Multiobjective Optimization Study On the Aerodynamic Performance and Anti-Erosion Characteristics of a Single-Stage Dusty Flue Gas Turbine

Liuxi Cai, Yao He, Jiawei Yao, Yanfang Hou, Shun-sen Wang, Zhenping Feng
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Abstract

Solid particle erosion of dusty energy recovery turbine blades has a great impact on the operating economics and safety of the unit. To mitigate the erosion of blade and improve the aerodynamic performance of the turbine, a multiobjective optimization method for turbine cascade based on the experimental design method, genetic algorithm and CFD multiphase flow simulation was developed. The optimization results show that the number of stator and rotor blades and the trailing edge angle at 50% blade span are the main parameters affecting the efficiency and blade erosion of the dusty turbine. By reducing the number of stator blades and the circumferential bending angle of the stator trailing edge, the impingement velocity and impingement probability of particles impinging on the stator trailing edge decrease by 7.5%~16.8% and 8.9%~46.2%, respectively. Additionally, compared with the original design, the flow separation loss and secondary flow intensity of the rotor cascade are suppressed by adjusting the load distribution and inlet attack angle of the rotor; thus, the turbine efficiency effectively improves by 2.28%. Meanwhile, the optimized blade reduces the particle impingement velocity and probability on the rotor leading edge, and the erosion condition of the rotor leading edge decreases by 70%.
单级含尘烟道燃气轮机气动性能和防腐蚀特性的多目标优化研究
含尘能量回收涡轮机叶片的固体颗粒侵蚀对机组的运行经济性和安全性有很大影响。为减轻叶片的侵蚀,提高汽轮机的气动性能,基于试验设计法、遗传算法和 CFD 多相流模拟,开发了汽轮机级联的多目标优化方法。优化结果表明,定子和转子叶片数量以及叶片跨度为 50%时的后缘角是影响含尘水轮机效率和叶片冲蚀的主要参数。通过减少定子叶片数量和定子后缘圆周弯曲角,颗粒撞击定子后缘的撞击速度和撞击概率分别降低了 7.5%~16.8% 和 8.9%~46.2% 。此外,与原设计相比,通过调整转子的载荷分布和进气攻角,转子级联的分流损失和二次流强度得到了抑制,从而使涡轮效率有效提高了 2.28%。同时,优化后的叶片降低了颗粒对转子前缘的撞击速度和概率,转子前缘的侵蚀状况降低了 70%。
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