R. P.; Kishen Kumar Reddy, T.; Murthy, P. V. K.

doi:10.22061/jcarme.2015.269

Document Type : Research Paper

Authors

¹ bMechanical Engineering Department, Chaitanya Bharathi Institute of Technology, Gandipet, Hyderabad-500 075, Telengana State, India

² Mechanical Engineering Department, College of Engineering, J.N.T. University, Hyderabad -500 085, Telengana State, India

³ Jayapraksh Narayan Group of Institutions , Mahabubnagar-509001, Telengana State, India

https://doi.org/10.22061/jcarme.2015.269

Abstract

Investigations were carried out to evaluate the performance of direct injection diesel engine with medium grade low heat rejection (LHR) combustion chamber and 3 mm air gap insulated piston, 3 mm air gap insulated liner, and ceramic coated cylinder head [ceramic coating with the thickness of 500 µ was made on the inside portion of the cylinder head].The engine had different operating conditions [normal temperature and pre–heated temperature] of crude waste fried vegetable oil (WFVO) which was collected from restaurants, hotels, etc. with varied injector opening pressure and injection timing. Performance parameters and exhaust emissions were evaluated at various values of brake mean effective pressure of the engine, while combustion parameters were determined at full load operation of the engine using special pressure–crank angle software package. Comparative studies were performed between vegetable oil operation and diesel operation in the engine with both versions of the combustion chamber with varied injection timing and injector opening pressure. Conventional engine (CE) showed deteriorated performance, while the engine with medium grade LHR combustion chamber had improved performance with waste fried vegetable oil operation at the recommended injection timing and pressure. Performance of both versions of the combustion chamber improved with advanced injection timing and at higher injector opening pressure compared with CE with pure diesel operation. The optimum injection timing was 32^obTDC (before top dead centre) with conventional engine, while it was 30^obTDC for the engine with LHR combustion chamber and vegetable oil operation. Compared with pure diesel operation in the conventional engine, at manufacturer's recommended injection timing of 27^obTDC, peak brake thermal efficiency increased by 9% at full load operation, brake specific energy consumption decreased by 2%, volumetric efficiency decreased by 13%, smoke levels decreased by 10%, and nitrogen oxide (NO_x) levels increased by 44% with waste fried vegetable oil operation in the engine with LHR combustion chamber.

Keywords

20.1001.1.22287922.2015.4.2.1.0

Main Subjects

Thermodynamics and Cumbustion

References

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Journal of Computational & Applied Research in Mechanical Engineering (JCARME)

Performance evaluation of waste fried vegetable oil in a medium grade low heat rejection diesel engine

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Volume 4, Issue 2 - Serial Number 2
June 2015
Pages 101-102

Performance evaluation of waste fried vegetable oil in a medium grade low heat rejection diesel engine

References

References

Send comment about this article

Volume 4, Issue 2 - Serial Number 2June 2015Pages 101-102

Volume 4, Issue 2 - Serial Number 2
June 2015
Pages 101-102