A Cold-Hot State Conversion Method for Compressor Structure

Compressor component work at high temperature, high pressure and high centrifugal force, the shape at cold state is different form hot state. The aim of a component cold-hot state conversion is to obtain the original size and shape, by the condition of knowing the size after deformation and the load at the hot state, which will be subtracting by the size difference caused by temperature, pressure and centrifugal force. Conventionally, the Cold-Hot State conversion carried out by compressor engineer is more like a “tip clearance conversion”, people pay more attention to the clearance between blade tip and casing, after gaining the deformation of blade and casing, they just translate the blade tip or casing to get an appropriate clearance to make sure the compressor work safety. For a compressor with small size which the blade transformation is tiny, this traditional method may be appropriate, but while the size of compressor is larger, the blade deformation itself cannot be neglected, so, in this paper, a finite-element thermal-structure based iteration modify method was established, which can achieve the goal of both cold to hot and hot to cold bidirectional conversion.