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mass imbalance in wind tunnel problem

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Old   January 25, 2011, 07:46
Default mass imbalance in wind tunnel problem
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Hi. I'm trying to solve a problem of mass imbalance in wint tunnel. I'm solving a laval nozzle in a wind tunnel. I've done the model in GAMBIT, the inlet, compensatory chamber, the nozzle, the measurement chamber and the part o a tunel. The problem, I'm trying to solve should be done in 2D, its supersonic flow. Size of the nozzle is 1,1 m length, the model of the tunnel I've made has 12 m long. The pressure on the inlet is 18 atm. On the outlet should be 1 atm. Why there is a huge imbalance in mass flow? Anyone could help?
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