| Popis: |
This paper reports computational investigation carried out on T106 LP turbine linear cascade to optimize the blade performance and reduce the blade count around the LP turbine rotor by decreasing blade solidity. T106 LP turbine blade of chord 196 mm and two different blade solidities of 1.25 and 1.176 were used. Passive flow control device—Gurney flap (GF) was attached to the trailing edge of the blade. The GFs of heights 1.33% Ch and 2% Ch were used in simulations. A two-equation eddy viscosity turbulence model, shear stress transport (SST) model was considered for all the computations along with gamma–theta (γ–θ) transition model. Computations were carried out for all the cases at four different Reynolds numbers. Lift coefficient, total pressure loss coefficient, overall integrated loss coefficient, and lift coefficient to overall integrated loss coefficient ratio were used as a measure of aerodynamic performance for the cascade. From the computations, it was found that on increasing the blade spacing by keeping the GF height constant, the performance of the turbine cascade decreases. But, the performance can be improved by increasing the flap height appropriately. For the cascade configuration with increased spacing, an optimal GF height was determined. |
