Noise reducing fire suppression nozzles
A fire suppression nozzle can include a first fluid channel configured to be in fluid communication with a first fluid having a first flow velocity and a second fluid channel configured to be in fluid communication with a second fluid having a second flow velocity. A mixer can be disposed between the first fluid channel and the second fluid channel such that the mixer is configured to induce streamwise vorticity in at least the first fluid exiting first fluid channel to cause mixing of the first fluid and the second fluid to reduce a flow speed of a mixture of the first fluid and the second fluid.
1. A fire suppression nozzle, comprising:
a first fluid channel configured to be in fluid communication with a first fluid having a first flow velocity;
a second fluid channel configured to be in fluid communication with a second fluid having a second flow velocity; and
a mixer disposed between the first fluid channel and the second fluid channel such that the mixer is configured to induce streamwise vorticity in at least the first fluid exiting the first fluid channel to cause mixing of the first fluid and the second fluid to reduce a flow speed of a mixture of the first fluid and the second fluid, wherein streamwise vorticity includes rotational flow, wherein the first fluid channel is defined by a nozzle body, wherein the mixer is defined by the nozzle body or attached to the nozzle body, wherein the second fluid channel is defined partially by an upper shroud disposed around the nozzle body, the second fluid channel defined at least partially between the upper shroud and the nozzle body, wherein the second fluid channel is defined partially by a lower shroud attached to or integral with the nozzle body and/or the mixer downstream of the mixer, wherein the lower shroud and the upper shroud define an outlet of the second fluid channel therebetween where mixed first and second fluid effuse to the atmosphere, wherein the mixer is defined by a lobe mixing shape to cause both the first fluid and the second fluid to rotate together, wherein the mixer is horizontally oriented such that the first fluid effuses toward the outlet and lobe mixes with the second fluid as it exits the first fluid channel.
2. The nozzle of claim 1 , wherein the mixer includes angled holes configured to effuse the first fluid from the first fluid channel into the second fluid channel.
3. The nozzle of claim 2 , wherein the angled holes are angled relative to each other to cause vorticity in first fluid as it exits the first fluid channel.
4. The nozzle of claim 1 , wherein the upper shroud is attached to the nozzle body by one or more ribs.
5. The nozzle of claim 4 , wherein the second fluid is air and the upper shroud is open to the atmosphere to allow air to be drawn in by the flow entrainment effect from the first fluid effusing from the first fluid channel to mix air with the first fluid.
6. The nozzle of claim 1 , wherein the outlet can include a constant flow area or an expanding flow area.
7. The nozzle of claim 1 , wherein the mixer is vertically oriented such that the first fluid effuses toward the lower shroud and lobe mixes with the second fluid as it exits the first fluid channel.
8. A nozzle body for a fire suppression nozzle, comprising:
a first fluid channel configured to be connected to a first fluid source for fire suppression; and
a mixer defined by or attached to the first fluid channel, wherein the mixer is configured to induce streamwise vorticity in at least the first fluid as it exits the first fluid channel to cause mixing of the first fluid and a second fluid to reduce a flow speed of a mixture of the first fluid and the second fluid, wherein streamwise vorticity includes rotational flow, wherein the mixer is defined by a lobe mixing shape to cause both the first fluid and the second fluid to rotate together, wherein the mixer is horizontally oriented such that the first fluid effuses toward the outlet and lobe mixes with the second fluid as it exits the first fluid channel.
9. The nozzle body of claim 8 , wherein the mixer includes angled holes configured to effuse the first fluid from the first fluid channel into the second fluid channel.
10. The nozzle body of claim 9 , wherein the angled holes are angled relative to each other to cause vorticity in first fluid as it exits the first fluid channel.
11. The nozzle body of claim 8 , wherein the mixer is vertically oriented such that the first fluid effuses toward a lower shroud and lobe mixes with the second fluid as it exits the first fluid channel.