Akihiro Hayakawa

2022

Effects of initial mixture temperature and pressure on laminar burning velocity and Markstein length of ammonia/air premixed laminar flames

Kanoshima, R., Hayakawa, A., Kudo, T., Okafor, E. C., Colson, S., Ichikawa, A., Kudo, T. & Kobayashi, H., 2022 2月 15, In: Fuel. 310, 122149.

研究成果: Article › 査読

15 被引用数 (Scopus)

Effects of Water Vapor Dilution on the Laminar Burning Velocity and Markstein Length of Ammonia/Water Vapor/Air Premixed Laminar Flames

Hayashi, M., Hayakawa, A., Kudo, T. & Kobayashi, H., 2022 10月 6, In: Energy and Fuels. 36, 19, p. 12341-12349 9 p.

研究成果: Article › 査読

Evolution of N₂O production at lean combustion condition in NH₃/H₂/air premixed swirling flames

Mashruk, S., Okafor, E. C., Kovaleva, M., Alnasif, A., Pugh, D., Hayakawa, A. & Valera-Medina, A., 2022 10月, In: Combustion and Flame. 244, 112299.

研究成果: Article › 査読

Open Access

1 被引用数 (Scopus)

Experimental and numerical study of product gas and N₂O emission characteristics of ammonia/hydrogen/air premixed laminar flames stabilized in a stagnation flow

Hayakawa, A., Hayashi, M., Kovaleva, M., Gotama, G. J., Okafor, E. C., Colson, S., Mashruk, S., Valera-Medina, A., Kudo, T. & Kobayashi, H., 2022, (Accepted/In press) In: Proceedings of the Combustion Institute.

研究成果: Article › 査読

Measurement of the laminar burning velocity and kinetics study of the importance of the hydrogen recovery mechanism of ammonia/hydrogen/air premixed flames

Gotama, G. J., Hayakawa, A., Okafor, E. C., Kanoshima, R., Hayashi, M., Kudo, T. & Kobayashi, H., 2022 2月, In: Combustion and Flame. 236, 111753.

研究成果: Article › 査読

18 被引用数 (Scopus)

Nitrogen oxide emissions analyses in ammonia/hydrogen/air premixed swirling flames

Mashruk, S., Kovaleva, M., Alnasif, A., Chong, C. T., Hayakawa, A., Okafor, E. C. & Valera-Medina, A., 2022 12月 1, In: Energy. 260, 125183.

研究成果: Article › 査読

Open Access

4 被引用数 (Scopus)

Quantitative OH concentration measurement using OH(2,0) band bi-directional LIF method for high-pressure and high-temperature symmetrical flames

Higuchi, Y., Nunome, Y., Takada, S., Yoshikawa, R., Kudo, T., Hayakawa, A. & Kobayashi, H., 2022, In: Journal of Thermal Science and Technology. 17, 3, 22-00216.

研究成果: Article › 査読

Open Access

2021

Experimental and Numerical Study of NH₃/CH₄ Counterflow Premixed and Non-premixed Flames for Various NH₃ Mixing Ratios

Colson, S., Hirano, Y., Hayakawa, A., Kudo, T., Kobayashi, H., Galizzi, C. & Escudié, D., 2021, In: Combustion science and technology. 193, 16, p. 2872-2889 18 p.

研究成果: Article › 査読

8 被引用数 (Scopus)

Experimental and numerical study of product gas characteristics of ammonia/air premixed laminar flames stabilized in a stagnation flow

Hayakawa, A., Hirano, Y., Okafor, E. C., Yamashita, H., Kudo, T. & Kobayashi, H., 2021 1月, In: Proceedings of the Combustion Institute. 38, 2, p. 2409-2417 9 p.

研究成果: Article › 査読

13 被引用数 (Scopus)

Flame stability and emissions characteristics of liquid ammonia spray co-fired with methane in a single stage swirl combustor

Okafor, E. C., Yamashita, H., Hayakawa, A., Somarathne, K. D. K. A., Kudo, T., Tsujimura, T., Uchida, M., Ito, S. & Kobayashi, H., 2021 3月 1, In: Fuel. 287, 119433.

研究成果: Article › 査読

37 被引用数 (Scopus)

Laminar Burning Velocity and Markstein Length of CH₄/CO₂/Air Premixed Flames at Various Equivalence Ratios and CO₂ Concentrations Under Elevated Pressure

Anggono, W., Hayakawa, A., Okafor, E. C., Gotama, G. J. & Wongso, S., 2021, In: Combustion science and technology. 193, 14, p. 2369-2388 20 p.

研究成果: Article › 査読

7 被引用数 (Scopus)

Liquid ammonia spray combustion in two-stage micro gas turbine combustors at 0.25 MPa; Relevance of combustion enhancement to flame stability and NOx control

Okafor, E. C., Kurata, O., Yamashita, H., Inoue, T., Tsujimura, T., Iki, N., Hayakawa, A., Ito, S., Uchida, M. & Kobayashi, H., 2021 9月, In: Applications in Energy and Combustion Science. 7, 100038.

研究成果: Article › 査読

Open Access

17 被引用数 (Scopus)

Nitrogen Oxides as a By-product of Ammonia/Hydrogen Combustion Regimes

Mashruk, S., Kovaleva, M., Chong, C. T., Hayakawa, A., Okafor, E. C. & Valera-Medina, A., 2021, In: Chemical Engineering Transactions. 89, p. 613-618 6 p.

研究成果: Article › 査読

4 被引用数 (Scopus)

Stabilization mechanisms of an ammonia/methane non-premixed jet flame up to liftoff

Colson, S., Kuhni, M., Hayakawa, A., Kobayashi, H., Galizzi, C. & Escudié, D., 2021 12月, In: Combustion and Flame. 234, 111657.

研究成果: Article › 査読

2 被引用数 (Scopus)

2020

Combustion characteristics of a cavity flameholder with a burned-gas injector at the cavity bottom wall in a scramjet model combustor

Yamaguchi, T., Hizawa, T., Yugami, Y., Hasegawa, M., Kudo, T., Hayakawa, A. & Kobayashi, H., 2020, In: Transactions of the Japan Society for Aeronautical and Space Sciences. 63, 4, p. 160-171 12 p.

研究成果: Article › 査読

Open Access

1 被引用数 (Scopus)

Control of NOx and other emissions in micro gas turbine combustors fuelled with mixtures of methane and ammonia

Okafor, E. C., Somarathne, K. D. K. A., Ratthanan, R., Hayakawa, A., Kudo, T., Kurata, O., Iki, N., Tsujimura, T., Furutani, H. & Kobayashi, H., 2020 1月, In: Combustion and Flame. 211, p. 406-416 11 p.

研究成果: Article › 査読

Open Access

116 被引用数 (Scopus)

Flow field and combustion field control using pylons installed upstream of a cavity in supersonic flow

Hizawa, T., Yamaguchi, T., Murata, K., Yugami, Y., Hasegawa, M., Kudo, T., Hayakawa, A. & Kobayashi, H., 2020, In: Transactions of the Japan Society for Aeronautical and Space Sciences. 63, 2, p. 50-61 12 p.

研究成果: Article › 査読

Open Access

Turbulent burning velocity of ammonia/oxygen/nitrogen premixed flame in O₂-enriched air condition

Xia, Y., Hashimoto, G., Hadi, K., Hashimoto, N., Hayakawa, A., Kobayashi, H. & Fujita, O., 2020 5月 15, In: Fuel. 268, 117383.

研究成果: Article › 査読

Open Access

33 被引用数 (Scopus)

2019

Burning velocity and flame structure of CH ₄ /NH ₃ /air turbulent premixed flames at high pressure

Ichikawa, A., Naito, Y., Hayakawa, A., Kudo, T. & Kobayashi, H., 2019 3月 8, In: International Journal of Hydrogen Energy. 44, 13, p. 6991-6999 9 p.

研究成果: Article › 査読

43 被引用数 (Scopus)

Development of a wide range-operable, rich-lean low-NOx combustor for NH ₃ fuel gas-turbine power generation

Kurata, O., Iki, N., Inoue, T., Matsunuma, T., Tsujimura, T., Furutani, H., Kawano, M., Arai, K., Okafor, E. C., Hayakawa, A. & Kobayashi, H., 2019, In: Proceedings of the Combustion Institute. 37, 4, p. 4587-4595 9 p.

研究成果: Article › 査読

90 被引用数 (Scopus)

Emission characteristics of turbulent non-premixed ammonia/air and methane/air swirl flames through a rich-lean combustor under various wall thermal boundary conditions at high pressure

Somarathne, K. D. K. A., C. Okafor, E., Hayakawa, A., Kudo, T., Kurata, O., Iki, N. & Kobayashi, H., 2019 12月, In: Combustion and Flame. 210, p. 247-261 15 p.

研究成果: Article › 査読

60 被引用数 (Scopus)

Extinction limits of an ammonia/air flame propagating in a turbulent field

Ichimura, R., Hadi, K., Hashimoto, N., Hayakawa, A., Kobayashi, H. & Fujita, O., 2019 6月 15, In: Fuel. 246, p. 178-186 9 p.

研究成果: Article › 査読

36 被引用数 (Scopus)

Measurement and modelling of the laminar burning velocity of methane-ammonia-air flames at high pressures using a reduced reaction mechanism

Okafor, E. C., Naito, Y., Colson, S., Ichikawa, A., Kudo, T., Hayakawa, A. & Kobayashi, H., 2019 6月, In: Combustion and Flame. 204, p. 162-175 14 p.

研究成果: Article › 査読

138 被引用数 (Scopus)

OH planar laser-induced fluorescence measurement for H₂/O₂ jet diffusion flames in rocket combustion condition up to 7.0 MPa

Higuchi, Y., Takeuchi, K., Nunome, Y., Tomioka, S., Sakaki, K., Kudo, T., Hayakawa, A. & Kobayashi, H., 2019, In: Journal of Thermal Science and Technology. 14, 2, 19-00196.

研究成果: Article › 査読

Open Access

2 被引用数 (Scopus)

Quantitative measurement of temperature in oxygen enriched CH ₄ /O ₂ /N ₂ premixed flames using Laser Induced Thermal Grating Spectroscopy (LITGS) up to 1.0MPa

Hayakawa, A., Yamagami, T., Takeuchi, K., Higuchi, Y., Kudo, T., Lowe, S., Gao, Y., Hochgreb, S. & Kobayashi, H., 2019, In: Proceedings of the Combustion Institute. 37, 2, p. 1427-1434 8 p.

研究成果: Article › 査読

4 被引用数 (Scopus)

Science and technology of ammonia combustion

Kobayashi, H., Hayakawa, A., Somarathne, K. D. K. A. & Okafor, E. C., 2019, In: Proceedings of the Combustion Institute. 37, 1, p. 109-133 25 p.

研究成果: Article › 査読

511 被引用数 (Scopus)

Towards the development of an efficient low-NOx ammonia combustor for a micro gas turbine

Okafor, E. C., Somarathne, K. D. K. A., Hayakawa, A., Kudo, T., Kurata, O., Iki, N. & Kobayashi, H., 2019, In: Proceedings of the Combustion Institute. 37, 4, p. 4597-4606 10 p.

研究成果: Article › 査読

130 被引用数 (Scopus)

2018

Development and verification of a supersonic nozzle with a rectangular cross section at a Mach number of 2.8 for a scramjet model combustor

Yamaguchi, T., Hizawa, T., Ichikawa, T., Kudo, T., Hayakawa, A. & Kobayashi, H., 2018 1月 1, In: Journal of Thermal Science and Technology. 13, 2, 18-00393.

研究成果: Article › 査読

Open Access

4 被引用数 (Scopus)

Development of a water-cooled multi-hole calibration burner for optical measurements of flames with high pressures and temperatures

Takeuchi, K., Nunome, Y., Tomioka, S., Tomita, T., Kudo, T., Hayakawa, A. & Kobayashi, H., 2018, In: Journal of Thermal Science and Technology. 13, 1, JTST0001.

研究成果: Article › 査読

4 被引用数 (Scopus)

Experimental and numerical study of the laminar burning velocity of CH₄–NH₃–air premixed flames

Okafor, E. C., Naito, Y., Colson, S., Ichikawa, A., Kudo, T., Hayakawa, A. & Kobayashi, H., 2018, In: Combustion and Flame. 187, p. 185-198 14 p.

研究成果: Article › 査読

265 被引用数 (Scopus)

Modelling of ammonia/air non-premixed turbulent swirling flames in a gas turbine-like combustor at various pressures

Somarathne, K. D. K. A., Colson, S., Hayakawa, A. & Kobayashi, H., 2018 9月 3, In: Combustion Theory and Modelling. 22, 5, p. 973-997 25 p.

研究成果: Article › 査読

39 被引用数 (Scopus)

Total temperature estimation of a hydrogen/air burned-gas torch igniter for a scramjet combustor

Yamaguchi, T., Hizawa, T., Ichikawa, T., Kudo, T., Hayakawa, A. & Kobayashi, H., 2018, In: Journal of Thermal Science and Technology. 13, 2, 18-00208.

研究成果: Article › 査読

Open Access

4 被引用数 (Scopus)

2017

Application of OH(2,0) band excitation Planar Laser-induced Fluorescence to high-pressure H₂/O₂ jet flames for rocket combustion

Takeuchi, K., Nunome, Y., Tomioka, S., Tomita, T., Kudo, T., Hayakawa, A. & Kobayashi, H., 2017, In: Transactions of the Japan Society for Aeronautical and Space Sciences. 60, 2, p. 116-123 8 p.

研究成果: Article › 査読

Open Access

5 被引用数 (Scopus)

Experimental investigation of stabilization and emission characteristics of ammonia/air premixed flames in a swirl combustor

Hayakawa, A., Arakawa, Y., Mimoto, R., Somarathne, K. D. K. A., Kudo, T. & Kobayashi, H., 2017 5月 11, In: International Journal of Hydrogen Energy. 42, 19, p. 14010-14018 9 p.

研究成果: Article › 査読

132 被引用数 (Scopus)

Numerical study of a low emission gas turbine like combustor for turbulent ammonia/air premixed swirl flames with a secondary air injection at high pressure

Somarathne, K. D. K. A., Hatakeyama, S., Hayakawa, A. & Kobayashi, H., 2017 11月 2, In: International Journal of Hydrogen Energy. 42, 44, p. 27388-27399 12 p.

研究成果: Article › 査読

121 被引用数 (Scopus)

Performances and emission characteristics of NH₃-air and NH₃-CH₄-air combustion gas-turbine power generations

Kurata, O., Iki, N., Matsunuma, T., Inoue, T., Tsujimura, T., Furutani, H., Kobayashi, H. & Hayakawa, A., 2017, In: Proceedings of the Combustion Institute. 36, 3, p. 3351-3359 9 p.

研究成果: Article › 査読

207 被引用数 (Scopus)

Simultaneous, two-camera, 2D gas-phase temperature and velocity measurements by thermographic particle image velocimetry with ZnO tracers

Fan, L., Gao, Y., Hayakawa, A. & Hochgreb, S., 2017 4月 1, In: Experiments in Fluids. 58, 4, 34.

研究成果: Article › 査読

Open Access

12 被引用数 (Scopus)

2016

Effects of incident shockwave on flame-holding downstream of ramp injector in supersonic flow

Iwamura, Y., Yamaguchi, T., Hayakawa, A., Kudo, T. & Kobayashi, H., 2016 1月 1, In: Transactions of the Japan Society for Aeronautical and Space Sciences. 59, 2, p. 64-70 7 p.

研究成果: Article › 査読

3 被引用数 (Scopus)

Extinction characteristics of ammonia/air counterflow premixed flames at various pressures

Colson, S., Hayakawa, A., Kudo, T. & Kobayashi, H., 2016, In: Journal of Thermal Science and Technology. 11, 3, JTST0048.

研究成果: Article › 査読

Open Access

24 被引用数 (Scopus)

2015

Laminar burning velocity and Markstein length of ammonia/air premixed flames at various pressures

Hayakawa, A., Goto, T., Mimoto, R., Arakawa, Y., Kudo, T. & Kobayashi, H., 2015 7月 3, In: Fuel. 159, p. 98-106 9 p., 9373.

研究成果: Article › 査読

277 被引用数 (Scopus)

Laminar burning velocity and Markstein length of ammonia/hydrogen/air premixed flames at elevated pressures

Ichikawa, A., Hayakawa, A., Kitagawa, Y., Kunkuma Amila Somarathne, K. D., Kudo, T. & Kobayashi, H., 2015 8月 10, In: International Journal of Hydrogen Energy. 40, 30, p. 9570-9578 9 p.

研究成果: Article › 査読

139 被引用数 (Scopus)

2014

Effects of hydrogen concentration on premixed laminar flames of hydrogen-methane-air

Okafor, E. C., Hayakawa, A., Nagano, Y. & Kitagawa, T., 2014 2月 4, In: International Journal of Hydrogen Energy. 39, 5, p. 2409-2417 9 p.

研究成果: Article › 査読

85 被引用数 (Scopus)

2012

Analysis of turbulent burning velocity of spherically propagating premixed flame with effective turbulence intensity

Hayakawa, A., Miki, Y., Nagano, Y. & Kitagawa, T., 2012, In: Journal of Thermal Science and Technology. 7, 4, p. 507-521 15 p.

研究成果: Article › 査読

14 被引用数 (Scopus)

2011

Combustion properties of hydrogen/air mixture with and without dilution

Nagano, Y., Takeo, T., Tomari, K., Hayakawa, A., Kobayashi, S. & Kitagawa, T., 2011 1月 1, In: SAE Technical Papers.

研究成果: Article › 査読

Effects of CO₂ and N₂ dilutions on laminar and turbulent flame propagation

Hayakawa, A., Miki, Y., Kobayashi, S., Nagano, Y. & Kitagawa, T., 2011 1月 1, In: SAE Technical Papers.

研究成果: Article › 査読

2 被引用数 (Scopus)

2010

Effects of pressure on laminar and turbulent burning velocities of ethanol premixed flames

Ohara, K., Tsukikawa, M., Araki, Y., Hayakawa, A., Kobayashi, S., Nagano, Y. & Kitagawa, T., 2010 12月 1, In: Nihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy. 89, 11, p. 1088-1094 7 p.

研究成果: Article › 査読

1 被引用数 (Scopus)

2008

Turbulent burning velocity of hydrogen-air premixed propagating flames at elevated pressures

Kitagawa, T., Nakahara, T., Maruyama, K., Kado, K., Hayakawa, A. & Kobayashi, S., 2008 10月, In: International Journal of Hydrogen Energy. 33, 20, p. 5842-5849 8 p.

研究成果: Article › 査読

108 被引用数 (Scopus)

早川 晃弘

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早川晃弘