Estudo experimental de um combustor anular

Abstract

This study presents an experimental investigation of the thermal behavior of an annular combustor. The system was designed using 3D modeling software, built with carbon steel tubes, and instrumented with type K thermocouples and a pressure transducer. The instrumentation was integrated into a data acquisition system, enabling precise temperature measurements in different regions of the combustor and monitoring of internal pressure variation during combustion. The tests were conducted using ethanol as fuel. In parallel, a thermodynamic analysis based on the analytical method proposed by Lefebvre and Ballal (2010) was developed and implemented in the EES software to estimate the analytical temperature in the primary zone. The maximum temperature recorded experimentally was approximately 370 °C, lower than the 529.7 °C predicted by the analytical model, a difference attributed to heat absorption by the ethanol present in the annular chamber. The energy required to vaporize two liters of ethanol was estimated at 1,545.8 kJ, corresponding to an average temperature variation of 140.9 °C. The experimental results showed a difference of approximately 4.3% compared to the analytical data, considering heat losses and ethanol heat absorption.