METHOD AND DEVICE FOR ANALYZING VIBRATION COMBUSTION AND STORAGE MEDIUM

• Main Author: KAGIYA SHINICHI
• Format: Patent
• Language: English
• Published: 21.05.1999
• Edition: 6
• Subjects: BLASTING; COMBUSTION APPARATUS; COMBUSTION PROCESSES; HEATING; LIGHTING; MECHANICAL ENGINEERING; REGULATING OR CONTROLLING COMBUSTION; WEAPONS

PROBLEM TO BE SOLVED: To accurately estimate the generation of vibration combustion at the design stage of a combustion device by simultaneously analyzing vibration combustion phenomenon by the finite element method using two specific basic equations, and obtaining a sound pressure at an arbitrary point in an analysis model. SOLUTION: In the analysis model, cooling water is circulated around a burner for cooling the burner and temperature in a mixing room is set to 288K. Further, a calculation area is provided also outside a combustion device and infinite boundary conditions are defined at the boundary. Then, when a numerical analysis is to be effected, a vibration combustion phenomenon is described by two basic equations of a wave equation (an expression 1) containing a generation term for controlling a region where fire exists and a wave equation (an expression 2) not containing generation terms for controlling other regions, the basic equations are simultaneously analyzed by using the finite element method, and the frequency response result of sound pressure at an arbitrary point is obtained. In this case, ω, p, c, R Cv, and q indicate a frequency, pressure fluctuation, a sound speed, a gas constant, constant volume specific heat, and the speed of heat generation, respectively.