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Investigation of an IC Engine Intake Flow Based on Highly Resolved LES and PIV

Buhl, S. and Hartmann, F. and Kaiser, S. A. and Hasse, C. (2017):
Investigation of an IC Engine Intake Flow Based on Highly Resolved LES and PIV.
72, In: Oil & Gas Science and Technology : Revue de l'Institut Francais du Petrole, (3), Institut Français du Pétrole (IFP) ; EDP Sciences, p. 15, ISSN 1953-8189, DOI: 10.2516/ogst/2017012,
[Online-Edition: https://doi.org/10.2516/ogst/2017012],
[Article]

Abstract

To reduce emissions and fuel consumption, the current generation of gasoline engines uses technologies such as direct injection, downsizing and supercharging. All of them require a strong vortical in-cylinder charge motion, usually described as “tumble”, to improve fuel-air mixing and enhance flame propagation. The tumble development strongly depends on the flow field during the intake stroke. This flow field is dominated by the intake jet, which has to be captured well in the simulation. This work investigates the intake jet on a steady-state flow bench, especially in the vicinity of the intake valve. At first, the general flow dynamics of the intake jet for three different valve lifts and three different mass flows were investigated experimentally. For the smallest valve lift (3 mm), flow-field measurements using Particle Image Velocimetry (PIV) show that the orientation of the intake jet significantly depends on the air flow rate, attaching to the pent roof for low flow rates. This phenomenon is less pronounced for higher valve lifts. An intermediate valve lift and flow rate were chosen for further investigations by scale-resolving simulations. Three different meshes (coarse, medium and fine) and two turbulence models (Sigma and Detached Eddy Simulation-Shear Stress Transport (DES-SST)) are applied to consider their effect on the numerical results. An ad-hoc post-processing methodology based on the ensemble-averaged velocity field is presented capturing the jet centerline’s mean velocity and velocity fluctuations as well as its orientation, curvature and penetration depth. The simulation results are compared to each other as well as to measurements by PIV.

Item Type: Article
Erschienen: 2017
Creators: Buhl, S. and Hartmann, F. and Kaiser, S. A. and Hasse, C.
Title: Investigation of an IC Engine Intake Flow Based on Highly Resolved LES and PIV
Language: English
Abstract:

To reduce emissions and fuel consumption, the current generation of gasoline engines uses technologies such as direct injection, downsizing and supercharging. All of them require a strong vortical in-cylinder charge motion, usually described as “tumble”, to improve fuel-air mixing and enhance flame propagation. The tumble development strongly depends on the flow field during the intake stroke. This flow field is dominated by the intake jet, which has to be captured well in the simulation. This work investigates the intake jet on a steady-state flow bench, especially in the vicinity of the intake valve. At first, the general flow dynamics of the intake jet for three different valve lifts and three different mass flows were investigated experimentally. For the smallest valve lift (3 mm), flow-field measurements using Particle Image Velocimetry (PIV) show that the orientation of the intake jet significantly depends on the air flow rate, attaching to the pent roof for low flow rates. This phenomenon is less pronounced for higher valve lifts. An intermediate valve lift and flow rate were chosen for further investigations by scale-resolving simulations. Three different meshes (coarse, medium and fine) and two turbulence models (Sigma and Detached Eddy Simulation-Shear Stress Transport (DES-SST)) are applied to consider their effect on the numerical results. An ad-hoc post-processing methodology based on the ensemble-averaged velocity field is presented capturing the jet centerline’s mean velocity and velocity fluctuations as well as its orientation, curvature and penetration depth. The simulation results are compared to each other as well as to measurements by PIV.

Journal or Publication Title: Oil & Gas Science and Technology : Revue de l'Institut Francais du Petrole
Volume: 72
Number: 3
Publisher: Institut Français du Pétrole (IFP) ; EDP Sciences
Divisions: 16 Department of Mechanical Engineering > Simulation of reactive Thermo-Fluid Systems (STFS)
16 Department of Mechanical Engineering
Date Deposited: 16 Nov 2017 13:09
DOI: 10.2516/ogst/2017012
Official URL: https://doi.org/10.2516/ogst/2017012
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