Steady aerodynamics flow analysis for determining the necessary build space of an isolated jet shear layer

Abstract

It is rather difficult to characterize the geometry of multi-body multi-flow problems, such as jet-flap interaction. Even the 1D similarities are not obvious. Therefore, a clear measurement hypothesis cannot be formulated and measurement results are harder to interpret. The solution to this problem is the study of the near field geometry of the isolated jet shear layer. Its geometry can be modelled with the help of the virtual shear layer origin, mixed jet radius and half-jet opening angle. This information is very practical when introducing a second body to the problem. Even though the flow might change a lot, the theoretically necessary space for isolated jet flow can be determined. This superposition allows to make a qualitative guess on possible interaction scenarios, and theoretical jet impingement areas. It is also easier to track deviations from the superposition. The experimental measurement with a spanwise oriented rake in the streamwise plane is cost-effect for symmetric problems: A small streamwise resolution allows for fast measurement times while significant data properties are gathered.