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Conical flow is assumed to be symmetric about which of these axis?

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Conical flow is assumed to be symmetric about which of these axis?

(a) X – axis

(b) Y – axis

(c) Z – axis

(d) No symmetry

The question was asked during an interview.

This question is from Quantitative Formulation in section Linearized and Conical Flows of Aerodynamics

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Correct option is (c) Z – axis

For explanation I would say: The conical flow is obtained by keeping a wedge in a y – z plane which is rotated about z – axis. This results in an axisymmetric flow in which the flow properties remain constant along the ray in a cone and depend only on radius r and the axis.

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