STUDY ON REAL GAS FLOWS THROUGH A CRITICAL NOZZLE
Proceedings of the
International Conference on Mechanical Engineering 2009
(ICME2009) 26- 28 December 2009, Dhaka, Bangladesh
International Conference on Mechanical Engineering 2009
(ICME2009) 26- 28 December 2009, Dhaka, Bangladesh
ICME09-FM-03
STUDY ON REAL GAS FLOWS THROUGH A CRITICAL NOZZLE
Mamun Mohammad1, Junji Nagao2, Shigeru Matsuo3, Tokitada Hashimoto3 and Toshiaki Setoguchi4
1 Dept. of Mechanical Engineering, BUET, Dhaka, Bangladesh.
2 Graduate School of Science and Engineering, Saga University, Japan
3 Dept. of Mechanical Engineering, Saga University, Japan.
4 Institute of Ocean Energy, Saga University, Japan.
1 Dept. of Mechanical Engineering, BUET, Dhaka, Bangladesh.
2 Graduate School of Science and Engineering, Saga University, Japan
3 Dept. of Mechanical Engineering, Saga University, Japan.
4 Institute of Ocean Energy, Saga University, Japan.
ABSTRACT
A critical nozzle is used to measure the mass flow rate of gas. It is well known that the coefficient of
discharge of the flow in a critical nozzle is a single function of the Reynolds number. The purpose of the present study is to investigate high-pressure gas flow of air through a critical nozzle. A computational analysis has been carried out to simulate a critical nozzle flow with real gas effects. A modified Berthelot’s equation of state is incorporated into the axisymmetric, compressible Navier–Stokes equations. The computational results show that the discharge coefficient for ideal gas assumptions is significantly different from those of the real gas, as the Reynolds number exceeds a certain value. It is also known that the real gas effects appear largely in terms of the compressibility factor and the specific heat ratio, and these become more remarkable as the gas pressure increases. Furthermore, the effects of amplitudes and frequencies of the pressure disturbance on the gas flow through a critical nozzle were investigated numerically.
discharge of the flow in a critical nozzle is a single function of the Reynolds number. The purpose of the present study is to investigate high-pressure gas flow of air through a critical nozzle. A computational analysis has been carried out to simulate a critical nozzle flow with real gas effects. A modified Berthelot’s equation of state is incorporated into the axisymmetric, compressible Navier–Stokes equations. The computational results show that the discharge coefficient for ideal gas assumptions is significantly different from those of the real gas, as the Reynolds number exceeds a certain value. It is also known that the real gas effects appear largely in terms of the compressibility factor and the specific heat ratio, and these become more remarkable as the gas pressure increases. Furthermore, the effects of amplitudes and frequencies of the pressure disturbance on the gas flow through a critical nozzle were investigated numerically.
Keywords: Compressible flow, Critical nozzle, Real gas effects, Discharge coefficient, Simulation.
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