When objects move through air, forces are generated by the
relative motion between air and surfaces of the body, study of these forces generated by air
is called aerodynamics. Based on the flow environment it can be classified in to external
aerodynamics and internal aerodynamics; external aerodynamics is the flow around solid
objects of various shapes, where as internal aerodynamics is the flow through passages in
solid objects, for e.g. the flow through jet engine air conditioning pipe etc. The behavior of
air flow changes depends on the ratio of the flow to the speed of sound. This ratio is called
Mach number, based on this mach number the aerodynamic problems can be classified as
subsonic if the speed of flow is less than that of sound, transonic if speeds both below and
above speed of sound are present, supersonic if characteristics of flow is greater than that of
sound and hypersonic if flow is very much greater than that of sound. Aerodynamics have
wide range of applications mainly in aerospace engineering ,then in the design of
automobiles, prediction of forces and moments in ships and sails, in the field of civil
engineering as in the design of bridges and other buildings, where they help to calculate
wind loads in design of large buildings.
When objects move through air, forces are generated by therelative motion between air and surfaces of the body, study of these forces generated by airis called aerodynamics. Based on the flow environment it can be classified in to externalaerodynamics and internal aerodynamics; external aerodynamics is the flow around solidobjects of various shapes, where as internal aerodynamics is the flow through passages insolid objects, for e.g. the flow through jet engine air conditioning pipe etc. The behavior ofair flow changes depends on the ratio of the flow to the speed of sound. This ratio is calledMach number, based on this mach number the aerodynamic problems can be classified assubsonic if the speed of flow is less than that of sound, transonic if speeds both below andabove speed of sound are present, supersonic if characteristics of flow is greater than that ofsound and hypersonic if flow is very much greater than that of sound. Aerodynamics havewide range of applications mainly in aerospace engineering ,then in the design ofautomobiles, prediction of forces and moments in ships and sails, in the field of civilengineering as in the design of bridges and other buildings, where they help to calculatewind loads in design of large buildings.
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