Quantitative flow visualization by hidden grid background oriented schlieren

Ramaiah, Jagadesh; Rubeis, Tullio de; Gannavarpu, Rajshekhar; Ambrosini, Dario

doi:10.1016/j.optlaseng.2022.107307

Cited by 5 publications

(1 citation statement)

References 51 publications

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“…Background oriented schlieren (BOS) has been widely used in the field of flow visualization because of its simple equipment, low cost, and the ability to measure the state parameters of the flow field quantitatively [18] . In addition, in our previous research, we found that when the laser beam passes the flow field to be measured, the density gradient on both sides of the gas jet acts as a lens, resulting in the deformation of the laser beam [19] . This paper introduces a method of visualizing a circular hydrogen jet by combining the contour deformation of a laser beam with BOS.…”

Section: Introductionmentioning

confidence: 93%

Visualization and diagnosis of hydrogen jet based on joint methods

jia

shu

et al. 2023

SPIE-CLP Conference on Advanced Photonics 2022

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Hydrogen energy has quietly become the key to dealing with various environmental problems and energy transformation. With the development of the hydrogen energy industry, safety problems caused by hydrogen leakage also occur continuously. It is particularly important to find a safe and reliable visualization technology to detect hydrogen leakage. Some issues about background oriented schlieren and laser beam profile deformation in visualizing and diagnosing flow fields are summed up and studied both theoretically and experimentally. The two optical methods are compared from two aspects of flow field structure visualization and parameter diagnosis. On this basis, the feasibility of combining the background oriented schlieren with the laser beam profile deformation method to visualize and diagnose the flow field is proposed, and an experimental device is established. In addition, the hydrogen flow field is selected as an empirical example. The experimental results show that the combination of background oriented schlieren and the laser beam profile deformation method may be a reasonable and feasible means for complex flow field structure visualization and parameter diagnosis.

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Section: Introductionmentioning

confidence: 93%