Material Selection for Dynamic Variable Geometry Turbocharger Flow Control Application
Journal Title: International Journal of Automotive Engineering and Technologies - Year 2015, Vol 4, Issue 2
Abstract
This paper investigates nozzle material candidates for use in a turbocharger turbine technology known as the active control turbocharger (ACT) which is a distinct technology to the Variable Geometry Turbine (VGT) for turbochargers, but broadly based on this technology. In this concept an actuated nozzle mechanism is oscillated to provide a continuous change of the turbine inlet area in response to the instantaneous exhaust gas flow pulsating characteristics to provide greater extraction of exhaust gas pulse energy. Careful materials selection is required for this application to overcome the creep, fatigue, oxidation and high temperature challenges associated with the diesel engine exhaust conditions to which the nozzle is exposed to. The investigation of materials suitability for this application was conducted for steady and transient flow conditions. It was found that the nozzle vane undergo cyclical loading at a maximum stress of 58 MPa for 109 cycles of operation at an inlet temperature of 800oC and pressure of 240 kPa.
Authors and Affiliations
Apostolos Pesiridis*| School of Engineering and Design, Brunel University London, Srithar Rajoo| Transport Research Alliance, Universiti Teknologi Malaysia, Kishokanna Paramasivam| Transport Research Alliance, Universiti Teknologi Malaysia, Ricardo Martinez-Botas| Department of Mechanical Engineering, Imperial College London, Robert Macnamara| BP, Houston, TX, 77079, USA
Keywords
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