| In order to alleviate the pressure of oil supply and reduce CO2 emissions,aviation industry seeks and develops various renewable clean energy continually.In the second generation of bio-fuels,aquatic algae have been widely concerned because of its outstanding advantages.However,there is little research on the basic combustion characteristics of microalgae bio-jet fuel in China.Therefore,this paper intends to carry out the research on the laminar combustion characteristics of microalgae bio-jet fuel.In this paper,some laminar combustion characteristics of microalgae oil/RP-3 aviation kerosene blended fuel have been carried out in a constant volume combustion experimental device with initial temperatures of 420,450 and 480 K,initial pressures of 0.1,0.2 and 0.3 MPa,microalgae oil mixing ratios of 0,0.1,0.3 and 0.5,and equivalence ratios of 0.8-1.4.Based on the experimental data the effects of microalgae oil mixing ratio,initial temperature,initial pressure and equivalence ratio on the flame propagation process,combustion instability and laminar burning velocity of the microalgae oil/RP-3 mixed fuel were analyzed.The results show that microalgae oil can accelerate the stretched flame propagation speed;the increase of initial temperature has little effect on the flame development characteristics,but it can promote the formation of flame front and increase the stretched flame propagation speed;the increase of initial pressure can also promote the formation of flame front,with the increase of the initial pressure,the stretched flame propagation speed decreases;the Markstein length of the mixed fuel decreases with the increase of the equivalence ratio,compared with RP-3 aviation kerosene,the Markstein length of the mixed fuel decreases more significantly with the increase of equivalence ratio;at the same equivalence ratio,with the increase of the initial temperature and pressure,the Markstein length of the mixed fuel decreases and combustion flame stability became worse.with the increase of the equivalence ratio,the laminar burning velocity of the mixed fuel increases first and then decreases.The peak velocity appears around the equivalence ratio of 1.1,and increases with the increase of the microalgae oil mixing ratio and initial temperature,and decreases with the increase of initial pressure. |
