The Effect Of Jet Angle And Velocity Ratio On
Turbine Blade Film Cooling
Author(s)
A. K. Al Taie & M. S. Kassim
Abstract
This work is concerned with the thermal effect of the turbine blade by film
cooling. The jet flow penetration and flow structure was simulated and solved
numerically. This investigation presents a tool to obtain qualitative information
about the penetration area and flow structure of the mixing flow at different jet
angle configurations. Two models of airfoil (NACA 0021) with hole diameters,
d=0.1 and 0.2 cm were studied. The simulation was carried out using the
commercial code (FLUENT 6.3). Several cases were considered; including
three-velocity ratio, VR=0.3, 0.7, 1,1.5, 2 and two jet suction angles, ß of 37.50
and 900, and four different angles of attack ,α= 00, 50, 100, and 150. The cooling
films build up on the blade surface was simulated. The work gives a clear picture
of the penetration area for the normal and angled-injection cases. The results at
different sections, x/s= 0.5 and 0.9 for the first and second model provided the
optimum holes rows spacing and the low suction angle for maximum film
cooling effectiveness.
Keywords: gas turbine, blade cooling, jet flow, numerical simulation, film
cooling.
Keywords
Keywords: gas turbine, blade cooling, jet flow, numerical simulation, film
cooling.
Related Book
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