Characterization method of engine air behaviour from a real head-cylinder

TIMOTHEE, ZUSSY and SAID, ABBOUDI and BRUNO, COURTALON and SAMUEL, GOMES (2017) Characterization method of engine air behaviour from a real head-cylinder. In: Seventh International Conference On Advances in Mechanical, Aeronautical and Production Techniques - MAPT 2017, 01-02 July, 2017, Kuala Lumpur, Malaysia.

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Abstract

This study is based on a head-cylinder provided by a French car manufacturer, which comes from a 4-cylinder 4-stroke spark-ignition engine. This head-cylinder adopts a Double-Over-Head-Camshaft (DOHC) with 16 valves, also two per cylinder. The purpose of this paper is to propose a characterization method of the air behaviour inside both the intake conduct of a head-cylinder and the cylinder. The cylinder stroke is known (from the cylinder capacity of the engine) as well as the valve dimensions (by measurements) but none internal dimensions of the conduct. The proposal method follows three main steps: firstly, internal features are extracted separately by moulding with a silicon-calcium mixture, to realize the geometrical limits of the air. This step concerns only the conduct and the combustion chamber of the head-cylinder. Secondly, the two features and one of the two valves are digitized with a Faro® laser arm to compose cloud points of their shapes. Surfaces can be then reconstituted to construct a CAD model, with liftparameterized valves. Thirdly, the CAD model is exported to the CFD software Fluent® to be meshed and used to simulate air behaviour based on turbulence Reynold Stress Model (RSM) and Realizable к-ε models. This last step is realized under steady-state condition, with both 2450 Pa and 9000 Pa of pressure drops between cylinder outlet and intake inlet, to obtain a view of the air motions variations in the conduct and the cylinder following the valves lift. Variations in mass flow rate results are also observed and compared with the literature for 2450 Pa of pressure drop, and allows to choose the best turbulence model. Those concerning 9000 Pa of pressure drop have been already validated with a flow bench test, in a previous study.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Head cylinder, spark-ignition, shapes extraction, numerical, 3D, turbulence, RSM, к-ε.
Depositing User: Mr. John Steve
Date Deposited: 11 Mar 2019 11:30
Last Modified: 11 Mar 2019 11:30
URI: http://publications.theired.org/id/eprint/420

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