摘要流体流速的测量一直是科学研究和工业生产领域的重要课题。如工业生产过程中管道内或炉体内的气体流速的测量，不同的风速会直接影响到系统的运行效率。本文设计了一个基于时差法的高精度超声波风速测量装置，选择合适的器材完成了该装置的搭建，并进行风洞实验验证该测速装置的可行性。围绕该目的本文进行了以下实验研究：
(1)根据时差法原理和风洞尺寸完成超声波风速测量装置的相关设计，选择相应的超声换能器，并设计加工实验装置。
（2）使用该装置在风洞条件下进行了实验，设置风速分别为5m/s,7m/s,10m/s,30386
13m/s,15m/s,20m/s,25m/s，采集实验数据。对采集的数据使用Origin软件进行分析，测量结果与真实值符合得比较好。
关键词:超声波测速，时差法，HG-1风洞
毕业设计说明书（毕业论文）外文摘要
Title Design of High Precision Ultrasonic Speed Measuring Device
Abstract
It is always an important subject in scientific research and industrial field that the measurement of the velocity of fluid flow. For example,the gas flow velocity in the pipe or furnace is measured,which affect the operating efficiency of the system directly.This paper designs a high precision ultrasonic wind speed measuring device based on the time difference method，then complete the device and carry the wind tunnel experiments to verified the feasibility of the speed measurement device. Following experimental studies around the purpose of this paper:
1)Complement the design of ultrasonic wind speed measuring device According to the principle of the time difference method and the size of wind tunnel,then select the corresponding ultrasonic transducer and complement the experimental apparatus.
2)Carry the experiment in wind tunnel at the wind speed of 3m/s,5m/s,7m/s,10m/s,13m/s,15m/s,20m/s,25m/s,then collect the experiment data.The data were analyzed by Origin, and the results were in good agreement with the real values.
Keywords Ultrasonic velocity measurement,Time Difference Method, HG-1 wind tunnel
目录
1.绪论 1
1.1课题背景 1
1.2普通风速测量方法 1
1.3超声波风速测量方法 2
1.4超声波测速的发展 3
1.5本文主要工作 4
2 时差法超声测速系统设计 6
2.1 时差法超声测速原理 6
2.2 超声波的发送与接收 7
2.2.1 超声波换能器 7
2.2.2 试验台 8
2.2.3 驱动信号源 9
2.2.4 接收信号采集设备 9
2.2.5 换能器的安装方式 9
2.2.6 工控机 10
2.3 时差法超声测速设计计算 10
2.3.1 系统总体设计计算 10
2.3.2 风洞条件下的设计计算 12
3 超声波精确风速测量装置风洞实验研究 13
3.1 风洞条件下实验系统 13
3.1.1 实验装置 13
3.1.2 实验步骤 14
3.2 风洞条件下实验结果 14
3.2.1 使用20KHz频率的测速结果 15
3.2.2 使用40KHz频率的测速结果 20 HG-1风洞高精度超声波风速测量装置设计:http://www.youerw.com/zidonghua/lunwen_26062.html