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Numerical Simulation of Combustion Flow Field in Flue Gas Generator

Author: LiuMingMing
Tutor: ZhengHongTao
School: Harbin Engineering University
Course: Power Machinery and Engineering
Keywords: flue gas generator numerical simulation three dimensional two phase combustion turbulence model NO_x emission
CLC: TK17
Type: Master's thesis
Year: 2008
Downloads: 45
Quote: 1
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Abstract


Combined with a new-style flue gas generator, three dimensional two-phase reaction flows of a flue gas generator is investigated by using numerical simulation method. In this article, the object of study is a flue gas generator on a turbine test-bed. This flue gas generator’s purpose is providing rated temperature and flux flue gas to the turbine, ensuring the turbine test-bed regular work. The numerical results can guide the select of experiment project.In this article, during numerical calculation of diffuse turbulence combustion flow field in the flue gas generator, applied RNG k-εtwo equations turbulence model to calculate the turbulence parameters; applied quick reaction simple PDF model to simulate fuel combustion; applied DO thermal radiation model to consider thermal radiation influence on wall temperature and airflow temperature; applied particle cloud tracking model to describe movement track and transformation process of liquid fuel droplet; applied NO_x model to simulate thermal NO and prompt NO. During the numerical simulation, used the upwind scheme to disperse the equations; applied SIMPLEC algorithm method to solve the equations.In this article, built the three-dimensional entity model; simulated several states of the steady reaction flow and obtaining the turbulent reacting flow field distribution of parameters, including temperature, density, pressure, velocity, mixture fraction of products and volume fraction of contamination; considered the effect of inlet excessive air coefficient and working load on the combustion process and analyzing the effect of inlet excessive air coefficient and pressure and temperature on the characteristic of NO_x emission in the combustor.According as the results of analyzing, increased the flux of the frontal air can obviously improve the state of combustion in the flue gas generator and control the area of high-temperature zone and decrease the NO_x emission; the total pressure loss would fall during the transition of workload and the NO_x emission would decrease accordingly; in the case of medium and low workload, the flue gas generator can steadily work, the flame was short and the temperature distribution of outlet was more uniform and the NO_x emission was little. These conclusions can effectively guide the manufacture of this flue gas generator and assist in optimizing the flow field and decreasing the NO_x emission.

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Industrial thermal equipment
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