Mach wave interference

Waves of the same character and strength intersect one another with the same configuration as those of reflections from the plane surface discussed above, since the surface may be replaced by the axial streamline, Fig. 6.22a and b. When the intersecting wavelets are of opposite sign the axial streamline is bent at the point of intersection in a direction away from the expansive wavelet. This is shown in Fig. 6.22c. The streamlines are also changed in direction at the intersection of waves of the same sign but of differing turning power.

Mach wave interference

(a) Expansive wavelets

 

(b) Compressive wavelets

 

(c) Wavelets of opposite strength

 

Fig. 6.22 Interference of wavelets

 

Mach wave interference

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