机匣处理改善轴流风扇驼峰特性的数值研究

发布时间：2018-12-11 03:06

【摘要】：针对轴流风扇性能曲线常出现的驼峰现象,采用数值的方法研究了机匣槽的布置方向与旋转轴间夹角的变化对性能的影响。结果表明:设计的几种开槽方案均能一定程度改善轴流风扇的性能,拓宽轴流风扇的稳定运行工况范围;机匣开槽可使得最高效率点向小流量方向偏移,而在偏大流量区域总压升和效率均有稍许下降;逆叶片轴向45°槽方案在全工况范围内的综合性能最优;前置周向槽可取得与整个布置周向槽相当的性能改善效果;合适的机匣处理可使得轴流风扇性能得到明显改善,其原因是高压流体会顺畅地从压力侧绕叶顶流向吸力面侧,将低能的流体旋涡及时地扫除吹向下游,从而有效地抑制叶片表面的流动分离和流道的堵塞效应,减少旋涡和二次流损失。
[Abstract]:In view of the hump phenomenon that often occurs in the axial fan performance curve, the influence of the arrangement direction of the casing slot and the angle between the rotating shafts on the performance is studied numerically. The results show that the slotted schemes can improve the performance of axial fan to a certain extent and widen the stable operating range of axial fan. The casing slotting can make the maximum efficiency point shift to the direction of small flow rate, while the total pressure rise and efficiency decrease slightly in the larger flow area, and the overall performance of the inverse blade axial 45 掳slot scheme is optimal in the whole working condition. The performance improvement effect of the front circumferential groove is equivalent to that of the whole arrangement circumferential groove. The performance of axial flow fan can be improved obviously by proper casing treatment. The reason is that the high pressure fluid flows smoothly from the pressure side around the top of the blade to the suction surface, and the low-energy fluid vortex is swept downstream in time. Thus, the flow separation on the blade surface and the blocking effect of the flow channel are effectively suppressed, and the vortex and secondary flow losses are reduced.
【作者单位】：上海理工大学能源与动力工程学院;上海市动力工程多相流动与传热重点实验室;
【基金】：国家自然科学基金资助项目(No.51576131,No.51536006) 上海市科委基地建设项目(No.13DZ2260900) 上海高校青年教师培养资助计划(No.ZZslg15009) 上海理工大学流动控制与仿真重点实验室资助(No.D15013)
【分类号】：TH432.1

【相似文献】