Low drag low noise devices using jet flow control
Low drag low noise devices are described herein that use passive jet flow control to reduce the drag and noise created by motor vehicles (e.g., motor vehicle side view mirrors and their main bodies) while the motor vehicles travel through a fluid. The low drag low noise devices described herein comprise a lengthwise axis, an outer body, and an inner body. The outer body and the inner body cooperatively define a channel through which fluid can pass during use.
1. A low drag low noise device having a lengthwise axis, the low drag low noise device comprising:
an outer body having a first end, and a second end, the outer body defining a first opening, a second opening, an inner surface, and an outer surface, the inner surface extending from the first opening to the second opening and defining a passageway, the outer surface defining a plurality of peaks and troughs; and
an inner body attached to the outer body and at least partially disposed within the passageway defined by the outer body, the inner body having a first end, a second end, and an outer surface;
wherein the inner surface of the outer body and the outer surface of the inner body define a channel within the passageway of the outer body, the inner surface of the outer body and the outer surface of the inner body configured to allow a fluid to pass through the channel from the first end of the outer body to the second end of the outer body such that the fluid exits the channel at the second end of the outer body at an angle that is directed toward said lengthwise axis of said low drag low noise device and away from the second end of the inner body.
2. The low drag low noise device of claim 1 , wherein the plurality of peaks and troughs define a sinusoidal edge.
3. The low drag low noise device of claim 2 , wherein the sinusoidal edge is defined along a plane that is orthogonal to said lengthwise axis of said low drag low noise device.
4. The low drag low noise device of claim 2 , wherein a distance is disposed between the inner surface of the outer body and the outer surface of the inner body along a plane that is disposed orthogonal to said lengthwise axis of said low drag low noise device; and
wherein the sinusoidal edge has an amplitude that is equal to about 1 time to 4 times the distance between the inner surface of the outer body and the outer surface of the inner body.
5. The low drag low noise device of claim 1 , wherein the peaks are disposed at the second end of the outer body; and
wherein the troughs are disposed between the first end and the second end of the outer body.
6. The low drag low noise device of claim 1 , wherein the second end of the outer body has a thickness that extends from the outer surface of the outer body to the inner surface of the outer body; and
wherein the thickness is uniform.
7. The low drag low noise device of claim 1 , wherein the outer surface of the outer body has a projection that extends from the outer surface and away from said lengthwise axis of said low drag low noise device.
8. The low drag low noise device of claim 7 , wherein the projection has a first end and a second end, the first end of the projection having a surface that is disposed orthogonal to said lengthwise axis of said low drag low noise device, the second end of the projection having a surface that is disposed orthogonal to said lengthwise axis of said low drag low noise device.
9. The low drag low noise device of claim 7 , wherein the projection has a first end and a second end, the second end of the projection disposed on a plane that contains the second end of the outer body.
10. The low drag low noise device of claim 7 , wherein the projection has a top surface that is substantially parallel to said lengthwise axis of said low drag low noise device.
11. The low drag low noise device of claim 1 , wherein the outer surface of the outer body has a plurality of projections that extend from the outer surface and away from said lengthwise axis of said low drag low noise device.
12. The low drag low noise device of claim 1 , wherein the outer body has a length that extends from the first end of the outer body to the second end of the outer body; and
wherein a portion of the length of the outer surface of the outer body has a waved configuration.
13. The low drag low noise device of claim 1 , wherein the inner body is attached to a vehicle.
14. A low drag low noise device having a lengthwise axis, the low drag low noise device comprising:
an outer body having a first end, and a second end, the outer body defining a first opening, a second opening, an inner surface, and an outer surface, the second end of the outer body having a uniform thickness extending from the outer surface of the outer body to the inner surface of the outer body, the inner surface extending from the first opening to the second opening and defining a passageway, the outer surface defining a plurality of peaks and troughs that define a sinusoidal edge; and
an inner body attached to the outer body and at least partially disposed within the passageway defined by the outer body, the inner body having a first end, a second end, and an outer surface;
wherein the inner surface of the outer body and the outer surface of the inner body define a channel within the passageway of the outer body, the inner surface of the outer body and the outer surface of the inner body configured to allow a fluid to pass through the channel from the first end of the outer body to the second end of the outer body such that the fluid exits the channel at the second end of the outer body at an angle that is directed toward said lengthwise axis of said low drag low noise device and away from the second end of the inner body.
15. The low drag low noise device of claim 14 , wherein the sinusoidal edge is defined along a plane that is orthogonal to said lengthwise axis of said low drag low noise device.
16. The low drag low noise device of claim 14 , wherein a distance is disposed between the inner surface of the outer body and the outer surface of the inner body along a plane that is disposed orthogonal to said lengthwise axis of said low drag low noise device; and
wherein the sinusoidal edge has an amplitude that is equal to about 1 time to 4 times the distance between the inner surface of the outer body and the outer surface of the inner body.
17. The low drag low noise device of claim 14 , wherein the outer surface of the outer body has a projection that extends from the outer surface and away from said lengthwise axis of said low drag low noise device.
18. The low drag low noise device of claim 14 , wherein the outer body has a length that extends from the first end of the outer body to the second end of the outer body; and
wherein a portion of the length of the outer surface of the outer body has a waved configuration.
19. The low drag low noise device of claim 14 , wherein the inner body is attached to a vehicle.
20. A low drag low noise device having a lengthwise axis, the low drag low noise device comprising:
an outer body having a first end, a second end, and a length extending from the first end of the outer body to the second end of the outer body, the outer body defining a first opening, a second opening, an inner surface, and an outer surface, the second end of the outer body having a uniform thickness extending from the outer surface of the outer body to the inner surface of the outer body, the inner surface extending from the first opening to the second opening and defining a passageway, the outer surface defining a plurality of peaks and troughs that define a sinusoidal edge along a plane that is orthogonal to said lengthwise axis of said low drag low noise device, a portion of the length of the outer surface of the outer body having a waved configuration; and
an inner body attached to a vehicle and to the outer body, the inner body at least partially disposed within the passageway defined by the outer body, the inner body having a first end, a second end, and an outer surface;
wherein the inner surface of the outer body and the outer surface of the inner body define a channel within the passageway of the outer body, the inner surface of the outer body and the outer surface of the inner body configured to allow a fluid to pass through the channel from the first end of the outer body to the second end of the outer body such that the fluid exits the channel at the second end of the outer body at an angle that is directed toward said lengthwise axis of said low drag low noise device and away from the second end of the inner body.