The Proceedings of Conference of Kyushu Branch
Online ISSN : 2424-2780
2019.72
Session ID : B12
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Control of HCCI combustion by EGR and pulsed flame jet using rapid compression expansion machine
*Shunichiro HAYASHIYuya ITOKazuya SHIMIZUOsamu MORIUE
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Abstract

Homogeneous Charge Compression Ignition (HCCI) combustion has advantages of high thermal efficiency and low pollutive emissions, while it has a disadvantage in controlling ignition timing. In order to solve this problem, Pulsed Flame Jet (PFJ) and Exhaust Gas Recirculation (EGR) were employed in Rapid Compression Expansion Machine (RCEM). PFJ is the jet of burning gas issuing from a small cavity facing a combustion chamber. It is expected to advance autoignition timing. In addition, EGR leads to the retard of autoignition timing. Therefore, the optimization of ignition timing by PFJ were attempted under EGR conditions. RCEM realizes single compression and expansion strokes and thus the measurement of indicated work. EGR rate was varied between 0 % and 40 %, while the amount of fuel was fixed. Without PFJ, higher EGR rate led to the retard of autoignition timing and thus to lower knock intensity. With PFJ, indicated work under EGR conditions was improved by optimizing the timing of spark discharge of PFJ.

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© 2019 The Japan Society of Mechanical Engineers
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