Pitot And Th A Lab Essay

2393 words - 10 pages

The George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology, Atlanta GA 30332-0405 Undergraduate Instructional Laboratories
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TO: Dr. Zhuomin Zhang, Undergraduate Laboratory Instructor September 04, 2014
FROM: ME 4056 Section A-2
SUBJECT: Pitot and ThA Lab
INTRODUCTION
The purpose of the experiment was to measure the velocity profiles of air moving through
a wind tunnel using a Pitot-static probe, a static ring manometer, and a thermal anemometer on
August 28, 2014 in the Thermal-Fluids Instructional Lab of the School of Mechanical
Engineering at Georgia Institute of Technology. The Pitot-static probe was used to measure the
total and static pressures while the static ring manometer measured the atmospheric and static
pressures at the same locations across the wind tunnel test section. The thermal anemometer was
used to measure the velocity and root mean squared velocity at multiple locations across the
width of the wind tunnel test section. The data was used to determine the volumetric flow rate,
the dynamic pressure and velocity traverse of the air flow.
APPARATUS AND PROCEDURE
Apparatus. The GUNT Hamburg HM170 Educational Wind Tunnel is a subsonic open
wind tunnel that has a square channel test section. The wind tunnel utilizes a built-in static ring
manometer, GUNT Hamburg Inclined Tube Manometer 0 mbar to 5 mbar with 0.01 mbar
markings that are connected to a wall-mounted manometer, Dwyer Duragage -0.1" to 1.0" W.G.
with 0.01" markings, to measure static pressure in the test section. The velocity and pressure
measurements were performed using a Pitot-static probe, GUNT Hamburg Prandtl tube. A
thermal anemometer, the Dantec Dynamics A/S MiniCTA Anemometer Package Probe Type
55P16, was used to measure the mean velocity and root mean squared velocity. The velocity
traverse measurements were taken using a thermal anemometer DAQ software, Dantec
Dynamics A/S MiniCTA Anemometer Software. A ruler, GUNT Hamburg 0 mm to 150 mm
with 5 mm markings, was used for the Pitot-static probe, and another ruler, Empire 30 mm
aluminum combination square with 1 mm markings, was used for the thermal anemometer. The
ambient conditions were measured using a mercury-in-glass thermometer with 1°C markings,
and an aneroid barometer with a range from 500 mmHg to 780 mmHg with 5 mmHg markings.

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Uncertainty. Table 1 displayed below lists the equipment used and the associated
uncertainties. The methods for obtaining the values are documented in the table with their
respective references.
Table 1. Apparatus and Associated Uncertainties
Generic Name Commercial ID UA UB
Induced Draft Wind Tunnel
GUNT Hamburg HM170 Educational Wind Tunnel N/A N/A
Static Ring Manometer
GUNT Hamburg Inclined Tube Manometer 0 mbar to 5 mbar w/ 0.01 mbar marking 0.005 mbar
(1) Negligible (2)
Wind Speed Indicator
GUNT Hamburg Inclined Tube Manometer 0 m/s to 28 m/s w/ 1 m/s marking 0.5 m/s
(1) Negligible (2)
Pitot-Static Probe GUNT Hamburg Prandtl Tube .26 V .03...

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