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RESEARCH PAPERS: Internal Combustion Engines

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

[+] Author and Article Information
K. Rama Mohan

VNR Vignana Jyothi Institute of Engineering and Technology, Batchpally, Hyderabad, Andhra Pradesh, India

C. M. Vara Parasad

Sri Venkateswara Engineering College, Suryapet, Nalgonda (Dt.), Andhra Pradesh, India

M. V. S. Murali Krishna

Mechanical Engineering Department, Chaitanya Bharati Institute of Technology, Gandipet, Hyderabad, Andhra Pradesh, India

J. Eng. Gas Turbines Power 121(3), 530-539 (Jul 01, 1999) (10 pages) doi:10.1115/1.2818505 History: Received February 10, 1997; Revised March 03, 1999; Online December 03, 2007

Abstract

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.

Copyright © 1999 by The American Society of Mechanical Engineers
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