【摘要】 集流器是轴流风机的主要部件之一，对轴流风机运行性能产生较大的影响。为此，针对农用轴流风机集流器普遍存在结构设计不合理、能耗高、风量损失多的问题，以典型的24英寸负压玻璃钢风机为研究对象，采用风室试验、逆向建模和CFD数值模拟相结合的方式，依托单因素分析和响应面分析的方法，研究集流器的进口段长度L、圆角半径R、出口直径D对风机性能和流场的影响。结果表明：对集流器参数进行无量纲处理后，集流器各参数适宜的取值区间为：1.00≤E_L≤1.46、2.95≤E_R≤3.22、0.989 8≤E_D≤0.997 1;经过响应面模型得出各影响因素对风机性能的影响，当L=149.27 mm、R=321.68 mm、D=678.00 mm时风机性能较优。经数值模拟验证，相比原型风机，优化后通风量Q提高5.86%,能效比N提高6.79%,此时通风量Q为9 900.54 m~3/h,能效比N为20.03 m~3/(h·W)。本研究为此类农用轴流风机集流器提高通风量及能效比提供了参数优化方法。更多还原

【Abstract】 The collector is one of the main components of the axial flow fan, which has a great influence on the fan performance. However, the problems of unreasonable structure design, high energy consumption and air volume loss are common in the collectors of agricultural axial flow fans. Effects of the inlet length（L）, fillet radius（R）, and the outlet diameter（D） of the collector on the fan performance and flow field were studied, taking a typical 24-inch negative pressure FRP axial flow fan as the research object, using wind tunnel tests and CFD simulations. Besides, single factor analysis and response surface analysis were used in this process. The results showed that the suitable ranges of the dimensionless parameters of the collector were 1.00≤E_L≤1.46, 2.95≤E_R≤3.22, 0.989 8≤E_D≤0.997 1. The effects of each influencing factor on the performance of the fan were obtained through the response surface model. When L=149.27 mm, R=321.68 mm, and D=678.00 mm, the fan performance can be achieved better, the optimized Q was increased by 7.58% and N was increased by 8.07% compared with the prototype fan, the Q=10 061.45 m³/h, N=20.24 m³/（h·W）. The numerical simulation indicated that the optimized Q was increased by 5.86% and N was increased by 6.79% compared with the prototype fan, the Q=9 900.54 m³/h, N=20.03 m³/（h·W）. The optimized collector can significantly increase the positive vortex value in agricultural axial fan shroud, the maximum positive vortex of the leaf top clearance was 2 197.21 s^-1, and its distribution area was increased in agricultural axial fan hub and shroud. The research result can provide a parameter optimization method to improve the airflow and energy efficiency ratio for agricultural axial fan collectors.更多还原