Steady flow and dynamic analyses comparison of an air intake breathing capacity

Nur Adila Mohamad Shafie,Zulkarnain Abdul Latiff,Mohd Farid Muhamad Said,Noreffendy Tamaldin,Azhar Abdul Aziz,Ahmad Kamal Mat Yamin

doi:10.1051/matecconf/20179001067

Nur Adila Mohamad Shafie, Zulkarnain Abdul Latiff + Show 4 more

Open Access

https://doi.org/10.1051/matecconf/20179001067

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Abstract

Analysis of intake breathing capacity is important in order to determine the performance output for any respective engine. Flow coefficient and discharge coefficient are the common parameters used to define the breathing capability and different analysis have been applied by researchers to determine these parameters which include experiments and Computational Fluid Dynamics (CFD) analyses. This study aims to investigate the difference in breathing parameters obtained from steady flow simulation and dynamics simulation. Proton CAMPRO 1.6-litre engine was selected as the reference engine in this study. The experiment involved was the flow bench test, while CFD simulation carried out were the port flow analysis (steady flow) and the cold flow analysis (dynamics). Results obtained indicate that flow coefficient and discharge coefficient from cold flow simulation are always lower than both parameter values obtained from port flow simulation and experiment with large deviations of minimum 15.6% and maximum 27%. Meanwhile, the breathing parameter values from port flow simulation were very close to the experimental data with the minimum deviation of 1.6%. This study concludes that port flow simulation is very accurate for the analysis of defining intake breathing capacity, meanwhile cold flow simulation can be used to predict the trend and lower limit of these parameters especially at low valve lift.

Highlights

As the most important aspect of the automobile system, engine performance is analysed in details in fulfilling the important parameters which include geometrical properties and different engine efficiencies
It has been defined that discharge coefficient and flow coefficient from steady flow analysis can represent real operation of car engine as long as it is under normal speed range [1]
Each simulation type differs from each other based on the operations and the output. It was computed by means of port flow simulation while cold flow simulation was computed for dynamics analysis of breathing parameter

Summary

Introduction

As the most important aspect of the automobile system, engine performance is analysed in details in fulfilling the important parameters which include geometrical properties and different engine efficiencies. In the effort of improving engine system, CFD simulation has emerged from years ago as an alternative and has been used alongside other methods which include Particle Image Velocimetry (PIV) and flow bench test. In analysing the intake air suction of engine, questions have surfaced on whether the steady flow test can accurately determine the engine breathing parameters of a moving car. Research by Balasankar et al [3] had discussed on the optimization of intake port in order to improve the engine performance. Intake flow data was compared with the flow bench test, and the research proceeded into optimization of port geometry by DOE analysis. Balasankar et al [3] had presented good correlation between port flow simulation and flow bench test, leading to a conclusion that CFD simulation is a reliable method to replace the conventional method of engine intake analysis

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