Laser-induced fluorescence of ketones at elevated temperatures for pressures up to 20 bars by using a 248 nm excitation laser wavelength: experiments and model improvements.
Laser-induced fluorescence of ketones at elevated temperatures for pressures up to 20 bars by using a 248 nm excitation laser wavelength: experiments and model improvements.
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DOI：
10.1364/ao.45.004982
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发表时间：
2006-07
期刊：
影响因子：
1.9
通讯作者：
A. Braeuer;F. Beyrau;A. Leipertz
中科院分区：
文献类型：
--
作者：
A. Braeuer;F. Beyrau;A. Leipertz
研究了丙酮和3-戊酮在248 nm激发波长下的激光诱导荧光，并在内燃机温度、压力和气体组成等条件下进行了研究。通过使用CO2和空气作为浴气来操作具有连续气流的光学可访问校准室。根据火花点火发动机压缩冲程中压力和温度的变化情况，在293 ~ 700 K的不同温度下，在1 ~ 20 bar的等温压力变化下进行了荧光实验。发现基于Thurber等人先前开发的模型[Appl.Opt.37，4963（1998）]的酮荧光行为预测过高估计了高温和248 nm处小波长激发的压力相关荧光增加。对仅在大振动能区影响模型的参数进行了新的调整，得到了与实验更符合的改进模型。该模型的有效性激发在较大的波长不受影响。对于空气浴气体的额外的碰撞和振动能量敏感的淬灭速率中实施的两个示踪剂，丙酮和3-戊酮的模型。
Laser-induced fluorescence of acetone and 3-pentanone for a 248 nm excitation wavelength was investigated for conditions relevant for internal combustion engines regarding temperature, pressure, and gas composition. An optically accessible calibration chamber with continuous gas flow was operated by using CO2 and air as a bath gas. According to the varying pressure and temperature conditions during the compression stroke of a spark ignition engine, fluorescence experiments were performed under isothermal pressure variations from 1 to 20 bars for different temperatures between 293 and 700 K. The ketone fluorescence behavior predictions, based on a model previously developed by Thurber et al. [Appl. Opt. 37, 4963 (1998)], were found to overestimate the pressure-related fluorescence increase for high temperature and small wavelength excitation at 248 nm. The parameters influencing the model only in the large vibrational energy regime were newly adjusted, which resulted in an improved model with a better agreement with the experiment. The model's validity for excitation at larger wavelengths was not influenced. For the air bath gas an additional collision and vibrational energy sensitive quenching rate was implemented in the model for both tracers, acetone and 3-pentanone.