This application relates to a turbine nozzle for use in an air cycle machine.
Air cycle machines are known and, typically, provide air as part of a cabin air conditioning and temperature control system on an aircraft.
An air cycle machine typically includes at least one turbine receiving a source of compressed air and driving a compressor. The combination of the turbine and compressor condition the air for use on the aircraft.
A nozzle for use in an air cycle machine has a plate. A plurality of vanes extends for a height away from the plate and a width is defined as the closest distance between two adjacent vanes. A ratio of the height to the width is between 0.3563 and 0.4051. An air cycle machine and a method of repair are also disclosed.
These and other features may be best understood from the following drawings and specification.
An air cycle machine 20 incorporates a turbine rotor 22 as shown in
A primary nozzle 28 and secondary nozzle 21 condition the air from the inlet 24 as it approaches the turbine rotor 22.
As shown in
During ground operation, a pressure in the turbine inlet chamber 24 is sufficiently high to overcome a force from spring 54. The slider 52, thus, sits in the closed position as illustrated.
At higher altitude, the relationship described above is no longer true and the slider 52 can move to the left as shown in this Figure and increase a nozzle flow area. More air is needed for cooling the aircraft cabin on the ground, and this nozzle combination provides more while an associated aircraft is on the ground.
The primary nozzle 28 is illustrated in
As shown in
As shown in
In embodiments, a ratio of d1 to d2 was between 0.3563 and 0.4051. The total nozzle flow area may range between 0.3963 and 0.4505 square inches (2.5565-2.9066 centimeters).
The nozzle 28 has a tungsten carbide erosion coating. Nozzle 287 is formed of a base of aluminium and then provided with a tungsten carbide erosion coating. Preferably, a high velocity oxy fuel coating technique is provided utilizing continuous burning.
A method of repairing an air cycle machine 20 includes the steps of removing a nozzle 28 from a location adjacent a turbine rotor in an air cycle machine. A replacement nozzle 28 is then mounted adjacent the turbine.
The secondary nozzle and shroud 21 is disclosed and claimed in co-pending application Ser. No. 13/869,051, entitled Turbine Nozzle and Shroud for Air Cycle Machines, and filed on even date herewith.
Although an embodiment of this invention has been disclosed, a worker of ordinary skill in this art would recognize that certain modifications would come within the scope of this disclosure. For that reason, the following claims should be studied to determine the true scope and content of this disclosure.
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