The apparatus of scan measurement was used to gather the temperature pattern at the combustor outlet

where the average working temperature of gas was about 1700K and the maximum temperature was about 1950K. Consequently

the measurement part was cooled by water or air. Usually

for intermittent measurement devices

the interval of circle angel could be changed to get a high-density temperature distribution. A continuous measurement manner was adopted to get point in circle. The angle between two measure-points was 1.286°.The annular combustor outlet was about 40 to 50mm in height

where 5 or 6 measure points were usually arranged. In this device

10 measure points were arranged in a range of 45.5mm. Four thermocouples were arranged in circle to obtain 2800 measure-points of the temperature field in a single experiment. Data were drawn from the whole datasheet at intervals. Each group of data whose number decreased in turn

included temperature points of 2800

1400

700

and 350

respectively. Several groups of temperature distributions with different densities were established. Subsequently

data processing was conducted to calculate the main combustor characteristics

including arithmetic or integral average temperature

OTDF (overall temperature distribution factor) and RTDF(radial temperature distribution factor). It is found that the data from different groups with different measuring densities result in significant difference on the combustor characteristics. The veracity of temperature characteristics increases with the growing measure-density.