Micro Cooling Fan blade radian

"Micro Cooling Fan" blade curvature: in addition to the blades in cross section having a curvature, the plane is not in the plan view extends straight along the radial direction, but is slightly curved toward the direction of rotation, showing a certain arc If the blade radially. extending straight, "Micro Cooling Fan" driven rotating flow in the outlet side will show a widely scattered, air distance is short, and "power" is not focused; if the current product version slightly curved, you can ensure that the blown air concentrated in the columnar space in front of the outlet, increasing the air pressure from the fan blade curvature: in a certain range, the greater the curvature of the blade, at the same rotational speed, the greater the kinetic energy of the gas, i.e., "Micro Cooling Fan" air volume and the greater the wind pressure; same time, the greater the drag blade, require a larger motor torque when the camber / chord ratio exceeds 0.1, the lift coefficient is no longer increases linearly, the "certain range."