The measurement of heat flux (watt/m2) is of interest in directly
determining the cooling requirement of hot section blades and
vanes. In addition if the surface and gas temperatures are known,
the measurement of heat flux provides a value for the convective
heat transfer coefficient that can be compared with the value
provided by CFD codes.
Current Sensor Needs
It is difficult to measure heat flux without having the measurement disturb the measure and, so if a physical sensor is used to measure heat flux, a thin film design is desirable. It must be constructed of materials capable of withstanding the harsh environment in the hot section. Non-intrusive optical methods, such as the use of temperature sensitive paints, should also be pursued since in many cases they do affect measurement at all.