Study On Microscale Heat Transfer Flow And Multi-field Synergy Mechanism For Regenerative Micro-combustor

In recent years, with the rapid development of electronic products andmicro-execution devices, micro-energy supply system with high energy density has animportant role in social development. With the development of the micro-powerelectromechanical systems, micro-miniature devices and other micro-devices,micro-devices has becoming more and more important in many areas, deviceminiaturization and development of micro-systems become an important issue intoday’s research. However, the research and development of micro-power energysystem meet many problems, such as micro-burner manufacturing materials developedin recent years requires a strong high-temperature performance, refractory ceramic,such as silicon nitride(Si3N4) and silicon carbide(SiC), has many advantages, it can beadapted in a wide temperature range, those materials is not easily deformed and canwithstand the mechanical stress. There are also some problems such as inadequatemixing and combustion of fuel because of the short residence time, surface-to-volumeratio increased rapidly on account of micro-engine volume reduction and so on. Theincrease of surface-to-volume ratio will cause great heat loss, it will reduce theefficiency of micro-engine combustor and affects the stability of fuel combustion.Only effective solution to these problems can make ensure that micro-energy powersystems can be applied as soon as possible on a real project.The paper based on the micro-combustion research at home and abroad, deeplyanalyzed and researched the relevant technology of micro-combustor. The paperresearch the working conditions and various aspects of performance ofmicro-combustor by using three-dimensional numerical simulation, also analyzed thefield synergy, and researched combustion, these provide a reference basis for researchof micro-combustion. The main innovation of the paper and research work as follows:(1)Established micro-combustor catalytic hydrogen mathematical model ofmicro-turbine engine, simulated and analyzed the combustion of micro-turbine engine,researched the combustion characteristics and laws of micro-turbine engine.(2)Established micro-combustor model of micro-turbine engine byfluid-structure coupling method, carried on numerical simulation of micro-combustor,received the law that how convective heat transfer coefficient affect the temperaturedifference between the micro-burner and the wall of the combustion chamber. (3)Analyzed micro-combustor model of micro-turbine engine by usingmulti-field synergy method, reveals the law that thermal efficiency ofmicro-combustor is best when the synergy between the velocity field and temperaturegradient field is optimal.