Results show when velocity of flow remains unchanged in the onflow area and openness of the tube is changed, then resistance coefficient ζ changes obviously.
Results show when velocity of flow remains unchanged in the onflow area and openness of the tube is changed, then resistance coefficient ζ changes obviously.
实验结果表明：在湍流区域内流速（量）不变时，改变管件开度，阻力系数ζ变化较显著；改变流量，管件开度不变时，ζ变化不大。