摘要
为提高大流量离心风机的气动性能,运用计算流体动力学研究了加强盘位置及叶轮型式对叶轮结构强度、风机性能及压力脉动的影响。结果表明:加强盘居中时风机设计点效率与原型机相比提升3.9%,叶轮最大总变形量减小56.5%,蜗壳流域压力脉动降低5.4%;表面加强盘居中有利于增强叶轮结构强度,提升风机气动性能并降低蜗壳流域压力脉动;采用交错叶片能降低70%以上蜗壳流域压力脉动,有利于风机离散噪声控制;受高低能流体掺混产生的湍动能耗散影响,交错叶片型风机气动损失增加,且叶道内压力脉动幅值增大。加强盘居中和采用交错叶片是提高大流量离心风机气动性能和降低离散噪声的有效方法,但需注意其对气动损失的影响。研究结果可为大流量风机加强盘设计提供理论依据。
In order to improve the aerodynamic performance of a large flow centrifugal fan,the influences of the position of the reinforcing disc and the type of the impeller on the structural strength of the impeller,fan performance and pressure fluctuation were studied by using computational fluid dynamics.The results show that compared with the prototype,when the reinforcing disc is centered,the design point efficiency of the fan is increased by 3.9%,the maximum total deformation of the impeller is reduced by 56.5%,and the pressure pulsation of the volute flow domain is reduced by 5.4%.The center installation of the reinforcing disc is beneficial to enhance the structural strength of the impeller,improve the aerodynamic performance of the fan and reduce the pressure pulsation of the volute flow domain.The use of staggered blades can reduce the pressure pulsation of the volute flow domain by more than 70%,which is conducive to the discrete noise control of the fan.However,due to the influence of turbulent kinetic energy dissipation produced by mixing of low and high energy fluid,the aerodynamic loss of the fan with staggered blades is increased,and the amplitude of pressure pulsation in the blade passage is larger.The center installation of the reinforcing disc and use of staggered blades are effective ways to improve the aerodynamic performance of high flow centrifugal fans and reduce discrete noise,but the effect of them on aerodynamic losses needs to be noted.The results of the study can provide a theoretical basis for the design of reinforcing disc for large flow fans.
作者
侯佳鑫
王艺
刘文钢
谢军龙
曾旺
HOU Jiaxin;WANG Yi;LIU Wengang;XIE Junlong;ZENG Wang(School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Nantong-Dart-Rich fan Co.,Ltd.,Nantong 226000,China)
出处
《流体机械》
CSCD
北大核心
2023年第8期49-55,86,共8页
Fluid Machinery
基金
国家自然科学基金项目(522760091)。
关键词
离心风机
加强盘
交错叶片
压力脉动
结构强度
centrifugal fan
reinforcing disc
staggered blade
pressure pulsation
structural strength
