a=2 b=1 A bullet is to be tested in the laboratory to determine the drag force...

a=2 b=1

A bullet is to be tested in the laboratory to determine the drag force on it. Dependent parameter the drag force D (Newton) depends on the velocity of the bullet V(m/s), the length of the bullet L(m), sound velocity c(m/s), density of fluid ρ (kg/m³) and dynamic viscosity µ(kg/ms).

Solve the problem by making the necessary assumptions and drawing the schematic figure

I-Determine the nondimensional p parameters using repeating variables

ii-a bullet with a speed of 9a,b m/s in air may be modelled in a water tunnel with a test section velocity of 2ab cm/s. Determine the length of the model, if the length of the bullet is 5a,b mm. The air and water temperature is 20 ^oC degree at 1 atm.

iii- if the drag force on the model is measured to be 2,ab N, then determine the expected drag force on the bullet. Comment on dynamic similarity equivalence?

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Expert Solution

samet mamat answered 7 months ago

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