Simultaneous time-resolved fluctuating temperature and acoustic pressure field measurements in a premixed swirl flame

•Heterogeneous sensors used to examine the thermo-acoustic behavior of flames.•Examined the interdependence of high temperatures on acoustic source localization.•Acoustic sources occur in the regions of high pressure fluctuation.•Thermal and acoustic field coherent structures identified at high/low frequency bands.•Regions of maximum temperature and pressure fluctuations identified. A micro-thermocouple, microphones and microphone probes were employed to provide detailed information on key ongoing processes in a premixed swirl flame. High frequency pressure and temperature measurements were carried out to identify temperature field and acoustic characteristics of a swirl stabilized premixed flame. The local distributions of fluctuating pressure and temperature were measured in different regions, in and around the flame. Noise sources were investigated by using microphone probes and microphone arrays. Temperature and pressure fluctuations were examined both inside and outside the flame boundary. Sensor network used here is essential for the development of advanced combustion systems for it can provide detailed temporal and spatial information that can allow for better control to achieve higher efficiency and performance.