Development of high accurate transient now rate measurement using pulse Ultrasound

使用脉冲超声波进行高精度瞬态电流测量的开发

• 批准号: 12558055
• 负责人: KIKURA Hiroshige
• 金额: $ 7.3万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12558055/
• 关键词: Fluid mechanics; Flow rate measurement; Multi-line measurement; Pulse ultrasound; Ultrasonic time domain correlation method; Doppler effect; Fully developed flow; 超音波キャビテーション; 乱流; 強力超音波; キャビテーション

Pulse Ultrasonic Doppler method for accurate flow metering system has been developed. The principle of this method is based on the integration of instantaneous velocity profile over a pipe diameter so that it is expected to be able to eliminate installation problems such as entry length as well as to follow transient flow rate precisely. Therefore, in the present study, we report the results of multiline flow rate measurement employing this method. Flow metering principle by ultrasonic Doppler method in a circular pipe depends on the alignment of measuring lines. In most cases, metallic pipes are used at power plants. And some reflectors are needed to seed the water for now rate measurement using this method. Because clear water flows in the pipes at power plants. In this study, the comparison among several kinds of metallic pipes on the flow rate measurements have been investigated in a vertical pipe. Additionally, for reflectors ultrasonic cavitation bubbles were applied and the effe … More ct was compared with nylon powder, which used in the previous study. In this experiment, even for the metallic wall pipe, it is possible to measure the flow rate using multiline system with high accuracy. And for the ultrasonic reflector cavitation bubbles are achievable to be applied. As mentioned above, it is indicated that the present multiline flow metering system by using ultrasonic Doppler method has very high accuracy. And this method can be considered as a multipurpose system, because the flow rate can be measured under non-Ideal flow conditions such as non-developed flow or non-axisymmetric flow.In the present study, a new velocity profile measurement technique using a ultrasound time-domain correlate ion method(UTDC) has been developed. The system is based on the cross-correlation between two consecutive echoes of ultrasonic pulses to detect the velocity. The UTDC has two advantages over the conventional ultrasound pulse Doppler method. First, the system has a better time resolution than the pulse Doppler method. Second, the system have no limitation in maximum measurable velocity, which is limited by Nyquist's sampling theorem. In this study, the velocity profile measurement using the UTDC is performed, and the velocity profiles measured by the UTDC method is good agreement with those results using the pulse Doppler method. Less

研制了脉冲超声多普勒法精确流量测量系统。这种方法的原理是基于管道直径上的瞬时速度分布的积分，因此它有望能够消除诸如入口长度等安装问题，并能够精确地跟踪瞬时流量。因此，在本研究中，我们报告了使用该方法进行多线流量测量的结果。圆管超声多普勒法流量测量原理依赖于测量线的对准。在大多数情况下，发电厂使用金属管。目前使用这种方法进行速率测量时，需要一些反射镜来播撒水分。因为发电厂的管道里流淌着清水。在本研究中，比较了几种金属管在垂直管道中的流量测量。此外，对于反射器，应用了超声空化气泡和Effe…与以前研究中使用的尼龙粉相比，ct更高。在本实验中，即使对于金属壁管，也可以使用多路系统高精度地测量流量。对于超声反射器，可以实现空化气泡的应用。结果表明，目前采用超声多普勒法的多线流量计量系统具有很高的精度。由于该方法可以在非理想流动条件下(如非发展流或非轴对称流动)进行流速测量，因此可以看作是一种多用途系统。该系统是基于两个连续的超声脉冲回波之间的互相关来检测速度的。与传统的超声脉冲多普勒法相比，UTDC有两个优点。首先，该系统比脉冲多普勒法具有更好的时间分辨率。其次，该系统对最大可测速度没有限制，这是由奈奎斯特采样定理所限制的。在本研究中，利用UTDC进行了速度剖面的测量，用UTDC方法测得的速度剖面与用脉冲多普勒法测得的速度剖面符合得很好。较少

项目成果

Taishi, T., Kikura, H., Aritomi, M.: "Effect of Control Volume of UVP Method on the Turbulent Pipe Flow Measurement"Experiments in Fluids. 32-2. 188-196 (2002)

Taishi, T.、Kikura, H.、Aritomi, M.：“UVP 方法控制体积对湍流管流测量的影响”流体实验。

Kikura, H., Wada, S., Aritomi, M., Mori, M., Takeda, Y.: "Development of Pulse Ultrasonic Doppler Method for Flow Rate Measurement of Power Plant (Multiline Flow Rate Measurement for Non Developed Flow)"10th International Conference on Nuclear Engineering

Kikura, H.、Wada, S.、Aritomi, M.、Mori, M.、Takeda, Y.：“发电厂流量测量脉冲超声波多普勒方法的开发（非展开流量的多线流量测量）”

Taishi, T., Kikura, H. and Aritomi, M.: "Effect of Control Volume of UVP Method on the Turbulent Pipe Flow Measurement"Experiments in Fluids. 32-2. 188-196 (2002)

Taishi, T.、Kikura, H. 和 Aritomi, M.：“UVP 方法控制体积对湍流管流测量的影响”流体实验。

Taishi, T., Kikura, H., Koike, Y., Aritomi, M., Mori, M.: "Applicability of Ultrasonic Cavitations Bubbles for Measurement of Ultrasonic Doppler Method"3rd International Symposium on Ultrasonic Doppler Methods for Fluid Mechanics and Fluid Engineering, La

Taishi, T.、Kikura, H.、Koike, Y.、Aritomi, M.、Mori, M.：“超声空化气泡在超声多普勒方法测量中的应用”第三届流体力学和流体超声多普勒方法国际研讨会

Yamanaka, G., Kikura, H., Aritomi, M.: "Velocity profile measurement by ultrasound time-domain correlation method"5th World Conference on Experimental Heat Transfer. 1189-1193 (2001)

Yamanaka, G.、Kikura, H.、Aritomi, M.：“超声时域相关法的速度分布测量”第五届世界实验传热会议。