Looking for Rocket Nozzle Equations

treddie · Jan 12, 2010

Howdie.

This may not be the forum for this, but I am having trouble finding a forum on rocket science.

Specifically, it is easy to find various equations for rocket chamber and nozzle design, but they all leave out the crucial equations that relate parabolic nozzle, divergent section, inital & final wall angles to expansion ratio for various % bell nozzles. I have seen graphs of this, but no discussion of the underlying equations.

Any ideas?

Thank you very much,
treddie

jmatejka · Jan 12, 2010

Here is a place to start, De Laval nozzle:

http://en.wikipedia.org/wiki/De_Laval_nozzle

treddie · Jan 12, 2010

jmatejka,

Thank you for your response.

I've actually visited that page before, but what I am looking for is very specific and difficult to find information on. Here is an image of the graph I am trying to find the underlying equations for:

Line graph of initial parabola angle (top) and final parabola angle (bottom), in degrees, against expansion ratio from 5 to 50, with five curves labelled Lf = 60% to 100%.

This graph relates to the following nozzle geometry:

Diagram of a bell-shaped rocket nozzle contour labelled Figure 1.5, showing a circular arc from the throat and a parabola to exit point E, with labels R_t, 1.5R_t, 0.382R_t, theta_n, theta_e, R_e = sqrt(epsilon) R_t, and L_n measured along the nozzle axis.

Looking for Rocket Nozzle Equations

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