摘要
本文采用数值模拟方法研究了高负荷涡轮中载荷系数,流量系数、反动度和轴向速比四个参数对涡轮级效率的影响,采用的计算程序以等熵效率公式为基础,并加入了改进的KO损失模型,在一定载荷系数、流量系数、反动度、轴向速比、稠度、轮毂比、展弦比、尾缘厚度/喉部宽度和叶顶间隙/叶高范围内,通过正交实验设计方法分析了各参数对涡轮效率的敏感性,其中稠度、轮毂比、展弦比和尾缘厚度/喉部宽度的敏感性相对较低,可以忽略。与此同时,针对一载荷系数2.6、压比5的高负荷涡轮详细计算分析了载荷系数、流量系数、反动度和轴向速比四个参数对涡轮效率的影响和选取准则,通过综合分析得到了具有一定适用范围的高负荷涡轮气动参数选取参考图。在此基础上,进行了高负荷涡轮气动方案设计,并利用三维数值模拟手段对所设计的气动方案进行了验证,结果表明:三维数值计算结果与一维分析结果偏差较小,采用此准则选取相关气动参数可以设计出满足条件并且性能良好的高负荷跨声速涡轮。
The impact of loading factor,flow coefficient,reaction and axial velocity ratio of a highly loaded turbine on stage efficiency is studied by numerical simulation in this paper.The calculation program is based on the isentropic efficiency formula and the improved KO loss model is added into the program.The sensitivity of the parameters to the turbine efficiency is analyzed by means of orthogonal experimental design in a certain range of loading factor,flow coefficient,reaction,axial velocity ratio,solidity,hub-to-tip ratio,aspect ratio,ratio of trailing edge thickness and throat width,ratio of tip clearance and blade height,the result shows that the sensitivity of solidity,hub-to-tip ratio,aspect ratio and ratio of trailing edge thickness and throat width is relatively low so that they can be neglected.Meanwhile,the selection criterion and the impact of loading factor,flow coefficient,reaction and axial velocity ratio of a highly loaded turbine(loading factor is 2.6 and pressure ratio is 5) on stage efficiency are analyzed in detail Through comprehensive analysis,the selection criterion is obtained in a certain scope of application.On the basis of the above analysis,a highly-loaded transonic turbine has been designed.Besides,the selection criterion has been verified through 3-D numerical simulation.The results show that deviations between3-D numerical simulation and 1-D analysis are very small and the highly-loaded transonic turbine,which meets the conditions well and has a good performance,can be designed by using the selection criterion.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2015年第3期486-491,共6页
Journal of Engineering Thermophysics
基金
吴仲华奖励基金资助项目
关键词
高负荷涡轮
气动参数选取准则
正交试验设计
敏感性分析
数值模拟
highly loaded turbine
aerodynamic parameters selection criterion
orthogonal experimental design
sensitivity analysis
numerical simulation
