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A THEORETICAL-STUDY OF A VARIABLE COMPRESSION RATIO TURBOCHARGED DIESEL-ENGINE

RYCHTER, TJ; TEODORCZYK, A; STONE, CR; LEONARD, HJ; LADOMMATOS, N; CHARLTON, SJ; (1992) A THEORETICAL-STUDY OF A VARIABLE COMPRESSION RATIO TURBOCHARGED DIESEL-ENGINE. P I MECH ENG A-J POW , 206 (4) 227 - 238.

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Abstract

A variable compression ratio concept that can give a different expansion ratio to the compression ratio has been evaluated by means of a simulation of a turbocharged diesel engine. The compression ratio is controlled by varying the ratio of the connecting rod length to the crank throw, hence the name variable crank radius/connecting rod length engine (VR/LE). The VR/LE mechanism kinematics have been defined and described, and the compression ratio and expansion ratio have been presented as a function of the eccentric phase angle (alpha(o)). A zero-dimensional engine simulation that has been the subject of comprehensive validation has been used as the basis of the VR/LE study. The effect of the compression ratio on the engine performance at fixed loads is presented. The principal benefits are a reduction in fuel consumption at part load of about 2 per cent and a reduction in ignition delay that leads to an estimated 6 dB reduction in combustion noise. The study has been conducted within the assumption of a maximum cylinder pressure of 160 bar.

Type: Article
Title: A THEORETICAL-STUDY OF A VARIABLE COMPRESSION RATIO TURBOCHARGED DIESEL-ENGINE
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: http://discovery.ucl.ac.uk/id/eprint/106650
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