A Holistic Hydraulic and Spray Model Liquid and Vapor Phase Penetration of Fuel Sprays in DI Diesel Engines DaimlerChrysler AG

Format:

Conference/Event

Author/Creator:

Schmalzing, C.O., author.

Conference Name:

International Fuels and Lubricants Meeting and Exposition (1999-10-25 : Toronto, Canada)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1999

Summary:

For studying the effects of injection system properties and combustion chamber conditions on the penetration lengths of both the liquid and the vapor phase of fuel injectors in Diesel engines, a holistic injection model was developed, combining hydraulic and spray modeling into one integrated simulation tool.The hydraulic system is modeled by using ISIS (Interactive Simulation of Interdisciplinary Systems), a one dimensional inhouse code simulating the fuel flow through hydraulic systems. The computed outflow conditions at the nozzle exit, e.g. the dynamic flow rate and the corresponding fuel pressure, are used to link the hydraulic model to a quasidimensional spray model. The quasidimensional spray model uses semiempirical 1D correlation functions to calculate spray angle, droplet history and droplet motion as well as penetration lengths of the liquid and the vapor phases. For incorporating droplet vaporization, a single droplet approach has been used. In the paper the details of the modeling approaches are discussed and simulation results for conditions typical for HD DI Diesel engines are presented.The model results are compared to experimental results obtained from measuring liquid and vapor penetration of fuel sprays of a research type CR injector in a high pressure, high temperature combustion bomb. The data obtained by simultaneously applying Schlieren and MieScattering diagnostics are in very good agreement with the data predicted by the holistic injection model. It is concluded therefore that the proposed model is a suitable tool for supporting R&D efforts to optimize DI diesel sprays for future engines

Notes:

Vendor supplied data

Publisher Number:

1999-01-3549

Access Restriction:

Restricted for use by site license