The Influence of the Blade Airfoil Bend Angle on Its Thermal and Thermal Stress State under Nonuniform Heating

The author studied the influence of the turbine-blade-airfoil bend angle on the blade thermal and thermal stress state under nonsteady-state temperature conditions. It is shown that at nonuniform heating, the influence of the bend angle on the level of temperatures and temperature distribution over the airfoil is insignificant, whereas the level of thermal stresses on the blade edges changes appreciably due to internal constraint. It has been found that high levels of thermal stresses may occur in turbine rotor and nozzle blades irrespective of the magnitude of the bend angle when their thermal bending due to nonuniform heating is restricted by the external constraint.