Effects of water addition on the combustion of iso-octane investigated in laminar flames, low-temperature reactors, and an HCCI engine
Effects of water addition on the combustion of iso-octane investigated in laminar flames, low-temperature reactors, and an HCCI engine
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DOI：
10.1016/j.combustflame.2019.11.023
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发表时间：
2020-02
影响因子：
4.4
通讯作者：
Steffen Schmitt;Maximilian Wick;Christian Wouters;L. Ruwe;Isabelle Graf;J. Andert;N. Hansen;S. Pisc
中科院分区：
文献类型：
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作者：
Steffen Schmitt;Maximilian Wick;Christian Wouters;L. Ruwe;Isabelle Graf;J. Andert;N. Hansen;S. Pisc
为了更好地了解水添加量作为发动机HCCI燃烧控制参数的适用性，研究了水喷射对异辛烷燃烧过程的影响。几个实验相结合，包括预混合的低压火焰，射流搅拌反应器（JSR）和活塞流反应器（PFR），都在大气压力下，和单缸研究发动机（SCRE）与任一异辛烷或罗恩98汽油操作。在层流预混异辛烷/O2/Ar火焰（当量比Φ=1.4，40 mbar）中测定了水的热效应，水的摩尔分数为0 ~ 0.22，其中水的加入使激光诱导荧光（LIF）测量的温度降低了110 K。从这些火焰以及JSR（Φ=0.65，933 mbar）和PFR实验（Φ=0.65，970 mbar）中获得了在700-1100 K的低至中温范围内添加和不添加H2O的形态数据。在这些火焰和反应器实验中的化学分析是使用分子束质谱法（MBMS），采用电子电离（EI）的PFR和预混火焰或单光子电离（PI）的可调真空紫外辐射的JSR。对物种摩尔分数的影响是小的，这是支持从化学动力学模拟预测。利用傅里叶变换红外光谱（FTIR）获得了SCRE废气的定量形态数据。在实验室规模的实验和发动机运行中检测到非常相似的物种库。因此，假设这些结果可以帮助指导基本化学动力学以及HCCI发动机控制模型的改进。
The effect of H2O injection on the combustion process ofiso-octane was investigated with the aim to better understand the suitability of water addition as a potential engine control parameter for homogeneous-charge compression ignition (HCCI) combustion. Several experiments were combined including premixed low-pressure flames, a jet-stirred reactor (JSR) and a plug-flow reactor (PFR), both at atmospheric pressure, and a single-cylinder research engine (SCRE) operated with eitheriso-octane or RON 98 gasoline. The thermal effect of H2O addition was determined in laminar premixediso-octane/O2/Ar flames (equivalence ratio Φ=1.4, 40 mbar) with H2O mole fractions of 0 to 0.22, where water addition reduced the temperature measured by laser-induced fluorescence (LIF) by up to 110 K. Speciation data were obtained from these flames as well as in the JSR (Φ=0.65, 933 mbar) and PFR experiments (Φ=0.65, 970 mbar) with and without H2O addition in the low- to intermediate temperature regime from 700–1100 K. The chemical analysis in these flame and reactor experiments was performed using molecular-beam mass spectrometry (MBMS) employing either electron ionization (EI) in the PFR and premixed flame or single-photon ionization (PI) by tunable vacuum-ultraviolet radiation in the JSR. The effects on species mole fractions were small which is supported by predictions from chemical-kinetic simulations. Quantitative speciation data of the exhaust gas of the SCRE were obtained by using Fourier-transform infrared (FTIR) spectroscopy. A very similar species pool was detected in the laboratory-scale experiments and for the engine operation. It is thus assumed that these results could assist in guiding both the improvement of fundamental chemical-kinetic as well as HCCI engine control models.