Numerical Investigation of the Wake Vortex-Related Flow Mechanisms in Transonic Turbines

Wang Guoliang; Ge Ning; Zhong Dongdong

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Numerical Investigation of the Wake Vortex-Related Flow Mechanisms in Transonic Turbines

机译：跨音涡轮机尾涡流相关流动机制的数值研究

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As the core equipment of the power generation system, a gas turbine is an indispensable energy-converting device in the national industry. The flow inside a high-pressure turbine (HPT) is highly unsteady, which has a great influence on the aerothermal performance and structural strength. To better clarify the flow mechanism and guide the advanced design, the basic flow characteristics of transonic turbines are investigated in the paper by a modified scale-adaptive simulation (SAS) model based on the shear stress transport (SST) turbulence model. The numerical results reveal the formation and development of the secondary flow structures such as wake vortex, pressure wave, shock wave, and the interactions among them. The length and frequency characteristics of wake are in good agreement with the large eddy simulation (LES) and the experimental data. Based on the detailed flow information, the local loss analysis is performed using the entropy generation rate. In summary, the wake vortex-related flow is the main origin of unsteadiness and entropy loss in high-pressure turbine cascade.

机译：作为发电系统的核心设备，燃气轮机是国家工业中必不可少的能量转换装置。高压涡轮机（HPT）内的流动非常不稳定，这对空气热性能和结构强度有很大影响。为了更好地阐明流动机构并引导先进的设计，通过基于剪切应力传输（SST）湍流模型的修改规模 - 自适应模拟，在纸上研究了跨音速涡轮机的基本流动特性。数值结果揭示了次级流动结构的形成和开发，例如唤醒涡旋，压力波，冲击波和它们之间的相互作用。唤醒的长度和频率特性与大涡模拟（LES）和实验数据吻合良好。基于详细的流量信息，使用熵生成速率进行局部损耗分析。总之，Wake Vortex相关的流动是高压涡轮机级联的不稳定和熵损失的主要起源。

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《International journal of aerospace engineering》 |2020年第2期|8825542.1-8825542.18|共18页
作者
Wang Guoliang; Ge Ning; Zhong Dongdong;
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Nanjing Univ Aeronaut & Astronaut Coll Energy & Power Engn Nanjing 210016 Peoples R China;

Nanjing Univ Aeronaut & Astronaut Coll Energy & Power Engn Nanjing 210016 Peoples R China;

Nanjing Univ Aeronaut & Astronaut Coll Energy & Power Engn Nanjing 210016 Peoples R China;

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Numerical Investigation of the Wake Vortex-Related Flow Mechanisms in Transonic Turbines

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