大涵道比风扇新型高低静叶结构性能研究

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

关键词:  大涵道比风扇  高低静叶  平衡稠度  扩压能力  总压损失  扩稳

Key words:  High bypass ratio fan  Solidity-balanced stator  Balance solidity  Diffusion capability  Total pressure loss  Stability enhancement

摘要:

针对大涵道比风扇静叶尖、根稠度不匹配问题，为补偿静叶叶尖稠度、增大叶尖载荷、抑制叶尖的气流分离，提出一种在静叶叶尖引入低叶片结构的新型高低静叶结构，并通过相应数值模拟分析检验高低静叶结构在大涵道比风扇静子应用的有效性。结果表明:低叶片的引入有效抑制静叶叶尖的气流分离，改善流道内的流场结构，在单静子环境下，静叶级的扩压能力提升1.52%，总压损失降低23.6%；在级环境下，静叶级的扩压能力提升0.93%，总压损失降低15.0%；并且高低静叶结构在级环境下表现出较好的扩稳能力，流量裕度可提高53.8%；低叶片长度影响高低静叶结构性能，存在最优的低叶片长度。

Abstract:

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.