(2-05) The Lean Boost System : A Gasoline Engine with Performance and Improved Economy((SI-2)S. I. Engine Combustion 2-Direct Injection Engines)

2001 ◽  
Vol 01.204 (0) ◽  
pp. 26
Author(s):  
Tim Lake ◽  
John Stokes ◽  
Richard Osborne
Keyword(s):  
Gasoline Engine ◽  
Direct Injection ◽  
Direct Injection Engines ◽  
System A ◽  
Engine Combustion

Flow and Mixture Distribution in a High-Speed Five-Valve Direct Injected Gasoline Engine

2006 ◽  
Vol 7 (2) ◽  
pp. 143-166 ◽  
Author(s):  
N Kampanis ◽  
C Arcoumanis ◽  
S Kometani ◽  
R Kato ◽  
H Kinoshita
Keyword(s):  
High Speed ◽  
Large Scale ◽  
Gasoline Engine ◽  
Flow Instability ◽  
Direct Injection ◽  
Mixture Distribution ◽  
Direct Injection Engines ◽  
Planar Laser ◽  
Performance And Emissions ◽  
Cylinder Flow

The in-cylinder flow, spray dynamics, air-spray interaction, and fuel vapour distribution have been characterized in a motorcycle five-valve gasoline engine in terms of their effect on performance and emissions. A five-valve single-cylinder optical engine was employed which operated at speeds up to 3000 r/min in the close spacing configuration, with an early induction injection strategy using a centrally mounted swirl pressure atomizer. Particle image velocimetry, spray imaging in a spray chamber and in the engine, and planar laser-induced fluorescence revealed the importance of a strong and ordered in-cylinder flow for the efficient distribution of the liquid fuel throughout the cylinder volume and its complete evaporation prior to combustion, especially in the relatively low speed regime investigated. Furthermore, in the absence of a large-scale vortex structure during compression, incomplete mixing may still occur, resulting in mixture inhomogeneities and flow instability. Consequently, in contrast to port fuel injected engines, where good mixing could be achieved at high revolution rates, even with an unstructured flow, in direct injection engines an ordered flow structure is a prerequisite for efficient combustion and low exhaust emissions.

scholarly journals Collaborative investigation of the internal flow and near-nozzle flow of an eight-hole gasoline injector (Engine Combustion Network Spray G)

2020 ◽  
pp. 146808742091844
Author(s):  
Chinmoy K Mohapatra ◽  
David P Schmidt ◽  
Brandon A Sforozo ◽  
Katarzyna E Matusik ◽  
Zongyu Yue ◽  
...  
Keyword(s):  
Direct Injection ◽  
Internal Flow ◽  
Gasoline Direct Injection ◽  
Two Phase ◽  
Direct Injection Engines ◽  
Fuel Injectors ◽  
Engine Combustion ◽  
Injector Flows ◽  
Eulerian Modeling ◽  
The Impact

The internal details of fuel injectors have a profound impact on the emissions from gasoline direct injection engines. However, the impact of injector design features is not currently understood, due to the difficulty in observing and modeling internal injector flows. Gasoline direct injection flows involve moving geometry, flash boiling, and high levels of turbulent two-phase mixing. In order to better simulate these injectors, five different modeling approaches have been employed to study the engine combustion network Spray G injector. These simulation results have been compared to experimental measurements obtained, among other techniques, with X-ray diagnostics, allowing the predictions to be evaluated and critiqued. The ability of the models to predict mass flow rate through the injector is confirmed, but other features of the predictions vary in their accuracy. The prediction of plume width and fuel mass distribution varies widely, with volume-of-fluid tending to overly concentrate the fuel. All the simulations, however, seem to struggle with predicting fuel dispersion and by inference, jet velocity. This shortcoming of the predictions suggests a need to improve Eulerian modeling of dense fuel jets.

A Novel Air and EGR Emulation Facility for the Optimisation of the Powertrain Architecture

2019 ◽  
Author(s):  
Simon Orchard ◽  
Umud Ozturk ◽  
Nick Evans ◽  
Tomasz Duda ◽  
Ed Chappell ◽  
...  
Keyword(s):  
Boundary Conditions ◽  
Gasoline Engine ◽  
Transient Flow ◽  
Direct Injection ◽  
Engine Design ◽  
Wide Range ◽  
Engine Combustion ◽  
Direct Injection Gasoline Engine ◽  
And Control ◽  
Engine Map

Abstract In this work, an external air and EGR emulation facility has been designed that can replicate a wide range of boosting and EGR delivery systems to a multi-cylinder engine platform. The facility works by removing the incumbent air path and replacing it with externally boosted fresh air that is conditioned using a transient flow and temperature controller. The facility also recycles the actual exhaust gases from the engine whilst removing the constraints of required pressure differences to drive this flow. The resulting system is able to control the boundary conditions of intake air flow - pressure and temperature, engine back-pressure and EGR flow rate independently. Three testing approaches have been described that allow to obtain valuable data across a wide range of the engine map (based on an example of a 1.0L direct injection gasoline engine) also beyond its typical hardware related limits. The facility is designed to be used as part of an engine design optimisation process. The facility generates data of the engine combustion system independently of the associated air path subsystems and excites the boundary conditions beyond those that would be expected from a specific air path design. The data is then used to populate 1D engine models which can be confidently used to predict the performance of a specific air path hardware combination and control strategy.

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