The temperature field of resonant cavity was calculated using coupled fluid-solid analysis under different measuring time and Mach number,while the influence of cavity thermal deformation on the resonant frequency and measurement of humidity.The results showed that the temperature of resonant cavity changes slowly and largely during the measurement.The temperature is gradually increased with increasing Mach number,when Ma is 0.5,the temperature will be up to 10℃.The temperature difference is more than 1℃ between the measurement and non-measurement state and it needs to wait for more than 600s until the temperature is stable when switching the measurement state before measuring the steam wetness.As the Mach number increases,the frequency deviation increases gradually up to 105Hz and the humidity deviation is up to about 16%.%采用流固耦合法,分析计算了不同马赫数下,谐振腔在整个测量过程中的温度分布,进而分析了温度变化引起的热变形对谐振频率和湿度测量的影响.结果表明:在测量过程中,谐振腔温度发生缓慢且较大的变化,随着马赫数的增加,温升逐渐增大,当Ma=0.5时,温升可达10℃以上,测量与非测量状态之间的温差达到1℃以上,且在两者之间切换时,需等待600s以上,直至腔体温度稳定后,再进行湿度测量;随着马赫数的增加,频率偏差逐渐增大,可达105Hz,引起的湿度偏差最大为16%左右.
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