**8. Nomenclature**


accuracy, they are anticipated to make various contributions not only for qualitative and quantitative studies in facilitating understanding, but also for practical utility, such as designs of furnaces, combustors, ablative carbon heat-shields, and high-temperature

Finally, relevant to the High-Temperature Air Combustion, carbon combustion has been studied, by varying H2O mass-fraction up to 0.10. It has been found that the high H2O massfraction is unfavorable for the enhancement of combustion rate, especially in the medium temperature range, because establishment of the CO-flame is facilitated, and hence suppresses the combustion rate. To the contrary, at high surface temperatures (>2000 K), the high H2O mass-fraction is favorable because the water vapor participates in the surface reaction as an additional oxidizer. Theoretical results, obtained by additionally introducing the surface C-H2O reaction and the global gas-phase H2-O2 reaction into the previous formulation, have also suggested the usefulness of the explicit expressions for the combustion rate. As for the combustion in the humid airflow with relatively low velocity gradient, it is found that a new mode with suppressed H2-ejection from the surface can

Although essential feature of the carbon combustion has been captured to some extents, further progresses are strongly required for its firm understanding, because wide attention

In conducting a series of studies on the carbon combustion, I have been assisted by many of my former graduate and undergraduate students, as well as research staffs, in Shizuoka University, being engaged in researches in the field of mechanical engineering for twenty years as a staff, from a research associate to a full professor. Here, I want to express my sincere appreciation to all of them who have participated in researches for exploring

*j j*=0 and 1 designate two-dimensional and axisymmetric flows, respectively

structures with C/C-composites in various aerospace applications.

fairly represent the experimental observation.

*A* reduced surface Damköhler number *a* velocity gradient in the stagnation flowfield

*F* function defined in the ignition criterion

*f* nondimensional streamfunction

*hD* mass-transfer coefficient

*k* surface reactivity

*c*p specific heat capacity of gas

**7. Acknowledgment**

combustion of solid carbon.

*B* frequency factor

*D* diffusion coefficient *Da* Damköhler number *d* diameter or constant *E* activation energy

**8. Nomenclature** 

*b* constant *c* constant

*K* factor

has been given to carbonaceous materials in various fields.

