Instantaneous flame front identification by Mie scattering vs. OH PLIF in low turbulence Bunsen flame

Abstract Simultaneous OH-PLIF and Mie scatter imaging were used to investigate turbulent premixed flame edge detection under a range of turbulence characteristics on stabilised piloted Bunsen burner. A 527 nm wavelength laser beam is generate scattering sheet at 500 Hz, 283 created using 355 pump an optical parametric oscillator induce florescence from OH radicals 5 Hz. phase-locking technique applied synchronize lock the two systems. The number density method has been detect edges in images, three algorithms images as reference. comparison methods different parameter setting made by metrics location difference, surface curvature edges. processed data show that once well-tuned window size determined applying method, averaged spatial differences between are order or smaller than laminar thickness, demonstrating these conditions, high frequency measurements can be well define resolution. positive result confirms double-frame allows measurement conditional velocity distributions properties simultaneously solely scattering, provided particle suitably designed around 16 px $$^2$$ 2 per particle. Graphic