Flow through nozzle

rst1993 · February 23, 2015, 06:08

I tried solving 1D nozzle flow using Euler equations using finite difference scheme and after convergence of solution i found that at throat Mach No. is 0.9445 and not 1. It's a subsonic-Supersonic nozzle. Though the results are matching with the paper i am trying to reproduce the results of, it doesn't seems right. Is there any problem in-built in solving Euler for varying area section or am i doing anything wrong?

agd · February 23, 2015, 09:58

Are you using boundary conditions that would cause the flow to choke? What is the exit Mach number? Are you sure that you are getting the throat Mach number at the true minimum area?

rst1993 · February 24, 2015, 07:01

Mach no. at exit is 1.3 and throat mach no. is not at the minimum area.

agd · February 24, 2015, 10:05

The flow will choke at the minimum area. If your throat is not at the minimum area then it is not the throat. How is your throat Mach number not at the minimum area?

February 23, 2015, 06:08	Flow through nozzle	#1
rst1993 New Member Rahul Singh Join Date: Aug 2014 Posts: 16 Rep Power: 11	I tried solving 1D nozzle flow using Euler equations using finite difference scheme and after convergence of solution i found that at throat Mach No. is 0.9445 and not 1. It's a subsonic-Supersonic nozzle. Though the results are matching with the paper i am trying to reproduce the results of, it doesn't seems right. Is there any problem in-built in solving Euler for varying area section or am i doing anything wrong?

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February 23, 2015, 09:58		#2
agd Senior Member Join Date: Jul 2009 Posts: 351 Rep Power: 18	Are you using boundary conditions that would cause the flow to choke? What is the exit Mach number? Are you sure that you are getting the throat Mach number at the true minimum area?

February 24, 2015, 07:01		#3
rst1993 New Member Rahul Singh Join Date: Aug 2014 Posts: 16 Rep Power: 11	Mach no. at exit is 1.3 and throat mach no. is not at the minimum area.

February 24, 2015, 10:05		#4
agd Senior Member Join Date: Jul 2009 Posts: 351 Rep Power: 18	The flow will choke at the minimum area. If your throat is not at the minimum area then it is not the throat. How is your throat Mach number not at the minimum area?