# Instrumentation of a Wind Tunnel

Topics: Fluid dynamics, Aerodynamics, Wind tunnel Pages: 22 (6864 words) Published: February 5, 2013
PERTH COLLEGE UHI

12
INSTRUMENTATION OF A WIND TUNNEL
PROJECT BEng(Hons)
Gaurab Ghosal

ABSTRACT

The wind tunnel being built in Scone airport is a closed loop wind tunnel. On completion this will provide a much needed facility for education purpose as it can be used by engineering students for aerodynamic evaluations. To conduct these evaluation proper evaluating tools needs to be setup. In this section the possible instruments that can be setup in this wind tunnel has been evaluated with Matlab based evaluation, AutoCAD drawings, morphological analysis and other analytical tools. The most viable and suitable instruments or equipments has been suggested under the given conditions. The constrains and the limitations of this project has been described with further suggestions for improvements has been recommended

CONTENTS

Introduction......................................................................................................4 Measurements and Analysis..........................................................................4 * Air speed...............................................................................................4 * Temperature..........................................................................................7 * Pressure................................................................................................8 * Reynolds Number...............................................................................11 * Turbulence..........................................................................................12 * Force....................................................................................................13 * Turn Table...........................................................................................19 * Fan speed control...............................................................................21 * Flow visualization...............................................................................23 Conclusion.....................................................................................................25 * Limitation and problems faced..........................................................25 * Further recommendations..................................................................25 References.....................................................................................................30 Acknoledgements.........................................................................................32 Appendix........................................................................................................33 * Matlab Program

Logbook

INSTRUMENTATION OF A WIND-TUNNEL
INTODUCTION:
A wind tunnel is aerodynamic research tool which simulates the condition of an object moving in air by blowing the air on it. It is used to study the effects of air moving around a solid object and the forces developed due to this flow. To study the effect the object is placed in a controlled environment and is monitored with sensitive instruments. Instrumentation is vital as it provides the essential experimental information. The data so collected can be used to understand the aerodynamic properties which is then analysed to improve the design or to solve problems related to the design. A wind tunnel without its instruments is like a ‘ship without a sail’. Instrumentation also allows easy recording of such data and preserve it for future use. MEASUREMENTS AND ANALYSIS:

1. Air speed: The speed of air through the wind tunnel test section is vital information for aerodynamic research as the aerodynamic results depends on the relative airflow over the concerned object. Hence often the results so found are plotted with respect to the airspeed. Hence it is important to measure the airspeed correctly and to have a control on the speed of air flowing through the tunnel. For the purpose of measuring air speed the common...