一、问题的提出管道中的流量测试,除选用文氏管、孔板或喷咀等通用的流量计之外,在选定的截面上,测取若干点的流速,然后进行一定的运算来确定流量也是一种常用方法。一般可将截面F 分成几块小区域(F=∑F_i),再在每一块区域F_i 中安排一个测点,测到的速度记为V_i,于是通过截面F 的体积流量Q 可近似地表示为 First, the problem proposed in the pipeline flow test, in addition to the use of venturi, orifice plate or nozzle and other general-purpose flowmeter, in the selected section, measuring the flow rate of several points, and then perform certain operations Determining traffic is also a common method. Generally, the section F is divided into several small areas (F=∑F_i), and then a measuring point is arranged in each block F_i. The measured speed is denoted as V_i, and the volume flow Q through the section F can be approximately expressed as