Study on Performance of High Bypass Ratio Fan with a Novel Solidity-Balanced Stator Structure

A novel solidity-balanced stator structure for high bypass ratio fan was presented aimed at solving the non-matching of solidity between tip and root. By increasing the tip solidity, the structure would enhance the blade load in tip region which is conductive to control flow separation. And the validity of the structure of solidity-balanced stator was verified by numerical simulation. The results showed that the introduction of small blades inhibited the flow separation on the tip of stator, and improved the flow field structure of the flow passage. In the single stator environment, the expansion capacity of stator increased by 1.52%, and the total pressure loss reduced by 23.6%. In the stage environment, the expansion capacity of stator increased by 0.93%, and the total pressure loss reduced by 15.0%. Furthermore, the structure of solidity-balanced stator showed better ability of stability enhancement in the stage environment, and flow margin increased by 53.8%. The length of small blade affected the performance of the solidity-balanced stator, and there was an optimum small blade length.