1 / 9

Direct images of edge flames

Direct images of edge flames. Single flame, 6.5% CH 4 in air, V = 50 cm/sec Twin-flame, 8.0% CH 4 / 32.0% O 2 / 56.0% CO 2 (low Le), V = 40 cm/sec Twin-flame, 2.3% C 3 H 8 / 23.0% O 2 / 74.7% He (high Le), V = 40 cm/sec Field of view is 2.9 cm x 8.1 cm for each image.

francis-sargent
Download Presentation

Direct images of edge flames

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Direct images of edge flames Single flame, 6.5% CH4 in air, V = 50 cm/sec Twin-flame, 8.0% CH4 / 32.0% O2 / 56.0% CO2 (low Le), V = 40 cm/sec Twin-flame, 2.3% C3H8 / 23.0% O2 / 74.7% He (high Le), V = 40 cm/sec Field of view is 2.9 cm x 8.1 cm for each image

  2. Interferometer images of edge-flames Single edge-flame 7.5% CH4 in air V = 40 cm/sec Twin edge-flame 7.4% C3H8 / 29.6% O2 / 63.0% CO2 V = 45 cm/sec Twin edge-flame 2.85% C3H8 in air V = 40 cm/sec Field of view is 1.3 cm x 4.0 cm for each image

  3. Comparison of premixed twin uniform & edge flames

  4. Comparison of premixed single uniform & edge flames

  5. Comparison of nonpremixed uniform & edge flames

  6. Diffusive-thermal instabilities Single edge-flame 9.5% CH4 / 19.0% O2 / 71.5% CO2 (low Le) V = 40 cm/sec Twin edge-flame 2.60% C3H8 / 20.5% O2 / 76.9% CO2 (high Le) V = 30 cm/sec Uniform twin-flame 2.4% C3H8 / 24.0% O2 / 73.6% He (high Le) V = 40 cm/sec Field of view is 2.3 cm x 7.4 cm for each image

  7. Cellular instability of nonpremixed flamesUpper: O2/SF6: 46.7/53.3, 20 cm/sLower CH4/SF6:46.7/53.3, 20 cm/s

  8. Shadowgraph images of nonpremixed flamesUpper: O2/N2: 36/64, 20 cm/sLower H2/N2:18/82, 20 cm/s

  9. Future work • Propagating & retreating edge flames Single premixed Twin premixed

More Related