# 2D nozzle design of a gradual-expansion nozzle using MoC

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 March 23, 2014, 04:24 2D nozzle design of a gradual-expansion nozzle using MoC #1 New Member   Join Date: Mar 2014 Posts: 6 Rep Power: 11 Hi! I need a little help with the design. I designed a nozzle with a central starting point of the characteristic lines, so i know how to compute Prandtl-Meyer angle, Mach angle and flow angle Thetha, but i have difficulties with the design of the gradual expansion nozzle- where the characteristic lines at the expansion section are divided from theta0 to thetaMax, like on this picture: I can draw the first characteristic line, that starts from the inlet radius(in this case from point r=1) , but i don't know how to continue. Thanks for the replies, have a nice day

 March 23, 2014, 05:02 #2 Senior Member   Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,402 Rep Power: 68 to tell the truth, I am not sure to understand your question... However, I can suggest the book of Zucrow ...

 March 23, 2014, 05:29 #3 New Member   Join Date: Mar 2014 Posts: 6 Rep Power: 11 Hello FMDenaro! Thanks for your reply and s orry for my indistinctive question. So, my main question is, how can i determine the length of the expansion section (in ellipse on the picture), what is the distance between the characteristic lines?

 February 5, 2020, 11:37 #4 Member   Mary Join Date: Jul 2017 Posts: 94 Blog Entries: 1 Rep Power: 7 Can someone tell me how we can design the expansion section ? I know how to do a minimum length nozzle by the method of characteristics. But how to design from that a gradual expansion nozzle (as depicted in the figure) is not clear for me. Is there any text book explaining this in detail ?

February 6, 2020, 12:07
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Mary
Join Date: Jul 2017
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Quote:
 Originally Posted by FMDenaro to tell the truth, I am not sure to understand your question... However, I can suggest the book of Zucrow ...

Do you know how the minimum length nozzle in the figure above was converted to a gradual expansion nozzle ?