Imperial College London
Alternate

ProfessorRicardoMartinez-Botas

Faculty of Engineering, Department of Mechanical Engineering

Associate Dean Industry Partnerships,Prof of Turbomachinery
 
 
 
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Contact

 

+44 (0)20 7594 7241r.botas Website

 
 
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Location

 

611City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@inproceedings{Barrera-Medrano:2018,
author = {Barrera-Medrano, ME and Martinez-Botas, R and Tomita, I and Ibaraki, S},
pages = {101--125},
title = {On the effect of engine pulsations on the performance of a turbocharger centrifugal compressor},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - CPAPER
AB  - In an IC engine, the centrifugal compressor is placed upstream of the inlet manifold and therefore, it is exposed an unsteady flow regime caused by the inlet valves of the cylinder arrangement. This valve motion sets a pulsating state at the compressor exit, having greater influence when the operation is near the surge margin of the compressor; it may therefore limit further the engine minimum flow rate. This paper presents the experimental results of the evaluation of the surge dynamics on a compressor with induced downstream pulsating flow. Different pulsation levels are achieved by the variation of four different parameters on the induced pulse: pulse frequency, amplitude, the presence of a storage volume (plenum) and pulse location. Each of the four pulse parameters was evaluated independently in order to assess its effect on the compressor stability limit. The main effect on the surge margin of the compressor has been found to be due to the presence of a volume in the system for all cases, whether steady or unsteady/pulsating condition, and at all frequencies. It was found that the magnitude of the pulse frequency determines the hysteresis behaviour of the system that leads to a phase difference between the convected terms (volume flow) and the acoustic dominated terms (pressure), and therefore this affects the onset of flow instability, surge, in the compression system under study. Based on these results, the compressor performance, and particularly its stability limit, is strongly influenced by the downstream conditions of the system where the compressor is placed. The nature of downstream conditions influences the compressor characteristic curve, and in some cases the compressor "feels" like another machine just by means of varying the downstream state at the compressor exit. The presence of a pulsating state at the compressor outlet increases the inertia of the compression system and thus it affects the compressor transient response. The outlet pu
AU  - Barrera-Medrano,ME
AU  - Martinez-Botas,R
AU  - Tomita,I
AU  - Ibaraki,S
EP  - 125
PY  - 2018///
SP  - 101
TI  - On the effect of engine pulsations on the performance of a turbocharger centrifugal compressor
ER  -
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