Real-time Diagnosis of Flow by Using Pressure Wave

利用压力波实时诊断流量

• 批准号: 01460112
• 负责人: MIYAKE Yutaka
• 金额: $ 4.29万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01460112/
• 关键词: Pressure Wave; Electric Discharge in Water; Flow Diagnosis; Identification; Inverse Problem; Boundary Element Method; Wave Equation; 音波; 堺界要素法; 同定問題; 実時間診断; パルス波; 逆解析; キャビテ-ション同定; 異物同定

The puropose of the present research is to defvelop a flow diagnosis method on the basis of the numerical calculation on the computer. The flow diagnosis means detecting and identifying obstacles or cavities included in the flow field of pipes or fluid machines. At first, basic research wag performed for* a simple-shaped closed tank filled with water before general flow passage is treated. A small electric discharge with high energy was generated in two kinds of rectangular tanks, i. e., one made of acrylic resin and the etlier made of brass, and impulsive pressure wave was generated by sudden generation of a bubble due to the discliarge. Stable generation of the bubble, correct synchronization of a discharge circuit and a sensing circuit, receiving of signal having very high frequency, and high speed data access to the computer using A/D converter were achieved and highly accurate measurement of flow was possible. According to the results calculated from the data, it was shown that a one-dimensional method gives a satisfactory solution for an obstacle of simple shape (e. g., sphere). Although the actual shape of pressure wave front is unsteady and complex, the one-dimensional geometric - acoustics gives a solution with high accuracy if the wave fronts are considered of passing through, refracting on and diffracting around the obstacle body. However, in calculating the reflection wave from the wall boundar the one - dimensional solution was not adequate but, the reflection property due to acoustic impedance of the wall should be considered correctly., On the other hand, in the case of obstacle body of complex shape, three-dimensional inverse solution. to the wave equation must be calculated. In the present research, we proposed a three-dimensional boundary element method which gives high accuracy solution to the wave equation. The rail-time identification of three-dimensional obstacles is under development and we plan to report the results.

本研究的目的是建立一种基于计算机数值计算的流动诊断方法。流动诊断是指检测和识别包含在管道或流体机械的流场中的障碍物或空腔。本文首先对一个简单的充水封闭水箱进行了基础研究，然后对一般流道进行了处理。在两种不同形状的矩形槽中产生了高能量的小电流放电.例如，一个由丙烯酸树脂制成，另一个由黄铜制成，由于放电而突然产生气泡，从而产生脉冲压力波。实现了气泡的稳定产生、排出电路和感测电路的正确同步、具有非常高频率的信号的接收、以及使用A/D转换器的对计算机的高速数据存取，并且可以高精度地测量流量。计算结果表明，对于形状简单的障碍物，一维方法可以给出满意的解。例如，在一个实施例中，sphere）。虽然压力波阵面的实际形状是不稳定的、复杂的，但如果考虑波阵面在障碍物上的穿透、折射和绕射，一维几何声学给出了高精度的解。然而，在计算壁面反射波时，一维解是不够的，但应正确考虑壁面声阻抗引起的反射特性。另一方面，在障碍体形状复杂的情况下，三维逆解。必须计算波动方程。在本研究中，我们提出了一个三维边界元法，它给出了波动方程的高精度解。三维障碍物的铁路时间识别正在开发中，我们计划报告结果。

项目成果

Akasaki, T., Miyake, Y. and Bando, K.: ""Basic Research of Flow Diagnosis by Pressure Wave"" Proceedings of 66th Annual Meeting of JSME Kansai Branch. No. 914-2. 31-33 (1991)

Akasaki, T.、Miyake, Y. 和 Bando, K.：“压力波流量诊断的基础研究”JSME 关西分会第 66 届年会论文集。

三宅,板東,赤碕: "水中火花放電による圧力波の発生とその伝ぱ" 日本機械学会論文集(B編). 57巻541号. 3267-3272 (1991)

Miyake，Bando，Akasaki：“水下火花放电产生的压力波”，日本机械工程师学会会刊（B 版），第 541 卷，3267-3272（1991 年）。

三宅 裕,板東 潔,赤碕 琢也: "水中火花放電による圧力波の発生とその伝ぱ" 日本機械学会論文集. 57ー541. 3267-3272 (1991)

Yutaka Miyake、Kiyoshi Bando、Takuy​​a Akasaki：“水下火花放电产生的压力波及其传播”，日本机械工程师学会汇刊 57-541 (1991)。

Miyake, Y., Bando, K. and Akasaki, T.: ""Generation and Propagation of Pressure Wave by Spark Discharge in Water"" Trans. JSME (B). 57-541. 3267-3272 (1991)

Miyake, Y.、Bando, K. 和 Akasaki, T.：“水中火花放电产生和传播压力波”Trans。

Yutaka MIYAKE,Kiyoshi BANDO,Takuya AKASAKI: "Generation of lmpulsive Pressure Wave by Spark Discharge in Water and its Propagation" International Jounal of Experimental Heat Transfer,Thermodynamics,and Fluid Mechanics(Experimental Thermal and Fluid Scienc

Yutaka MIYAKE、Kiyoshi BANDO、Takuy​​a AKASAKI：“水中火花放电产生的脉冲压力波及其传播”International Journal of Experimental Heat Transfer,Thermodynamics,and Fluid Mechanics(实验热与流体科学)