影响聚氨酯泡沫塑料回弹性的因素

总结了影响高回弹泡沫塑料回弹性的因素,如泡孔的开孔率、形状、孔径及其规整性。在一定范围内,开孔率越高,回弹性越好;球形泡孔的回弹性高于其它形状泡孔的回弹性;在外力作用下,大孔径泡孔的形变是不可逆的,而小泡孔的形变是可逆的,但泡孔孔径不是越小,回弹性越好,而存在一个最佳值。泡沫塑料的回弹性随泡孔密度的增加而上升。为了获得尽可能大的泡孔密度,要求合理的孔径分布。

Study on application and numerical simulation of the airflow temperature distribution rule in drifting tunnel

According to the law of conservation in the state of turbulent flow, the differential equation describing the airflow temperature distribution in drifting tunnel is derived, By theoretical analysis and field measurement of the airflow and thermal process in mine, theoretical analysis and systematic flow are developed. By PHONENICS program, the numerical simulation is processed, and the changing rule of airflow temperature with various parameters in drifting tunnel is derived. The airflow temperature in drifting tunnel decreases as the airflow velocity increases in a way of negative power exponent, and elevates linearly as the temperature of the incoming airflow elevates.