Generation and transport of equivalence ratio fluctuations in an acoustically forced swirl burner

摘要: Abstract In the context of thermoacoustic instabilities, knowledge about generation and transport equivalence ratio fluctuations is highly important to correctly model their impact on flame transfer function. this work, spatially resolved perturbations in mixing section an acoustically forced, partially premixed swirl burner typical modern gas turbine combustors are investigated. Tunable diode laser absorption spectroscopy using a wavelength-modulation approach applied assess inhomogeneous field radial direction. Particle image velocimetry measure axial velocity field. Based these results, tomographic reconstruction utilized deduce local fuel distribution at two locations. Integrated, global calculated compared simple line-of-sight measurements. The influence forcing frequency amplitude investigated good agreement was found between different measurement approaches. Frequency dependent perturbation mechanisms driven by air swirler, as well pressure injector, observed. Two functions modeling diffusion dispersion results reveal substantial differences, indicating significant coherent that not accounted for either models.