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A gas is discharging through an orifice from an upstream pressure, P1, to a downstream pressure P2. The heat capacity ratio of the gas is

A gas is discharging through an orifice from an upstream pressure, P1, to a downstream pressure P2. The heat capacity ratio of the gas is 1.35

a) Sketch a plot of mass flow rate through the orifice versus downstream pressure, P2, and label the main features.

b) Discuss all the assumptions in deriving the above sketch, using equations to show how they affect the modelling.

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