Search:
Computing and Library Services - delivering an inspiring information environment

The influence of pulse shape on the performance of a mixed flow turbine for turbocharger applications

Lee, Samuel Peter, Rezk, Ahmed, Jupp, Martyn and Nickson, Keith (2017) The influence of pulse shape on the performance of a mixed flow turbine for turbocharger applications. International Journal of Mechanical Engineering and Robotics Research. ISSN 2278-0149 (In Press)

[img]
Preview
PDF - Accepted Version
Download (757kB) | Preview
Official URL: http://www.ijmerr.com/

Abstract

Engine downsizing allows automotive manufactures to achieve improved efficiency and reduce emissions. Turbocharging can increase the power density of the engine, and therefore plays a vital role in downsizing. Due to the nature of the reciprocating engine, a turbocharger turbine operates in a highly unsteady environment. This paper presents a computational investigation looking at the impact of pulse shape on the performance of a mixed flow turbine for turbocharger applications. While the impact of pulse frequency and amplitude on turbine unsteady performance has received significant attention in the past, little work has been done on the impact of the pulse shape. In the current study, four inlet pulse shapes have been investigated and shown to have a significant impact on turbine instantaneous performance, where efficiency and mass flow hysteresis varied significantly between test cases. This result shows for in-depth analyses of turbine flow physics and loss mechanisms, accurately modelling the inlet pulse shape is vital. The square pulse showed the most distinct impact with normalized cycle average efficiency decreasing by 1.37% and a 2.23% reduction in normalized stage MFP when compared to the sinusoidal wave. The variation in normalized cycle averaged stage efficiency was found to be less than 0.25% for the remaining three wave forms and the variation in normalized cycle averaged MFP less than 0.5%. This finding suggests that a simple sinusoidal wave form can be used for the majority of cycle-averaged performance comparisons.

Item Type: Article
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Schools: School of Computing and Engineering > Turbocharger Research Institute
School of Computing and Engineering
Related URLs:
Depositing User: Sam Lee
Date Deposited: 25 May 2017 14:11
Last Modified: 25 May 2017 18:33
URI: http://eprints.hud.ac.uk/id/eprint/32014

Downloads

Downloads per month over past year

Repository Staff Only: item control page

View Item View Item

University of Huddersfield, Queensgate, Huddersfield, HD1 3DH Copyright and Disclaimer All rights reserved ©