Performance Optimization And Thermo Acoustic Analysis Of Micro Combustor

Micro-scale energy device is a kind of micro-scale device which can provide power or power,and it is becoming more and more important in defense,hospital,military and people’s livelihood.Micro-scale photoelectric device as a micro-scale energy device,the principle of heating by burning effect of micro-scale burner,scale combustion heat release a large amount of light energy further photoelectric switch.It has the characteristics of high life,high energy density and quiet.It is these advantages that have attracted the attention of many researchers.As a key part of micro-scale photoelectric system,micro-scale burner determines the energy conversion efficiency of the whole micro-scale photoelectric effect.A large number of literature documents,micro-scale burner temperature ascend and temperature homogenization is beneficial to promote the efficiency of energy conversion,so how to improve the surface temperature of the burner to become a focus in the study of this article.Thermal-acoustic oscillation is now a common phenomenon in combustion.The presence of noise increases the perturbation in combustion,which further may cause the extinction of the combustion process.Therefore,noise has an effect on the thermal reaction rate,fluid pressure and velocity of the combustion process.An unstable thermal response rate increases the appearance of noise.As far as the author knows,no literature has been designed to study the influence of heat and sound in micro-scale burner.It is mentioned in the previous literature that adding the rib to the micro-scale burner can effectively improve the wall temperature of the micro-scale burner,thus improving the power generation efficiency of the micro-scale photoelectric system.However,the heat loss of the burner is still relatively large,and the outlet fluid still has a high temperature,and the burner is named modle(a).The first type of burner designed in this paper adds a rib to the outlet to enhance the heat transfer effect.The burner is named modle(b).The second burner,based on modle(b),adds another rib to the burner,named modle(c).In this paper,hydrogen-oxygen is used as a hybrid fuel and Fluent as the computing platform.The numerical results show that the modle(c)burner has the highest energy efficiency and the lowest heat loss.Modle(b)is higher than the modle(a)energy efficiency in the case of low oil combustion.In other working conditions,modle(b)has a higher thermal loss than that of modle(a).Based on the modle(a),the influence of imported combustion oscillation on microscale combustion is studied.In this paper,the flame transfer function method is used to determine the resonant frequency of modle(a)near 1000 Hz frequency.In this paper,the influence of the combustion process of micro-scale burner on the combustion process of micro-scale burner is studied by 300 Hz and 1000 Hz respectively.In this paper,Fluent is the computing platform.The numerical results show that the micro-scale burner has higher noise and the fluid flow is more chaotic in 1000 Hz combustion frequency.However,in the case of 1000 Hz disturbance frequency,micro-scale burner combustion has higher disturbance stability and higher combustion efficiency.