This application relates to a turbine nozzle for use in an air cycle machine.
Air cycle machines are known and, typically, include one or more turbines which receive a compressed air source, and are driven to rotate. The turbines, in turn, rotate a compressor rotor. Air is conditioned by the air cycle machine and moved for use in an aircraft cabin air conditioning and temperature control system.
The turbines are typically provided with a nozzle and shroud which controls the flow of air upstream and downstream of a turbine rotor.
A nozzle and shroud for use in an air cycle machine has a plate and a shroud curving in a first axial direction about a center axis of the shroud relative to the plate. A plurality of vanes extends in a second axial direction away from the plate. The plurality of vanes extends for a height away from the plate and a width defined as the closest distance between two adjacent vanes, with a ratio of the height to the width being between 0.1091 and 0.1401. 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.
As shown in
As shown in
As shown in
The nozzle 21 and shroud 50 has a tungsten carbide erosion coating. The shroud and nozzle 127 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.
In embodiments, a ratio of d1 to d2 is between 0.1091 and 0.1401. The total flow area ranges between 0.2148 and 0.2759.
A method of repairing the air cycle machine 20 includes the steps of removing a nozzle and shroud combination 21/50 from a location adjacent turbine rotor 22. The removed nozzle and shroud combination is replaced with a replacement nozzle and shroud combination 21/50.
Details of the primary nozzle 28 are disclosed and claimed in co-pending application serial number ______, Attorney Docket No. PA25466US; 67010-490US1, entitled Turbine Nozzle 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.