流固耦合传热对蒸汽湿度测量传感器的影响

Influence of Coupled Fluid-Solid Heat Transfer on the Sensor of Steam Wetness Measurement

采用流固耦合法,分析计算了不同蒸汽参数及流速条件下谐振腔内的温度分布;加载温度载荷,计算了不同条件下谐振腔体的热变形量;根据谐振腔体有效部分内表面节点热变形量的平均值,分析了谐振腔体节点热变形对谐振频率的影响.结果表明:随着蒸汽温度升高和流速增大,谐振腔体温度升高,热变形量增大,谐振频率偏移量增大.应从谐振腔的材料、结构设计及蒸汽湿度测量方案等方面进行改进,以降低谐振腔体节点热变形对蒸汽湿度测量的影响.

The temperature field and thermal deformation of resonant cavity were calculated using coupled fluid-solid analysis under different steam parameters and flow velocities,while the influence of cavity thermal deformation on the resonant frequency was analyzed according to the average value of node deformation on the effective cavity surface.Results show that with the rise of steam temperature and flow velocity,the average temperature and thermal deformation of resonant cavity,and the offset value of resonant frequency increase.The effect of cavity thermal deformation on the wetness measurement may be reduced by improving the material and structure of the resonant cavity and the specific measurement way.