Study On Field Synergy Optimization Of The Methane/Air Premixed Combustion Process In The Micro-Combustor

With the development of economy, energy shortage becomes more and more obvious, looking for high efficiency combustor has become the development direction of scientists, and has multiple advantages of micro scale combustion has received wide researchers' attention all over the world. Micro scale combustion is the fuel combustion reaction in micro space. Research on micro-combustion involves multiple disciplines including heat transfer theory, combustion theory, and chemical reaction dynamics and so on. Different from the conventional spatial scale combustion, the combustion stability, combustion efficiency, heat loss and combustion characteristics are very different.Therefore, numerical simulation was used to study t he work condition and combustion properties of methane step type, the field synergy of micro combustor was analyzed, the combustor chamber and the step-angle is optimized, and the combustion chamber and the step-angle was optimized by multidisciplinary design optimization theory, which will provide reference value for research of micro combustor. The main innovation and research work in the paper were expressed as follows:(1)A mathematical model of methane combustion ladder type micro combustor was established, and the methane combustion of micro combustor in different entrance velocities, wall materials and different burner structure s was simulated and analyzed, which researched the methane combustion characterist ics and law of micro combustor.(2)A micro-combustor model of step type was analyzed by multi-field synergy method, the law that thermal efficiency of micro-combustor was the best was revealed when the synergy between the velocity vector field and temperature gradient field was optimal, and the influence of different entrance velocity and excess air coefficient on the combustion temperature fields were obtained.(3)The multidisciplinary design optimization model was established with the objective function of the combustor chamber length and step-angle of micro combustor. Adaptive chaos optimization algorithm was used to solve weights factor of multi-disciplinary design optimization. The results show that the combustion performance of micro combustor after optimization was greatly improved.