Intake arrangement for combustion chamber

Abstract

An intake arrangement for a combustion chamber 40 comprises a first intake duct or branch 42 producing a substantially rotational flow 52 in the chamber and a second intake duct or branch 44 producing a flow divided into two components, the first component 54 being an axial flow into the chamber 40 and the second component being a rotational flow 55 having the same sense of rotation as that from the first duct 42. The first and second duct components 54, 55 arise from the shaping of a junction region 74 between branches 72, 76 of the second intake duct 44 adjacent the chamber 40.

Description

technical field [0001] The present invention relates to an air intake device for a combustion chamber, and in particular to an air intake configuration for a combustion chamber of a direct-injection diesel engine. Background technique [0002] An important aspect when designing a combustion chamber or cylinder, and the ports associated with it, is the creation of an effective region of intra-chamber motion in the form of axial swirls known as "vortices". Efficient designs create a high degree of swirl to allow rapid distribution of air or air / fuel mixture within the combustion chamber which will produce efficient combustion. [0003] Another design criterion is the discharge coefficient, which is a measure of the mass flow from the port, or the permeability of the combustion chamber, which represents how efficiently the intake port fills the combustion chamber with air or an air / fuel mixture. This is also known as engine air intake. [0004] In known four-cylinder engines,...

AI Technical Summary

Problems solved by technology

However, the use of swirl sheets will inevitably cause a decline in volumetric efficiency

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