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research-article

Investigations on the Sealing Effectiveness and Unsteady Flow Field of 1.5-Stage Turbine Rim Seal

[+] Author and Article Information
Shuxian CHEN

Institute of Turbomachinery, Xi'an Jiaotong University, Xi'an 710049, China
531256803@qq.com

Zhigang LI

Institute of Turbomachinery, Xi'an Jiaotong University, Xi'an 710049, China
zhigangli@mail.xjtu.edu.cn

Jun LI

Institute of Turbomachinery, Xi'an Jiaotong University, Xi'an 710049, China
junli@mail.xjtu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4042422 History: Received April 27, 2018; Revised December 27, 2018

Abstract

This paper presents a numerical investigation on the sealing effectiveness and unsteady flow field of a 1.5-stage turbine with the front and aft wheel-space cavities. The sealing effectiveness and flow structure are studied by solving three dimensional Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations and SST turbulence model. The numerical pressure and swirl ratio distributions in cavities with two computational models are compared with experimental data to determine the position of stationary/rotating domain interface. The unsteady results agree well with experimental data. The effects of coolant flow rates on the sealing effectiveness and the flow field of the rim seal at the front and aft cavities are investigated. The obtained results show that the sealing effectiveness of the rim seal at the aft cavity is much larger than that of the rim seal at the front cavity at the same coolant flow rate. The less mainstream pressure fluctuation near the aft rim seal clearance and the clockwise vortex due to the pumping effect in the aft rim seal leads to this result. The mainstream pressure fluctuation downstream of the blade and the sealing effectiveness of the rim seal at the aft cavity under five operating conditions are computed. It shows that the square root of the mainstream pressure fluctuation amplitude downstream of the blade is proportional to the mainstream flow rate. The increase of the mainstream flow results in gradually decrease of the sealing effectiveness of the rim seal at the aft cavity.

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