Analysis of Non-isokinetic Sampling Deviation for Measurement of Steam Humidity in Microwave Cavities

Journal of Chinese Society of Power Engineering ›› 2012, Vol. 32 ›› Issue (5) : 383-387.

Automatical Controlling and Detecting Diagnosis

HAN Zhong-he, ZHANG Mei-feng, QIAN Jiang-bo

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Abstract

To accurately calculate the sampling deviation of microwave cavity, the non-isokinetic sampling principle was analysed, based on which measurement errors of wetness due to sampling deviation were obtained by computing the trajectory of droplets in two sampling ends of different structures through Lagrangian method under different conditions and droplet sizes. Results show that sampling deviation is less affected by the droplet size at low Mach number, while an obviously close relation with it has been seen as well as working conditions at high Mach number. It is found that optimizing the sampling end of the cavity can effectively reduce the measurement error. Since the Mach number of steam turbine exhaust is relatively low in power plant, therefore higher precision of sampling may be reached for measurement of steam humidity in microwave cavity via appropriate correction of sampling errors.

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wet steam / sampling deviation / steam humidity measurement / non-isokinetic sampling / microwave cavity

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HAN Zhong-he, ZHANG Mei-feng, QIAN Jiang-bo. Analysis of Non-isokinetic Sampling Deviation for Measurement of Steam Humidity in Microwave Cavities. Journal of Chinese Society of Power Engineering. 2012, 32(5): 383-387

References

[1] 韩中合,杨昆. 汽轮机中蒸汽湿度测量方法的研究现状[J]. 华北电力大学学报,2002,29(4): 44-47.
HAN Zhonghe, YANG Kun. Reviews on wetness measurement methods of wet steam in turbine[J]. Journal of North China Electric Power University, 2002, 29(4): 44-47.
[2] 韩中合,张淑娥,田松峰,等. 汽轮机排汽湿度谐振腔微扰测量法的研究[J]. 中国电机工程学报,2004,23(12): 199-202.
HAN Zhonghe, ZHANG Shue, TIAN Songfeng, et al. Study on a method of wetness measurement based on resonant cavity perturbation for steam turbine exhaust[J]. Proceedings of the CSEE, 2004, 23(12):199-202.
[3] 王升龙,杨善让,王建国,等. 汽轮机排汽湿度的在线监测方法及工业试验研究[J]. 中国电机工程学报,2005,25(17): 83-87.
WANG Shenglong, YANG Shanrang, WANG Jianguo, et al. Study on a method of wetness measurement on line and industrial test for steam turbine exhaust[J]. Proceedings of the CSEE, 2005, 25(17): 83-87.
[4] 黄雪峰,盛德仁,陈坚红,等. 湿蒸汽两相流湿度测量方法研究进展[J]. 电站系统工程,2006,22(5):1-4.
HUANG Xuefeng, SHENG Deren, CHEN Jianhong, et al. Development study on measuring moisture of the wet steam two phase flow[J]. Power System Engineering, 2006,22(5):1-4.
[5] 韩中合,钱江波,杨昆,等. 谐振腔微扰法测量汽轮机排汽湿度技术的关键问题[J]. 动力工程,2005,25(3): 387-391.
HAN Zhonghe, QIAN Jiangbo, YANG Kun, et al. Key problems of steam turbine exhaust wetness measurements by the resonant cavity perturbation method[J]. Journal of Power Engineering, 2005,25(3): 387-391.
[6] 韩中合,杨昆,田松峰,等.在线监测透平油中微水含量的谐振腔微扰测量法[J]. 汽轮机技术,2003,45(5): 273-275.
HAN Zhonghe, YANG Kun, TIAN Songfeng, et al. Study on the method of on-line measurement of water content in the turbine oil based on resonant cavity perturbation[J].Turbine Technology, 2003,45(5): 273-275.
[7] 田松峰,韩中合,杨昆. 流动湿蒸汽湿度谐振腔微扰法测量的实验研究[J]. 动力工程,2005,25(2): 254-257.
TIAN Songfeng, HAN Zhonghe, YANG Kun. Experimental research on wetness measurement of flowing steam by resonant cavity perturbation[J]. Journal of Power Engineering, 2005,25(2): 254-257.

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2011-10-17	2012-05-15
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2012-05-15

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