Energy Dynamics Laboratory

Innovative Energy Research Center

Energy Dynamics Laboratory

Professor
Kaoru
Maruta
Assistant Professor
Hisashi
Nakamura

We pursue research and development on effective energy conversion and energy process in combustion and reactive thermal fluid systems with new technology concepts. By taking heat and/or mass regenerations as keywords, interdisciplinary researches are conducted with domestic and international collaboration partners in academic and industry.
・Micro-, Mild and Microgravity combustions
・Multi-stage oxidation by micro flow reactor with prescribed temperature profile
・Combustion with surrogate fuels, biomass, and synthetic fuels
・Molecular level reaction design

Study on Ignition and Low-Temperature Oxidation by Micro Reactor

Stationary multi-stage oxidation of alternative fuels and biofuels was realized by the micro flow reactor with controlled temperature profile. By this method, the lowest ignition temperature and low-temperature reaction path could be identified. A high fidelity molecular level reaction design is being developed with solid theoretical basis.

Swissroll Microcombustors for Heat Sources

We have developed Swissroll microcombustor heaters with ±1℃ temperature controllability whereas it is combustion-based. Since gaseous hydrocarbon fuels are directly introduced into combustors, total thermal efficiencies of the heaters are twice or even larger compared with those of conventional electric heaters. Besides this, the microcombustor heaters can be operated in any atmospheres because it is sealed. They are advantageous of electromagnetic induction free as well. We have also succeeded in developing coin-size combustor.

Microcombustion

We study 'microcombustion', i.e. combustion with representative length scales equivalent to or smaller than the ordinary quenching distance. Since heat recirculation is extensively employed as a thermal management for achieving stable combustion in micro scale, we introduced a new experimental geometry of "micro and meso scale channels with temperature gradients" as a simplified model of heat recirculation condition. Results showed FREI (Flames with Repetitive Extinction and Ignition) as well as normal and weak flames. Then, 2-D radial microchannel was also introduced and various flame pattern formations, such as Pelton-like, spiral, broken and triple-branch flames, were observed for the first time.

Ultra low-Stretched Counterflow Flames under Microgravity Environment in“Kibo”Japanese Experimental Module and Airplane

Our proposal on space combustion experiment was selected as a candidate project at the “Kibo” Japanese Experimental Module in the International Space Station. The objective is to construct the unified combustion limit theory of propagating flame and flame ball under the oxy-fuel combustion condition using ultra low-stretched counterflow flames.

Energy Dynamics Laboratory