METHOD OF CALIBRATING THE AIR FLOW OF A SWIRLER OF A GAS TURBINE BURNER

A method of calibrating a swirler for a burner of a turbine engine, the swirler having a plurality of vanes and a plurality of mixing channels between the vanes, wherein each mixing channel directs air from a radially outer end of the mixing channel to a radially inner end of the mixing channel, the method of calibrating the swirler including: determining a flow characteristic of the swirler, calculating the difference between the determined flow characteristic of the swirler and a predetermined flow characteristic of the swirler, and dependent on the difference, applying a calibration to the swirler to alter its flow characteristic, the calibration having a known influence on the flow characteristic such that the altered flow characteristic is within an acceptable tolerance of the predetermined flow characteristic.