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Non-adiabatic pressure loss boundary condition for modelling turbocharger turbine pulsating flow

Chiong, Meng Soon and Rajoo, Srithar and Romagnoli, Alessandro and Costall, Aaron W. and Martinez-Bota, Ricardo (2015) Non-adiabatic pressure loss boundary condition for modelling turbocharger turbine pulsating flow. Energy Conversion And Magement, 93 . pp. 267-281. ISSN 0196-8904

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Official URL: http://dx.doi.org/10.1016/j.enconman.2014.12.058

Abstract

The pulse flow performance of a turbocharger turbine is known to be different than its corresponding steady flow performance. This often leads to less-than-satisfactory 1D engine model prediction. In this study, the effectiveness of a 1D pulse flow turbine model is assessed against experimental data with the aid of 3D CFD model. The turbine under study is a single-entry variable geometry mixed-flow turbine. The result shows highly comparable pulse flow swallowing capacity and actual power characteristics between 1D and 3D models. The over-prediction in 1D actual power magnitude is found to be due to the simplification of combining nThis paper presents a simplified methodology of pulse flow turbine modelling, as an alternative over the meanline integrated methodology outlined in previous work, in order to make its application to engine cycle simulation codes much more straight forward. This is enabled through the development of a bespoke non-adiabatic pressure loss boundary to represent the turbine rotor. In this paper, turbocharger turbine pulse flow performance predictions are presented along with a comparison of computation duration against the previously established integrated meanline method. Plots of prediction deviation indicate that the mass flow rate and actual power predictions from both methods are highly comparable and are reasonably close to experimental data. However, the new boundary condition required significantly lower computational time and rotor geometrical inputs. In addition, the pressure wave propagation in this simplified unsteady turbine model at different pulse frequencies has also been found to be in agreement with data from the literature, thereby supporting the confidence in its ability to simulate the wave action encountered in turbine pulse flow operation.ozzle and rotor stage pressure loss together.

Item Type:Article
Uncontrolled Keywords:modelling, non-adiabatic pressure loss, one-dimensional, turbine, turbocharger, unsteady flow
Subjects:A General Works
ID Code:58647
Deposited By: Haliza Zainal
Deposited On:04 Dec 2016 12:07
Last Modified:12 Mar 2017 14:44

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