流體力學實驗方法

This module teaches students various techniques and skills in carrying out fluid mechanics experiments and measurements. Major topics include: Similitude and modeling; Wind tunnel design; Mean and fluctuating velocity measurements; Mean and fluctuating pressure measurements; Shear stress measurements; Wind tunnel blockage correction; End plate configurations; Flow visualization; Signal analysis: data acquisition, probability theory, correlation studies , spectral analysis. This module is primarily targeted at graduate students who are conducting experimental fluid mechanics research and those who have interests in experimental fluid mechanics. This module is also appropriate for undergraduate students, especially those who are working on experimental fluid mechanics research for their final year projects.

Fluid Mechanics I and II

無備註

Picture Book: "An Album of Fluid Motion” by M. Van Dyke, Parabolic Press, Inc. DVD: "Multimedia Fluid Mechanics” by G. M. Homsy et al., Cambridge University Press Websites: http://www.efluids.com/efluids/pages/gallery.htm http://media.efluids.com http://www.engineering.uiowa.edu/~fluids/Posting/Video_Gallery.htm http://www.martindalecenter.com/Calculators4_9_FluD.html http://web.mit.edu/fluids/www/Shapiro/ncfmf.html http://www.mne.psu.edu/cimbala/Learning/Fluid/fluid.htm http://www.wiley.com/college/munson/1118116135/video_lib/mainmenu.html?newwindow=true http://higheredbcs.wiley.com/legacy/college/fox/1118026411/video/fox_index.htm?newwindow=true

Mid term exam 30% Final exam 30% Quiz 20% Attendant 10%

• Chapter 1 Dimensional Analysis, Similitude and Modeling

  1.1 Some Important Terms 1.1.1 Dimensions and Units 1.1.2 Dimensional Analysis 1.1.3 Model and Prototype 1.2 Principle of Dimensional Homogeneity 1.3 Determination of Dimensionless Groups 1.3.1 Rayleigh’s Method 1.3.2 Buckingham’s π Theorem 1.4 Some Important Dimensionless Quantities in Fluid Mechanics 1.5 Modeling 1.5.1 Geometric Similarity 1.5.2 Kinematic Similarity 1.5.3 Dynamic Similarity 1.6 Distorted Models

  講授：

  4 Hrs

• Chapter 2 Wind Tunnel

  2.1 Introduction / Motivation 2.2 Types of Wind Tunnel 2.3 Wind Tunnel Design 2.3.1 Design Sequence 2.3.2 Main Components of a Typical Wind Tunnel 2.3.3 Test Section 2.3.4 Diffuser 2.3.6 Corners 2.3.7 Fan 2.3.8 Contraction 2.3.9 Settling Chamber, Honeycombs and Screens 2.4 Generation of Shear Flow in a Wind Tunnel 2.5 Ground Vehicle Wind Tunnel 2.6 Methods to Eliminate or Suppress Floor Boundary Layer

  講授：

  4 Hrs

• Chapter 3 Mean and Fluctuating Pressure Measurement

  3.1 Static or Mean Pressure Measurement 3.1.1 Differential Pressure Measurement 3.1.2 Absolute Pressure Measurement 3.2 Fluctuating (Dynamic) Pressure Measurement 3.3 Tubing Systems 3.3.1 Multi-Stage Tubing System 3.3.2 Theory to Predict Frequency Response and Phase Shift Incurred by Tubing System 3.3.3 Tubing Frequency Response Correction Method 3.4 Pressure Averaging Technique 3.5 Recent Developments

  講授：

  3 Hrs

• Chapter 4 Blockage Corrections

  4.1 Introduction / Motivation 4.2 Blockage Associated with Bodies of Different Shapes 4.2.1 Streamlined Body Flow 4.2.2 Bluff Body Flow 4.2.3 Quasi-Streamlined Flow 4.2.4 Lifting Bodies 4.3 Blockage Corrections for Mean Force Measurements 4.3.1 Bluff Body Flow Method 4.3.2 Quasi-Streamlined Flow Method 4.3.3 Wall Pressure Signature Method 4.3.4 Which Method to Use? 4.4 Blockage Correction for Lifting Bodies 4.5 Blockage Corrections for Mean Pressure Measurements 4.6 Correction for Flow Properties 4.6.1 Reference Flow Velocity in Uniform Flow and in Shear Flow 4.6.2 Effective Reynolds Number 4.6.3 Blockage Corrections for Fluctuating Quantities 4.6.4 Correction to Strouhal Number

  講授：

  2 Hrs

• Chapter 5 End Plates

  5.1 Introduction / Motivation 5.3 Effects of End Plate Diameter on Measured Drag 5.4 Effects of End Plate Diameter on Base Pressure of Prismatic Bodies 5.5 Recent Findings References

  講授：

  1 Hrs

• Chapter 6 Flow Visualization

  6.1 Introduction / Motivation 6.2 Tracer Method 6.2.1 Smoke Flow Visualization 6.2.2 Dye Injection Method 6.2.3 Hydrogen Bubble Technique 6.3 Surface Flow Visualization 6.3.1 Surface Oil Flow Pattern 6.3.2 Tuft Flow Visualization 6.4 Optical Methods 6.4.1 Shadowgraph 6.4.2 Schlieren

  講授：

  3 Hrs

• CHAPTER 7 Mean and Fluctuating Velocity Measurements

  7.1 Pressure difference methods - Pitot, static, Pitot static tubes. 7.2 Thermal methods - Hot Wire / Hot Film Anemometry. 7.3 Laser methods - Laser Doppler Velocimetry. - Particle Image Velocimetry.

  講授：

  6 Hrs

• Chapter 8 Shear Stress Measurement

  Pressure difference measurement Direct measurement Momentum balance Wall similarity Heat transfer gauge Liquid traces

  講授：

  4 Hrs

• CHAPTER 9 Data acquisition and data processing

  The General Data Acquisition System Resolution and quantizing error Sampling Frequency and Aliasing Experimental errors and uncertainty Data processing

  講授：

  3 Hrs

Lecture notes will be provided. Low-speed wind tunnel testing, 3rd Edition, Jewel B. Barlow, William H. Rae, Alan Pope, Wiley, 1999. Fluid mechanics measurements, 2nd Edition, Richard J. Goldstein, CRC Press, 1996. Measurement in fluid mechanics, Stavros Tavoularis, Cambridge University Press, 2009. Experimental methods for engineers, 8th Edition, Jack Holman, Mcgraw-Hill Series, 2011. Springer handbook of experimental fluid mechanics, Tropea C., Yarin A. L. and Foss J. F., Springer, 2007.

地點

EE477

時間

After lectures or by appointment

聯絡方式

engp4324@nctu.edu.tw