Structural Design of Extruded Profiles Based on Simulation

In this paper, through the introduction of ABH related theory, a variety of optimized structures are established and compared. By changing the layout of holes in extruded profiles, the vibration characteristics of extruded profiles are studied by using the control variable method. It is found that for single extrusion profile, the through hole (the radius is 8mm to 10mm, the chamfer is 30 degrees) compared with the structure without holes, the natural frequency of the structure is increased by 7Hz from the first order to 20 Hz from the seventh order. For the spliced extruded profiles, the wedge-shaped hole structure with 8mm to 10mm has better vibration damping performance. The application of ABH structure can effectively improve the vibration characteristics of extruded profiles.

Effect of backward injection with combined hole on film colling performance

This study investigates the film cooling performance and flow features of backward injection with combined hole. This concept is evaluated by comparison to forward injection with combined hole and other forms with both injections, forward and backward. The shapes are namely, cylindrical hole, conical hole and fan-shaped hole. The eight configurations are computed for three blowing ratios M=0.5, 1.0 and 1.5. The air coolant was injected through holes inclined at 35° and 155° for forward and backward injection respectively. The lateral averaged film cooling effectiveness and the distribution of adiabatic film cooling efficiency are studied using commercial software ANSYS- CFX. In addition, several velocity vectors and contours are presented for analyzing the thermal behavior. The results show that a uniform coverage is obtained by the backward injection which leads to best cooling. The maximum improvement of film cooling is obtained by backward injection with combined hole at M=1.5.