Journal
FUEL
Volume 290, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2020.120027
Keywords
Ignition; Impinging flame; High speed imaging; Schlieren velocimetry
Categories
Funding
- National Natural Science Foundation of China [51976121, 51306113]
- National Science and Technology Major Project of China [2017-III-0007-0033]
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The experimental study investigated the ignition characteristics of hydrogen enriched methane diffusion impinging flames using high speed color and schlieren imaging techniques. Results show that the flow field velocity increases with the hydrogen percentage, reaching over 3.5m/s at 60% hydrogen volume. The techniques used in the study are simple and convenient, showing potential for application in experiments with more complex combustion configurations.
The ignition characteristics of hydrogen enriched methane diffusion impinging flames are investigated experimentally. Keeping the total fuel flow rate constant, the hydrogen volume percentage is set at 40% and 60% respectively, while a pure methane flame is also involved for comparison. Two traditional optical diagnostics, high speed colour and schlieren imaging techniques have been used to tackle the fast transient ignition process with advanced digital image processing algorithms. The weak blue flame during the ignition process, which is hardly seen on the original high speed images, has been enhanced selectively to reveal the complete flame structure. The flow field velocity during the ignition process has been estimated using an optimised schlieren motion estimation method. The relative velocity between the flame and flow velocities has also been resolved and analysed. The results indicate that the flow field velocity increases with increasing hydrogen percentage. The maximum velocity detected in the test cases can be as high as over 3.5 m/s when the hydrogen volume percentage is at 60%. The techniques used in the current study are simple to set up and convenient to use, which have shown enormous potential to be applied in the experimental investigations into more complex combustion configurations.
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