摘要
为了降低燃机透平叶片的温度,进一步提高透平叶片的使用寿命和燃机的功率,对燃机预旋喷嘴的流动特性进行了数值研究,研究了预旋喷嘴的长径比对喷嘴流量系数、出气角度和流场均匀性的影响。通过研究发现随着预旋喷嘴长径比的增加,预旋喷嘴的出气角度先减小后增加,最后趋近于预旋角度;出气角度的均匀性和出气速度的均匀性都有很大的提高;预旋喷嘴流量系数随着长径比的增加先减小后增加。
Numerical investigation of the flow of preswirl nozzle was carried out to reduce the temperature of gas turbine blade and further improve the service life and the power of gas turbine. The influence of length-to-diameter ratio on the discharge coefficient, outflow angle and flow field uniformity of a preswirl nozzle was studied extensively. The results showed that outflow angle first decreased and then increased with the increase of length-to-diameter ratio, finally approaching the preswirl angle, outflow angle and flow field uniformity were greatly improved, the discharge coefficient of preswirl nozzle first raised and then reduced with increasing of length-to-diameter ratio of the preswirl nozzle.
出处
《东方汽轮机》
2012年第1期53-60,共8页
Dongfang Turbine
关键词
预旋喷嘴
长径比
流量系数:均匀性
preswirl nozzle, length-to-diameter ratio, discharge coefficient, uniformity
