Teaching staff

Associate professor

Kohei OZAWA

Affiliation

School of Engineering

Department of Engineering

Professional Career

2022.02 - present: Associate Professor, School of Engineering, Department of Engineering, Kyushu Institute of Techonology

2022.02 - 2024.02: Overseas Research Fellowship, the Japan Society for the Promotion of Science, Department of Aerospace Engineering, University of Michigan

2017.03 – 2022.01: Assistant Professor, School of Engineering, Department of Engineering, Kyushu Institute of Technology

2016.07 – 2016.09: Visiting Student Researcher, Department of Aeronautics and Astronautics, Stanford University

2015.04 – 2017.03: Research Fellowship, the Japan Society for the Promotion of Science.

Academic Qualifications

2017.03 Doctor of Engineering, the University of Tokyo

2014.03 Master of Engineering, the University of Tokyo

2012.03 Bachelor of Engineering, the University of Tokyo

Research Interests

Aerospace Engineering, Fluid Dynamics, Combusion Engineering

Research Topics
 1. Hybrid Rocket
1-1. Real-time fuel regression measurement by solid fuel using multi-material additive-manufacturing
1-2. Advanced closed-loop control of thrust and mixing-ratio for hybrid rocket engines
1-3. Acceleration dependence of the regression rate characteristics of wax-based fuels

* The first and second research topics are financially supported by JKA Fundation. move to research report page (Japanese only)


 2. Detonation
2-1. Thruster for reaction control systems using pulse detonation engines
2-2. Non-intrusive measurements of shock front and combustion near the detonation propagation limits
2-3. Relationship between combustion characteristics and detonation wave properties in disk-shaped rotating detonation engines

Peer-reviewed Journal Articles

1. Ozawa, K., Wang, H., Inenaga, T., Tsuboi, N., "Regression Behavior of Polylactic Acid Manufactured by Fused Filament Fabrication for Hybrid Rocket Propulsion," Science and Technology of Energetic Materials, Vol. 82 (6), pp. 170-177, 2021.
View paper

2. Ozawa, K., Wang, H., Yoshino, T., Tsuboi, N., "Time-Resolved Fuel Regression Measurement Function of a Hybrid Rocket Solid Fuel Integrated by Multi-Material Additive Manufacturing," Acta Astronautica, Vol. 187, pp. 89-100, 2021.

3. Takeshima, N., Ozawa, K., Tsuboi, N., Hayashi, K., A., Morii, Y., "Numerical Simulations on Propane/Oxygen Detonation in a Narrow Channel Using a Detailed Chemical Mechanism: Formation and Detailed Structure of Irregular Cells," Shock Waves, Vol. 30, pp. 809-824, 2020.

4. Ozawa, K., Shimada, T., "Performance of Mixture-Ratio-Controlled Hybrid Rockets under Uncertainties in Fuel Regression," Journal of Propulsion and Power, Vol. 37 (1), pp. 86-89, 2020.

5. Ozawa, K., Shimada, T., "Performance of Mixture-Ratio-Controlled Hybrid Rockets for Nominal Fuel Regression," Journal of Propulsion and Power, Vol. 36 (3), pp. 400–414, 2020.
View paper

6. Ozawa, K., Shimada, T., "A Theoretical Study on Throttle Ranges of O/F Controllable Hybrid Rocket Propulsion Systems," Journal of Fluid Science and Technology, Vol. 13 (4), pp. 1-18, 2018.
View paper

7. Jourdaine, N., Tsuboi, N., Ozawa, K., Kojima T., Hayashi A. K., "Three-dimensional Numerical Thrust Performance Analysis of Hydrogen Fuel Mixture Rotating Detonation Engine with Aerospike Nozzle," Proceedings of the Combustion Institute, Vol. 37 (3), pp. 3443-3451, 2018.

8. Ozawa, K., Kitagawa, K., Aso, S., Shimada, T., "Hybrid Rocket Firing Experiments at Various Axial-Tangential Oxidizer-Flow-Rate Ratios," Journal of Propulsion and Power, Vol. 35 (1), pp. 94-108, 2018.
View paper

9. Kawabata, Y., Banno, A., Wada, Y., Ozawa, K., Shimada, T., Kato, N., Hori, K., Nagase, R., "Experimental Investigation of Fuel Regression Rate of Low-Melting-Point Thermoplastic Fuels in the Altering-Intensity Swirling-Oxidizer-Flow-Type Hybrid Rocket Engine," Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan, Vol. 16 (3), pp. 267-273, 2018.

10. Inamori, T., Hamaguchi, R., Ozawa, K., Saisutjarit, P., Sako, N., Nakasuka S., "Online Magnetometer Calibration in Consideration of Geomagnetic Anomalies Using Kalman Filters in Nanosatellites and Microsatellites," Journal of Aerospace Engineering, Vol. 29 (6), 2016.

11. Ozawa, K., Shimada, T., "Theoretical Prediction of Regression Rates in Swirl-Injection Hybrid Rocket Engines," Progress in Propulsion Physics, pp. 283-306, 2016.

12. Ozawa, K., Shimada, T., "A Theoretical Study of Combustion Stability in Vortex Injection Hybrid Rocket Engine," Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan, Vol. 12(ists29), pp. Pa_53-Pa_61, 2014.

Publications

1. Shimada, T., Yuasa, S., Nagata, H., Aso, S., Nakagawa, I., Sawada, K., Hori, K., Kanazaki, M., Chiba, K., Sakurai, T., Morita, T., Kitagawa, K., Wada, Y., Nakata, D., Motoe, M., Funami, Y., Ozawa, K., Usuki T., Part VI Hybrid Rocket Propulsion, Hybrid Propulsion Technology Development in Japan for Economic Space Launch, Chemical Rocket Propulsion: A Comprehensive Survey of Energetic Materials, Springer, pp. 545-576, 2016.

Patent

1. Ozawa, K., Wang, H., Yoshino, T., A Manufacturing Method of Solid Fuels for Hybrid Rocket Engines with a Real-time Regression Rate Measurement Function, Japanese Patent Application Laid-Open No. 2021-063501, 2021

Awards

1. Ozawa, K., JAICI Award, Japan Association for International Chemical Information (JAICI), Japan, 2022.

2. Ozawa, K., Japan Exprosive Society Encouragement Award, Japan Exprosive Society, Japan, 2022.

3. Ozawa, K., Shimada, T., AIAA Hybrid Rockets Best Student Paper, American Institute of Aeronautics and Astronautics (AIAA), Salt Lake City, UT, USA, 2016.

4. Ozawa, K., Japanese Rocket Society Award, 29th International Symposium on Space Technology and Science (ISTS), Nagoya, Japan, 2013.

Research Grant (Years show the year of adoption or the research period. Kohei OZAWA is the principal investigator for all subjects)

1. Investigation on Boundary Layer Combustion of Liquefying Fuel with Low Viscosity in Acceleration Environment, Muroran Institute of Technology, Linear Hyper G joint research grant, 2021.

2. Closed-loop Control of Hybrid Rockets with Functional Solid Fuels Manufactured by Multi-material Additive Manufacturing, Japan Society for the Promotion of Science, Grant-in-Aid for Early-Career Scientists, 2021-2023.

3. Study on Determination Mechanism of Detonation Wave Properties under the Presence of Deflagration and Gaseous Hydrogen-Air Mixing Process, Japan Society for the Promotion of Science, Overseas Research Fellowships, 2021-2022.

4. Investigation on Boundary Layer Combustion of Liquefying Fuel with Low Viscosity in Acceleration Environment, Muroran Institute of Technology, Linear Hyper G joint research grant, 2020.

5. Demonstration of Advanced Closed-Loop Thrust Control of Hybrid Rockets Using Additively-manufactured Solid Fuels, JKA Foundation, Grant-in-Aid for Young Scientists, Promotion of Mechanical Engineering, 2020.

6. Study of Conductive Resin with Graphene for Upgrade of Solid Fuels Capable of Flow Rate Measurement, The Foundation for the Promotion of the Industrial Explosives Technology, Grant-in Aid for High-Energy Materials, 2020.

7. Upgrade of Thrusters for Nano-satellites Using Functional Solid Fuel Manufactured by a 3D Printer, The Hattori Hokokai Foundation, Grant-in-Aid for Young Scientists, Promotion of Mechanical Engineering, 2019.

8. Boundary-Layer Combustion of Blacken Wax-based Fuels at Various Chamber Pressures under Two Steady Acceleration Environments, Society for Promotion of Space Science, Grant-in-Aid for attendance of international conferences, 2019.

9. Real-time regression rate measurement of an additive-manufactured functional hybrid rocket fuel, The Foundation for the Promotion of the Industrial Explosives Technology, Research Grant, 2019.

10. Study on Non-toxic RCS for Upper Stage of Rockets using Detonation Waves, Kitakyushu Foundation for the Advancement of Industry, Science and Technology, 2019.

11.Investigation on Boundary Layer Combustion of Liquefying Fuel with Low Viscosity in Acceleration Environment, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Early-Career Scientists, 2018-2020.

12. Simultaneous Control of Optimal Mixing Ratio and Thrust Using Oxidant Swirl Flow for Hybrid Rocket, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, JSPS Research Fellows, 2015-2016.

Consigned Research

1. Research and Development of Reaction Control System using Pulse Detonation Engine, Interstellar Technologies Inc., 2018 - Now.

Academic Society Memberships

The Japan Society for Aeronautical and Space Sciences, American Institute of Aeronautics and Astronautics, The Japan Society of Mechanical Engineers

Activities of Academic Societies and Committees

The Japan Society for Aeronautical and Space Sciences Western Branch, Executive Secretary, 2020.

Charge Classes

Mechanical Engineering ExperimentⅠ(Sophomore, 4th quarter), Mechanical Engineering ExperimentⅡ(Junior, 2nd quarter), Introduction to Space System Engineering

Articles, Reviews, Commentaries, Editorials, etc. (Bulletin of Univirsities and Institutes)

1. Ozawa, K., Detailed evaluation of nominal performance of mixture-ratio-controlled hybrid rockets, Annual Report of the Institute of Space and Astronautical Science 2020, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS), p.23, 2021
http://id.nii.ac.jp/1696/00048266