Simulated investigations of low heat rejection concepts applied to low temperature combustion
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© 2017 Eastern States Section of the Combustion Institute. All rights reserved. This study evaluates a technology of integrated low heat rejection (LHR) and low temperature combustion (LTC) aiming to simultaneously achieve improved energy conversion efficiency and lower emissions of internal combustion engines. From most previous studies on LHR diesel engines, thermal-barrier coatings (TBCs) have been recognized as a conventional way of insulating engine parts; to assist with production-level implementation, the LHR concept proposed in this study is realized by altering engine coolant temperature (ECT). A comprehensive analysis of engine performance and fuel consumption was carried out to study the LTC-LHR concept. In previous experiments, the engine is overcooled to low ECTs and then increased to 100°C in an effort to get trend-wise behavior without exceeding safe ECTs. This study uses engine simulation of a conventional multi-cylinder, four-stroke, 1.9L diesel engine operating at 1500 rpm and ∼35% EGR to examine the flow characteristics, engine performance, and combustion phasing at different ECTs under the LTC mode. The results show that increasing ECT yields significant improvements in fuel conversion efficiency, pointing to a higher sensitivity to variations in ECT.
author list (cited authors)
Li, T., Caton, J., & Jacobs, T.