WO2009041934A1 - Dispositif de suppression de tourbillon pour bord de mur - Google Patents

Dispositif de suppression de tourbillon pour bord de mur Download PDF

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Publication number
WO2009041934A1
WO2009041934A1 PCT/US2007/020556 US2007020556W WO2009041934A1 WO 2009041934 A1 WO2009041934 A1 WO 2009041934A1 US 2007020556 W US2007020556 W US 2007020556W WO 2009041934 A1 WO2009041934 A1 WO 2009041934A1
Authority
WO
WIPO (PCT)
Prior art keywords
wall
vortex
wall edge
edge
building
Prior art date
Application number
PCT/US2007/020556
Other languages
English (en)
Inventor
Jason J. Lin
Original Assignee
Renscience Ip Holdings Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renscience Ip Holdings Inc. filed Critical Renscience Ip Holdings Inc.
Priority to PCT/US2007/020556 priority Critical patent/WO2009041934A1/fr
Publication of WO2009041934A1 publication Critical patent/WO2009041934A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage; Sky-lights
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage; Sky-lights
    • E04D13/15—Trimming strips; Edge strips; Fascias; Expansion joints for roofs

Definitions

  • This invention relates to an aerodynamic means that mitigate wind generated vortices and wind loads in the wall edge areas of a building, in a simple, effective, and economical way, applicable for both new constructions and retrofits of existing buildings.
  • This invention discloses an aerodynamic means that mitigate strong vortices and high loads induced by wind on the wall edge area of a building, in a simple, effective, and economical way, applicable and convenient for both new constructions and retrofits of existing buildings.
  • This is achieved by using elongated devices of appropriate configurations mounted along a wall edge, therefore to intervene with the wind flow and suppress edge vortex. Examples of such configurations include wall edge cap, windscreen and wind spoiler.
  • These devices primarily comprise of elongated members mounted to a wall edge and defining a new exterior configuration of a building comer, and appropriate means to attach and secure the elongated member to a building corner.
  • wall edge refers to an edge at which two terminating wall surfaces intersect at an approximately right angle and form a convex corner of a building.
  • Vortex formation and extreme wind load are inherent around a building corner, where abrupt change in wall surface orientation occurs along the flow path such that the accelerated wind flow around a corner severely separates from the downstream wall surface.
  • a wall edge vortex suppressor intervenes and modifies the wind flow around the corner of a building. It mitigates flow separation, prevents vortex formation or suppresses its strength, and ultimately reduces the wind force exerted on the wall area adjacent to the edge where most initial wind damages to a wall system occur.
  • Figure 1 schematically shows a cross-sectional view for one of the preferred embodiments of wall edge cap, being mounted to both sides of a wall edge.
  • Figure 2 illustrates an alternative configuration of wall edge caps, being mounted to each side of a wall edge separately.
  • Figure 3 schematically shows a cross-sectional view for one of the preferred embodiments of wall edge windscreen.
  • Figure 3A is view 3A from Figure 3, exemplifying face perforation and edge serration of a windscreen.
  • Figure 4 exemplifies alternative configuration of wall edge windscreens.
  • Figure 5 schematically shows a cross-sectional view for one of the preferred embodiments of wall edge wind spoiler.
  • Figure 5A is view 5A from Figure 5, exemplifying a longitudinally continuous support with face perforation for a wind spoiler.
  • Figure 6 illustrates an alternative configuration of wall edge wind spoilers.
  • Figure 1 illustrates a preferred configuration of wall edge cap 10, in a cross-sectional top view.
  • the wall edge cap's arch shape, or any other similar shape of gradual slope change or modest curvature, eliminates or reduces the abrupt change in surface orientation along the flow path around a building corner 105 where two exterior wall surfaces 100 intersect. This will mitigate edge vortex formation and result in the reduction of aerodynamic forces, primarily the outward suction force, exerted on the downwind wall areas adjacent to the edge. Multiple straight segments can also be used to approximate an arched exterior shape for a wall edge cap.
  • the exterior surfaces of the wall edge cap can be optionally perforated to enhance the device's vortex-suppressing effects, as described for edge screens later in this application.
  • any appropriate means to attach and secure the devices to wall surfaces are allowable if it does not significantly affect or alter the exterior shape of the device in a way that detriments the vortex-suppressing function.
  • a set of cleats and fasteners 80 as illustrated in Figure 1 can be used for securing the apparatus.
  • Figure 2 shows an alternative configuration of a wall edge cap assembly 20 that functions in a similar fashion as that illustrated in Figure 1. Multiple straight segments can also be used to approximate the curved exterior shape.
  • Figure 3 illustrates a preferred configuration of wall edge screen 30 in a cross-sectional top view.
  • the perforated face protrudes outwardly from the wall corner 105, preferably along the axis of symmetry.
  • the wall edge screen employs a venting mechanism to suppress the vortex formation and vortex induced suction force.
  • the perforated face of a wall edge screen generally reduces the flow acceleration around the corner. At the same time it facilitates pressure equalization across the screen face and around the wall corner 105 through a "bleeding" or venting effect, which prevents vortex formation around and behind the outer edge of the windscreen. It also breaks the flow around the corner down to small, random and unorganized eddies, and leads to dissipation of kinetic energy.
  • Optional outer edge serration of the windscreen provides similar effects of flow breakdown and kinetic energy dissipation.
  • View 3A form Figure 3 is shown in Figure 3A to illustrate an example for face perforation and edge serration of a wall edge windscreen.
  • Figure 4 shows an alternative configuration of a wall edge windscreen assembly 40.
  • the perforated faces form an approximately symmetrical arrangement, each forming an angle to a wall 100.
  • the perforated face shown here forms a right angle to a wall surface, the acceptable angles range from the limit case as in Figure 3 (aligning with axis of symmetry) to that of about 45° with respect to the wall on the same side.
  • Figure 5 illustrates a preferred configuration of wall edge wind spoiler 50, again in a cross-sectional top view. The wind spoiler uses yet another mechanism to mitigate vortex formation around a wall comer 105 of a building.
  • the raised and bent spoiler plate 52 forces the wind flow around the wall corner to conform approximately to the exterior wall surfaces, and thus suppresses flow separation and vortex formation.
  • the resulting effect is the reduction of the wind suction force on the wall area downwind of the wall corner 105.
  • a plurality of methods is suitable for supporting the raised spoiler plate to the wall corner, as long as the support members do not collectively obstruct the airflow path between the raised spoiler plate and the wall corner.
  • a preferred option is to use significantly perforated, longitudinally continuous, plate-like supports 54 as exemplified in Figure 5A, which provide additional effects of flow breakdown and kinetic energy dissipation as described above for edge windscreens.
  • Figure 6 shows an alternative configuration to form an edge wind spoiler assembly 60.
  • the raised and bent plates 62 can be configured with multiple straight segments as shown herein or with curved ones.
  • the end segment of the raised plate shall preferably be approximately in parallel with one of the walls 100 secured thereto.
  • the perforated double plates 64 serve as supports to the raised plate segments and as a corner wind screen.
  • the devices can be made of any durable materials that provide mechanical strength and stiffness sufficient to sustain high winds and other weather elements over time. These include, but are not limited to, sheet metal, acrylic, and for the edge cap treated solid wood, etc. Extrusion, or cold form where applicable or other appropriate methods, can be used to manufacture the devices.
  • a generally symmetric shape is preferred for a wall edge vortex-suppressing device in that wind can come from either side of a building corner.
  • deviation from a symmetric configuration is allowable for any practical purposes as far as the alteration does not deviate from the spirit of this disclosure for wall edge vortex-suppressing devices. INSTALLATION AND OPERATtON
  • any appropriate means to attach and secure the devices to wall surfaces are allowable if it does not significantly affect or alter the exterior shape of the device in a way that detriments the vortex-suppressing function.
  • a set of cleats and fasteners can be used for securing the apparatus to the wall, as illustrated in the above figures.
  • An embodiment of this invention is a passive flow control device for wall edges. Once configured and installed properly, it stays functioning in such a way that it mitigates vortex formation around a wall edge and reduces wind loads on the wall, whenever the wind blows towards a building bearing such wall edge devices, and requires no active operational intervention.
  • wall edge vortex suppressors of this invention provide advantageous devices for mitigating wall edge vortex and wall suction, and are still among the simplest, most effective and reliable, inexpensive to manufacture and convenient to install, with little, if any, maintenance required.
  • the present invention provides a simple and unique method for improving building wind resistance, not only suitable for new constructions but also for retrofit on existing buildings.
  • Wall edge vortex suppressors can be made of any reasonably durable material with any appropriate means of fabrication as long as a configuration according to the spirit of this invention is accomplished to support the described working mechanism and to provide the associated functionality. Any appropriate conventional or new mounting method can be used to secure a wall edge vortex suppressor to a building corner without departing from the spirit of this invention.
  • the scope of the invention should be determined by the appended claims and their legal equivalents, rather than by the examples given.

Abstract

La présente invention concerne un appareil disposé le long de et fixé à un bord de mur pour réduire les tourbillons générés par le vent et les charges d'aspiration sur le mur, approprié et pratique pour les nouvelles constructions et les rattrapages sur des bâtiments existants. Des configurations préférées sont décrites et comprennent des types tels qu'un couvercle pour un bord de mur, un écran anti-vent pour un bord de mur et un déflecteur de vent pour un bord de mur, chacun utilisant un mécanisme aérodynamique primaire distinctif, souvent avec des mécanismes secondaires facultatifs pour optimiser les effets de suppression de tourbillon.
PCT/US2007/020556 2007-09-24 2007-09-24 Dispositif de suppression de tourbillon pour bord de mur WO2009041934A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2007/020556 WO2009041934A1 (fr) 2007-09-24 2007-09-24 Dispositif de suppression de tourbillon pour bord de mur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2007/020556 WO2009041934A1 (fr) 2007-09-24 2007-09-24 Dispositif de suppression de tourbillon pour bord de mur

Publications (1)

Publication Number Publication Date
WO2009041934A1 true WO2009041934A1 (fr) 2009-04-02

Family

ID=40511707

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/020556 WO2009041934A1 (fr) 2007-09-24 2007-09-24 Dispositif de suppression de tourbillon pour bord de mur

Country Status (1)

Country Link
WO (1) WO2009041934A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6212836B1 (en) * 1999-05-19 2001-04-10 Plastics Components, Inc. Self-aligning drywall corner bead
US20050210759A1 (en) * 2001-05-10 2005-09-29 Boral Lifetile Inc. Vented eaves closure
US20070113489A1 (en) * 2005-11-10 2007-05-24 Bruce A. Kaiser Wind spoiler for roofs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6212836B1 (en) * 1999-05-19 2001-04-10 Plastics Components, Inc. Self-aligning drywall corner bead
US20050210759A1 (en) * 2001-05-10 2005-09-29 Boral Lifetile Inc. Vented eaves closure
US20070113489A1 (en) * 2005-11-10 2007-05-24 Bruce A. Kaiser Wind spoiler for roofs

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