CPC F04D 29/444 (2013.01) [B64D 13/06 (2013.01); F01D 17/08 (2013.01); F01D 17/143 (2013.01); F01D 17/145 (2013.01); F01D 17/18 (2013.01); F04D 29/464 (2013.01); B64D 2013/0603 (2013.01); F16K 11/065 (2013.01)] | 20 Claims |
1. A variable diffuser comprising:
a backing plate;
a shroud;
a first divider between the backing plate and the shroud;
a first diffuser channel between the backing plate and the first divider, the first diffuser channel comprising:
a first channel inlet; and
a first outlet;
a second diffuser channel between the first divider and the shroud, the second diffuser channel comprising:
a second channel inlet adjacent to the first channel inlet; and
a second outlet adjacent to the first outlet; and
a valve controlling flow through the second diffuser channel, wherein the valve moves between a first position and a second position, wherein the valve is connected to a servo pressure duct which provides servo pressure air to move the valve between the first position and the second position, and wherein the servo pressure air is a mixture of ambient pressure air and compressed pressure air.
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