The interaction between impacting and splashed droplets on the combustion chamber walls and inlet air motion plays a fundamental role in the mixture formation process. It covers a crucial aspect for the correct operation of both DI diesel and gasoline engines as it greatly influences the combustion process and the exhaust emissions. A complete understanding of spray impingement is quite complex. In this paper, a numerical-experimental approach is proposed. On the experimental side, the behaviour of a Diesel impinging spray emerging from a common rail injection system (injection pressures of 80 MPa and 120 MPa) and of a gasoline hollow cone spray generated by a swirled injector (injection pressures up to 10.0 MPa) have been analysed. The impinging spray has been lightened by a pulsed laser sheet generated from the second harmonic of a Nd - YAG laser. The images have been acquired by a CCD camera at different times from the Start of Injection. Digital image processing software has enabled to extract the characteristic parameters of the impinging spray with respect to different operating conditions. The numerical analysis is carried out by means of a multi-dimensional numerical tool, based on the KIVA-3V code. The spray-wall interaction is simulated through a properly modified phenomenological splash model available in literature. Based on the experimental evidences, the proposed modified version of the model is proven to be an adequate representation for different injection pressures and back-pressures

Andreassi, L., L:, U., S, ., Allocca, L., Rocco, V. (2008). A general splash model for direct injection engine multidimensional simulation. In SAE Technical papers 2007-24-0022. SAE [10.4271/2007-24-0022].

A general splash model for direct injection engine multidimensional simulation

ANDREASSI, LUCA;ROCCO, VITTORIO
2008

Abstract

The interaction between impacting and splashed droplets on the combustion chamber walls and inlet air motion plays a fundamental role in the mixture formation process. It covers a crucial aspect for the correct operation of both DI diesel and gasoline engines as it greatly influences the combustion process and the exhaust emissions. A complete understanding of spray impingement is quite complex. In this paper, a numerical-experimental approach is proposed. On the experimental side, the behaviour of a Diesel impinging spray emerging from a common rail injection system (injection pressures of 80 MPa and 120 MPa) and of a gasoline hollow cone spray generated by a swirled injector (injection pressures up to 10.0 MPa) have been analysed. The impinging spray has been lightened by a pulsed laser sheet generated from the second harmonic of a Nd - YAG laser. The images have been acquired by a CCD camera at different times from the Start of Injection. Digital image processing software has enabled to extract the characteristic parameters of the impinging spray with respect to different operating conditions. The numerical analysis is carried out by means of a multi-dimensional numerical tool, based on the KIVA-3V code. The spray-wall interaction is simulated through a properly modified phenomenological splash model available in literature. Based on the experimental evidences, the proposed modified version of the model is proven to be an adequate representation for different injection pressures and back-pressures
ICE 2007 8th International conference on Engines for Automobile
Rilevanza internazionale
Settore ING-IND/08 - Macchine a Fluido
English
Intervento a convegno
Andreassi, L., L:, U., S, ., Allocca, L., Rocco, V. (2008). A general splash model for direct injection engine multidimensional simulation. In SAE Technical papers 2007-24-0022. SAE [10.4271/2007-24-0022].
Andreassi, L; L:, U; S, ; Allocca, L; Rocco, V
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/52048
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