RESEARCH ON STANDARD DEVICE MEASURING LIQUID HYDROGEN FLOW RATE BY STATIC MASS METHOD

Liquid hydrogen is a cryogenic fluid of ultralow-viscosity and ultralow-density. The error introduced by the replacement with other fluids such as water in flowmeter verification is large. Therefore, it is necessary to develop a liquid hydrogen flow standard device used for the actual flow verification of liquid-hydrogen flowmeters. This paper summarizes the measurement principle, structural composition and functional characteristics of the few low-temperature flow standard devices around the world. A set of standard liquid hydrogen flow rate device is designed based on the static mass method, and its technological process and feasibility are discussed. This review can be helpful to build liquid hydrogen mass flow standards and improve hydrogen flow measurement system providing technical support.