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Effects of struts profiles and skewed angles on the aerodynamic performance of gas turbine exhaust diffuser
Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy ( IF 1.7 ) Pub Date : 2021-01-05 , DOI: 10.1177/0957650920985201
Yuxuan Dong 1 , Zhigang Li 1 , Jun Li 1 , Liming Song 1
Affiliation  

The strut structure directly affects the flow field characteristics and aerodynamic performance of the gas turbine exhaust diffuser. The effects of the strut profiles and strut skewed angles on the aerodynamic performance of the exhaust diffuser at different inlet pre-swirls were numerically investigated using three-dimensional Reynolds-Averaged Navier-Stokes(RANS) and Realizable k-ε turbulence model. The numerical static pressure recovery coefficient of the exhaust diffuser is in agreement with the experimental data well. The reliability of the numerical method for the exhaust diffuser performance analysis was demonstrated. Exhaust diffusers with four kinds of vertical strut profiles obtain the highest static pressure recovery coefficient at the inlet pre-swirl of 0.35. The similar static pressure recovery coefficient of exhaust diffusers with four kinds of vertical strut airfoils are observed when the inlet pre-swirl is less than 0.48. The static pressure recovery coefficient of exhaust diffusers with vertical b1 and b2 struts are higher than that with the a1 and a2 struts when the inlet pre-swirl is greater than 0.48. At the inlet pre-swirl of 0.35, The static pressure recovery coefficient of the exhaust diffuser with the a1 strut decreases with the increasing of the strut skewed angles. The static pressure recovery coefficient of the exhaust diffuser with the b1 strut increases with the increasing of the strut skewed angles, and the static pressure recovery coefficient increases by 3.6% compared with the vertical design when the skewed angle of b1 strut is 40°. At the inlet pre-swirl of 0.64. The static pressure recovery coefficient of the exhaust diffuser with the a1 strut increases by 8.7% compared with the vertical design when the skewed angle of a1 strut is greater than 20°. In addition, the static pressure recovery coefficient of the exhaust diffuser with the b1 strut decreases by 3.8% compared with the vertical design when the skewed angle of b1 strut is 40°. The method to improve the aerodynamic performance of the exhaust diffuser by appropriate increase the strut maximum thickness and design the strut skewed angle is proposed in this work.



中文翻译:

支柱轮廓和倾斜角度对燃气轮机排气扩压器空气动力学性能的影响

支柱结构直接影响燃气轮机排气扩散器的流场特性和空气动力性能。利用三维雷诺平均Navier-Stokes(RANS)模型和可实现的k-ε湍流模型,数值研究了支杆外形和支杆偏斜角对排气扩散器在不同进气预旋流下空气动力学性能的影响。排气扩压器的数值静压力恢复系数与实验数据吻合良好。证明了数值方法用于排气扩压器性能分析的可靠性。具有四种垂直支柱轮廓的排气扩压器在进口预旋流处获得最高的静压恢复系数,为0.35。当进气口的预旋角小于0.48时,观察到具有四种垂直支柱翼型的排气扩散器的静压恢复系数相似。当入口预旋流大于0.48时,垂直b1和b2撑杆的排气扩压器的静压恢复系数高于a1和a2撑杆的排气扩压器。在入口预旋为0.35时,随着a1支杆的排气扩散器的静压恢复系数随支杆偏角的增加而减小。b1撑杆的倾斜角越大,排气扩压器的静压恢复系数就越大,与垂直设计相比,b1撑杆的倾斜角为40°时,静压恢复系数增加3.6%。当入口预旋流大于0.48时,垂直b1和b2撑杆的排气扩压器的静压恢复系数高于a1和a2撑杆的排气扩压器。在入口预旋为0.35时,随着a1支杆的排气扩散器的静压恢复系数随支杆偏角的增加而减小。b1撑杆的倾斜角越大,排气扩压器的静压恢复系数就越大,与垂直设计相比,b1撑杆的倾斜角为40°时,静压恢复系数增加3.6%。当入口预旋流大于0.48时,垂直b1和b2撑杆的排气扩压器的静压恢复系数高于a1和a2撑杆的排气扩压器。在入口预旋为0.35时,随着a1支杆的排气扩散器的静压恢复系数随支杆偏角的增加而减小。b1撑杆的倾斜角越大,排气扩压器的静压恢复系数就越大,与垂直设计相比,b1撑杆的倾斜角为40°时,静压恢复系数增加3.6%。带有a1支撑杆的排气扩压器的静压恢复系数随支撑杆偏角的增加而减小。b1撑杆的倾斜角越大,排气扩压器的静压恢复系数就越大,与垂直设计相比,b1撑杆的倾斜角为40°时,静压恢复系数增加3.6%。带有a1支撑杆的排气扩压器的静压恢复系数随支撑杆偏角的增加而减小。b1撑杆的倾斜角越大,排气扩压器的静压恢复系数就越大,与垂直设计相比,b1撑杆的倾斜角为40°时,静压恢复系数增加3.6%。°。在入口处预旋为0.64。当a1撑杆的偏角大于20 °时,带有a1撑杆的排气扩压器的静压恢复系数与垂直设计相比增加了8.7%。此外,当b1撑杆的偏角为40 °时,带有b1撑杆的排气扩压器的静压力恢复系数与垂直设计相比降低了3.8%。提出了通过适当增加撑杆最大厚度和设计撑杆偏斜角来改善排气扩压器空气动力学性能的方法。

更新日期:2021-01-06
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