Michio Kuroda

Analysis of natural vibrations of a spherical shell with variable thickness

This paper is concerned with the natural vibrations of a spherical shell with variable thickness in the meridional direction. The governing equations of motion are based upon the classical small deflection theory of thin shells postulated by Love for the case of shell vibrations. In this paper, it is shown that the eight solutions of these equations for the asymmetrical vibrations can be obtained analytically by the method of series solution. As a practical example, four solutions required in the case of a hemispherical shell with a free edge are derived. Last, to demonstrate the utility of the present method, the numerical results are compared with the experimental data.

Development of dry two-stage low-NOx combustor for a gas turbine

A dry two-stage low NO/sub x/ combustor for a 73 MW gas turbine is developed to meet stringent NO/sub x/ limitations in Japan. This combustion system has a fuel-air control mechanism to ensure stable switching from one-stage combustion to two-stage combustion. NO/sub x/ emission is very low not only at full load but also in the entire gas turbine operating range. The NO/sub x/ characteristics have proved to be within the goal in full scale, full pressure combustion tests. This paper outlines the development plan and describes the structure and combustion characteristics of the low NO/sub x/ combustor.