_ ______

L/ ________ stagnation points -------~-...>. Figure 2.21 Combination of source, sink and linear flow.

asymmetrical about the x-axis. This implies an asymmetrical pressure distribution, which in turn implies that there is a component of force perpendicular to the direction of the linear flow. This is known as a 'lift force'. This flow pattern leads to some important equations which are used in aerodynamics.