论文部分内容阅读
答: 在水动力计算中,一段管子的压降由流动阻力△P_(ed)、重位压差△P_(zw)和加速压降△P_(is)三部分组成。其中流动阻力包括摩擦阻力△P_m和局部阻力△P_(ib)(进、出口阻力、转弯、截面变化、集箱阻力等)二部分。摩擦阻力和局部阻力都是不可恢复的压力损失,因此一段管子的局部阻力是该管段进、出口之间的全压降(即静压与动压(P+H)之差)。
A: In the hydrodynamic calculation, the pressure drop of a pipe is composed of flow resistance △ P_ (ed), reposition pressure △ P_ (zw) and acceleration pressure drop ΔP is (is) three parts. Among them, the flow resistance includes two parts of the frictional resistance ΔP_m and the partial resistance ΔP_i (inlet and outlet resistance, cornering, section change, header resistance, etc.). Friction resistance and local resistance are both unrecoverable pressure losses. Therefore, the local resistance of a pipe is the total pressure drop between the inlet and outlet of the pipe (ie, the difference between static pressure and dynamic pressure (P + H)).