Based on electrical capacitance tomography technique, a novel method for flow pattern display and voidage measurement of two-phase flow was proposed. A 12-electrode ECT measurement system was developed. The weighted b...Based on electrical capacitance tomography technique, a novel method for flow pattern display and voidage measurement of two-phase flow was proposed. A 12-electrode ECT measurement system was developed. The weighted back projection algorithm was selected as the image reconstruction algorithm to satisfy the requirement of flow pattern display. Combining the principle of Tikhnov regularization theory with the ART(Algebraic Reconstruction Technique) algorithm, a new quantitative image reconstruction algorithm was developed to implement voidage measurement of two-phase flow. Experimental results of gas-liqiud two-phase flow and gas-solid fluidized bed showed that the developed measurement system was successful. The speed of image reconstruction of flow pattern display was greater than 20 frames per second. The maximum error of voidage measurement is less than 5% and the time of voidage measurement is less than 2 seconds.展开更多
为保证电容层析成像(ECT)系统满足航空航天领域多相流参数测试的要求,开发了一套基于CPCI工业总线标准的ECT系统。采用高性能现场可编程门阵列(FPGA)芯片作为主控芯片,实现信号激励模块、多路复用开关模块、数据处理模块、数据解调和传...为保证电容层析成像(ECT)系统满足航空航天领域多相流参数测试的要求,开发了一套基于CPCI工业总线标准的ECT系统。采用高性能现场可编程门阵列(FPGA)芯片作为主控芯片,实现信号激励模块、多路复用开关模块、数据处理模块、数据解调和传输模块的集成式设计,将采集信号进行预处理,实现信号的滤波、放大和相敏解调,并通过CPCI工业总线接口把解调后的电容数据传送至系统上位机,完成图像重建。实验测试结果表明:系统采用1 MHz激励信号和8电极传感器的工作模式下,采用10周期的测试信号解调时,图像采集速度可达1 785幅/s,信号的信噪比高于60 d B,成像结果具有良好的空间分辨率。展开更多
基金国家自然科学基金青年基金 (No .2 970 6 0 0 8)国家自然科学基金重大项目 (No .5 9995 46 0 -5 )资助项目~~
文摘Based on electrical capacitance tomography technique, a novel method for flow pattern display and voidage measurement of two-phase flow was proposed. A 12-electrode ECT measurement system was developed. The weighted back projection algorithm was selected as the image reconstruction algorithm to satisfy the requirement of flow pattern display. Combining the principle of Tikhnov regularization theory with the ART(Algebraic Reconstruction Technique) algorithm, a new quantitative image reconstruction algorithm was developed to implement voidage measurement of two-phase flow. Experimental results of gas-liqiud two-phase flow and gas-solid fluidized bed showed that the developed measurement system was successful. The speed of image reconstruction of flow pattern display was greater than 20 frames per second. The maximum error of voidage measurement is less than 5% and the time of voidage measurement is less than 2 seconds.
文摘为保证电容层析成像(ECT)系统满足航空航天领域多相流参数测试的要求,开发了一套基于CPCI工业总线标准的ECT系统。采用高性能现场可编程门阵列(FPGA)芯片作为主控芯片,实现信号激励模块、多路复用开关模块、数据处理模块、数据解调和传输模块的集成式设计,将采集信号进行预处理,实现信号的滤波、放大和相敏解调,并通过CPCI工业总线接口把解调后的电容数据传送至系统上位机,完成图像重建。实验测试结果表明:系统采用1 MHz激励信号和8电极传感器的工作模式下,采用10周期的测试信号解调时,图像采集速度可达1 785幅/s,信号的信噪比高于60 d B,成像结果具有良好的空间分辨率。
