AE8602 Experimental Aerodynamics Notes Regulation 2017

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UNIT I BASIC MEASUREMENTS IN FLUID MECHANICS

Objective of experimental studies
Fluid mechanics measurements
Properties of fluids
Measuring instruments
Performance terms associated with measurement systems
Direct measurements
Analogue methods
Flow visualization
Components of measuring systems
Importance of model studies.

UNIT II WIND TUNNEL MEASUREMENTS

Characteristic features,
operation and performance of low speed,
transonic, supersonic and special tunnels
Power losses in a wind tunnel
Instrumentation and calibration of wind tunnels
Turbulence
Wind tunnel balance
Wire balance
Strut-type
Platform-type
Yoke-type
Pyramid type
Strain gauge balance
Balance calibration.

UNIT III FLOW VISUALIZATION AND ANALOGUE METHODS

Visualization techniques
Smoke tunnel
Hele-Shaw apparatus
Interferometer
Fringe-Displacement method
Schlieren system
Shadowgraph
Hydraulic analogy
Hydraulic jumps
Electrolytic tank.

UNIT IV PRESSURE, VELOCITY AND TEMPERATUREMEASUREMENTS

Pitot
static tube characteristics
Velocity measurements
Hot-wire anemometry
Constant current and Constant temperature Hot-Wire anemometer
Pressure measurement techniques
Pressure transducers
Temperature measurements.

UNIT V SPECIAL FLOWS AND UNCERTAINTY ANALYSIS

Experiments on Taylor
Proudman theorem and Ekman layer
Measurements in boundary layers
Data acquisition and processing
Signal conditioning
Uncertainty analysis
Estimation of measurement errors
External estimate of the error
Internal estimate of the error
Uncertainty calculation
Uses of uncertainty analysis.

OUTCOMES

  • Knowledge on measurement techniques in aerodynamic flow.
  • Acquiring basics of wind tunnel measurement systems
  • Specific instruments for flow parameter measurement like pressure, velocity.
  • Use measurement techniques involved in Aerodynamic testing.
  • Analyze the model measurements, Lift and drag measurements through various
    techniques and testing of different models.
  • Apply the Wind tunnel boundary corrections and Scale effects

TEXT BOOKS

  1. Rathakrishnan, E., “Instrumentation, Measurements, and Experiments in Fluids,” CRC Press – Taylor & Francis, 2007.
  2. Robert B Northrop, “Introduction to Instrumentation and Measurements”,
    Second Edition, CRC Press, Taylor & Francis, 2006.

REFERENCES

  1. Bradsaw “Experimental Fluid Mechanics”, Elsevier, 2nd edition, 1970.
  2. Pope, A., and Goin, L., “High Speed Wind Tunnel Testing”, John Wiley, 1985.