Radial turbine problem

ingmecc · January 22, 2012, 06:18

Hi, i'm new in this matter and so i've some questions.
I'm studing a radial turbine that expands a compressible fluid. Though the pressure at discharge of turbine is less than inlet, both the velocity magnitude and relative velocity magnitude on the outlet are bigger than inlet. Is it possible?I analyze its with fluent.

Thank you so much.

Far · January 22, 2012, 12:30

Relative velocity should increase (converging passage blade-to-blade) and absolute velocity should decrease (work is being done, velocity energy is being converted to work). Ensure that solution is full converged and settings (e.g. rotation direction) are OK

ingmecc · January 22, 2012, 19:25

Thank you so much!For convergence i'm testing with steady simplec implicit...step by step increasing inlet total pressure, outlet static pressure and rpm.Is it right??

Far · January 22, 2012, 22:26

Put the required values of total pressure at inlet and static pressure at outlet, however, increase rpm in steps.

January 22, 2012, 06:18	Radial turbine problem	#1
ingmecc New Member Giuseppe DiB Join Date: May 2010 Posts: 7 Rep Power: 16	Hi, i'm new in this matter and so i've some questions. I'm studing a radial turbine that expands a compressible fluid. Though the pressure at discharge of turbine is less than inlet, both the velocity magnitude and relative velocity magnitude on the outlet are bigger than inlet. Is it possible?I analyze its with fluent. Thank you so much.

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January 22, 2012, 12:30		#2
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	Relative velocity should increase (converging passage blade-to-blade) and absolute velocity should decrease (work is being done, velocity energy is being converted to work). Ensure that solution is full converged and settings (e.g. rotation direction) are OK

January 22, 2012, 19:25		#3
ingmecc New Member Giuseppe DiB Join Date: May 2010 Posts: 7 Rep Power: 16	Thank you so much!For convergence i'm testing with steady simplec implicit...step by step increasing inlet total pressure, outlet static pressure and rpm.Is it right??

January 22, 2012, 22:26		#4
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	Put the required values of total pressure at inlet and static pressure at outlet, however, increase rpm in steps.