Development of accurate measurment of ventilation resistance

建立了由竖井、与竖井底部相连的巷道和与竖井上部相连的地表建筑组成的地下空间模型，并进行了以下试验：制作了四种不同的表面建筑物，测量了通过它们的空气流速和压力损失，以了解它们之间的阻力差。制作了四种不同的轴底形状和一种导气流，并测量了它们之间的气流流量和压力损失，以了解它们之间的阻力差。通过以上实验得出以下结果：表面建筑的阻力从1255到1915不等（Ns2/m8）。当设计合理时，电阻可以低到不产生表面建筑。轴底部阻力为556 ~ 1114 （Ns2/m8）。当井底与巷道底板水平或井底形状呈斜向时，井底阻力比不采取降阻措施时要小。导空也有助于减少阻力。

A model of sub-surface space which consists of a shaft, a roadway connected to bottom of the shaft and a surface building connected to upper part of the shaft was made and follwing experiments were executed.1. Four different kind of surface buildings were made and the air flow rate and pressure loss through them were measured to know the resistance difference between them.2.Four different kind of bottom shape of the shaft and a guide vain of air flow were made and the air flow rate and pressure loss were measured to know the resistance difference between them as well.The following results were found by the above experimets.1. The resistance of the surface building varied from 1255 to 1915 (Ns2/m8). It was also found that the resistance could be as low as there were no surface building when it was designed appropriately.2. The resistances of the bottom part of the shaft varied from 556 to 1114 (Ns2/m8). They were smaller when the shaft bottome was same level to the floor of the roadway or the shape of the bottom was made obliquely than that when there was no measures to reduce the resistance. Guide vain was also useful to reduce the resistance.