US 2018/0023524 A1 · DUCT STRUCTURE

Abstract

A duct structure including a fin having a downstream end surface extending between an inner surface of a duct and a downstream end of a top surface of the fin in a height direction of the fin. As a result, a vortex can be intentionally generated in a downstream of the downstream end surface of the fin. Since a pressure in the vortex is lower than a pressure in a surrounding portion of the vortex, the vortex can draw a fluid flow having flowed along the top surface of the fin to the vortex and can change the flow to a flow flowing along a portion of the inner surface of the duct located downstream of the fin. As a result, a flow separation from the inner surface of the duct can be suppressed.

Claims18

Dependent claims

A duct structure comprising:

a duct;
and
a fin, wherein
the duct includes an inlet, an outlet and a connecting portion connecting the inlet and the outlet, the duct including an inner surface defining a fluid passage therein,
the fin rises from the inner surface of the duct and ends in the fluid passage in a height direction of the fin, the fin including an upstream end and a downstream end and extending from the upstream end of the fin to the downstream end of the fin in a longitudinal direction of the fin, and
the fin includes a downstream end surface having a form obtained when cutting off a downstream end portion of the fin and generating a vortex in a downstream of the downstream end surface of the fin when a fluid flows in the fluid passage.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

15/647,389Filed 12 Jul 2017

Priority

JP 2016-14212520 Jul 2016

Published

25 Jan 2018

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

F02M 35/10262
Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts: flow guides, obstructions,…
F02M 35/10118
Characterised by details of intake ducts: shapes; connections; arrangements: with variable cross-sections of intake ducts along their length;…
Y02T 10/12
Internal combustion engine [ICE] based vehicles: improving ICE efficiencies
F02M
Supplying combustion engines in general with combustible mixtures or constituents thereof

Duct structure

Life of this patent

Duct structure

Life of this patent

Abstract

Claims18