Apparatus for Reducing Drag of A Transverse Duct Exit Flow

Content Provider	The Lens
Description	Ensemble carénage disposé autour d'un orifice de sortie de conduit, qui n'est pas parallèle à une surface extérieure d'un véhicule, de façon à faire tourner l'écoulement de fluide sortant de l'orifice de sortie de conduit dans une direction d'écoulement de fluide de surface. L'ensemble carénage comprend un carénage d'aube amont pour orienter l'écoulement de surface avec l'écoulement de conduit incliné, un carénage Coanda aval pour faire tourner un écoulement de conduit transversal dans la direction de l'écoulement de surface, et une paire de générateurs de tourbillon dont chacun est positionné au niveau d'un côté latéral opposé du carénage à effet Coanda et inclinés l'un par rapport à l'autre pour organiser l'écoulement de fluide combiné aval de l'orifice de sortie de conduit pour réduire ainsi au minimum la recirculation. Cet ensemble carénage autour de l'orifice de sortie de conduit améliore le mélange organisé des écoulements de conduit et de surface, et réduit ainsi la recirculation de conduit et de surface, la restriction de conduit et la traînée globale du véhicule.
Abstract	A faking assembly is provided about a duct outlet port, which is not parallel to an exterior surface of a vehicle, so as to turn fluid flow exiting the duct outlet port in a direction of surface fluid flow. The fairing assembly includes an upstream vane fairing to orient the surface flow with the angled duct flow, a downstream Coanda fairing to turn transverse duct flow in the direction of the surface flow, and a pair of vortex generators each of which is positioned at an opposing lateral side of the Coanda fairing and angled towards each other and angled towards each other to organize the combined fluid flow downstream of the duct outlet port to thereby minimize recirculation. This fairing assembly about the duct outlet port enhances organized mixing of the duct and surface flows, and thereby reduces duct and surface recirculation, duct restriction, and overall vehicle drag.
Related Links	https://www.lens.org/lens/patent/010-434-498-025-521/frontpage
Language	English
Publisher Date	2019-07-04
Access Restriction	Open
Alternative Title	Appareil De Réduction De Traînée D'un Écoulement De Sortie De Conduit Transversal
Content Type	Text
Resource Type	Patent
Date Applied	2018-12-13
Agent	Hertzberg, Steven M.
Applicant	Aero Design Labs Inc Ahlstrom Eric A Sanders Lee
Application No.	2018065452
Claim	What is claimed is: A duct outlet fairing assembly for reducing drag of a duct outlet port of an angled duct in a vehicle comprising: a vane fairing having a upwardly sloped ramp portion that includes a leading edge mounted forward a leading edge of the duct outlet port, the ramp portion extending rearvvardly and upwardly over a portion of the duct outlet port, the ramp being aligned in a direction of a longitudinal axis of the vehicle; a Coanda fairing having an elongated body with a leading edge circumscribing a trailing edge of the duct outlet port, the elongated body having a predetermined height, width and extending rearwardly a predetermined length based on a dimension of the duct outlet port; and a pair of vortex generators positioned rearwardly of the duct outlet port, each vortex generator being positioned on an opposing lateral side of the Coanda fairing and angled towards each other. The duct outlet fairing assembly of claim 1 , wherein the ramp portion of the vane fairing has a curved upper surface to direct surface air flow along an exterior surface of the aircraft at an upwardly sloped angle away from the duct outlet port. The duct outlet fairing assembly of claim 1 , wherein the ramp portion of the vane fairing has a curved lower surface to direct or turn duct fluid flow exiting the duct outlet port in a direction towards the Coanda fairing. The duct outlet fairing assembly of claim 1 , wherein the ramp portion of the vane fairing has a predetermined length based on the dimension of the duct outlet port. The duct outlet fairing assembly of claim 4, wherein the ramp portion has a length as measured between its leading edge and trailing edge of 0.5 to 0.9 diameters of the duct outlet port. The duct outlet fairing assembly of claim 5, wherein the ramp portion of the vane fairing has a predetermined height as measured from the surface of the aircraft based on one-half of duct angle and the length of the ramp portion. The duct outlet fairing assembly of claim 1 , wherein the ramp further includes a tongue portion that extends downwardly into the angled duct. The duct outlet fairing assembly of claim 6, wherein the tongue portion is configured to and extends a distance that is sufficient to cover a structural obstruction witliin the angled duct. The duct outlet fairing assembly of claim 1, wherein the Coanda failing is substantially triangular in shape. The duct outlet fairing assembly of claim 1 , wherein the Coanda fairing has a height in a range of 0.15 to 0.25 diameters of the duct outlet port per forty-five degrees of duct angle. The duct outlet fairing assembly of claim 1, wherein the Coanda fairing has a height of 0.2 diameters of the duct outlet port per forty-five degrees of duct angle. The duct outlet fairing assembly of claim 1, wherein the Coanda fairing has a length in a range of 1.5 to 3.0 diameters of the duct outlet port per forty-five degrees of duct angle. The duct outlet fairing assembly of claim 1 , wherein the Coanda fairing has a length of 3.0 diameters of the duct outlet port per forty-five degrees of duct angle. The duct outlet fairing assembly of claim 1 , wherein each of the pair of vortex generators extends substantially perpendicular from an exterior surface of the vehicle. The duct outlet fairing assembly of claim 1. wherein the pair of vortex generators are positioned aft of the duct within two duct diameters. The duct outlet fairing assembly of claim 1 , wherein each of the pair of vortex generators are angled between fifteen and thirty degrees to a centerline of the duct outlet port to thereby generate counter rotating vortices which converge behind the Coanda fairing. The duct outlet fairing assembly of claim 1 , wherein each of the pair of vortex generators includes a base which is mounted to an exterior surface of the vehicle and a dorsal member which extends outwardly and substantially perpendicular from the base. The duct outlet fairing assembly of claim 17, wherein the dorsal member of the pair of vortex has a curved leading edge.
CPC Classification	AEROPLANES;HELICOPTERS Climate Change Mitigation Technologies Related To Transportation
Extended Family	139-640-587-383-238 089-395-525-003-481 161-612-037-150-156 179-412-232-511-997 010-434-498-025-521 176-925-167-333-411 154-902-694-975-643 188-043-179-570-351 199-577-598-510-973
Patent ID	2019133276
Inventor/Author	Ahlstrom Eric A Sanders Lee
IPC	B64C23/06 B64C7/00 B64C21/02
Status	Pending
Simple Family	139-640-587-383-238 089-395-525-003-481 010-434-498-025-521 179-412-232-511-997 161-612-037-150-156 176-925-167-333-411 154-902-694-975-643 188-043-179-570-351 199-577-598-510-973
CPC (with Group)	B64C23/06 B64C7/00 B64C21/02 Y02T50/10
Issuing Authority	United States Patent and Trademark Office (USPTO)
Kind	Patent Application Publication