摘要
利用互相关法测速无需正确测量信号绝对值的优点，研制了应用电子微压计提取高温烟气 压力脉动信号的水冷三维取压探针，及相关法三维高温烟气流速测量装置．实验室台架测试， 在烟气温度５００℃～８００℃，流速１０．２２ ｍ／ｓ～２０．４９ ｍ／ｓ范围，速度相对误差在４．２６％～８．６１％ 之间，方向相对误差为－１．７９％～３．４７％，有较高的精确度．是实现炉内高温烟气速度场准连续 测量的好方法．
The diffculty in three-dimensional velocities of high-temperature ashy and pulsated dramatically flue gases in boiler hinders the rapid improvement of boiler combustion study. The correlation velocity technique makes use of random flowing noise signals of fluid to derive the flowing velocity of fluid, which is applicable to adverse and noise environment measurements. The study'is based on the successful measurements of one-dimensional high-temperature flue gas flowing velocity. In addition, the correlation method does not involve precise measurements of absolute signals. Taking this advantage, we introduce in this paper a three-dimensional water cooled pressure sensitive probe to sample the pressure pulsation in high-temperature flue gas, which are recorded by an electrical pressure meter EMP-6A. In this experimental apparatus, a computer is used to acquire the digital noise signal, and at the same time, digital filtering and cross-correlation calculation are carried out to derive the magnitude and direction of the flowing velocity of flue gas. The time consumed on every measurement is less than 10 seconds. The temperatures of flue gases are between 500℃～800℃, the velocities are between 10.22～20.49 m/s. Calculations indicate that the relative errors of velocity magnitudes are fallen within 4.26%～8.61% ) the relative errors of velocity directions are fallen within -1.79%～3.47%. The fairly high precision proves that this technique is a good on-line measurement method for high-temperature flue gas in boiler.
出处
《力学学报》
EI
CSCD
北大核心
2001年第3期403-406,共4页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金资助项目(59576030).
关键词
三维速度
互相关法
相关流速测量
高温烟气
锅炉
压力脉冲信号
D-velocity, cross correlation method, correlation velocity measurement, high-temperature flue gas, boiler
