Quantum cascade laser assisted time-resolved measurements of carbon dioxide absorption during combustion in DME-HCCI engine

FUEL

卷:182

Article

Azimov, Ulugbek¹  Kawahara, Nobuyuki²  Tomita, Eiji² 

[1] Northumbria Univ, Dept Mech & Construct Engn, Wynne Jones Ctr, City Campus,Room 305, Newcastle Upon Tyne NE1 8ST, Tyne & Wear, England

[2] Okayama Univ, Dept Mech Engn, Tsushima Naka 3, Okayama 7008530, Japan

关键词: HCCI;    IC engine combustion;    Dimethyl ether;    CO2 infrared light absorption;    Heat release rate;    Quantum cascade laser;   

DOI  :  10.1016/j.fuel.2016.06.040

来源: Elsevier

【 摘 要 】

We conducted experiments to investigate in-cylinder light absorption by carbon dioxide (CO2) during homogeneous charge compression ignition (HCCI) engine combustion. The combustion was fuelled with dimethyl ether. An in situ laser infrared absorption method was developed. We used an optical fibre spark plug sensor and the light source was a 4.301 mu m quantum cascade laser (QCL). We applied Lambert Beer's law in the case of a single absorption line of CO2. We were able to measure the transient CO2 formation during the HCCI combustion inside the engine cylinder. Our experiments showed that the laser light transmissivity level decreased with the intensity of the infrared (IR) signal. We compared the change in the transmissivity to the spatially integrated HCCI flame luminosity level and observed significant correlations between the flame luminosity level, heat release rate and transmissivity. Time-resolved experiments showed that the CO2 absorbance increases when the second peak of the rate of heat release (ROHR) is maximised. After combustion, the CO2 concentration was approximately 4 vol%, which agrees with the amount of CO2 formed during complete combustion. (C) 2016 Elsevier Ltd. All rights reserved.

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