流动湿蒸汽湿度测量微波谐振腔结构分析

Study on structure of microwave resonant cavity for wetness measurement of flowing wet steam

在建立汽液两相流数值模型基础上,对微波谐振腔进行了气动和两相流取样分析,设计了一种带楔形取样前段具有圆环网栅端面的圆柱形谐振腔。通过结果分析,定量计算了取样误差,给出了测量结果的修正公式。另外还计算了典型工况下谐振腔的干扰长度,这对腔体在现场的安装运行具有一定的指导意义。最后对谐振腔进行了电磁分析,腔体结构满足电磁特性。表明该谐振腔具有流动湿蒸汽湿度测量的合适结构。

Based on a vapour-liqiud two-phase flow model, the pneumatic performance and two-phase sampling are analyzed. A column resonant cavity with wedge sampling segment and end faces with annular grid is designed. The sampling error is calculated. The modified formula is presented. The interference length of the resonant cavity in the typical work condition is calculated. The cavity is electromagnetically analyzed. The result shows that the cavity structure suits the electromagnetic performance, and the resonant cavity suits to measure wetness of flowing wet steam.