Question

Which of these parameters in quasi – one dimensional flow varies w.r.t. x as opposed to the one – dimensional flow?

(a) Cross – sectional area

(b) Pressure

(c) Density

(d) Temperature

The question was posed to me during an interview.

This interesting question is from Governing Equations for Quasi One Dimensional Flow topic in portion Compressible Flow through Nozzles, Diffusers and Wind Tunnels of Aerodynamics

Answer 1

The correct choice is (a) Cross – sectional area

Best explanation: One – dimensional flows are those flows that have a constant crossectional area and only the flow variables i.e. pressure, velocity, density, temperature etc vary wrt x. What separates Quasi one – dimensional flow from this is the variable cross – sectional area wrt x.