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以跨声速风扇为研究对象,采用全周三维非定常数值模拟方法研究静叶根部20°正弯对总压畸变条件下风扇性能和流场结构的影响。通过对设计转速下风扇全工况进行求解,对比分析了静叶采用直叶片和弯叶片时设计点和近失速点的风扇性能和流场结构。通过与均匀进口条件的风扇性能对比,探讨弯叶片对风扇效率、稳定边界以及抗畸变能力的影响,重点研究弯叶片对动静叶流动损失的影响以及对级性能的影响和改善机理。研究表明,均匀进口时,根部20°正弯静叶可以改善风扇在近失速点附近的性能,而在设计点附近,弯叶片的作用不明显;进口总压畸变条件下,静叶根弯20°能有效改善风扇性能,提高稳定性;静叶根弯对流场的影响取决于具体的流场结构,流动状态越恶劣,弯叶片的作用越明显。
Taking the transonic fan as the research object, the full three-dimensional unsteady numerical simulation method was used to study the influence of the 20 ° positive bend of the static blade root on the fan performance and the flow field structure under the total pressure distortion. By analyzing the full fan operating conditions at design speed, the fan performance and flow field structure at the design point and the stalling point when the vane is used with straight vane and curved vane are comparatively analyzed. By comparing with fan performance under uniform inlet conditions, the influence of curved vanes on fan efficiency, stability boundary and anti-distortion is discussed. The effects of curved vanes on the flow losses of moving vanes and static vanes and the improvement of mechanism are also discussed. The results show that, at uniform inlet, the 20 ° positive cambered leaves at the root can improve the performance of the fan near the stall point, but the effect of curved leaves is not obvious near the design point. Under the condition of total pressure distortion, ° can effectively improve fan performance and improve stability. The influence of stator root bending on the flow field depends on the specific structure of the flow field, and the worse the flow state, the more obvious the role of curved blades.