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Kaoru Maruta
Tohoku University
156Publications
36H-index
4,180Citations
Publications 147
Newest
#1Philipp Grajetzki (Tohoku University)H-Index: 2
#2Takahiro Onda (Tohoku University)H-Index: 1
Last.Kaoru Maruta (Tohoku University)H-Index: 36
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Abstract The chemical and dilution effects of the major exhaust gas recirculation constituents N2, CO2 and H2O on the reactivity of iso-octane/air and n-heptane/air mixtures were investigated by separated weak flames in a micro flow reactor with a controlled temperature profile. Experimental results showed that high dilution ratios of 20% and 50% of N2 and CO2 shifted the blue flame (reactions of intermediate species) as well as the hot flame (reactions of the hydrogen/oxygen-system and CO) to h...
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#1Takahiro Onda (Tohoku University)H-Index: 1
#2Hisasi Nakamura (Tohoku University)H-Index: 48
Last.Kaoru Maruta (Tohoku University)H-Index: 36
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Abstract To examine methane oxidation at intermediate temperatures (ca., 900–1200 K), chemiluminescence observation and laser-induced fluorescence (LIF) measurements for CH2O and OH were conducted for methane weak flames in a micro flow reactor with a controlled temperature profile (MFR) at atmospheric and elevated pressures. Locations of CH2O–LIF, chemiluminescence, and OH-LIF in MFR were arranged from the low temperature side at 1.0 and 5.0 bar. Spatial separation of methane oxidation was succ...
1 CitationsSource
#1Ajit Kumar Dubey (Tohoku University)H-Index: 1
#2Takuya Tezuka (Tohoku University)H-Index: 14
Last.Kaoru Maruta (Tohoku University)H-Index: 36
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Abstract Aromatic formation in methane combustion is still not well understood. The first step to build kinetic models for aromatic formation is to understand fuel-rich oxidation and formation of aromatic precursors like acetylene and ethylene in varied temperature and equivalence ratio conditions. This understanding is also useful to optimize partial oxidation of methane in fuel-rich conditions. With this view, the current work presents investigation of fuel-rich but non-sooting premixed methan...
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#1Philipp Grajetzki (Tohoku University)H-Index: 2
#2Hisasi Nakamura (Tohoku University)H-Index: 48
Last.Kaoru Maruta (Tohoku University)H-Index: 36
view all 5 authors...
Abstract The reactivities of n-heptane, n-pentane, PRF50, PRF80, iso-pentane and iso-octane were investigated by separated weak flames in a micro flow reactor with a controlled temperature profile at a pressure of 500 kPa. At this elevated pressure condition, low-temperature reactions in the cool flame and blue flame were enhanced. High temperature reactions in the hot flame became weaker and independent of the base fuel as they mainly consist of CO and hydrogen–oxygen reactions. By conducting s...
1 CitationsSource
#1Shintaro Takahashi (Tohoku University)H-Index: 5
#2Hisasi Nakamura (Tohoku University)H-Index: 48
Last.Kaoru Maruta (Tohoku University)H-Index: 36
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Abstract Oxidation of CH2F2 (R32), a widely used refrigerant, was investigated experimentally and computationally using a micro flow reactor with a controlled temperature profile (MFR). Specifically, we examined weak flames of a stoichiometric CH2F2/air mixture in MFR observed at low flow velocities. In the case of the maximum wall temperature of 1300 K, weak flames showed two luminous regions at 1240 and 1290 K, implying two-stage oxidation. Computations also indicated two-stage heat release. C...
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#1Ryan J. Milcarek (ASU: Arizona State University)H-Index: 8
#2Hisasi Nakamura (Tohoku University)H-Index: 48
Last.Jeongmin Ahn (SU: Syracuse University)H-Index: 17
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Abstract Flame-assisted fuel cell (FFC) studies have been limited to lower fuel-rich equivalence ratios (∼1–1.7, due to the upper flammability limit and sooting limit) where only small concentrations of H 2 and CO can be generated in the exhaust. In this work, a non-catalytic microcombustion based FFC is proposed for direct use of hydrocarbons for power generation. The potential for high FFC performance (450 mW cm −2 power density and 50% fuel utilization) in propane/air microcombustion exhaust ...
1 CitationsSource
#1Sui Wan (UTokyo: University of Tokyo)H-Index: 1
#2Yong Fan (UTokyo: University of Tokyo)H-Index: 5
Last.Yuji Suzuki (UTokyo: University of Tokyo)H-Index: 31
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Abstract Wall chemical effect on DME/air weak flames ( U in = 1.5 cm/s, ϕ = 0.85) was investigated using a micro flow reactor with a streamwise temperature gradient experimentally. The quartz channel used in this study has a rectangular cross-section of 1.5 × 5 mm, which offers a good optical access for the planar laser-induced fluorescence (PLIF) measurement. The walls can be replaced for examining wall chemical effects of different wall materials. Wall surface materials, quartz, SiC, type 321 ...
1 CitationsSource
#1Mohd Hafidzal Mohd Hanafi (UTeM: Universiti Teknikal Malaysia Melaka)H-Index: 2
#2Hisasi Nakamura (Tohoku University)H-Index: 48
Last.Kaoru Maruta (Far Eastern Federal University)H-Index: 36
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ABSTRACTEffects of n-butanol addition on the sooting tendency and formations of C1 and C2 primary intermediates of n-heptane/air mixtures were studied in a micro flow reactor with a controlled temperature profile. Sooting tendency was investigated over equivalence ratios of 1.5–4.0 at a maximum wall temperature of 1300 K. Experimental observations indicated two types of flames: a flame alone (type I) or a flame with soot (type II). The critical sooting equivalence ratio, at which the flame switc...
1 CitationsSource
#1Philipp Grajetzki (Tohoku University)H-Index: 2
#2Hisasi Nakamura (Tohoku University)H-Index: 48
Last.Kaoru Maruta (Tohoku University)H-Index: 36
view all 5 authors...
ABSTRACTThe reactivity of ultra-lean primary reference fuel (PRF)/air mixtures was investigated by weak flames in a vertical-type micro flow reactor (MFR) with a controlled temperature profile. In experiments, steady-separated weak flames were obtained at equivalence ratios between 0.5 and 1.0 for PRF80, 90, and 100. At leaner conditions, all the fuels showed hot flames at lower temperature regions, indicating higher reactivity. In one-dimensional steady simulations of the present micro flow rea...
2 CitationsSource
#1Tomoya Okuno (Tohoku University)H-Index: 2
#2Takaki Akiba (Tohoku University)
Last.Kaoru Maruta (Tohoku University)H-Index: 36
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Abstract To examine the effect of Lewis number on the extinction boundary, flame regimes, and the formation of sporadic flames, microgravity experiments on counterflow flames for CH4/O2/Kr (Le ≈ 0.7–0.8) and CH4/O2/Xe (Le ≈ 0.5) mixtures, and three types of computations, which are one-dimensional computations with a PREMIX-based code using detailed chemistry, and three- and one-dimensional computations with the thermal-diffusion model using an overall one-step reaction were conducted. In the mic...
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