Question

A 70% efficient nozzle was used in an experiment to find out an unknown type of gas having an inlet velocity, inlet pressure and stagnation pressure of 231.6 m/s, 1 MPa and 1.2 MPa, respectively. The gas passes through this adiabatic nozzle with an exit pressure of 0.4 MPa, a back pressure of 0.3 MPa and a critical temperature of 277.5°K. Assume the gas to behave as an ideal gas. (a) What is the gas and why? Provide detail of your explanation and calculations (20%) (b) If this question is not solvable, please explain in detail as well as any possibility of shock. If this question is solvable, is the nozzle converging, converging-diverging, diverging or diverging-converging? Please explain in detail.(10%).

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