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Архивы рубрики: Fuel Systems for IC Engines

Instrument for the test of the injectors based on the measuring of spray momentum

A Mariani 1, L Postrioti 2, C Ungaro 1 1 Loccioni Mobility R&D, Italy 2 University of Perugia, Italy ABSTRACT In the first part of the present paper the result of an experimental analysis of common rail high pressure Diesel spray evolving in high counter pressure conditions is reported. The global spray momentum and momentum

APPLICATIONS FOR COMMON RAIL INJECTORS

In the following applications the presented HDA measurement principle will be compared with the already known EMI measurement principle. Both measurement technologies were set-up and tested alternately on a known and in practice commonly realised test bench for functional testing of common rail injectors. Figure 4 Shows schematically the structure of the used test bench

LATEST DESIGNS OF INJECTION MEASUREMENT TECHNOLOGIES

In the development and testing departments of common rail injectors the injection quantity indicators (EMI) have been proved successfully for quantity measurements with a very high accuracy. Figure 2 shows schematically the principle of the EMI based on a moving piston and the latest design version, the EMI21. The injected quantity of calibration fluid can

DEMANDS ON THE INJECTION MEASUREMENT TECHNOLOGY FROM MODERN FUEL INJECTION SYSTEMS

Modern common-rail fuel injection systems in diesel engines for PC (passenger cars) and CV (commercial vehicles), see [4,5], have to fulfil increased requirements regarding dynamics and accuracy of the fuel metering into the combustion chamber together with increased injection pressure up to far more than 2000 bar. This offers a prerequisite for the development of

Innovative Measurement technologies for fuel injection systems

C Majer, B Janetzky, R Dцll Robert Bosch GmbH — Diesel Systems (DS) Department of Engineering Measurement Technology (DS/EMT), Germany ABSTRACT This paper introduces a new measuring method to determine the injection quantity and the injection rate. The method uses measurements which indicate the pressure increase inside a hydraulic chamber during the injection. Also the

Integration of the Injector in the Virtual Combustion Chamber

As described, Eulerian multiphase flow is the method of choice to capture flow behaviour inside the injector. However, to reduce overall computational time, traditionally introduction of the fuel droplets in the combustion chamber, fuel droplets evaporation, air/fuel mixture formation and combustion phenomena are preferably captured in single phase Lagrangian flow domain. The AVL’s engine CFD

INJECTOR PERFROMANCE AND CALIBRATION ANALSYS CFD Deliverables of Injector Integration Analysis

While section 2 of this work describes how CFD technology could support injector design engineers to optimize the actual injector geometries. In the following Section, we will demonstrate how engineering teams utilize simulation to virtually analyse the performance of the virtual injector in the virtual engine. The methodology could be leveraged for the injector design

Injector Performance and Durability Analysis

In the following session we describe the application aspect of the virtual design evaluation of high pressure fuel injectors based on the work of Greif & Srinivasan [1] . The focus is not only on the discharge rate and atomization performance of the injector, but also on the prediction of the erosion level and spatial

Numerical Framework of Applied CFD Method

AVL CFD methodology considers each fluid as a continuum media and applies the conservation laws. An ensemble averaging is affected to remove the microscopic interfaces, resulting in macroscopic conservation equations which are analogous to their single-phase counterparts but differ in that a new variable called volume fraction, and new terms referred to as the interfacial

VIRTUAL INJECTIOR SYSTEM DESIGN DEVELOPMENT CFD Deliverables of Injector Design Analysis

Eulerian multiphase CFD concept is the key technology deployed to predict cavitation phenomena as a function of not only geometrical but also operational conditions of the diesel injector. Deliverables of CFD simulation analysis performed by AVL’s engine CFD method are the volume fraction of vaporized fuel as a result of cavitation, the time-based [ms] or