端壁侧向出流对透平轮缘密封的影响及优化

推进技术 ›› 2014, Vol. 35 ›› Issue (6): 758-765.

端壁侧向出流对透平轮缘密封的影响及优化

吴康,林立,任静,蒋洪德

清华大学热能工程系，北京 100084;清华大学热能工程系，北京 100084;清华大学热能工程系，北京 100084;清华大学热能工程系，北京 100084

发布日期:2021-08-15
作者简介:吴康(1987—)，男，博士生，研究领域为燃气轮机空气系统。E-mail:wu-k09@mails.tsinghua.edu.cn

Analysis and Optimization of Interaction between Endwall Flank Flow and Turbine Rotor-Stator Rim Seal

Department of Thermal Engineering，Tsinghua University，Beijing 10084，China;Department of Thermal Engineering，Tsinghua University，Beijing 10084，China;Department of Thermal Engineering，Tsinghua University，Beijing 10084，China;Department of Thermal Engineering，Tsinghua University，Beijing 10084，China

Published:2021-08-15

摘要/Abstract

摘要： 在燃气轮机的设计研究中，用于冷却静叶端壁的气体会有一部分从端壁的侧面沿轴向流出，这部分气体恰恰处在轮缘间隙密封流体和主流的交互作用区。采用数值模拟的方法研究了真实工况下端壁侧向出流与动静叶间隙密封流的相互影响，分析了其作用机理并在此基础上提出了一种新型的非均匀布置出流孔结构。结果表明端壁侧向出流能够抑制主流侵入涡系的大小和深度，当端壁侧向出流量 R m =10%能够将密封间隙冷却60～80K；新提出的非均匀布置端壁侧向出流孔结构能改善对静叶尾缘附近这些燃气入侵严重区域的密封效果， R m =10%的情况下非均匀出流形式在静叶尾缘区域的密封效率能够提高3%左右。

关键词: 透平转静轮缘；燃气入侵；端壁侧向出流；非均布出流孔；密封效率

Abstract: For certain gas turbines，parts of endwall cooling flow go out of its side axially and mix with sealing flow. This mixing process happens in rotor stator clearance where main flow and sealing flow interacts. Therefore，it is very important in gas turbine rim seal design. A validated numerical method was used to investigate the interaction mechanism between endwall flank flow and sealing flow under the influence of external flow，and one new and more efficient hole distribution structure named as non-uniform distribution holes was presented and studied. It is found that endwall flank flow can increase sealing effectiveness by restraining the size and depth of ingestion bubbles size and the cooling effect for rotor stator clearance is 60～80K when endwall flank flow rate is R m =10%. Non-uniform distribution hole can optimize the sealing effectiveness about 3% around the vane trailing edge where more serious hot gas ingestion happens.

Key words: Turbine rotor stator clearance；Hot gas ingress；Endwall flank flow；Non-uniform distribution holes；Sealing effectiveness

吴康,林立,任静,蒋洪德. 端壁侧向出流对透平轮缘密封的影响及优化[J]. 推进技术, 2014, 35(6): 758-765.

WU Kang,LIN Li,REN Jing,JIANG Hong-de. Analysis and Optimization of Interaction between Endwall Flank Flow and Turbine Rotor-Stator Rim Seal[J]. Journal of Propulsion Technology, 2014, 35(6): 758-765.

参考文献

[1] Owen J M. Prediction of Ingestion through Turbine Rim Seals. Part 1: Rotationally-Induced Ingress [ R ] . ASME 2009- GT- 59121.
[2] Owen J M. Prediction of Ingestion through Turbine Rim Seals Part 2: Externally-Induced and Combined Ingress [ R ] . ASME 2009- GT -59122.
[3] Rogers R H，Owen J M. Flow and Heat Transfer in Rotating-Disc Systems，Volume 1—Rotor Stator Systems [ M ] . UK: Research Studies Press Ltd，Taunton ，1988.
[4] Phadke U P，Owen J M. Aerodynamic Aspects of the Sealing of Gas-Turbine Rotor-Stator Systems，Part1: The Behavior of Simple Shrouded Rotating-Disk System in a Quiescent Environment [ J ] . International Journal Heat and Fluid Flow ，1988，9(2).
[5] Abe T，Kikuchi J. An Investigation of Turbine Disc Cooling ( Experimental Investigation and Observation of Hot Gas Flow into a Wheelspace) [ C ] . USA: The 3rd CIMAC Conference，GT -30，1979.
[6] Phadke U P，Owen J M. Aerodynamic Aspects of the Sealing of Gas-Turbine Rotor-Stator Systems，Part2: The Effect of Nonaxisymmetric External Flow on Seal Performance [ J ] . International Journal Heat and Fluid Flow ，1988， 9(2).
[7] Phadke U P，Owen J M. Aerodynamic Aspects of the Sealing of Gas-Turbine Rotor-Stator Systems，Part3: The Performance of Simple Seals in a Quiescent External Flow [ J ] . International Journal Heat and Fluid Flow ，1988，9(2).
[8] Bohn D，Rudzinski B. Influence of Rim Seal Geomertry on Hot Gas Ingestion into the upstream Cavity of an Axial Turbine Stage [ R ] . ASME 99- GT -248.
[9] Bohn D，Bernd Rudzlnskl，Norbert. Experimental and Numerical Investigation of the Influence of Rotor Blades on Hot Gas Ingestion into the Upstream Cavity of an Axial Turbine Stage [ R ] . ASME 2000- GT -0284.
[10] Bohn D，Michael Wolff，Improved Formulation to Determine Minimum Sealing Flow–Cw，Min–for Different Sealing Configurations [ R ] . ASME 2003- GT -38465.
[11] Bhon D，Achim Decker Hongwei Ma. Influence of Sealing Air Mass Flow on The Velocity Distribution in and Inside the Rim Seal of The Upstream Cavity of A 1. 5-Stage Turbine [ R ] . ASME 2003- GT -38459.
[12] Bhon D，Joachim Funcke Achim Decker. Numerical Simulation of the unsteady Flow Field in an Axial Gas Turbine Rim Seal Configuration [ R ] . ASME 2004- GT -53829.
[13] Chew J W. A Theoretical Study of Ingress for Shrouded Rotating Disk Systems with Radial Outflow [ J ] . Journal of Turbomachinery ，1991，113:91-97.
[14] Johnson B V，Mack G J R，Daniels W A. Turbine Rim Seal Gas Path Flow Ingestion Mechanisms [ R ] . AIAA 94-2703.
[15] Mirzamoghadam A V，Heitland G，Morris M C，et al. 3D CFD Ingestion Evaluation of a High Pressure Turbine Rim Seal Disk Cavity [ R ] . ASME 2008- GT -50531.
[16] Zhou K，Wilson M，Lock G D，et al. Computation of Ingestion through Gas Turbine Rim Seals [ R ] . ASME 2011- GT -45314.
[17] Rabs M，Benra F K，Dohmen H J，et al. Investigation of Flow Instabilities near the Rim Cavity of a 1. 5 Stage Gas Turbine [ R ] . ASME 2011- GT -45314.