Micro Cooling Fan blade design considerations

    "Micro Cooling Fan" Leaves of curvature: within a certain range, the greater the curvature of the blade, at the same speed, the greater the kinetic energy of the gas, i.e., the larger the air volume and pressure; same time, the greater the drag on the blade, the motor requires greater torque. When the ratio of the arc height / chord length of more than 0.1, it is no longer lift coefficient increases linearly, the "range" that is 0.05 & lt; arc height / chord & lt; 0.1.
"Micro Cooling Fan" Blade Angle: angle greater the pressure difference between the upper and lower surfaces of the blade, the greater the pressure at the same speed; but the surface pressure, may have reflux phenomenon, but lower fan performance. Thus, the blade angle also should be raised within certain limits.
"Micro Cooling Fan" blade spacing: the distance between the blades is too small, will cause air turbulence, increase the friction surface of the blade, reduce fan efficiency; the distance between the blades is too large, it will lead to increase in pressure loss, lack of pressure.