| 摘要 |
<p>A method 600 of reducing turbine clearances of a jet engine by reducing engine response during predetermined flight conditions. The method includes identifying a flight condition in which rapid engine response is not needed 604, reducing requested or actual engine acceleration response, and reducing turbine blade clearances using a clearance control system 606. The predetermined flight condition may be a step change in altitude, or a steady climb. Identifying a flight condition in which rapid engine response is not needed may include analyzing a planned flight path, using conditions on previous flights, analyzing the weather, and/or monitoring changes to one or more parameters over time. The parameters may include altitude, mach number (speed) and throttle setting. Reducing engine acceleration response may comprise rate-limiting engine acceleration in response to throttle changes. The engine acceleration response may be reduced only for throttle changes larger than required to maintain cruise, and/or throttle changes which do not indicate an emergency manoeuvre.</p> |
