| 摘要 |
PCT No. PCT/GB91/01964 Sec. 371 Date Jun. 22, 1993 Sec. 102(e) Date Jun. 22, 1993 PCT Filed Nov. 8, 1991 PCT Pub. No. WO92/11444 PCT Pub. Date Jul. 9, 1992.A gas turbine engine includes a casing cooling system which operates in one of two conditions, the first being operational at engine cruise, where all of the cooling air is initially directed onto a specific region of the casing; under full power conditions, some of the cooling air is directed onto the specific casing region and the reminder directed onto the reminder of the casing; the cooling system operates to optimize turbine blade/casing radial clearances.
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