In order to study the best cooling style for a triple combustor of three different cooling styles
temperature-sensitive paints and thermocouple were used to study of wall temperature profiles of the flame tube. The result show that
it is difficult to distinguish cooling effect when using a few thermocouples to measure the wall temperature; the best cooling style of flame tube could be analyzed by temperature-sensitive paints
including wall temperature and temperature distribution; the temperature recognition accuracy based on isotherm temperature identification is ±10℃
the experiment result is an important reference to compare and assess the cooling effect of flame tube.