MODELLING RESISTANCE TO AIRFLOW THROUGH BEDS OF AGROPYRON AND CORN.ESTIMATION OF POWER VENTILATION

摘要

Resistances to airflow in beds of agro-pyron and corn employing vertical and horizontal airflow directions were measured,in order to show how designing an aeration system is affected by the size and the morphology of each kind of the grain.The airflow velocity range was 0.014-0.336 m~3/s-m~2.Pressure drops were higher when vertical airflow direction was used.Pressure-drops increased with airflow velocity for both airflow directions.At vertical airflow direction,airflow resistance of corn was in average 57% lower than agropyron,while at horizontal airflow direction was in average 76% lower,in the same order.Mathematical models from literature were used to adjust the experimental data with the aim to predict the airflow resistance.The analysis of variance (ANOVA) demonstrated that airflow direction,velocity,kind of grain and bulk density have effect on pressure drop.The estimation of the required power ventilation -based on the predictions of Mattei model- was also realized.