Flow Around a Cylinder

In: Science

Submitted By mdabdurrahman
Words 4060
Pages 17
Queen Mary University of London
School of Engineering and Materials Science

Laboratory Report
DEN5242 - Aerothermodynamics of Fluid Flows
Flow Around a Cylinder

Rehad Islam Choudhury
Student Number: 120100288
20th November 2014

Abstract
A cylinder is placed inside a closed circuit wind tunnel to observe the effects of flow around it. The cylinder is tested for smooth (i.e. laminar) and turbulent flow. The cylinder has pressure tappings around its centre which are connected to an inclined multi-tube methylated spirit manometer. Pressure readings are taken all around the cylinder for both flow conditions and graphs of pressure coefficient, Cpϕ relative to angular degrees, ϕ° as well as a graph to approximate the coefficient of drag, CD is also produced. The report highlights the similarities and difference between the two different flows as well comparing them to a theoretical flow. Various calculations are done to work out variables like the tunnel calibration constant, K, the free stream velocity, V∞ and the Reynolds number of each flow. In the discussion, the errors of the experiment are outlined and comments are made for improvements.
Contents
Abstract 2 1. Introduction 3 2. Apparatus 3 3. Experimental Procedure 3 4. Results & Calculations 4 5. Discussion 9 5.1 Results & Comparison 9 5.2 Calculations & Further Comparison 9 5.3 Errors & Improvements 10 6. Conclusion 10 7. Reference 10

1. Introduction
An experiment was carried out in order to measure the pressure distribution acting on a smooth cylinder that was placed with its axis perpendicular to the air flow in a closed circuit wind tunnel. The experiment involves testing a smooth cylinder under both smooth and turbulent flow conditions. The results will be compared against theoretical values that were obtained mathematically for a frictionless…...

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