The gas analysis system for measurement of combustion efficiency and exhaust emissions for aero gas turbine main combustor was introduced. The measurement error on combustion efficiency and exhaust emissions were analyzed in consideration of four aspects: sampling probe error

traversing mechanism movement

sampling probe temperature control and instrument error. Results e showed that by using mixed sampling probe and traversing mechanism

the measurement error for combustion efficiency was less than 0.21%

the error for air-fuel ratio and emissions was less than 1.11% and 2.24%

respectively. Combustion efficiency and emission volume fraction distribution under different combustor operational conditions were statistically analyzed. It is clear that under high power and high fuel air ratio conditions

these distributions are relatively uniform

thus it is appropriate to reduce a certain number of sampling points. Generally speaking

a large amount of sampling points is necessary to ensure the measurement accuracy of gas analysis method.