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Journal of Thermal Science

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2022 , Vol. 31 >Issue 5: 1790 - 1803

DOI: https://doi.org/10.1007/s11630-022-1673-y

气动

Numerical Investigation of a Turbine Stator with Nonaxisymmetric Endwall Profiling

  • LIU Wei ,
  • WANG Songtao ,
  • WEN Fengbo
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  • School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

网络出版日期: 2023-12-01

基金资助

The author(s) gratefully acknowledges the support of the National Science and Technology Major Project of China (No. 2017-I-0005-0006), and the Outstanding Youth Science Foundation of Heilongjiang Province of China (No. YQ2020E016).

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Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022
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Numerical Investigation of a Turbine Stator with Nonaxisymmetric Endwall Profiling

  • LIU Wei ,
  • WANG Songtao ,
  • WEN Fengbo
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  • School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Online published: 2023-12-01

Supported by

The author(s) gratefully acknowledges the support of the National Science and Technology Major Project of China (No. 2017-I-0005-0006), and the Outstanding Youth Science Foundation of Heilongjiang Province of China (No. YQ2020E016).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022
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摘要

非轴对称端壁是减少二次流损失、提高气动性能的有效方法。本文提出了一种基于非均匀有理B样条曲面(NURBS)技术的非轴对称端壁自动优化方法，采用该方法对涡轮静叶上端壁进行气动优化，以减少总压力损失和二次流损失。对基准端壁设计（Datum）和优化端壁设计（Opt）的流场进行了研究和比较。采用损失分解的方法对损失定量分析，将熵产损失分为叶型损失、二次流损失和尾缘损失。非轴对称端壁优化减少了以上三种损失，其中二次流损失远小于叶型损失，总熵产损失下降了11.7%。结果表明，优化后的端壁设计使总压损和二次流动能系数分别降低了11.1%和11.0%，其中二次流动能降低是由于马蹄涡的减弱和横向压力梯度的减少。当出口马赫数和来流攻角发生变化时，优化端壁的性能始终优于基准端壁。非轴对称端壁的级效率提高了 0.28%。

关键词： turbine; optimization; nonaxisymmetric endwall; entropy loss

本文引用格式

LIU Wei , WANG Songtao , WEN Fengbo . Numerical Investigation of a Turbine Stator with Nonaxisymmetric Endwall Profiling[J]. 热科学学报, 2022 , 31(5) : 1790 -1803 . DOI: 10.1007/s11630-022-1673-y

Abstract

Nonaxisymmetric endwall is an effective method to reduce secondary loss and improve aerodynamic performance. In this paper, a nonaxisymmetric endwall automated optimization process based on the nonuniform rational B-spline surface (NURBS) technique was proposed. This technique was applied for the aerodynamic optimization of the turbine stator shroud endwall to reduce total pressure loss and secondary kinetic energy. The flow fields of the datum endwall design (Datum) and optimization endwall design (Opt) were investigated and compared. Quantitative loss analysis was performed with a loss breakdown method. The entropy generation was classified as profile loss, secondary loss and trailing edge loss, all of which were reduced. The secondary loss was much smaller than the profile loss. In general, the blade row total entropy loss decreased by 11.7%. The results showed that the Opt design reduced total pressure loss and coefficient of secondary kinetic energy by 11.1% and 11.0%, respectively. The decrease in secondary kinetic energy could be attributed to the reduction in the horseshoe vortex and the reduced transverse pressure gradient. When the outlet Mach numbers and inlet incidence angles vary, the performance of the profiled endwall design was always better than the datum design. In the turbine stage simulation, the efficiency was increased by 0.28% with nonaxisymmetric endwall.

Key words： turbine; optimization; nonaxisymmetric endwall; entropy loss

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