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热力发电  2015 

用于液膜厚度测量的开式同轴腔传感器结构设计

, PP. 99-103

Keywords: 汽轮机,液膜厚度,同轴谐振腔传感器,开放式,测量关系式

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Abstract:

汽轮机低压缸的湿蒸汽区液膜在高速汽流拖拽撕裂下形成较大水滴,会造成动叶片的严重水蚀,实时监测液膜厚度对于叶片防护及机组的安全运行具有重要意义。对此,搭建了谐振腔等效电路,并推导液膜厚度的测量关系式,设计了电磁性能良好的开式同轴谐振腔传感器,仿真分析了同轴腔的谐振频率随水膜厚度的变化关系,确定了测量关系式中的待定系数;选择蒸馏水为液膜材料,介电常数为81,利用电磁仿真软件hfss计算水膜厚度h从0变化到1mm,单位增加0.02mm时进行拟合仿真,结果表明:拟合相似度0.995,均方根误差0.022。可见,该测量关系式可靠性较高,该测量技术可用于测量汽轮机静叶片、汽缸壁、导流环等结构处的液膜厚度。

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