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| Numerical simulation of multi-physics coupling for the thermal deformation of precision centrifuge |
| LU Yan1, WANG Jue2, LING Ming-xiang2, DU Ping-an1 |
1. School of Mechatronics Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China;
2. Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621900, China |
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Abstract Centrifuge is a calibrating device of accelerometer in inertial navigation system,and deformation of the rotator could seriously affect the calibrating accuracy.The centrifuge indoor air flow,heat transfer and heat conduction of cabinet and rotator were considered when the thermal deformation was analyzed through a multi-field coupling simulation,which combined the methods of CFD and FEM.The multi-physics coupling calculation principles were analyzed.Temperature field was calculated by using conjugate heat transfer method,and thermal deformation was obtained by the sequential coupling method.The results showed that at speed of 300 r/min,the maximum temperature rise was 1.23 ℃,and the farther away from the rotator center,the bigger temperature rise.The calculated temperature at the location for mounting accelerometer was consistent with the measured value.The radial deformation of the accelerometer location was 7.89 μm.Thermal deformation is a result of accumulated deformation,and increases with the rotating speed.
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Received: 30 June 2015
Published: 28 February 2016
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精密离心机热变形多物理场耦合数值计算
离心机是惯性导航系统加速度计的标定设备,转盘变形将严重影响标定精度.综合考虑离心机机室内空气流动、流动传热以及机箱和转盘的导热,结合CFD和FEM方法,对精密离心机的热变形进行流-热-固多场耦合计算.分析了多物理场耦合计算原理,采用流固耦合换热整场求解法计算离心机温度场,采用顺序耦合法计算转盘热变形.计算结果表明:在300 r/min转速下,转盘最大温升为1.23 ℃;越远离转盘中心,温升越大;加速度计安装位置的温度计算值与实测值一致,验证了本方法的正确性;转盘安装加速度计位置的径向热变形为7.89 μm,热变形是变形累积的结果且随着转盘转速增加而增大.
关键词：
精密离心机,
多物理场耦合,
流固耦合换热,
温度场,
热变形
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