流体流量测量方法很多，节流变压降方法即是应用较广泛的一种。但无论在船舶工程或工业应用中，常常发现其测量精度与要求相差甚远，因此有必要对其误差原因进行分析。一、基本原理标准节流装置的差压与流量之间的关系目前不能完全从理论上推导，但借助实验，确定一些经验系数 Fluid flow measurement methods, throttling variable pressure drop method is a more widely used. But no matter in marine engineering or industrial applications, it is often found that the measurement accuracy is far from the requirement, so it is necessary to analyze the cause of the error. First, the basic principles of the standard throttle device, the relationship between differential pressure and flow can not be completely derived from the theory at present, but with the help of experiments to determine some empirical coefficient