Experimental Study on Spectral Characteristics of Kerosene Swirl Combustion
An experimental study has been conducted to investigate characteristics of emission spectra from combustion of kerosene liquid fuel,i.e.,Jet A-1.Radicals of interest in hydrocarbon combustion are OH*,CH*,and C2*.Therefore,an experimental study about chemiluminescence characteristics of liquid fuel combustion has been devised to investigate emission characteristics depending on various operating parameters including inlet air temperature,swirl strength and equivalence ratio.A swirl combustor is designed and fabricated for providing similar environments to those of actual liquid rocket engines.The model combustor has a central fuel injector making a hollow cone spray with a spray angle of 80 degrees,which is surrounded by swirling flow.Kerosene flame exhibited highly luminous characteristics being attributed to CO2* chemiluminescence.OH* and CH* chemiluminescence intensities show a very similar trend as a function of equivalence ratio.And their intensities decrease along with an increase in equivalence ratio.Overall intensity values increase with an increase of inlet air temperature due to enhanced reaction rates producing the radicals.The chemiluminescence intensity ratios between these two radicals show very close values to one regardless of equivalence ratio and inlet air temperature.C2* chemiluminescence intensity reveals relatively strong relations with equivalence ratio compared to CH* and OH*.Its intensity values increase as mixture becomes rich and also an increase in inlet air temperature enhances its intensities.The ratios between C2* and CH* manifest a linear relation as a function of equivalence ratio.Enhanced degree of mixing expected from stronger swirl results in a decrease of gradients of C2* and CH* intensity ratio.Future research including the variations of fuel mass flow rate to investigate emission characteristics at different heat release rate from flame might allow us to better understand emission characteristics and its applicability for practical use,i.e.,the development of an optical sensor for the measurement of combustion heat release rate.
Kerosene Combustion Chemiluminescsence Emission Spectra Swirl Heat Release Rate Liquid Fuel
Hyeonjae Lee Seonghyeon Seo
Department of Mechanical Engineering,Hanbat National University,Daejeon 305-719,South Korea
国际会议
2014 Asia-Pacific International Symposium on Aerospace Technology(2014亚太航空航天技术学术会议)
上海
英文
1-9
2014-09-24（万方平台首次上网日期，不代表论文的发表时间）