Essay on Pressure Distribution Around a Cylinder

3726 Words Mar 15th, 2016 15 Pages
PRESSURE DISTRIBUTION AROUND A
CYLINDER
DEN5242 – AEROTHERMODYNAMICS OF FLUID FLOWS

NAKIBUL HUSSAIN NUHASH
130760034

Contents
Introduction ............................................................................................................................................ 2
Experimental Apparatus and Instrumentation ....................................................................................... 2
Experimental procedure ......................................................................................................................... 2
Calculations and Results ......................................................................................................................... 3
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Experimental Apparatus and Instrumentation
The experiment is carried out in a closed circuit wind tunnel. The test section is of square cross-section 1.00m x 0.76m. The wind tunnel has a contraction ratio (area upstream of contraction/ area downstream of contraction) of 5.6. The velocity of air in the test section can be fluctuated by adjusting the fan speed using the controller [Motallebi (2010)]. There are also other pressure tappings located both upstream and downstream of the wind tunnel; these are connected to a Betz micro manometer, reading in mmH2O.
A smooth circular cylinder with an outer diameter of 0.1143m is placed with its vertical
(longitudinal) axis on a turntable on the floor of the test section area. The smooth cylinder is equipped with 12 pressure tappings on its surface at angular intervals of 30 0 and the location of the tappings is at mid-span of the cylinder. These pressure tappings (marked 1,
2,…., 12) are connected to the upper ends of tubes 1 to 12 of a multi-tube methylated spirit manometer which is inclined at an angle of 35° to the horizontal. The pressure upstream of the cylinder is obtained by a tapping on the wall, which is connected to one of the tubes of multi-tube manometer and that is number 34 in this experiment. The remaining tubes 13 to
33 are open to the atmosphere. The scale on the multi-tube manometer is in inches with a precision of ±0.1.
The circular cylinder is placed

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