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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第3期    总第259期    2016年3月

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文章编号:1672-7207(2016)03-1044-05
浓度对光脉动法气固两相流颗粒粒径测量的影响
杨斌,何渊,周骛,姜勇俊,蔡小舒

(上海理工大学颗粒与两相流测量研究所,上海市动力工程多相流动与传热重点实验室,
上海,200093
)

摘 要: 针对工业应用中气固两相流浓度对光脉动(LTF)颗粒粒径测量方法的影响问题,通过对比浓度基本不变及浓度时刻变化的光脉动频谱特征,分析确定因浓度变化造成影响的阈值频率,由此提出高通滤波光脉动法颗粒粒径优化算法,并将该算法用于浓度时刻变化的光脉动法数据处理中。研究结果表明:优化算法结果与激光粒度仪离线测量结果相对偏差改进到12%内,且标准差降低为11.3 μm,由此验证了该算法可有效减小浓度对光脉动法测量结果的影响,提高测量结果的准确性和稳定性。

 

关键词: 气固两相流;在线测量方法;光脉动法;颗粒粒径;浓度影响

Concentration influence on light transmission fluctuation method for particle size measurement of gas-solid two-phase flow
YANG Bin, HE Yuan, ZHOU Wu, JIANG Yongjun, CAI Xiaoshu

Institute of Particle and Two-phase Flow Measurement, Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

Abstract:For the influence on the light transmission fluctuation (LTF) method of particle concentration for the particle size measurement in industrial applications, the frequency spectrum characteristics were analyzed by comparing the steady particle concentration condition with the unsteady condition, and the threshold frequency caused by unsteady concentration was obtained. Thus, the high-pass filtering optimum algorithm of LTF was presented for particle size calculation. The results show that the relative deviation between optimum algorithm and original algorithm is improved within 12%, and the standard deviation is reduced to 11.3 μm. The influence on LTF of particle concentration can be decreased by the optimum algorithm effectively, and the accuracy and reliability of measurements are improved respectively.

 

Key words: gas-solid two-phase flow; in-line measurement; light transmission fluctuation method; particle size; concentration influence

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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