An aerofoil and method of making an aerofoil

摘要

An aerofoil 50 and in particular an aerofoil utilised as a turbine blade within gas turbine engines generally incorporate passages 52, 53 along which fluid flows to provide cooling within the aerofoil 50. Previously straight webs were utilised in order to define passages but such configurations limit design choices with regard to achieving torsional and flap vibrational characteristics. By provision of webs 51 which have chordal variation in a serpentine or S shape wider design choices are provided with respect to achieving torsional and flat vibration control. Webs 51 with such chordal variation are achieved through manufacturing processes which remove forming cores by leaching or a lost wax technique or other erosion process. It will also be understood that chordal variations in the webs can create flow rate variations to facilitate particulate separation in a fluid flow through the passages 52, 53 within an aerofoil.