A Study on Non-Steady Combustion : 3rd Report, On Dynamic Responses of Pipe Systems Accompanied with Combustion

抄録

This paper deals with calculating methods of dynamic responses about the pipe system in which combustion takes place. The converting equations from heat release rate into pressure wave generation that were proposed in the previous paper, and usual acoustic theories for normal temperature are used in the theoretical analyses. In order to compare the theoretical results with the experimental ones the following combustor and rotary throttle were produced. In this combustor, one dimensional combustion states can be attained. Rotating throttle supplies combustible mixture in a manner close to a sinusoidal oscillating type. Obtained results show that the amplitude in the combustion state becomes high in comparison to the one in the non-combustion state. It is recognized that the amplitude gain depends on the magnitude of heat release per unit time and that the main source of this gain is a pressure originating from the volumetric expansion by combustion. It is also studied how the length of combustion region, pipe length and volume exert effects on the dynamic responses.