Test device and method for calibrating hydrogen concentration

Abstract

The invention provides a test device and method for calibrating the hydrogen concentration. The test device for calibrating the hydrogen concentration includes a reflective schlieren system and a calibration box. The calibration box is made of polymethyl methacrylate material; two openings are opened on the top of the calibration box. 10mm threaded holes, threaded connection, one of the threaded holes is an air inlet, connected to the air inlet pipe, and the amount of hydrogen gas is controlled through the flow valve; the other threaded hole is used as an exhaust hole, and a hydrogen sensor is fixed; the calibration box is located at In the flow field area to be measured in the reflective schlieren system, ensure that the center height of the calibration box is consistent with that of the reflective schlieren system, and use a high-speed camera to capture the schlieren image. For the first time, the invention uses Schlieren technology to directly calibrate the relationship between the gray value and the concentration. The calibration results can meet the requirements for visual measurement of hydrogen leakage concentration distribution in multiple scenarios, and are not limited to axisymmetric hydrogen jets. The calibration results are robust and repeatable, and can Select the appropriate calibration result 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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