Turbine, particularly useful for small aircraft

Details Turbine, particularly useful for small aircraft Turbine, particularly useful for small aircraft

F - Mech Eng,Light,Heat,Weapons

01

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F01D 25/18 (2006.01) F01D 19/00 (2006.01) F01D 25/04 (2006.01) F01D 25/16 (2006.01) F02C 7/06 (2006.01) F02C 7/20 (2006.01) F02C 7/36 (2006.01) F02C 9/28 (2006.01) F23R 3/20 (2006.01) F23R 3/52 (2006.01) F23R 3/58 (2006.01)

Patent

CA 2504114

A turbine essentially comprises a mechanical generating system including a combustion chamber (2) providing useful mechanical work on a high-speed shaft (8), a speed step-down system (18-20) for receiving rotational energy from the high-speed shaft and an output system including a low-speed shaft (17) receiving rotational energy from the speed step-down system for delivering mechanical from the turbine to a load. Auxiliary systems are kept to a minimum for lubrication, control, operation and start-up functions, thereby making the turbine particularly attractive for light aircraft. The combustion chamber is designed with deflectors (46) generating vortices in a secondary gas flow into the combustion chamber, thereby confining the flame front from penetrating into the cold region (3) of the chamber under variable operating conditions, simplifying cooling of the chamber walls. The high-speed shaft is cantilever mounted on a pair of bearings (9A-9B) in the cold region and is provided with a longitudinal duct and an array of fine orifices (27) in the wall of the shaft which direct pressurized oil in the duct in the form of jets which impinge on the bearings with little relative speed, thereby increasing wetting of the bearing components. Oil is supplied to the duct by means of a positive-displacement pump (23) directly driven by the shaft. The output pressure of the pump provides a signal which is indicative of turbine speed and hence used to control the turbine start-up sequence. The turbine further includes devices for de-coupling vibrations between the three systems thereof, including a loosely mounted spline (16) coupling the high-speed shaft to the step-down system and disk dampening means (41) coupling the step-down system to the low-speed output shaft.

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