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

Zoli · March 23, 2014, 05:24

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

FMDenaro · March 23, 2014, 06:02

to tell the truth, I am not sure to understand your question...
However, I can suggest the book of Zucrow ...

Zoli · March 23, 2014, 06:29

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?

mkhm · February 5, 2020, 12:37

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 ?

mkhm · February 6, 2020, 13:07

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 ?

March 23, 2014, 05:24	2D nozzle design of a gradual-expansion nozzle using MoC	#1
Zoli New Member Join Date: Mar 2014 Posts: 6 Rep Power: 12	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

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March 23, 2014, 06:02		#2
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,882 Rep Power: 73	to tell the truth, I am not sure to understand your question... However, I can suggest the book of Zucrow ...

March 23, 2014, 06:29		#3
Zoli New Member Join Date: Mar 2014 Posts: 6 Rep Power: 12	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, 12:37		#4
mkhm Member K Join Date: Jul 2017 Posts: 97 Rep Power: 9	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 ?