Abstract

A turbocharger unit for diesel engine is often equipped with a built-in online water washing system and its performance is not always satisfactory because of efficiency declination due to deposit accumulated on blade surfaces not being washed away. In this study, a systematic approach of using experimental measurements and computational fluid dynamics (CFD) is adopted to analyse liquid/gas two-phase flow associated with a turbocharger water washing system, in order to understand the underlying flow physics. A medium-sized diesel engine turbocharger configuration is chosen for this purpose. Experiments are focussed on blade surface temperature measurements, while CFD modelling with a coupled Eulerian/Lagrangian method is used for capturing the complex gas/liquid two-phase flow behaviours inside the induction duct and the blade passage. It was found that numerical predictions are in a good agreement with experimental data in terms of temperature distributions of the blade leading edge region and water coverage over the blade ring. Other flow features such as the water droplet trajectories and the particle size distributions are also explored and analysed in further details, and they are useful for understanding the deposit removal mechanism.

Highlights

  • The power output efficiency of diesel engines has been increased considerably over the last few decades, with the help of developing innovative turbocharger concept

  • There is a need to assess the consequence of using heavy-duty fuel on diesel engine performance, so that, this study focuses on deposit removal technique by water washing method through experimental and computational fluid dynamics analysis of water/air two-phase flow

  • The pocket of water droplet trajectory is very important for an understanding of the liquid breakup process, and the modelling visualisation of droplet trajectory by isosurfaces is given to confirm the conical shape of the liquid spray

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Summary

Introduction

The power output efficiency of diesel engines has been increased considerably over the last few decades, with the help of developing innovative turbocharger concept. This is evident in the ship and the rail propulsion applications as well as the power generation industry [1]. Higher contamination in this kind of low-grade fuel can cause serious corrosion and deposit accumulation that will damage the turbine blade, leading to the degradation of its aerodynamic performance. There is a need to assess the consequence of using heavy-duty fuel on diesel engine performance, so that, this study focuses on deposit removal technique by water washing method through experimental and computational fluid dynamics analysis of water/air two-phase flow

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