【摘要】 针对轴流风机性能仿真随着背压升高，仿真逐渐失真的问题，本文提出了一种基于机械被动增压原理的背压模拟器设计方法。结合流-固耦合仿真技术，研究了空调器用轴流风机在0～50Pa背压范围内的流场特性与结构响应。基于风机流-固耦合数值仿真得到的叶型热态变形数据，对叶片进行预变形设计，并与叶片预变形前轴流风机的气动性能进行比较。结果表明：采用背压模拟器可以有效降低高背压条件下的数值仿真误差，50Pa背压工况条件下轴流风机风量的数值预测误差降至3.5%。采用预变形设计的热态叶型相较于原型机冷态叶型的最大位移量为1.5mm，比原型机热态叶片的最大位移量减少了约60%。更多还原

【Abstract】 An investigation conducted to resolve the numerical simulation distortion on the aerodynamic performance of axial fan under high back-pressure conditions. In this study, a design method for a back pressure simulator based on the mechanical passive pressurization principle is proposed. The flow field characteristics and structural response of an axial fan used in the airconditioner within a back-pressure range of 0～50 Pa are studied by using the fluid solid coupling simulation technology. Based on the blade deformation data obtained from the numerical simulation, a pre-deformation design for the blade is performed, and the aerodynamic performance between the pre-deformed and original blades is compared and analyzed. The results show that the application of back-pressure simulator effectively reduces the numerical simulation errors under high back pressure conditions.When the back-pressure is 50 Pa, the relative error on the flow rate of axial flow fan is less than 3.5% in the numerical simulations.The maximum displacement of the pre-deformed blade is 1.5 mm compared to the cold state blade of prototype fan, representing a reduction of approximately 60% compared to the maximum displacement of the hot-state blade of prototype fan.更多还原