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Effect of combustion chamber shape on tumble flow, squish-generated flow and burn rate

✍ Scribed by Masahiko Fujimoto; Kohei Iwai; Motoshi Kataoka; Michihiko Tabata

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
708 KB
Volume
23
Category
Article
ISSN
0389-4304

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✦ Synopsis

Effects of squish area location on tumble and squish flow were investigated to control the knock in an SI engine. For the exhaust squish piston, tumble flow is collapsed by the exhaust squish clearance during the compression stroke, so that the compressionsquish flow is strong. For the intake squish piston, tumble flow impinges on the edge of squish area and the induction of it into the squish area is controlled. The compression-squish flow is weakened and reverse-squish flow grows strong. This led to realization of a high heat release at late stage combustion. Simultaneously, the decrease of cycle-by-cycle variation of initial burn is realized. Consequently, knocking is controlled compared with a flat piston.

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