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摘要

In this study, the feasibility of using surrogate gases for analyzing the non-combustion behaviors of hydrogen jets was investigated through an experimental setup that involved Planar Laser-Induced Fluorescence (PLIF) and schlieren imaging techniques. A mixture of hydrogen gas and acetone vapor, produced by mixing liquid acetone with hydrogen in a chamber, was injected into the experimental chamber using a hollow-cone-shaped injector. The acetone molecules were excited using an Nd-yag 266 nm pulse laser beam, and their emission was captured with a color high-speed camera equipped with an intensifier. Concurrently, schlieren images were obtained with a black-and-white high-speed camera using a beam splitter, allowing for simultaneous recording from the same plane as the PLIF images. Post-processing of the images was conducted using MATLAB, enabling the precise alignment and comparison of PLIF and schlieren images based on the invariant position of the injector tip edges. The analysis revealed that schlieren imaging depicted a larger jet area than PLIF due to its ability to capture accumulated density gradients, indicative of volume. In contrast, PLIF provided a cross-sectional view of the fuel distribution. The study identified nitrogen and helium as potential surrogate gases for hydrogen, exhibiting similar dispersion patterns that varied with ambient pressure. Additionally, the research highlighted the need for a quantitative analysis method to convert PLIF images into quantitative data, suggesting using Laser-Induced Breakdown Spectroscopy (LIBS) to measure local equivalence ratios as a reference. This approach offers a novel methodology for the detailed analysis of surrogate gas behavior in hydrogen jet experiments, contributing to the broader understanding of gas dispersion dynamics in non-combustion environments.

关键词

Constant Volume Chamber;Optical Diagnosis;Laser measurement;Fuel Distribution Visualization;Schlieren Visualization;Hydrogen Direct Injection;Double Injection

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