Effect of internal temperature fluctuations on noise production and transmission of pressure fluctuations to the far field

The transmission of pressure fluctuations was studied experimentally, along with the transmission of temperature fluctuations from a plenum through the exit of a nozzle into the ambient atmosphere. The experiments were conducted for discrete frequency inputs of both temperature and pressure fluctuations from 100 to 5000 Hz and for an exit Mach number of 0.56. The experiments revealed a direct proportionality between the generated pressure fluctuations and those sensed in the far field. The data obtained are used as a basis to develop a model for the transmission internal temperature and pressure fluctuations through a jet.