| 摘要 |
A method of characterising mechanical and thermal growth of a rotor tip clearance arrangement (78) and a method of controlling such an arrangement. The characterisation method comprising constructing a finite element model (48) and calibration cases (60); run the model for the calibration cases to obtain displacements; and calculating component growth therefrom. The growth is characterised and scaled for the operating conditions. The clearance is calculated in a time step from the growths and input to a control arrangement for subsequent time steps. |
