Dual nozzle cabin ventilation system
AssigneeThe Boeing Company
InventorRaymond H. Horstman
Life of this patent
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Abstract
A supply air ventilation system for providing symmetrical airflow distribution in the cabin of an aircraft, while avoiding excessive flow velocity. The ventilation system includes a supply duct (106) from which pressurized supply air is delivered through a first nozzle (118) at a relatively higher velocity and lower flow volume than through a second nozzle (110). Air flowing through the first nozzle attaches to a surface (132) of an overhead storage bin (16) that curves downwardly into the cabin (12) of the aircraft due to the Coanda Effect, and mixes with the lower velocity higher volume air flowing through the second nozzle, thereby carrying it downwardly into the aircraft cabin.
Claims19
Apparatus for supplying a fluid to an enclosed space along a surface extending into the space, comprising:
- (a) a pressurized fluid supply duct extending adjacent the surface, in fluid communication with a source of a fluid having a pressure in excess of that in the enclosed space and operative to convey the pressurized fluid;
- (b) nozzle means in fluid communication with the pressurized fluid supply duct and disposed adjacent the surface, for directing a flow of the pressurized fluid from said supply duct into the space with sufficient velocity that the flowing fluid attaches to the surface, following it into the space;
- and
- (c) diffuser means also in fluid communication with the pressurized fluid supply duct and disposed adjacent the nozzle means, for directing a flow of pressurized fluid from said supply duct into the space at a substantially lower flow velocity and a higher volumetric flow rate than the fluid flow-directed by the nozzle means, the fluid at the lower flow velocity mixing with and being carried along with the fluid at the higher flow velocity as it flows from the nozzle, and into the space along the surface.
Ventilation apparatus for distributing pressurized air into an enclosed space comprising:
- (a) a pressurized air supply duct carrying flowing air at a pressure substantially greater than that of the enclosed space, disposed generally at a perimeter of the enclosed space and adjacent a surface associated with the space that extends inwardly of the space, away from the duct;
- (b) a flange extending adjacent the surface, defining a first nozzle with an outlet in direct fluid communication with the supply duct, through which the pressurized air flows into the space;
- (c) means for restricting the flow of the pressurized air from the supply duct through the first nozzle outlet while maintaining a flow velocity sufficient so that the airflow exiting the outlet attaches to the adjacent surface, following it inwardly into the space;
- (d) a second nozzle, also in direct fluid communication with the supply duct and having a plurality of outlets disposed adjacent the flange, through which the pressurized air flows into the space at a volumetric flow that is substantially greater than that through the first nozzle;
- (e) means for restricting the flow of the pressurized air from the supply duct through the second nozzle to a velocity substantially less than the velocity of the pressurized air exiting the first nozzle outlet, the air exiting the second nozzle mixing with the higher velocity air exiting the first nozzle and being carried by it over the surface and into the space.
Ventilation apparatus for distributing pressurized air into an enclosed space, comprising:
- (a) a supply duct adapted to convey the pressurized air along a path extending adjacent the space;
- (b) a nozzle in fluid communication with the supply duct, extending linearly along at least a portion of the path and having an opening disposed adjacent a colinear surface that curves away from the nozzle into the enclosed space;
- (c) a first flow restrictor disposed in an airflow path between the supply duct and the nozzle opening and sized so that the pressurized air flowing out of the nozzle opening achieves sufficient velocity to attach to the adjacent surface, following it into the enclosed surface;
- and
- (d) a diffuser, in fluid communication with the supply duct and extending adjacent a side of it, the diffuser including a second flow restrictor disposed in an airflow path between the supply duct and the enclosed space, the second flow restrictor comprising a diffuser panel having a plurality of outlets for the air flowing from the supply duct through the diffuser, the air flowing through the diffuser panel outlets having a substantially lower velocity and a higher volumetric flow rate than the air flowing from the nozzle opening, the higher velocity air flowing from the nozzle along the surface and into the space tending to mix with and carry into the space the lower velocity air.
Dependencies are inferred from the claim text.