Dimensionless Space and Time

[WebPilot]

The first cycle influences the second cycle through waves E',
F', and G'. The fresh charge drawn in during the first cycle is
compressed and, as indicated in Part I, is also ignited by waves
E', because obviously no other phenomenon exists that might
serve to set off the explosion.

The second cycle begins with this ignition.

(c.t.)

NOTE: Please disregard the pink color. It was
used for alignment purposes.

The compression waves E', merge and a shock wave is
formed in the flow field. It is travelling to the left so it is
known as a Q-shock.

[mk]

Cool! Very cool!

Nice to see the topic developing! Still there is the 3-D pulse-jet illustration topic. You seem to be quite busy, Forrest?

[WebPilot]

Cool! Very cool!

Nice to see the topic developing! Still there is the 3-D pulse-jet
illustration topic. You seem to be quite busy, Forrest?

Yes, I am trying to be. I wish I could find the time to do more.

Good "reading" from you.

[WebPilot]

This partial enlargement may accomplish two things:

1. It shows the merging compression waves forming a (Q)
shock wave and

2. the dashed line depicts the inflow of air into the tailpipe. This as
I pointed out earlier is known as Paul Schmidt's "intrusion of air".

(c.t.)

NOTE: Please disregard the pink color. It was
used for alignment purposes.

[WebPilot]

F. Shultz-Grunow's diagrams are calculated in a fashion similar as I have
tried to show in my "Kadenacy" example found earlier in this thread.

[WebPilot]

Not for the faint of heart when it comes to mathematics,
but if you have been following this thread, then, you are already
over that hurdle.

Download this 1953 NACA report written by the Ames Research Staff.

Remember: One dimensional compressible flow theory makes
many assumptions, but the fundamental one is this:

The length of the tube is much greater than its diameter.

Pulse jets can be treated in this manner, albeit we are concerned with
unsteady flow.

UFLOW1D is just that, a one-dimensional compressible flow code. Any
model you make where the length approaches the diameter (e.g. Reynst
jar) violates this fundamental assumption. Thus, GIGO applies.

[WebPilot]

 While discussing F. Shultz-Grunow with motthomas, I wondered to where this thread went. I wrote it 4 years and 3 months ago.

 It never made it to "sticky" status, but it's a good thread to read if you've never done so. I enjoyed reading it over one more time.

[WebPilot]

 This is the thread where I tabulated, constructed and discussed my first wave diagram.