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Simulating Jet Turbine Exhaust impinging on a plate

Question asked by 1-DWWB94 on Jan 6, 2010
Latest reply on May 6, 2010 by 1-DWWB94

I have been given a task to analyze the temperature distribution in a flat plate directly underneath the exhaust nozzle of a jet engine.

 

In terms of thermodynamic properties, the jet is described by using the coefficient of convective heat transfer adjacent to the nozzle, the size of the impingement area, and the gas temperature.

 

Becuase of my lack of experience with FEA in general, and especially FlowSimulation, I am not sure what tools are available in SW to do this.  My first thought was to use a fan, but I do not know the characteristics of the flow other than the diameter of the impingement zone and h.

 

So, I settled on using a boundary condition, where I could specify direclty the coefficient of convective transfer.  To do this, I created a circular split on my surface and defined h inside the circle.  When I run the model, I get results that are not meaningful.  In a past exercise, I converted my h to a heat load, and placed a surface source on the surface of my flat plate.  When I run that model, I get a temperature distribution that is as expected, but the temperatures are too high, as the temperature of the plate reaches the exhaust temperature.  I know that this will happen at equillibrium, but not initially.

 

The question is, I guess, then;  What "tools" or methods would you use with Flow Simulation if you had to model a jet of fluid (in this case, air) impinging on a flat surface.  in my case, I am given h, T and A.

 

Thanks in advance for your assistance,


Wes

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