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What happens to the mass flow rate if the reservoir pressure is doubled?(a) Doubled(b) Remains same(c) Becomes half(d) Becomes one – fourthI got this question in a national level competition.This intriguing question comes from Nozzles in section Quasi-One-Dimensional Flow of Aerodynamics

Answer»

Right choice is (a) DOUBLED

The explanation: The mass FLOW rate depends on the INLET stagnation pressure, temperature and throat area by the relation:

\(\dot {m} ∝ \frac {p_0 A^*}{\sqrt {T_0}} \)

Thus, when the resrvoic pressure is doubled, the mass flow rate through the nozzle also doubles as it is directly proportional to it.



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