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在管道设计中 ,经常遇到局部阻力系数确定的问题。突然扩大局部阻力系数ξ1=1 - A1 / A2 2是通过理论确定的。通过对三种 A1 / A2 情况下的局部阻力系数的实验研究 ,结果发现ξ不但与两过流断面有关 ,而且还和流速有关。通过实验研究 ,确定了ξ1 与流速 v1 及A1 / A2 之间的关系 ,在设计中 ,只要根据设计流速 v1 与 A1 / A2 就可以采用相应的ξ1 进行管道的水力计算
In pipeline design, the problem of determining the local resistance coefficient is often encountered. Suddenly expanding the local resistance coefficient ξ1 = 1 - A1 / A2 2 is determined by theory. Through the experimental study of the local resistance coefficients of the three A1 / A2 cases, it is found that ξ is not only related to the two cross sections, but also to the flow velocity. Through experimental research, the relationship between ξ1 and flow rate v1 and A1 / A2 is confirmed. In the design, the hydraulic calculation of pipeline can be carried out by using ξ1 according to design flow rate v1 and A1 / A2