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A premixed propane/air flame stabilized on a triangular bluff body was studied by numerical simulation as a simplified model of many practical propulsion and power generation systems. The sub-grid scale (sgs) probability density function (pdf) approach in conjunction with the stochastic fields solution method is used to account for sgs turbulence–chemistry interactions; a skeleton chemistry mechanism...
The second-order moment (SOM) combustion model proposed by the present authors is compared with eddy-break-up (EBU) and presumed probability density function (PDF) combustion models in large-eddy simulation of jet diffusion combustion, swirling diffusion combustion and premixed combustion behind a bluff body. The statistical results for time-averaged and RMS fluctuation temperatures are validated...
The three-dimensional large-eddy simulation (LES) is carried out for a piloted methane–air jet flame (Flame C), measured in Sandia National Laboratory, and its statistical results are validated by experimental data. The LES statistically-averaged time-averaged temperature, the root mean square (RMS) value of temperature, and time-averaged methane and oxygen concentration are compared with those obtained...
A unified second-order moment (USM) turbulence-chemistry model is used to simulate methane-air swirling combustion and NO formation for different swirl numbers. The simulation results are compared with those using the EBU-Arrhenius (E-A) combustion model, the simplified PDF model of NO formation in turbulent flows and the corresponding experimental results. The comparison indicates that the USM model...
In this paper, flame image processing technique is used to estimate NO x emissive concentration of the pulverized coal boiler. According to the brightness value of flame image pixels, the temperature distribution of the flame is calculated. The combustion characteristic parameters are picked up from the flame image. Based on the back propagation neural network, the model to estimate the NO...
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