Small Cooling Fan deviated

When "Small Cooling Fan" operating conditions deviate the flow direction changes resulting in each blade angle of attack can not be imported identical. If a blade angle of attack at the entrance reaches a critical value, the first place on the blade stall, but not all "iOS雷竞技 " blade stall occurs simultaneously, this phenomenon be continued, so that caused the stall clogged area along with the impeller rotating in the opposite direction to promote, which produce the so-called "rotating stall" phenomenon. "iOS雷竞技 " into the zone run unstable conditions will produce a number of rotating stall area to the impeller.