摘要
采用数值求解三维URANS方程和SST湍流模型的方法,研究了导叶尾缘下端壁造型对轮缘密封的封严性能及涡轮主流气动性能的影响。对比了导叶尾缘5种不同端壁造型结构的轮缘密封封严效率和涡轮级效率。结果表明:导叶尾缘端壁凹凸幅值较大时会降低涡轮效率,端壁凹陷10%叶高时效率降低0.377%,端壁凸起10%叶高时效率降低0.103%。尾缘端壁造型会影响转静间隙附近的流动形态,进而影响轮缘密封封严效率;凸起端壁使转静间隙附近的主流径向分速度减小,燃气入侵增加,冷气质量流量比MFR=0.3%时,较无端壁造型封严效率降低0.13;凹陷端壁使转静间隙附近的主流径向分速度增大,燃气入侵减少,MFR=0.3%时,较无端壁造型封严效率提升0.2。
The effect of lower endwall profiling of guide vane trailing edge on sealing effectiveness of rim seal and aerodynamic performance of turbine main flow was numerically investigated using 3D unsteady Reynolds-averaged Navier-Stokes(URANS)equations and SST turbulent model.The sealing effectiveness of rim seal and aerodynamic performance of turbine stage were compared among five kinds of endwall profilings of guide vane trailing edge.The results show that the turbine stage efficiency can be reduced when the guide vane tailing edge concave and convex endwall amplitudes are large.The turbine stage efficiency is reduced by 0.377%for the concave endwall and 0.103%for the convex endwall when the amplitude is 10%blade height.The endwall profiling of vane trailing edge will affect the sealing effectiveness of rim seal by changing the flow pattern near the stator-rotor clearance.The convex endwall reduces the radial component velocity of main flow near the stator-rotor clearance,resulting in increased gas ingestion,when cold air mass flow ratio(MFR)is 0.3%,the sealing effectiveness is 0.13 lower than that without the axisymmetric endwall.The concave endwall increases the radial component velocity of main flow near the stator-rotor clearance,resulting in reduced gas ingestion,when MFR is 0.3%,the sealing effectiveness is 0.2 higher than that without the axisymmetric endwall.
作者
程舒娴
杜昆
李昆阳
CHENG Shuxian;DU Kun;LI Kunyang(AECC Commercial Aircraft Engine Co.,Ltd.,Shanghai,China,Post Code:201100;School of Power and Energy,Northwestern Polytechnical University,Xi′an,China,Post Code:710072)
出处
《热能动力工程》
CAS
CSCD
北大核心
2024年第11期135-141,共7页
Journal of Engineering for Thermal Energy and Power
基金
国家自然科学基金(52006178,U2241268)
国家科技重大专项(2022-DC-I-002-001)。
关键词
轮缘密封
端壁造型
封严效率
气动性能
数值模拟
rim seal
endwall profiling
sealing effectiveness
aerodynamic performance
numerical simulation
