Study On The Combustion Characteristics Of 2-ethylfuran

Biomass liquid fuel is a renewable energy with potential applications.The application of biomass liquid fuel is helpful to achieve the goal of"carbon peak and carbon neutrality".2-Ethylfuran is a kind of furan biomass liquid fuel.The study of laminar burning characteristics,flame instability and mechanism reduction provides technical support for the application of 2-Ethylfuran in the industrial field.In this paper,through the experimental system with a constant volume combustion chamber as the core,laminar burning characteristics of 2-Ethylfuran spherically expanding flame at the elevated temperatures（373 K,403 K and 433 K）and pressures（1 bar,2 bar and 4 bar）with equivalence ratio ranging from 0.7 to 1.4.The linear stability theory is used to calculate the flame cellularization instability of 2-Ethylfuran,and the detailed chemical reaction mechanism is simplified by the CHEMKIN software.The main contents are as follows:First,through the experimental system with the constant volume combustion chamber,the flame images of combustion processes are recorded,and the laminar burning speed,Markstein length and Markstein number under the experimental conditions are calculated.The increase in the initial temperature rises the laminar burning speed,and the increase of the initial pressure reduces the laminar burning speed;the Markstein number and the Markstein length have similar trends,and the overall decrease as the equivalence ratio increases.Second,according to the linear stability theory,the critical peninsula curve,disturbance growth rate and instability parameters(such as expansion ratio（σ）,flame thickness（δ）,the effective Lewis number(Le_eff)and critical Lewis number（Le₀）,etc.)of 2-Ethylfuran under experimental conditions are calculated.The calculation results show that the critical peninsula curve of the flame is very sensitive to the increase of the initial temperature;the hydrodynamic instability is the inherent instability of the flame,and the thermal-diffusion effect can maintain the stability of the flame surface.Thirdly,the mechanism reduction methods DRG and DRGEP are used to simplify the detailed chemical mechanism.Compared with the detailed chemical mechanism,the elementary substances in skeletal mechanism are reduced by more than 70%,and the elementary reaction is reduced by more than 65%.The average deviation of the laminar burning velocity calculated from the detailed mechanism and skeletal mechanism is less than 3%.