Modelling rotary diesel fuel injection equipment with rate control to reduce noise and emissions
Modelling rotary diesel fuel injection equipment with rate control to reduce noise and emissions
Stringent legislation on vehicle noise and pollutant emissions has created increasingly severe demands on the fuel injection equipment fitted to automotive diesel engines. In particular, the use of high pressure across smaller nozzle holes to reduce particulate emissions has increased the effect of nonlinear compression of the fuel in the passages and volumes in the systems. Fuel cavitation has been increased by more vigorous wave action.
Both of these nonlinear effects have been investigated and modelled by replacing the pressure with condensation, which is continuous across the fuel phase boundary. The nonlinearity in compression has been incorporated into the wave equations by using a nonlinear equation of state where the bulk modulus is assumed to change linearly with pressure. The cavitated pipe section is divided into liquid and mixture columns and modified momentum and mass conservation equations are applied separately. A more comprehensive injector model which considers the two loss factors at the needle seat and holes, sac volume, and viscous drag and leakage has been developed. The calculation methods for wave disturbances and losses have been reviewed and improved methods are presented.
Rate modulation devices are becoming more popular as their potential is realised for reducing noise and emissions of unburned hydrocarbons and oxides of nitrogen. The split injection device, two-spring injector, and shuttle pilot service are described and modelled.
The model has been validated with an over-the-nose pump, which was chosen to be one of the most difficult FIE specifications to model. The pump suffers from incidental pilot injection due to high amplitude of pressure waves in the pipe which is caused in turn by a high initial cam rate. Cavitation occurs in almost all operating conditions, and parametric losses occur in the volumes in the pump. Three different specifications have been chosen to validate the model. The model predictions are in accord with experimental results in all three cases.(DX182202)
University of Southampton
1994
Lee, Hang-Kyung
(1994)
Modelling rotary diesel fuel injection equipment with rate control to reduce noise and emissions.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Stringent legislation on vehicle noise and pollutant emissions has created increasingly severe demands on the fuel injection equipment fitted to automotive diesel engines. In particular, the use of high pressure across smaller nozzle holes to reduce particulate emissions has increased the effect of nonlinear compression of the fuel in the passages and volumes in the systems. Fuel cavitation has been increased by more vigorous wave action.
Both of these nonlinear effects have been investigated and modelled by replacing the pressure with condensation, which is continuous across the fuel phase boundary. The nonlinearity in compression has been incorporated into the wave equations by using a nonlinear equation of state where the bulk modulus is assumed to change linearly with pressure. The cavitated pipe section is divided into liquid and mixture columns and modified momentum and mass conservation equations are applied separately. A more comprehensive injector model which considers the two loss factors at the needle seat and holes, sac volume, and viscous drag and leakage has been developed. The calculation methods for wave disturbances and losses have been reviewed and improved methods are presented.
Rate modulation devices are becoming more popular as their potential is realised for reducing noise and emissions of unburned hydrocarbons and oxides of nitrogen. The split injection device, two-spring injector, and shuttle pilot service are described and modelled.
The model has been validated with an over-the-nose pump, which was chosen to be one of the most difficult FIE specifications to model. The pump suffers from incidental pilot injection due to high amplitude of pressure waves in the pipe which is caused in turn by a high initial cam rate. Cavitation occurs in almost all operating conditions, and parametric losses occur in the volumes in the pump. Three different specifications have been chosen to validate the model. The model predictions are in accord with experimental results in all three cases.(DX182202)
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Published date: 1994
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Local EPrints ID: 462845
URI: http://eprints.soton.ac.uk/id/eprint/462845
PURE UUID: 0c8a2ee1-db0b-4aad-8615-56563e12282a
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Date deposited: 04 Jul 2022 20:14
Last modified: 04 Jul 2022 20:14
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Author:
Hang-Kyung Lee
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