Abstract
In this experiment we measured the distribution of the total pressure and the static pressure along
a convergent divergent duct and compared these with Bernoulli’s equation finding the dynamic
pressure then the velocity and compare them with the velocity by the width ratio.
Introduction
This experimental module illustrates Bernoulli’s equation as applied to a convergentdivergent duct.
A Pitot static tube measures both the total pressure and the static pressure independently.
The tube traverses along the axis of the duct and connects to the Manometer via flexible tubes. A clear scale printed on the duct helps to show the probe position. We should see the constant total pressure while observing the rise and fall of the static pressure. We compare the velocity-area ratio as
calculated from Bernoulli’s equation to the experimental results.
Discussion
The velocity of the flow begins with an inlet speed of 37 m/s and increases at as it reaches the
throat till it reaches a maximum speed of 53.3 m/s then it decreases gradually as till it reaches 35
m/s at the outlet.
The dynamic pressure also increases as it reaches the throat area at reaches its’ maximum then it
will decrease as it reaches the outlet.There are a variation of the velocity for the lower surface if we see the graph of the velocity over
the duct.
Conclusion
The relation between the dynamic pressure and the velocity is proportional
The relation between the static pressure and the velocity is inversely proportional
The relation between the static pressure and the dynamic pressure is inversely proportional
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