Patent ID: 7431559

Claim:
A gas turbine engine comprising: at least one rotor for rotating about a central axis; at least one vane, said vane having a leading edge and a trailing edge, said vane receiving an impingement tube adjacent said leading edge, said impingement tube having a leading edge and an aft end spaced from said leading edge and towards said trailing edge of said vane; an outer air source for directing air from a radially outer location into said impingement tube, and an inner air source for directing air from a radially inner location into said impingement tube; and said impingement tube including a radially outer portion and a radially inner portion, with said radially inner portion receiving air from said inner air source and said radially outer portion receiving air from said outer air source, said radially inner and outer portions having impingement air holes for directing impingement air to a position adjacent said leading edge of said vane, and at least said radially outer portion being configured to direct a greater volume of impingement air toward said aft end of said vane than the volume directed toward said leading edge.