Abstract:
The equation for the pressure fluctuations in a turbulent boundary
layer are derived with special reference to their values at a rigid wall.
It is shown that in incompressible flow the pressure field is defined
completely once the velocity field is known. The results obtained from
the theory are compared with experiment. The work is extended to include
the effects of compressibility and it is found that a treatment similar to
that given by Phillips is appropriate. It is shown that under conditions
of zero heat transfer the theory
slightly modified by the effects
Mach numbers eddy Mach waves ace
pressure distribution throughout
obtained in incompressible flow is only
of compressibility. However, at higher
formed and these modify to some extent the
the layer, and in particular at the wall.
In addition strong radiation of sound occurs under conditions of
flow external to the boundary layer.
supersonic
Comparisons with experiment show moderate agreement. The theories
as mentioned previously are for the case of zero external pressure gradient,
but it is shown that even when these conditions are relaxed similar results
occur. Some experimental results in support of this conclusion are presented.
