Jiang Rong Xu

3-D Simulation of Methane/Air Combustion in the Ring Porous Medium Burner

The different mathematical and physical models of one-dimension or two-dimension for premixed air combustion in the ring porous medium burner are reported in the literatures. In this paper, a case of combustion of methane/air ratio 0.6, the fluid velocity 0.2m/s and the adiabatic wall of burner is simulated by three-dimensional single temperature model. The numerical results show a good agreement with two-dimensional model for combustion characteristics, such as temperature and velocity distributions in burner, which provides important theoretical basis for the development of new porous medium burners.

Numerical Simulation for Premixed Combustion of Multiple Ejection/ Tangential Burner

The methane combustion air coefficient is expected to reach nearly or over 1.2 drawn from previous studies, through rationally allocating the position of the Venturi tube when rotation angle in the 16-18° and tilt angle between 7-7.5°. This paper carries on the numerical simulation of combustion in porous media based on previous work by selecting the optimum conditions, in order to provide certain references for the improvement of porous burner.

Characteristic of Low Calorific Fuel Gas Combustion in Porous Burner by Preheating Air

The combustion characteristic of low calorific fuel gas was numerically investigated in porous burner by preheating air. Two-dimensional temperature profile, flame propagation precess, and CO reaction rate were analyzed detailly by preheating air, and compared with that of room air. The results showed that when the air is preheated, the combustion flame location locates to upstream, the maximum combustion temperature is higher than that of room air, and flame propagation velocity decreases.The CO oxidation reaction rate increases gradually with the radius distance increaing, but reaction region decreases. CO oxidation region guradually decreases and locates to the upstream with air preheating temperature increasing. Peaks of CO oxidation rate gradually change from two to one.

Experimental Research on Premixed Porous Media Combustion in Multiple Ejection/Tangential Burner

In this paper, the experimental research of porous media combustion was carried on premixed combustion of multiple ejection/tangential burner, the ignition characteristic, the resistance characteristics and the temperature distribution in the burner were obtained, and the experimental results were analyzed in detailed, which can provide references for the improvements of novel porous medium burner.

Two-Order Moment Trajectory Model of Two-Phase Turbulence Flow Based on Particle PDF Transport Equation

Based on the PDF transport equation of particle, a two-order moment trajectory model of particles (TOMTM) is proposed to obtain reasonable statistical characteristics of a two-phase flow. Using the method proposed by Risken, It is shown that TOMTM is just the solution of the particles PDF equation

Numerical Simulation for a Backward-Facing Step Two-Phase Flow Using TOMTM

Based on the PDF transport equation of particle, Using both non-isotropic correlation coefficient and isotropic correlation coefficient, the two-order moment trajectory model of particles (TOMTM) is used to simulate the backward-facing step two-phase flow. It is shown that the isotropic correlation coefficient of TOMTM can simulate the anisotropic turbulence of particle better.

Research on fluid mechanics with the finite analytic/grid method for two-phase turbulence based on PDF theory

in this paper, a finite analysis/grid method for high-dimensional PDF equation of fluid mechanics of two phase flow is proposed. The particle high-dimensional scalar PDF transport equation in position-velocity phase space is reduced to velocity phase space and position phase space. An analytical solution of the particle velocity PDF is obtained by Fokker-Planck techniques, the particle position PDF is solved by finite difference method, which determines the distribution of particles in two-phase flow. It is shown that the Finite Analytic/Grid method can simulate the two-phase flow very efficiently.

Influence Study of the Influence Domain to Numerical Simulation Results with Meshless Method

Meshless method calculation accuracy is influenced by many factors, in which influence domain and node distribution are the most important. Due to the restrictions of the meshless methods themselves, their respective influence factors are different. In the paper, the advantages and disadvantages of the collocation method, the meshless method based on the local weak formulation and collocation (MWS), the meshless radial basis interpolation method based on global weak formulation (RPIM) and the weighted least squares meshless method (MWLS) are discussed by comparing the average error of nodes value in different influence domain radius. The results show that the accuracy of the MVS method is higher, but not stable; the radial basis interpolation method based on global weak formulation (RPIM) is a relatively stable method, but needs a large amount of calculation; better results can be obtained using the collocation with a small amount of the polynomial basis function added, simple and practicable.

Fluid Dynamic Simulation of a Wall-Jet-Flow Loaded with Solid Particles Using the Finite Analytic/Grid Method of PDF Model

In this paper, a classical wall-jet-flow loaded with particles is simulated by the finite analysis /grid method using the particle PDF transport equation, as well as by the finite analysis / particle method, and then the simulation results obtained by the two methods are compared with the experimental results. It is shown that the finite analysis/grid method is effective for the prediction of the particle flow.

Interference Effect and Digital Image Processing Based on Dual-Core Photonic Crystal Fiber

This paper presents the interference effect based on dual-core photonic crystal fiber (PCF) and explains the principle of interference imaging. Interference image of dual-core PCF has been acquired by CCD. Furthermore, digital image processing technique is utilized to extract the skeleton of interference fringes. Eventually, the spacing intervals of interference fringes are obtained successfully by measuring scale calibration. Interference effect based on dual-core PCF paves the way to physical sensing in MEMS field.