What is the difference between Mach cone and shock wave in aerodynamics?

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Discussion Overview

The discussion centers on the distinction between Mach cones and shock waves in aerodynamics. Participants explore the definitions, representations, and implications of these concepts, examining diagrams and analogies to clarify their understanding.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant questions whether the Mach cone represents the area of the shock wave or the wave front of the Mach wave, suggesting a need for clarity in diagrams.
  • Another participant challenges the idea that the shock wave is located at the intersection of circles, proposing that if sound is generated continuously, the intersection would be more complex.
  • A further contribution suggests visualizing many circles within the cone to illustrate the continuous nature of sound generation, implying that the intersection point becomes less defined.
  • One participant draws an analogy to a bow wave created by a boat, noting that it resembles the shock wave of an aircraft and emphasizing the continuous nature of wave generation.
  • Another participant asserts that the circles depicted in shock wave diagrams are not physically real, reinforcing the idea of continuity in the wave process.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between Mach cones and shock waves, with no consensus reached on their definitions or representations.

Contextual Notes

The discussion highlights potential limitations in understanding the intersection of wave representations and the implications of continuous sound generation, which may affect interpretations of diagrams.

TimeRip496
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Is mach cone the area of the shock wave or the wave front of the Mach wave?
Usually the diagram for mach cone is this,
upload_2018-1-8_16-28-27.png


However I still see some author states that the Mach cone is the shock wave. Shouldn't the shock wave be at the intersection(between the circles) and if the Mach cone is about the shock wave, shouldn't the diagram be like this instead?
upload_2018-1-8_16-33-35.png
 

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TimeRip496 said:
However I still see some author states that the Mach cone is the shock wave. Shouldn't the shock wave be at the intersection(between the circles)
Imagine there are not just 3, but many more circles (the sound is generated continuously). Where would their intersection lie?
 
Try drawing a thousand circles in your cone. Where is the intersection now? Unless of course, sound is only generated a three intervals:wink:.
 
Take a look at the bow wave on a boat. It extends out in a v shape just like the shock wave of an aircraft. The resulting wave eventually reaches the bank where it appears to move along the water's edge in much the same way that a shock wave passes over the ground.

The circles on the drawings of a shock wave don't really exist because the process is continuous.
 

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