一、前言测定内燃机每个循环平均吸入的空气量,使用节流式流量计比较简便。但是,普通的节流式流量计(本文将圆孔中心线与管道同心的一般孔板节流式流量计称作普通流量计),例如ISA-1932型喷嘴流量计等,其低雷诺数区域的流量系数一般与雷诺数有很大的依赖关系。用这样的节流式流量计来测定吸入的空气量是不适当的。 First, the foreword Determination of the average intake of air per cycle of the internal combustion engine, the use of throttling flowmeter is relatively simple. However, an ordinary throttled flowmeter (a generic orifice meter with concentric centering of the circular hole and a pipe is referred to herein as an ordinary flowmeter), such as an ISA-1932 nozzle flowmeter, etc., has a low Reynolds number The flow coefficient generally has a large dependence on the Reynolds number. It is not appropriate to measure the amount of air sucked in by such a throttle type flow meter.