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Effect of Inlet Valve Angle on In-Cylinder Swirl. Generation Characteristics(II)  

Ohm, In-Yong (Department of Mechanical Engineering, Seoul National University of Technology)
Park, Chan-Jun (Department of Mechanical Engineering, Seoul National University of Technology)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.17, no.2, 2009 , pp. 42-48 More about this Journal
Abstract
This paper is the second of 2 companion papers which investigate in-cylinder swirl generation characteristics according to inlet valve angle. Two DOHC 4 valve engines, one has wide intake valve angle and the other has narrow valve angle, were used to compare the characteristics of swirl motion generation in the cylinder. One intake port was deactivated to induce swirl flow. A PIV (Particle Image Velocimetry) was applied to measure in-cylinder velocity field according to inlet valve angle during intake stroke. The results show that the flow patterns of narrow valve engine are much more stable and well arranged compared with the normal engine over the entire intake and compression stroke except early intake stage, and very strong swirl motion is generated at the end of compression stage in this engine nevertheless using straight port which is unfavorable for swirl generating. In the wide valve angle one, however, strong swirl motion induced during intake stroke is destroyed as the compression progresses.
Keywords
PIV(Particle Image Velocimetry); Valve angle; In-cylinder flow; Swirl;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
연도 인용수 순위
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