针对燃气轮机NOx排放较高的问题，试验研究了某型燃气轮机火焰筒掺混孔前移后，点火、熄火、污染物排放及出口温度场等燃烧性能。研究结果表明：将火焰筒掺混孔前移20 mm至第2道冷却气膜后，贫油点火油气比由0.023 35~0.033 02增加到0.024 46~0.036 33；熄火油气比由0.005 18~0.006 88增加到0.005 90~0.007 17；污染物排放中CO由969.54增加到1 090.45 mg/m3；UHC（未燃碳氢）由116.93增加到145.91 mg/m3；NOx由163.85降低到87.0 mg/m3；出口温度分布系数由0.225 5增加到0.244 9。通过调整掺混孔孔径比，温度分布系数降低至0.229 2，接近原型水平，可以实现较低NOx排放。

Aiming at the problem of high NOx emission of gas turbine,the combustion performance of ignition,blowout,pollution emission and outlet temperature field of a certain type of gas turbine flame tube with dilution holes moving forward was studied experimentally.The research results show that the lean ignition fuelair ratio increases slightly from the range of 0.023 35 to 0.033 02 to the range of 0.024 46 to 0.036 33 when the dilution holes is moved forward 20 mm to the second cooling film; the blowout fuelair ratio increases slightly from the range of 0.005 18 to 0.006 88 to the range of 0.005 90 to 0.007 17;In pollutant emissions,CO concentration increases from 969.54 to 1 090.45 mg/m3; unburned hydrocarbon (UHC) increases from 116.93 to 145.91 mg/m3; NOx decreases from 163.85 to 87.0 mg/m3; outlet temperature distribution coefficient increases from 0.225 5 to 0.244 9.By adjusting the dilution hole diameter ratio,the temperature distribution coefficient is reduced to 0.229 2 which is close to the prototype,so as to achieve lower NOx emission.

V231.2

国家自然科学基金（51376133）；航空科学基金（2015ZB54003）