Numerical investigation into the effects of design parameters on the flow characteristics in a turbine exhaust diffuser

Byung Ju Lee, Jin Taek Chung

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, we numerically investigated the effects of design parameters, such as the strut geometry or diffusion angle, on the performance of an industrial turbine exhaust diffuser. Turbine exhaust diffusers are commonly used to change the kinetic energy of exhaust gases from the outlet of turbine stages into the static pressure. The turbine exhaust diffuser investigated in this work consisted of an annular diffuser with five identical struts equally spaced around the front circumference and a conical diffuser with a hub extension at the rear. Four design parameters were considered and several values for each parameter were tested in this study. The aerodynamic performances of the studied diffusers were evaluated according to their pressure recovery coefficients and rates of total pressure loss. Contours for the velocity, pressure, and entropy increase were plotted and compared for the various diffuser shapes. The numerical results showed that the strut thickness and the axially swept angle of the strut significantly influence the aerodynamic performance of the turbine exhaust diffuser, whereas the strut lean angle and the diffuser hade angle are less important.

Original languageEnglish
Article number5171
JournalEnergies
Volume14
Issue number16
DOIs
Publication statusPublished - 2021 Aug

Keywords

  • Aerodynamic performance
  • Diffuser hade angle
  • Pressure recovery
  • Strut geometry
  • Turbine exhaust diffuser

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Control and Optimization
  • Electrical and Electronic Engineering

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