Study on Air Flow Characteristics in Cylinders of a Four-Valve Engine with Different Lifts of Valves
Shiqiang Zhang*, 1, Xianghong Zhang1, Huigang Wang1, Ruilin Liu2, Wuquan Liu2, Guangmeng Zhou2, Miao Chi2
Identifiers and Pagination:Year: 2014
First Page: 185
Last Page: 189
Publisher Id: TOMEJ-8-185
Article History:Received Date: 30/04/2014
Revision Received Date: 04/06/2014
Acceptance Date: 06/06/2014
Electronic publication date: 13/6/2014
Collection year: 2014
open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: (https://creativecommons.org/licenses/by/4.0/legalcode). This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
A 1arge-scale tumble rather than swirl would exist in cylinders in the case of two valves’ opening in a fourvalve engine. A strong swirl is generated when one valve is closed, yet the flow capacity is less than that of two valves being opened. In order to change it, different lifts of valves (DLV) present are achieved. In the case of using different lifts of two intake valves, both tumble and swirl would occur in cylinders, and the flow capacity will hardly change. A new method of measuring the rotational speed of the intake swirl –the method of virtual rotational speed of theory has been put forward. Not only does it eliminate the influence of frictional resistance, but also obtain a theoretic rotational speed, which is only produced by intake swirl.