lab report
Wind Tunnel
By
Jonathan Jaquias Federico Venturi Mubashir Khan
Georgia (other guy)
Abstract:
1. Introduction and Background:
ν = √ ρair2ΔP
Utilizing Bernoulli’s equation for energy balance and referencing all of the air flowing before the pitot of stagnation as zero and considering the height as negligible; we were then able to reduce bernoulli’s equation into velocity (v) being equal to the square root of two times the pressure (P), at every increment, divided by the density ( ) of air.ρair
In analyzing the drag force and coefficient of drag The pressure readings first must be converted to true pressure readings due to the stagnation point resulting in a minimum pressure at the stagnation point.
From the projected area of the front cylinder (A=D*L), and the total drag
force (F) which is calculated using the manometers free stream velocity(pitot tube upstream of cylinder), along with the density of air( ) the coefficient of dragρair can be obtained through the below equations.
CD = FTotal Drag Force
ρν A2 1 2
Free Stream Frontal
Reinholds number is utilized to compare the theoretical values of the drag coefficient using the stream velocity (V) and the diameter of the cylinder (D) along with the density of air ( ) and dynamic viscosity (μ).ρair
2. Objective:
The Primary objective of the lab is to obtain the relative pressure readings from the manometer at 5 degree increments on the cylinder. The secondary objective is to obtain the drag force readings at each pressure tap increment and obtain the summation of all drag force readings. The third objective is to calculate the drag coefficient using the free stream velocity of the pitot tube. Lastly, the final objective is to compare theoretical values of drag coefficient through Reinholds number which was found using the diameter of the cylinder and averaged pressure readings. 3. Experimental Setup and Procedure: Summarize steps of procedure and how we recorded each value 4. Results and Discussion: Describe each graph
5. Conclusions: