Computational study of a radial flow turbine operates under various pulsating flow shapes and amplitudes

Ahmed Rezk, Sidharth Sharma, Simon Barrans, A K hossain, Muhammad Imran

Research output: Contribution to journalArticlepeer-review


Radial flow turbines are extensively used in turbocharging technology due to their unique capability of handling a wide range of exhaust gas flow. The pulsating flow nature of the internal combustion engine exhaust gases causes unsteady operation of the turbine stage. This paper presents the impact of the pulsating flow of various characteristics on the performance of a radial flow turbine. A three-dimensional computational fluid dynamic model was coupled with a one-dimensional engine model to study the realistic pulsating flow. Applying square wave pulsating flow showed the highest degree of unsteadiness corresponding to 92.6% maximum mass flow accumulation due to the consecutive sudden changes of the mass flow rates over the entire pulse. Although saw-tooth showed a maximum mass flow accumulation value of 88.9%, the mass flow rates entailed gradual change resulted in the least overall mass flow accumulation over the entire pulse. These two extremes constrained the anticipated performance of the radial flow turbine operates under realistic pulsating flow. Such constraints could develop an operating envelop to predict the performance and optimize radial flow turbines' power extraction under pulsating flow conditions.
Original languageEnglish
Article number120904
Number of pages13
JournalJournal of Energy Resources Technology
Issue number12
Early online date19 May 2021
Publication statusPublished - Dec 2021

Bibliographical note

©2021 ASME


  • Performance Prediction
  • CFD simulation
  • Pulsating flow prediction
  • Radial turbine efficiency
  • Turbine modelling
  • Turbocharger


Dive into the research topics of 'Computational study of a radial flow turbine operates under various pulsating flow shapes and amplitudes'. Together they form a unique fingerprint.

Cite this