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Expert answer:Paraphrasing - colle writers

Expert answer:Paraphrasing

Solved by verified expert:Hi i need you to paraphrase this word file. you don’t have to paraphrase too much just a simple paraphrasing, so it should not take you a lot of time. I’ve attached the word document.
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Introduction.
The aims of this experiment are to measure the drag forces on a sphere and hemisphere.
Furthermore, to measure the lift and drag forces on an airfoil with different slat and flat configurations at
different angles-of-attack: to measure the surface pressure distribution over an airfoil and cylinder.
Moreover, the final objective is to measure the lift and drag forces on a small-scale fighter jet plane
model. The wind tunnel is designed to measure the aerodynamic forces for several bodies: sphere,
hemisphere, cylinder, airfoil, and small plane model: and to generate airflow of different speeds through
its tunnel. The flow of air in the wind tunnel is assumed to be steady and incompressible, which means
that it is under the control of the continuity equation and the equation for the conservation of energy.
Devises that were used such as the Pitot-static tube to measure both static and stagnation pressure; the
inclined manometer such as the piezometer to measure small pressure changes. The Wind tunnels are
usually used for aerodynamic research to analyze the behavior of airflows under various conditions.
Theory:
To calculate the wind tunnel airspeed, given by the following equation:
𝜌𝐻2𝑂
π‘‰π‘Ž = √2π‘”π‘†πΊπ‘”π‘Žπ‘”π‘’ (
) Ξ”πΏπ‘ π‘–π‘›πœƒ … [1]
πœŒπ‘Ž
Surface pressure distribution:
The pressure distribution to is presented in the following equation
𝐢𝑝 =
𝑃 βˆ’ π‘ƒβˆž
… [2]
1
2
𝑃
𝑣
∞
∞
2
Where π‘βˆž is the free-stream pressure of the flow, p is the local static.
The theoretical pressure distribution over a circular cylinder is given by
𝐢𝑝,π‘‘β„Žπ‘’π‘œ = 1 βˆ’ 4𝑠𝑖𝑛2 πœƒ … [3]
To measure the surface pressure is by drilling a hole into the surface at many points of the body. So the
static pressure of the surface when the manometer is vertical tube, is given by
π‘ƒπ‘ π‘’π‘Ÿπ‘“π‘Žπ‘π‘’ = π‘ƒπ‘Žπ‘‘π‘š βˆ’ π›Ώπ‘”π‘Žπ‘”π‘’ π‘”βˆ†β„Ž … [4]
And when the manometer is inclined with angel is given by
π‘ƒβˆž = π‘ƒπ‘Žπ‘‘π‘š βˆ’ πœŒπ‘”π‘Žπ‘”π‘’ π‘”Ξ”πΏπ‘ π‘–π‘›πœƒ … [5]
Procedure.
1- Speed Adjustment
Drag in a sphere and a hemisphere in Wind Tunnel (2):
β€’
Testing the airspeeds for a supporting rod by placing it in the wind tunnel and setting the airspeed
to be 20, 25, 30, 35, and 40 mph.
β€’
After that, Measuring the corresponding vertical displacement and actual air velocity by placing
the Pitot-tube at the centerline.
β€’
After testing the airspeeds turn off the wind tunnel. Then taking the diameter of a sphere and
placing it with the rod combination in the wind tunnel.
2- Pressure Distribution along an NACA0015 Airfoil in Tunnel (2):
β€’
Place the Pitot tube and a thermal couple in the center of the test section as well as the airfoil
vertically.
β€’
Connect the static pressure ports to one end of the manometer and leave the other end to
atmosphere.
β€’
Connect the holes in the airfoil to the multi manometer.
β€’
Adjusting the AOA to 0ο‚°. Running the tunnel at 20 mph. Record the reading from the
manometer. Running the tunnel at speeds 30&40 and recording in the sheet table at each tap (111).
β€’
Then adjust the AOA to 10 degree, repeat the above at airspeed of 20, 30 and 40 mph.
3- Pressure Distribution around an Instrumented Cylinder in Tunnel (2):
β€’
Place the pitot tube and a thermal couple in the center of the test section as well as the
cylinder vertically.
β€’
Connect the static pressure ports to one end of the manometer and leave the other end to
atmosphere.
β€’
Connect the holes in the cylinder to the multi manometer.
β€’
Adjust the AOA to 5ο‚° run the tunnel at 15 mph. Record the reading from the manometer.
β€’
Record the readings from the manometer at the right half tap (1-18).
β€’
Adjusting the AOA to 5ο‚°, 15ο‚°, 25ο‚°, 35ο‚°, 45ο‚°, 55ο‚°, 65ο‚°, 75ο‚°, 85ο‚°, 95ο‚°, 105ο‚°, 115ο‚°, 125ο‚°,
135ο‚°, 145ο‚°, 155ο‚°, 165ο‚° and 175ο‚° and running the tunnel at speed of 20&30 mph.
β€’
Adjust the AOA to 5ο‚° run the tunnel at 10 mph. Record the reading from the manometer.
β€’
Repeating the same steps again.
β€’
The manometer measures the pressure in the wind tunnel as it was attached to it. The pressure
readings in the manometer were used to calculate the actual velocity of the air stream. The actual
air speed vs. meter reading velocity was plotted and the data with a linear function were fit with
wind tunnel 2.
β€’
Moreover, NACA 0015 airfoil was tested at different speeds. The manometer that
connects to it contained many pressure tubes. The pressure decreases initially in magnitude with
an increase in AOA, and once a certain AOA is reach, it remains constant. The graph of 𝐢𝑝 , the
pressure coefficient, was plotted at each tap vs. the non- dimensionalized location of each tap x/c;
where c is the chord length of the airfoil.
β€’
Finally, The cylinder was tested at various speeds. The cylinder had many pressure tubes that
connected to manometer where pressure distribution was projected. As observed, the magnitude
of the pressure increases initially with increase AOA. The Pressure coefficient
(𝐢𝑝 ) 𝑖𝑠 π‘π‘™π‘œπ‘‘π‘‘π‘’π‘‘ 𝑣𝑠.  at each tap location. Also, the theoretical pressure distribution was plotted
on the same graph.
β€’
In this experiment, the data were collected with another that experimented a different set
of objects. Some of the data points were shared since we weren’t able to collect all data point the
entire experiment.
β€’
Bernoulli’s principle was used to measure the air velocity through a wind tunnel. Devises
such as the Pitot-static tube were used to measure both static and stagnation pressure. Inclined
manometer such as the piezometer is used to measure small pressure changes.
β€’
The distance between the end of an edge and the start of an edge is referred to as the chord
length. As the wing of an aircraft are primarily consists of aero foil parts, chord length is also
used to describe the wing width.

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