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为了准确计算微波谐振腔的取样误差,分析了非等动能取样原理,针对2种不同的取样端,采用拉格朗日方法计算水滴运动轨迹,得到了不同工况和水滴尺寸下由于取样偏差导致的湿度测量误差.结果表明:当马赫数较小时,取样误差受水滴尺寸影响较小;而马赫数较大时,取样误差不仅与水滴尺寸密切相关,而且明显受工况的影响;通过优化谐振腔的取样端结构,可以有效减小由于取样产生的测量误差;由于电厂汽轮机排汽马赫数较小,通过取样修正,微波谐振腔可以达到较高的取样精度.
In order to accurately calculate the sampling error of the microwave cavity, the principle of non-isokinetic sampling was analyzed. For two different sampling points, the Lagrange method was used to calculate the trajectory of the water droplet. The sampling error was obtained under different conditions and droplet sizes The results show that when the Mach number is small, the sampling error is less affected by the droplet size. When the Mach number is larger, the sampling error is not only closely related to the droplet size, but also obviously affected by the working conditions. By optimizing the resonance The sampling end structure of the cavity can effectively reduce the measurement error caused by the sampling. Due to the small Mach number of the steam turbine exhaust of the power plant, the microwave resonant cavity can achieve higher sampling precision by sampling correction.