Abstract:

The flow characteristics of the recirculatiou zone behind the v-guttcr flamcholcler were investigated experimentally under sub-atmosphcrc in this paper by use of a hot-wire anemometry.Two dimensional test section with a side face of glass is used.Its size is 100 × 150mm2.The distributions of the local mean velocity .turbulent intensity,Reylond stress,turbulent scale, the size of recirculation zone, relative mass flow rate were obtained. The results show that the factors above metioned arc reduced with decreasing the pressure under sub-atmosphere.The turbulent scale is increased with decreasing the pressure. The reduction of flow characteristics above and increase of turbulent scale worsen the combustion performance of fuel-air mixture in the afterburner under sub-atmosphere.Thus a new basis was provided for analysing the combustion performance of v-gutter flameholder in a afterburner under sub-atmosphere from the fluid mechanics.

Key words: flameholder, recirculation zone, fluid mechanics