Acoustic Excitation of Diffusion Flames with Coherent Structure in a Plane Shear Layer : Application of Active Combustion Control to Two-Dimensional Phase-Locked Averaging Measurements

• Published in: Transactions of the Japan Society of Mechanical Engineers Series B Vol. 59; no. 567; pp. 3645 - 3650
• Main Authors: Ishino, Yojiro, Kojima, Toshiaki, Oiwa, Norio, Yamaguchi, Shigeki
• Format: Journal Article
• Language: Japanese
• Published: The Japan Society of Mechanical Engineers 25.11.1993
• Subjects: Sound-Flame Interaction
• ISSN: 0387-5016; 1884-8346
• DOI: 10.1299/kikaib.59.3645

In the previous paper, it was shown that the acoustic excitation of a plane diffusion flame enhances the periodicity and intensity of organized-eddy-controlled combustion. The main objective in this paper is, thus, to examine phase characteristics of the excited eddy flames with high periodicity. A computer-aided phase-locked averaging method is employed to obtain graphical 2D contour maps of the instantaneous profiles of temperature and CH emission. Both maps of eight consecutive phases indicate clearly not only the periodic behavior of the organized eddy flame, but also the gas dynamic properties peculiar to those flames with coherent structure. The profiles of local contribution of the sound field to the combustion process are also examined by calculating the 2D distribution of the local Rayleigh index. The latter shows that the organized eddy flames have high sensitivity to sound, and play an important role in a sound-flame interaction.