国内外常用的天然气计量仪表的种类很多,其中以孔板流量计的应用最为广泛。但如何解决各种气体流量计的在线系统误差问题,许多国家都没有解决。本文介绍了一种目前较受重视并已开始应用的“音速喷嘴”技术,用以实现孔板流量计的在线系统误差标定。 There are many types of gas meters commonly used both at home and abroad, of which the orifice plate flowmeter is the most widely used. However, how to solve the online system error problem of various gas flow meters has not been solved in many countries. This paper presents a “sonic nozzle” technique that is currently receiving more attention and has begun to be used to implement on-line systematic error calibration of orifice flowmeters.