开口条件下高速离心机机室流场模拟及试验研究

Simulations and tests on characteristics of flow field of high-speed centrifuge chamber with inlet and outlet

为研究离心机机室开口条件下机室内流场特性及开口对风阻功率的影响,首先基于CFD(计算流体力学)方法建立了某离心机机室流场分析模型,针对机室开口状态进行了模拟,对比了风口竖直及倾斜对换热的影响;其次在某高速离心机上开展了流场测试试验,获得了机室内压力及风速的空间分布,及随离心机转速的变化规律,并对比了圆盘转子与转臂转子的风阻功率差异。研究表明滑移网格技术可用于计算离心机机室内旋转流场,倾斜通风口更有利于机室通风换热,并降低离心机运行的风阻功率;对旋转部件上凹坑等进行整流可有效降低风阻功率;圆盘转子的压差阻力远小于转臂转子。通过合理设计通风口可提高机室换热效率,研究可为高速离心机机室及温控设计提供参考。

To investigate the characteristics of flow field in centrifuge chamber with opening and the effect of opening on wind resistance power,firstly,based on the computational fluid dynamics method,the model for the flow field of a centrifuge chamber is established,and the opening state of the chamber is simulated.Secondly,the tests on the flow field are carried out on a high-speed centrifuge,and the spatial distribution of the pressure and wind speed in the centrifuge room,as well as the change rules with the centrifuge speed,is obtained.The difference of the wind resistance power between the disc rotor and the rotor arm is compared.The results show that the sliding grid technology can be used to calculate the rotating flow field in the centrifuge chamber and the inclined vent is more conducive to the ventilation and heat transfer of the chamber,and reduces the wind resistance power of the centrifuge operation.The rectification of pits on rotating parts can effectively reduce the wind resistance power.The differential pressure resistance of the disc rotor is far less than that of the rotary arm rotor.The heat transfer efficiency of the machine room can be improved by reasonably designing the vent,and the research can provide reference for the design of the machine room and temperature control of the high-speed centrifuge.