Experimental Aerodynamics
Teacher
Dr. Sangram Samal
Category
Core Courses
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Course Name : Experimental Aerodynamics
Code(Credit) : CUTM1102(2-1-0)
Course Objectives
- To provide knowledge about different types of wind tunnel and limitations
- Knowledge about experimental instruments.
- To describe flow visualization techniques and to highlight in depth discussion of analog methods.
Learning Outcomes
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To provide about the subsonic and high speed wind tunnel
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To provide Knowledge on measurement techniques in aerodynamic flow
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To cover both operating and application procedures of hot wire anemometer.
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To describe flow visualization techniques and to highlight in depth discussion of analog methods.
Course Syllabus
Module I: Subsonic wind tunnels ( 4 hrs)
Non-dimensional numbers Layout of open circuit and closed circuit subsonic wind tunnels – design parameters-energy ratio - HP calculations. Calibration
Practice- Calibration of subsonic wind tunnel
Module II: Instruments and measurement in subsonic flow (5 hrs)
Pressure, velocity and temperature instruments and measurements, Force measurements – types of balances, Three component and six component balances. Wind tunnel balance (Wire balance, Strut-type, Platform-type , Yoke-type -Pyramid type) and Strain gauge balance
Practice- Lift, Drag and moment measurement by using six component balances
Module III: High Sped Wind tunnel (5 hrs)
Blow down, in draft and induction tunnel layouts and their design features, Transonic, supersonic and hypersonic tunnels, their peculiarities and calibration. Helium and gun tunnels, Shock tubes,
Module IV: Experiments In High Speed Tunnels ( 4 hrs)
Mach number estimation in test section by pressure measurement and using a wedge – preliminary estimates of blowing and running pressures, nozzle area ratios, mass flow for a given test section size and Mach number.
Practice- Velocity and pressure distribution in a supersonic nozzle.
Module V: Special problem in testing (4 hrs)
Pitot-static tube correction for subsonic and supersonic Mach numbers. Geometric, dynamic and kinematic similarity. Solid blockage, horizontal bounce, Calibration of instruments.
Practice- Velocity and pressure distribution in a supersonic diffuser
Module VI: Hot wire anemometer and laser Doppler anemometer (4 hrs)
Hot wire anemometer and laser Doppler anemometer for turbulence and velocity measurements-Use of thermocouples and pyrometers for measurement of static and total temperatures-Use of pressure transducers, Rotameters and ultrasonic flow meters.
Practice- - boundary layer velocity profile on a flat plate using Hot wire anemometer
Module VII: Flow Visualization Methods (4 hrs)
Smoke and Tuft grid techniques – Dye injection special techniques – Optical methods of flow visualization.
Practice- Flow Visualization in subsonic and supersonic flow (Smoke technique in subsonic and Schlieren systems in supersonic flow.
Text Books:
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Name of Author, Title, Publication, Edition
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Rae W.H and Pope. A “Low speed wind tunnel testing” John Wiley Publication, 1984
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Rathakrishnan. E “Instrumentation, Measurement and Experiments in Fluids”, CRC Press, London, 2007
Reference Books:
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A and Goin. L “High speed wind tunnel testing” John Wiley, 1985
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Bradsaw “Experimental Fluid Mechanics”, Elsevier, 2nd edition, 1970.
Source of reference;NSQF – Level 6
Session Plan
Session 1
Session 2
Layout of open circuit and closed circuit subsonic wind tunnels
Session 3
design parameters-energy ratio - HP calculations
Session 5
Practice- Calibration of subsonic wind tunnel
Session 6
Pressure, velocity and temperature measurements
Session 10
Three component and six component balances
Session 11
Wire balance, Strut-type, Platform-type , Yoke-type -Pyramid type
Session 12
Strain gauge balance (external, internal)
Session 13
Practice- Lift, Drag and moment measurement by using six component balances
Session 18
Mach number estimation in test section by pressure measurement
Session 19
Mach number estimation in test section by other method
Session 22
Practice- Velocity and pressure distribution in a supersonic nozzle.
Session 23
correction for subsonic and supersonic Mach numbers
Session 25
Solid blockage, horizontal bounce
Session 26
Calibration of instruments
Session 27
Practice- Velocity and pressure distribution in a supersonic diffuser
Session 30
pressure transducers, Claw yaw meter, Yaw sphere
Session 31
Rotameters and ultrasonic flow meters
Session 32
Practice- - boundary layer velocity profile on a flat plate using Hot wire anemometer
Session 35
Optical methods of flow visualization (The Schlieren method, The Shadowgraph method)
Session 36
Practice- Flow Visualization in subsonic and supersonic flow (Smoke technique in subsonic and Schlieren systems in supersonic flow.
Case Studies
Case Studies
Our Main Teachers
Flight Dynamics, Aerodynamics, Experimental Aerodynamics