风扇/压气机静子周向限位失效对气动性能的影响

Effect of circumferential displacement restrictor failure of fan/compressor stator on aerodynamic performance

以高负荷两级风扇为对象,采用数值模拟方法研究了静子周向限位失效对风扇气动性能的影响机理。比较分析了不同失效转速和不同失效级对其气动性能的影响程度,归纳总结了静子限位失效对压缩部件气动性能的影响规律。结果表明:静子周向限位失效将造成静子叶排产生一定的轮缘速度,影响自身的进出口气流角、流通能力和损失特性,以及级内和级间的匹配状态,导致压缩部件的流量减小,压比裕度降低,温升效率提高;此外还将改变压缩部件各级加功量的分配和流场特征的分布,导致级间原有的匹配失谐。静子周向限位失效的影响范围受上下游参数传递特征的限制,仅局限于上游相邻的转子叶排和下游转静子叶排。与前排静子限位失效相比,后排静子限位失效对风扇气动性能的影响程度相对较小。

The effect of circumferential displacement restrictor failure of stator on aerodynamic performance in two-stage high load fan was analyzed by CFD.The effect level of different stator rotating speeds and dif⁃ferent rotating stages were compared in order to find out the influence of stator displacement restrictor fail⁃ure on aerodynamic performance.Results show that the circumferential displacement restrictor failure of sta⁃tor would produce certain rim speed which will have some impact on inlet and outlet flow angle,flow capabil⁃ity,loss characteristics and matching condition between rotors and stators.As a result,mass flow of compres⁃sion components will decrease,compression margin will reduce and temperature rise efficiency will in⁃crease.The circumferential displacement restrictor failure of stator will change distribution of compression work and flow filed characteristics to cause mismatch between stages.Limiting by upstream and downstream transferring characteristics,the effect of circumferential displacement restrictor failure works on upstream adjacent blade rows and downstream blade and stator rows,The displacement failure on back stator rows will make less influence on fan/compressor aerodynamic performance comparing with failure on front row.