초록 ▼

A compressor casing is configured to surround blade tips in a compressor stage. The casing includes stall grooves with adjoining lands defining respective local gaps with the blade tips. At least one of the lands is offset to locally increase a corresponding one of the gaps larger than the nominal g

A compressor casing is configured to surround blade tips in a compressor stage. The casing includes stall grooves with adjoining lands defining respective local gaps with the blade tips. At least one of the lands is offset to locally increase a corresponding one of the gaps larger than the nominal gap for the casing to reduce tip rubbing thereat.

대표청구항 ▼

[ Accordingly, what is desired to be secured by Letters Patent of the United States is the invention as defined and differentiated in the following claims in which we claim:] [1.]1. A compressor stage comprising:a rotor disk;a plurality of circumferentially spaced apart blades extending radially out

[ Accordingly, what is desired to be secured by Letters Patent of the United States is the invention as defined and differentiated in the following claims in which we claim:] [1.]1. A compressor stage comprising:a rotor disk;a plurality of circumferentially spaced apart blades extending radially outwardly from said disk, and each blade including circumferentially opposite pressure and suction sides extending radially from root to tip and axially between leading and trailing edges;an arcuate casing surrounding said blade tips and spaced radially outwardly therefrom to define a nominal tip gap therebetween;a plurality of circumferentially extending stall grooves disposed in an inner surface of said casing and facing said blade tips, and spaced axially apart by adjoining lands defining respective local gaps with said blade tips; andat least one of said lands is offset to locally increase a corresponding one of said local gaps larger than said nominal gap for reducing tip rubbing at said offset land as said tips rub said casing.