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发散冷却与槽缝射流对涡轮静叶端壁气热性能影响的研究
引用本文:孙添一,李志刚,李军.发散冷却与槽缝射流对涡轮静叶端壁气热性能影响的研究[J].推进技术,2022,43(8):83-92.
作者姓名:孙添一  李志刚  李军
作者单位:西安交通大学 能源与动力工程学院 陕西 西安,西安交通大学 能源与动力工程学院 陕西 西安,西安交通大学 能源与动力工程学院 陕西 西安
基金项目:国家自然科学基金(51936008)和(51776151)
摘    要:燃烧室壁面发散冷却气流影响下游涡轮静叶端壁的气热性能,论文采用数值求解三维Reynolds-Averaged Navier-Stokes(RANS)方程和SST湍流模型的方法研究了燃烧室壁面发散冷却和前缘槽缝射流作用下的涡轮静叶端壁流动结构和传热冷却特性。分析了3种发散冷却流量质量比和3种前缘槽缝射流质量流量比下的涡轮静叶端壁绝热有效度、静叶叶片泛冷却特性和叶栅流动结构。研究表明:在3种发散冷却气质量比工况下,槽缝射流质量流量比由1.0%增加至1.5%时,整体绝热冷却有效度可至少提升60%,且叶片前缘与压力面角区也得到充分冷却;发散冷却质量流量比增加会改善叶栅出口下游部分端壁冷却效果。上游发散孔流量大于下游孔且槽缝吸力面侧局部质量流量比高于滞止点附近位置,发散冷却与槽缝射流流量增加能够减小冷却气流量局部差异。发散冷却与槽缝射流流量增加会削弱马蹄涡,增强空腔涡,并对二次涡产生影响,从而改变冷却气流覆盖特性。静叶端壁气热性能的研究需要考虑上游燃烧室壁面发散冷却的影响,论文的工作为涡轮静叶端壁冷却性能分析提供了参考。

关 键 词:涡轮静叶  端壁  发散冷却  槽缝射流  气热性能
收稿时间:2021/3/18 0:00:00
修稿时间:2022/6/7 0:00:00

Effects of Effusion Cooling and Slot Jet Flow on Aerothermal Performance of Turbine Vane Endwall
SUN Tian-yi,LI Zhi-gang,LI Jun.Effects of Effusion Cooling and Slot Jet Flow on Aerothermal Performance of Turbine Vane Endwall[J].Journal of Propulsion Technology,2022,43(8):83-92.
Authors:SUN Tian-yi  LI Zhi-gang  LI Jun
Abstract:Effusion cooling of combustor wall impacts on the aerothermal performance of the downstream turbine vane endwall. The flow structures and heat transfer cooling characteristics of turbine vane endwall under the influence of combustor wall effusion cooling and leading edge slot jet is numerically investigated using three-dimensional Reynolds-Averaged Navier-Stokes (RANS) and SST turbulence model. The adiabatic cooling effectiveness of endwall, vane phantom cooling performance and flow structures of turbine vane cascade are compared and analyzed at three kinds of effusion cooling mass flow rates (MFRE) and three kinds of slot jet mass flow rates (MFRS). The obtained results show that the overall adiabatic cooling effectiveness of turbine vane endwall increases up to more than 60% when the MFRS increase from 1.0% to 1.5% at three kinds of MFRE. In addition, the regions near vane leading-edge and corner zone of the pressure surface can be covered by coolant. The increase of MFRE can improve the cooling performance of the endwall downstream of the turbine vane outlet. The coolant flow rate of the upstream effusion holes usually is larger than that of the downstream holes. The coolant flow rate of the slot jet near the suction side is larger than that of stagnation region near the leading edge. These local mass flow rate difference decreases with the MFRE and MFRS increases. The increase of the MFRE and MFRS can weaken the horse-shoe vortex strength and enhance the cavity vortex strength, as well as influence the secondary vortex. This flow behavior would have impacts on the coolant coverage characteristics. Investigation on the aerothermal performance of turbine vane endwall should consider the influence of the upstream effusion cooling of combustor. This work provide reference of the cooling characteristics analysis of turbine vane endwall.
Keywords:Turbine Vane  Endwall  Effusion Cooling  Slot Jet  Aerothermal Performance
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