Testing device and method for calibrating hydrogen concentration

Abstract

The invention provides a test device and method for calibrating hydrogen concentration, the test device for calibrating hydrogen concentration comprises a reflective schlieren system and a calibrationbox, and the calibration box is made of a polymethyl methacrylate material; two threaded holes of 10 mm are formed in the upper portion of the calibration box, threaded connection is adopted, one threaded hole is an air inlet hole and connected with an air inlet pipe, and the introduction amount of hydrogen is controlled through a flow valve; the other threaded hole is used as an exhaust hole andis fixedly provided with a hydrogen sensor; the calibration box is located in a to-be-measured flow field area of the reflection type schlieren system, it is guaranteed that the calibration box and the reflection type schlieren system are consistent in center height, and a high-speed camera is used for shooting schlieren images. The relation between the gray value and the concentration is directly calibrated through the schlieren technology for the first time, and the calibration result can meet the requirement for multi-scene hydrogen leakage concentration distribution visual measurement andis not limited to axisymmetric hydrogen jet flow; the calibration result has robustness and repeatability, and a proper calibration result can be selected according to the position of the knife edge.

Description

technical field [0001] The invention belongs to the technical field of hydrogen energy, and in particular relates to a test device and a method for calibrating hydrogen concentration. Background technique [0002] As a new type of energy, hydrogen energy has attracted people's attention due to its outstanding advantages such as high combustion efficiency, clean combustion products, easy and low-cost storage and transportation, and diversified uses. However, once hydrogen leaks, it can easily cause an explosion. Therefore, the research on hydrogen leakage and diffusion stage is of great significance. The results of visual measurement of hydrogen concentration play an important role in the study of hydrogen leakage concentration distribution. The visual calibration of hydrogen concentration is a technical difficulty in the visual measurement of hydrogen concentration, and the accuracy and precision of visual calibration will directly affect the accuracy and precision of meas...

AI Technical Summary

Problems solved by technology

[0007] This calibration method is only suitable for the density calibration and measurement of the flow field. It has high requirements for the uniformity of the flow field to be measured, and the calibration result is easily affected by the external light beam.

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