Design of small-size and high-pressure centrifugal fans used in helicopters

Based on the characters of high-pressure, high-speed and small-size of centrifugal fans used in helicopters, the basal structure parameters of centrifugal fans were analyzed and calculated. Efforts were made to analyze the flowing rules of gas in the impeller. Influence of the distribution of gas vortex on the across-section was discussed. Restriction requirements of selecting the gas vortex were put forward. The shapes of meridian-section and across-section were designed. It was proved that the efficiency of centrifugal fans can be evidently improved by reasonably determining the distribution of gas vortex.