传热对脉动燃烧稳定性影响的研究化工过程机械专业论文.docxVIP

ABSTRACTMicro-burner ABSTRACT Micro-burner iS the core component of power micro electromechanical systems and the existing micro-burner are developed on continuous combustion．Where the microscale effects，cause problems like combustion instability,incomplete combustion，low combustion efficiency and thermal efficiency，and higll pollutant emissions．Pulse combustion has the advantage of high efficiency and intensity,hi曲thermal efficiencyj low pollution emission，which may be applied to overcome the existing problems of the micro·combustor．In this thesis，a micro-pulsating combustion technology concept WaS proposed and its feasibility Was verified through experimental study． This paper aimed at Rijke pulse combustor of small diameter and study operation frequency，tability,signal to noise ratio and heat transfer characteristic in different heat transfer condition．From the experiment we get follow results： 1．剐ke pulse combustor can work only ifthe follow criteria arc satisfied：combustion position is the half boRom of tube，gas velocity in the tube must get a specific value， combustion thermal must arrive at specific intensity． 2．Among operation process frequency hopping is happened in pulse combustor and the heat transfer in the bottom of tube Call increase frequency content．According to frequency characteristic，the operation condition call classify to four parts：low-frequency region，high—frequency region,high harmonic region，turbulence region．Quartz tube pulse combustor in turbulence region may appear flameout，but the stainless steel tube pulse combustor did not happen this phenomenon． 3．Experiment plot the stability figure of pulse combustor in different tube diameter, heat transfer condition and burner height．The figure show that：the smaller the tube diameter,the lower the combustion position is，the range of gas flux is more，and the operation is more stable．As the heat transfer out of the Rijke tube increase，the mininlunl flux of propane needed for oscillation starti