... using the density-based solver TRACE, employing both finite rate chemistry (FRC) and FGM combustion models. Comparative analysis with the all-speed SLAU2 scheme shows the superior performance of the proposed scheme in handling turbulent reactive multicomponent flows. Fig. 5 Error norm L 2...

...) solver and it has been tested by performing Large Eddy Simulations of the hydrogen/air flame produced by the HYLON injector, which has been individuated as an interesting test case for the proposed dynamic strategy. Turbulence-chemistry interactions are recovered by means of a well-assessed subgrid...

... Mesh Refinements for turbulent liquid fuel jets in crossflow under more representative gas turbine conditions. The predictions were validated in the near and far-field regions using datasets at high pressures (1–8 bar), Weber numbers (720–1172), and momentum flux ratios (6–33). The predictive...

.... The convective wall heat loss is modeled through introducing a source term in the conditionally filtered total enthalpy equation for the CMC cells adjacent to the wall. The mean heat flux is high on the middle surface of the bluff body, but relatively low near its edges. The turbulent heat flux based...

..., the instantaneous flame location can vary in thickness and location due to heat losses or imperfect mixing. Postflame phenomena (slow CO oxidation or thermal NO production) can be expected to be significantly influenced by turbulent eddy structures. Since typical gas turbine combustor calculations require insight...

...), whereas the flow on the blade pressure side close to the band was accelerating (turbine) and directed toward the outlet. Flow separation from the blade leading edge created a vortical flow, which broke up into four parts as it traveled further downstream and created high-energy turbulent eddies...

... zone (TRZ). The Damkohler (Da) number in the reactor is the highest in the stabilization vortex; it varies from about Da ∼ 2 at ϕ = 0.55 to Da ∼ 0.2–0.3 at LBO conditions. Due to the reduced turbulent dissipation rate in PRZ, the Da number is an order of magnitude higher than in TRZ. The global blowout...

... motion results in a faster combustion, hence in a higher efficiency. In summary, the geometrical modifications close to the valve seat result in increased turbulence intensity. It was proven that this intensification raises the ratio of efficiency by 1.6%. 1 Corresponding author. Contributed...

... numbers ranging between 50,000 and 110,000 (with respect to the nozzle diameter, D N ); equivalence ratios between 0.55 and 0.78; and pilot fuel split ratios of 0 to 6%. Characterizing the impingement location on the liner, and the turbulent kinetic energy (TKE) distribution were a fundamental part...

... velocity profiles show that, as flow develops axially, the vortex present in the profile migrates clockwise, opposite to the rotation of the fan, and toward the spinner of the engine. The turbulent stresses indicate that the center of the vortex meanders around a preferred location, which tightens as flow...

.... It is then shown that the axial velocity field produced by the axial-plus-tangential swirler is different from those produced by purely axial or radial devices. It takes here a W-shape profile with three local maxima and two minima. The mean turbulent flame front also takes this W-shape in an axial plane, with two...

... Wisler. 26 07 2017 09 08 2017 Aeronautical propulsion Aerothermodynamics Combustion Combustors Computational fluid dynamics Engines Flame Fuel combustion Fuels Gas turbine technology Modeling Multiphase flows Sprays Swirling Turbulence Turbulent Two-phase Unsteady...

... The acoustic amplitude is then modulated due to stochastic forcing effects from turbulent combustion noise. 2 c.c. denotes the complex conjugate counterparts of the equations two terms. 3 In the remaining sections, the acoustic pressure signal is normalized with pref  = 19,000 Pa for simplified...

... of the long mixing duct can be seen at the very left. The mixing duct has a diameter of 40 mm and is off-centered to the combustion chamber axis by 10 mm. Thus, the fuel/air mixture enters the combustion chamber as an off-centered partially premixed turbulent jet flow. This off-centered setup allows...

... diameter D h = hydraulic nozzle diameter f f , f n = forcing frequency, natural frequency G = diameter or width of actuator outlets K = turbulent kinetic energy m = azimuthal mode number N = number of snapshots N f = SPOD filter size PIV...

... URBINES AND P OWER . Manuscript received July 4, 2017; final manuscript received July 18, 2017; published online October 17, 2017. Editor: David Wisler. 04 07 2017 18 07 2017 Aeronautical propulsion Combustion Droplet Experimental Sprays Swirling Thermoacoustics Turbulent Two...

..., 2017. Assoc. Editor: Klaus Brun. 30 05 2017 10 07 2017 Aeronautical propulsion Aerospace applications Design optimization Droplet Experimental Film Fluids Gas turbine technology Multiphase flows Separated Shear Flows Turbulent Two-phase Unsteady Aerospace Propulsion...

..., 2017; final manuscript received July 25, 2017; published online October 17, 2017. Editor: David Wisler. 01 06 2017 25 07 2017 Aerodynamics Computational Computational fluid dynamics Condensation Droplet Film Modeling Multiphase flows Phase change Turbines Turbulence...

... between the ignition probability field and the airflow turbulent kinetic energy and velocity fields. Local equivalence ratio enhances the importance of the ORZ. Once a successful ignition is accomplished on one injector, the injector-to-injector flame propagation must be examined. High-speed visualization...

...Michael Stöhr; Kilian Oberleithner; Moritz Sieber; Zhiyao Yin; Wolfgang Meier Sudden changes of flame shape are an undesired, yet poorly understood feature of swirl combustors used in gas turbines. The present work studies flame shape transition mechanisms of a bistable turbulent swirl flame...