Sonic Nozzles音速喷嘴

A “sonic nozzle” (also known as “Critical Flow Venturi” or “Critical Flow Nozzle”) is a flow meter that can be used as a calibration standard for gas flow meters or any flow measurement device.
By design, sonic nozzles are a constant volumetric flow meter. However, with the use of a regulated pressure supply, the sonic nozzle becomes a “state-of-the-art” mass flow meter. Considering both the divergent section design and the flow rate, sonic nozzles may operate with an exit pressure as high as 90% of the inlet pressure.

一个“声波喷嘴”（也称为“临界流文丘”或“临界流量喷嘴”）是一个流量计，可作为气体流量计或任何流量测量装置的校准标准。

通过设计，声波喷嘴是一个恒定的容积式流量计。然而，由于使用了受管制的压力供应，声波喷嘴变成了一个“最先进的”质量流量计。考虑到不同截面的设计和流量，声波喷嘴可能会在出口压力高达90%的出口压力下运行。

Subsonic Venturis亚音速文氏管

Subsonic Meters

ASME Flow Nozzles ASME流喷嘴