Question

Asked Oct 22, 2019

At a given point on a horizontal streamline in flowing air, the static ressure

is -2.0 psi (i.e. a vacuum) and the velocity is 150 ft/s. Determine the pressure at a stagnation point on that streamline. [Answer in units of psi]

Step 1

Given:

The static pressure *p*_{1} at the given point is -2.0 psi.

The velocity *V*_{1} at the given point is 150 ft/sec.

Step 2

Assume:

The density of the air ρ is 0.002377 sugs/ft^{3}.

The velocity *V*_{2} at the stagnation point is zero.

The pressure at the stagnation point is *p*_{2}.

The datum head of the given point and the stagnation point is *z*_{1} and *z*_{2}.

As the streamline is horizontal, *z*_{1} and *z*_{2} are equal.

Step 3

Apply Bernoulli’s Equation at a given p...

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