容积式流量测量方法和速度式流量测量方法存在费用高，误差大的缺点。
The cost is high and the error is big in volumetric flow measurement method and velocity measurement.
现有的密度补偿模型不适合高温高压饱和蒸汽的流量测量，密度补偿精度较低，导致蒸汽流量测量误差较大。
The existing density compensator model does not fit high temperature and pressure saturated vapor, the density compensator precision is low and causes big error in saturated vapor measurement.
运用流体力学原理，分析了利用时差法进行超声波流量检测时误差产生的相关原因，并提出了修正方法。
The interrelated factors of the error caused by sonic flowmeter using the time difference by hydrodynamics were analyzed, and the correction method was introduced.
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