摘要
基于电容层析成像(ECT)传感器和模式识别理论,提出了一种新型的气液两相流空隙率测量方法。根据流型几何特征分别建立了空隙率的三个模板库。测量时先对流型进行分类,再调用对应的模板库利用距离测度进行模板匹配,从而得到空隙率。实验结果表明该方法是可行的,有助于克服测量结果易受流型影响的问题,同时速度优于传统ECT技术方法,获得一个管截面空隙率值所花费的测量时间小于50ms,最大测量误差可小于5%,满足工业在线运行需要。
Based on electrical capacitance tomography (ECT)sensor and pattern recognition theory, a new method was proposed for voidage measurement of gas-liquid two-phase flow. One of three template databases was selected by flow regime classification using geometry characteristic of different flow regimes. The voidage was obtained by template matching. Test results showed that the method is effective. The advantages of this method are that the measurement results aren't affected by flow regime and the speed is faster than the conventional voidage measurement method by reconstructed ECT image. The time cost of one voidage measurement result is less than 50 ms and the maximum error of measurement is less than 5%, which satisfy the requirements of the industrial online operation.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2005年第6期557-561,共5页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金(59995460-5)
国家863计划专项经费(2001AA413210)
浙江省自然科学基金(600094)资助项目
关键词
电容
模式识别
空隙率
两相流
测量
Capacitance Pattern recognition Voidage Two-phase flow Measurement
