高来流马赫数单列叶栅改串列叶栅性能对比试验

Performance contrast experiment of prototype single cascade and redesign tandem cascade at high inlet Mach number

基于某高负荷轴流风扇高临界来流马赫数静叶改型设计的需求,对原型单列叶栅和改型串列叶栅开展性能对比试验研究,通过详细分析两型叶栅内部流场参数,量化评估了串列叶栅在高来流马赫数条件下的改进设计效果.结果表明:串列叶栅比单列叶栅在降低流动损失,提升增压能力方面具有显著优势.相比单列叶栅,设计状态下串列叶栅总压损失系数降低了19%,静压比提高了3.1%,基本缓解了单列叶栅原有设计状态的流动堵塞现象.串列叶栅前排叶片对后排叶片吸力面附面层发展会产生抑制作用,使得后排叶片具有较好的工作性能.

Based on the redesign requirement of stator blade with high critical inlet Mach number of a highly-loaded axial flow fan,the performance contrast experiment of prototype single cascade and redesign tandem cascade was presented.The improvement effect of tandem cascade at high inlet Mach number was also evaluated by analyzing the internal flow field parameters of both types of cascade.Results show that the tandem cascade has significant advantages in reducing flow loss and increasing compression capacity than the single cascade.Compared with the single cascade,the total pressure loss coefficient and the static pressureratio of the tandem cascade reduced by 19% and enhanced by 3.1%,respectively.Accordingly,the flow blockage phenomena of the single cascade at original design condition are eased basically.The front blade can restrain the boundary layer development on suction surface of the rear blade of the tandem cascade,thus the rear blade has good operating performance.