Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : March 17, 2018 - March 18, 2018
Air-hydrogen mixture flow in a rectangular space with ventilators is studied by unsteady laminar three-dimensional numerical analysis by using the coupled conservation equations of hydrogen and momentum. Froude number, Reynolds number and Schmidt number are introduced in the equations in dimensionless form. Numerical analysis has been performed for three sets of Froude number and Reynolds number. The calculated results are compared with the experimental data of the hydrogen concentration near the roof and the horizontal velocity at the center of the ventilator on the side wall to confirm the validity of the presented numerical method and to clarify the effect of Froude number on the concentration and the velocity. The experimental data showed that the hydrogen concentration was decreased from 100% at the inlet to 5% at 1.01 m high. The calculated results showed also about 5% but each predicted concentration was fluctuated. The averaged concentration was proportional to the dimensionless number Fr/Re. The calculated ventilator velocity gradually decreased and became steady as seen in experiment. The averaged velocity seemed to be proportional to the dimensionless number Re/Fr. The calculated results confirm the validity of the numerical analysis and the ability of Froude number to control the hydrogen concentration near the roof and the air from the ventilator.
