Flame stabilization using large flameholders of irregular shape

TLDR: In this paper, measurements of blowoff velocity and drag coefficient are carried out on various two-dimensional flameholders, including flat plates and single and double-sided vee-gutters, with and without slots cut in their trailing edges.

Abstract: Measurements of blowoff velocity and drag coefficient are carried out on various two-dimensional flameholders, including flat plates and singleand double-sided vee-gutters. The vee-gutters are tested with and without slots cut in their trailing edges. The flat plates are tested at various inclinations to the flowstream, with cutouts in the leading edge, or trailing edge, or both. The test program covers wide ranges of effective pressure ratio obtained using the water injection technique, and it also includes variations in the size, blockage, and geometry of the flameholders. The results show that flameholder size is the most important parameter in determining aerodynamic blockage and that base-shaped modifications play only a minor role. However, base-shaped modifications do have a significant effect on flame stability. In particular, the random removal of material from a regular bluff body always has an adverse effect on its flameholding properties.