Temperature measurements under diesel engine conditions using laser induced grating spectroscopy
Temperature measurements under diesel engine conditions using laser induced grating spectroscopy
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DOI：
10.1016/j.combustflame.2018.10.017
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发表时间：
2019-01-01
影响因子：
4.4
通讯作者：
Ewart, P.
中科院分区：
文献类型：
--
作者：
Forster, F.;Crua, C.;Ewart, P.
利用激光诱导光栅光谱法（LIGS）在模拟柴油机工况的往复压缩机上测量了曲轴转角分辨温度。使用基于脉冲Nd：YAG激光器的便携式LIGS系统，基波发射在1064 nm，四次谐波在266 nm，具有连续波。二极管泵浦的固体激光器作为660 nm的探针。采用激光诱导热光栅散射（LITGS）技术，以1-甲基萘作为替代燃料，对266 nm泵浦光进行共振吸收，测量了非燃烧循环中的温度。采用1064 nm泵浦光的激光诱导电致伸缩光栅散射（LIEGS）测量了燃烧和非燃烧循环的温度，其测量结果与LITGS测量结果吻合良好，其单次测量精度为15 K，标准误差为+/-1.5K。的准确性估计为3 K的基础上，在使用的推导从LIGS测量气体中的声速的修改后的状态方程中涉及的不确定性。燃烧和非燃烧循环之间缸内气体温度的差异被明确地解决，并且在单个循环中记录了2300 +/-100 K的温度，这是火焰的典型温度。结果证实了基于LIGS的测温技术在压燃条件下用于高精度燃烧测温的潜力。(C)2018作者爱思唯尔公司出版代表燃烧研究所这是CC BY-NC-ND许可下的开放获取文章。(http：//creativecommons.org/licenses/by-nc-nd/4.0/）
Crank angle-resolved temperatures have been measured using laser induced grating spectroscopy (LIGS) in a motored reciprocating compression machine to simulate diesel engine operating conditions. A portable LIGS system based on a pulsed Nd:YAG laser, fundamental emission at 1064nm and the fourth harmonic at 266 nm, was used with a c.w. diode-pumped solid state laser as probe at 660 nm. Laser induced thermal grating scattering (LITGS) using resonant absorption by 1-methylnaphthalene, as a substitute fuel, of the 266 nm pump-radiation was used for temperature measurements during non-combusting cycles. Laser induced electrostrictive grating scattering (LIEGS) using 1064nm pump-radiation was used to measure temperatures in both combusting and non-combusting cycles with good agreement with the results of LITGS measurements which had a single-shot precision off 15K and standard error of +/- 1.5 K. The accuracy was estimated to be 3 K based on the uncertainty involved in the modified equation of state used in the derivation from the LIGS measurements of sound speed in the gas. Differences in the in-cylinder bulk gas temperature between combusting and non-combusting cycles were unambiguously resolved and temperatures of 2300 +/- 100K, typical of flames, were recorded in individual cycles. The results confirm the potential for LIGS-based thermometry for high-precision thermometry of combustion under compression-ignition conditions. (C) 2018 The Authors. Published by Elsevier Inc. on behalf of The Combustion Institute. This is an open access article under the CC BY-NC-ND license. (http://creativecommons.org/licenses/by-nc-nd/4.0/)