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Combustion Science and Technology Volume 193, 2021 - Issue 2: ICDERS 2019
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Research Article

Reactivity of CO/H2/CH4/Air Mixtures Derived from In-Cylinder Fuel Reformation Examined by a Micro Flow Reactor with a Controlled Temperature Profile

Yuki Murakamia Institute of Fluid Science, Tohoku University, Sendai, Miyagi, Japan;b Graduate School of Engineering, Tohoku University, Sendai, Miyagi, JapanCorrespondence[email protected]
ORCID Iconhttps://orcid.org/0000-0001-8103-295XView further author information
ORCID Icon,
Hisashi Nakamuraa Institute of Fluid Science, Tohoku University, Sendai, Miyagi, JapanView further author information
,
Takuya Tezukaa Institute of Fluid Science, Tohoku University, Sendai, Miyagi, JapanView further author information
,
Go Asaic Yanmar Co., Ltd., Maibara, Shiga, JapanView further author information
&
Kaoru Marutaa Institute of Fluid Science, Tohoku University, Sendai, Miyagi, Japan;d International Combustion and Energy Laboratory, Far Eastern Federal University, Vladivostok, RussiaView further author information
Pages 266-279 | Received 13 Dec 2019, Accepted 08 Oct 2020, Published online: 24 Nov 2020

Figures & data

Figure 1. (a) Combustion conditions of conventional diesel engines and in-cylinder fuel reforming engines described onɸ-T diagram (Kamimoto, Citation1988; Akihama, Citation2014) and (b) A conceptual scheme of in-cylinder fuel reforming engine

Figure 1. (a) Combustion conditions of conventional diesel engines and in-cylinder fuel reforming engines described onɸ-T diagram (Kamimoto, Citation1988; Akihama, Citation2014) and (b) A conceptual scheme of in-cylinder fuel reforming engine

Figure 2. (a) Computed mole fractions of CO, H2, CH4 and C2H4 produced in fuel reforming of n-tridecane/air mixtures after one cycle of piston compression-expansion strokes in an engine cylinder at adiabatic condition (Murakami, Citation2017) and (b) Computed maximum gas temperatures during the fuel reforming process

Figure 2. (a) Computed mole fractions of CO, H2, CH4 and C2H4 produced in fuel reforming of n-tridecane/air mixtures after one cycle of piston compression-expansion strokes in an engine cylinder at adiabatic condition (Murakami, Citation2017) and (b) Computed maximum gas temperatures during the fuel reforming process

Figure 3. A ternary diagram indicating mixture conditions experimentally investigated for the reactivity of CO2/CH4 mixtures in the present and earlier studies (Gersen, Citation2012; Mathieu, Citation2013, Citation2015; Mansfield, Citation2015; Liu, Citation2018)

Figure 3. A ternary diagram indicating mixture conditions experimentally investigated for the reactivity of CO2/CH4 mixtures in the present and earlier studies (Gersen, Citation2012; Mathieu, Citation2013, Citation2015; Mansfield, Citation2015; Liu, Citation2018)

Figure 4. Schematic of a micro flow reactor with a controlled temperature profile

Figure 4. Schematic of a micro flow reactor with a controlled temperature profile

Table 1. Mole fractions of mixture components investigated in the present study. Shaded conditions indicate the mixtures considered in both experiments and computations. Non-shaded conditions indicate the mixtures considered only in computations

Figure 5. Normalized fractions of CO, H2 and CH4 plotted along equivalence ratio conditions for in-cylinder fuel reforming at 530 K (the initial gas temperature for in-cylinder fuel reforming)

Figure 5. Normalized fractions of CO, H2 and CH4 plotted along equivalence ratio conditions for in-cylinder fuel reforming at 530 K (the initial gas temperature for in-cylinder fuel reforming)

Figure 6. The measured wall temperatures of the reactor and the estimated wall temperature profile used in the computation

Figure 6. The measured wall temperatures of the reactor and the estimated wall temperature profile used in the computation

Figure 7. Weak flame images of CO/H2/CH4 = 50/50/0, 50/45/5, 50/25/25 and 50/0/50 obtained in the experiment

Figure 7. Weak flame images of CO/H2/CH4 = 50/50/0, 50/45/5, 50/25/25 and 50/0/50 obtained in the experiment

Figure 8. Comparison of weak flame locations of the stoichiometric CO/H2/CH4 mixtures between the experimental measurements (Black plots) and the computational predictions (Colored lines). The uncertainty of the wall temperature at a flame location is less than 5 K

Figure 8. Comparison of weak flame locations of the stoichiometric CO/H2/CH4 mixtures between the experimental measurements (Black plots) and the computational predictions (Colored lines). The uncertainty of the wall temperature at a flame location is less than 5 K

Figure 9. Computed ignition delay times of stoichiometric CO/H2/CH4/air mixtures at atmospheric pressure and initial temperatures of 800-1600 K by HPmech

Figure 9. Computed ignition delay times of stoichiometric CO/H2/CH4/air mixtures at atmospheric pressure and initial temperatures of 800-1600 K by HPmech

Figure 10. Rate of OH production for the cases of CO/H2/CH4 = 50/50/0, 50/45/5, 50/25/25 and 50/0/50. (Negative value indicates consumption.)

Figure 10. Rate of OH production for the cases of CO/H2/CH4 = 50/50/0, 50/45/5, 50/25/25 and 50/0/50. (Negative value indicates consumption.)

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