advanced diagnostics for thermo fluids n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Advanced Diagnostics for Thermo-Fluids PowerPoint Presentation
Download Presentation
Advanced Diagnostics for Thermo-Fluids

Loading in 2 Seconds...

play fullscreen
1 / 8

Advanced Diagnostics for Thermo-Fluids - PowerPoint PPT Presentation


  • 170 Views
  • Uploaded on

Laser Flow Diagnostics Laboratory. Advanced Diagnostics for Thermo-Fluids. Lecture 1 Introduction. MAE513 Spring 2001 Prof. Hui Meng & Dr. David Song Dept. of Mechanical & Aerospace Engineering. Turbulent Flows. Aircraft Automobiles, Ships Chemical Reactors Material Processing

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Advanced Diagnostics for Thermo-Fluids' - arista


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
advanced diagnostics for thermo fluids

Laser Flow Diagnostics Laboratory

Advanced Diagnostics for Thermo-Fluids

Lecture 1

Introduction

MAE513 Spring 2001

Prof. Hui Meng & Dr. David Song

Dept. of Mechanical & Aerospace Engineering

turbulent flows
Turbulent Flows

Aircraft

Automobiles, Ships

Chemical Reactors

Material Processing

Heat Exchangers

Turbines, Pipes

Our Environment

Atmosphere

Galaxy

Human Body

(Blood Vessels, Lungs…)

need for advanced diagnostics

Understand

  • (Coherent Structures)

Turbulent Flows

  • Predict
  • (CFD, Validation)
  • Control
  • (Topology + Dynamics)
Need for Advanced Diagnostics

Need Measurement

  • Instantaneous
  • Spatial (field)
  • Temporal
  • Velocity & vorticity field
  • Pressure
  • Species concentration
  • Temperature
  • Particle/droplet distribution (number density, size, velocity)
  • ...
laser diagnostics non intrusive
Laser Diagnostics: non-intrusive
  • No solid probes (hot-wire sensor, pitot tube) to obstruct or disturb the flow.
  • Using point (beam focus), planar (light sheet), volumetric (expanded) illumination

Large measurement domain, high spatial sampling resolution

  • Light: carrier of information, thru physical processes (interaction with fluid)

Mie scattering (from particles 0.1~ 100m)

Laser Induced Fluorescence (from particles or molecules)

Rayleigh scattering (from molecules)

Stimulated Raman scattering (from excited molecules)

Direct informationInferred quantity

Doppler shift  velocity

Imageposition - displacement (velocity)

Intensity  concentration, temperature, air pressure

available techniques
Available Techniques
  • Laser Doppler Velocimetry(LDV)

Velocity time history at a point, turbulence statistics at one or two points

  • Particle Image Velocimetry (PIV)
    • Time-series 2D planar velocity field; turbulence statistics fields
  • Holographic Particle Image Velocimetry (PIV)
    • Instantaneous 3D volumetric velocity fields
  • Planar Laser Induced Fluorescence (PLIF)
    • Instantaneous 2D concentration field; Mean and fluctuation concentration <’2>; Intensity of segregation
  • Combined PIV and PLIFScalar Flux <u>
  • Rayleigh scattering, Raman scattering, CARS, etc.
    • Temperature, species concentration
  • Liquid crystal color
    • temperature distribution on a solid surface
  • Pressure sensitive paint
    • Pressure distribution on a solid surface
tools to probe into turbulence velocity u x t
Tools to Probe into Turbulence ----- velocity u(x,t)
  • Computational:
  • Direct Numerical Simulation (low Re)
  • Large Eddy Simulation
  • RANS
  • (Models Need Validation)
  • Experimental:
  • Pointwise: LDV
  • Planar: PIV
  • Volumetric (3D)?