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为研究液体在透平叶栅流道内雾化特性,在直流道和折转角分别为30°、60°的叶栅流道内进行了液体横向射流雾化试验,试验来流速度为56~91m/s,喷嘴压差为50~400kPa,采用喷油杆结构布置在叶片前缘喷射燃料,用Fraunhofer衍射技术测量液滴雾化细度,用CCD相机记录流道内液滴射流轨迹。研究发现:透平叶栅流道内液滴轨迹同时受液气动量比、叶片折转角度的影响,在叶片前缘向吸力面侧喷和逆喷时的雾化效果优于直流道内横向侧喷。喷嘴压差大于400 kPa时,向叶片吸力面侧喷的液滴索泰尔平均直径小于30μm,雾化粒径可满足燃气轮机燃烧室的要求。
In order to study the atomization characteristics of the liquid in the turbine cascade, a transverse jet atomization test was carried out in the cascade flow channels of 30 ° and 60 °, respectively. The experimental results showed that the flow velocity was 56 ~ 91m / s. The nozzle pressure difference is 50 ~ 400kPa. The structure of the fuel injection rod is used to spray the fuel on the leading edge of the blade. The atomization fineness of the droplet is measured by Fraunhofer diffraction technique. The trajectory of the droplet jet in the flow channel is recorded by a CCD camera. The results show that the droplet trajectory in turbine cascade is influenced by the hydrodynamic ratio and the turning angle of the blade at the same time. The atomization effect when the leading edge of the blade moves toward the suction side and reverse jet is better than that of the lateral side jet . When the pressure drop of the nozzle is more than 400 kPa, the average Sauter value of the droplets sprayed on the suction side of the blade is less than 30 μm. The atomized particle size can meet the requirements of the gas turbine combustor.