scholarly journals Simulation studies of selected characteristics of the injection system the common rail medium-speed research engine

2012 ◽  
Vol 151 (4) ◽  
pp. 72-76
Author(s):  
Leszek PIASECZNY ◽  
Mirosław WALKOWSKI
Keyword(s):  
Common Rail ◽  
Injection System ◽  
Graphical Form ◽  
Engine Operation ◽  
Fuel Supply ◽  
Injection Process ◽  
Medium Speed ◽  
Marine Engines ◽  
Medium Speed Engine ◽  
Marine Medium

Injection Systems of Common Rail type are becoming widely used in marine engines. The aim of the research and development of these systems is to optimize the multi-injection process. The authors of the paper present the results of research on the fuel supply system of research common-rail marine medium-speed engine. The study was conducted for the nominal circulation engine speed. For the analysis were established three variants of fuel supply – a single dose, two-piece and three-piece The interdependence of measured injection parameters and their effect on engine operation have been presented in graphical form.

scholarly journals Research the Possibility of Obtaining Diagnostic Information about the Ships Engine Fuel Injection System Condition based on the Analysis of Characteristics of Heat Release

2019 ◽  
Vol 26 (3) ◽  
pp. 249-256
Author(s):  
Kazimierz Witkowski
Keyword(s):  
Heat Release ◽  
Fuel Injection ◽  
Injection System ◽  
Engine Fuel ◽  
Medium Speed ◽  
Marine Engines ◽  
Marine Diesel ◽  
Medium Speed Engine ◽  
Marine Medium ◽  
Speed Engine

Abstract Marine engines are very complex technical objects, having many important functional systems, which include, inter alia, injection system, characterized by high unreliability. In this system, there may be different types of defects (damage) that affect the engine parameters, including specific fuel consumption, as well as failures endanger the safety of the ship. The indicator diagrams and analysis of indicated parameters have limited utility in the diagnosis of damages of marine engine, although this is a method commonly used in operational practice. To achieve greater diagnostic effectiveness, when, based on indicator diagrams, are calculated and then the characteristics of heat release is analysed - net of heat release characteristics and the intensity of the heat release, it was demonstrated. This procedure is particularly effective in the diagnosis of damages of marine diesel engine injection system components. It has been shown that the characteristics of heat release contain information about the condition of the injection systems, which enable to diagnose their failures. This is shown on the example of a clogged nozzle holes (their carbonizations). The obtained results allowed selecting the diagnosis symptoms, useful in detecting these faults in the injection system, from the characteristics of heat release: net heat release (Q) and intensity of heat release (q). The object of the research was typical marine medium speed engine Sulzer A25/30.

scholarly journals Effect of the In-Cylinder Back Pressure on the Injection Process and Fuel Flow Characteristics in a Common-Rail Diesel Injector Using GTL Fuel

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 452
Author(s):  
Luka Lešnik ◽  
Breda Kegl ◽  
Eloísa Torres-Jiménez ◽  
Fernando Cruz-Peragón ◽  
Carmen Mata ◽  
...  
Keyword(s):  
Diesel Fuel ◽  
Back Pressure ◽  
Common Rail ◽  
Fuel Properties ◽  
Injection System ◽  
Nozzle Flow ◽  
Average Mass ◽  
Injection Process ◽  
Fuel Flow ◽  
Computational Program

The presented paper aims to study the influence of mineral diesel fuel and synthetic Gas-To-Liquid fuel (GTL) on the injection process, fuel flow conditions, and cavitation formation in a modern common-rail injector. First, the influence on injection characteristics was studied experimentally using an injection system test bench, and numerically using the one-dimensional computational program. Afterward, the influence of fuel properties on internal fuel flow was studied numerically using a computational program. The flow inside the injector was considered as multiphase flow and was calculated through unsteady Computational Fluid Dynamics simulations using a Eulerian–Eulerian two-fluid approach. Finally, the influence of in-cylinder back pressure on the internal nozzle flow was studied at three distinctive back pressures. The obtained numerical results for injection characteristics show good agreement with the experimental ones. The results of 3D simulations indicate that differences in fuel properties influence internal fuel flow and cavitation inception. The location of cavitation formation is the same for both fuels. The cavitation formation is triggered regardless of fuel properties. The size of the cavitation area is influenced by fuel properties and also from in-cylinder back pressure. Higher values of back pressure induce smaller areas of cavitation and vice versa. Comparing the conditions at injection hole exit, diesel fuel proved slightly higher average mass flow rate and velocities, which can be attributed to differences in fluid densities and viscosities. Overall, the obtained results indicate that when considering the injection process and internal nozzle flow, GTL fuel can be used in common-rail injection systems with solenoid injectors.

Influence of deforming of common rail diesel injectors parts on the fuel injection process

2021 ◽  
pp. 4-12
Author(s):  
Keyword(s):  
High Pressures ◽  
Fuel Injection ◽  
Experimental Studies ◽  
Common Rail ◽  
Electronic Control ◽  
Fuel System ◽  
Fuel Supply ◽  
Injection Process ◽  
Injection Cycle

Experimental studies have revealed a significant impact of deformation of Сommon Rail injector parts on the fuel supply process. High pressures alter the structure of the fuel supply cy-cle. Theforward front of the fuel supply cycle begins with the stage of unloading the deformed parts of the injector. The rear front of the fuel supply cycle ends with the stage of deformation of the injector parts. The calculated and experimental determination of cyclic fuel supply gave similar results. The developed method of determining the duration of the injection cycle stages creates a basis for experimental verification of mathematical models. Keywords: injector, Common Rail, diesel, fuel system, electronic control, needle, fuel injection

A High-Speed Direct Injection Diesel Engine for Passenger Cars

1988 ◽  
Vol 202 (3) ◽  
pp. 171-181 ◽  
Author(s):  
J A Stephenson ◽  
B A Hood
Keyword(s):  
Diesel Engine ◽  
High Speed ◽  
Fuel Injection ◽  
Direct Injection ◽  
Injection System ◽  
Passenger Cars ◽  
Medium Speed ◽  
Medium Speed Engine ◽  
Hsdi Diesel Engine ◽  
Wide Speed Range

The paper describes the development of a high-speed direct injection (HSDI) diesel engine suitable for passenger car applications. The evolution from a low emissions medium-speed engine, through a four-cylinder 2.3 litre research engine, into a four-cylinder 2.0 litre production engine is presented. The challenge to the engineer has been to develop the HSDI engine to operate with acceptable noise, emissions, smoke and driveability over the wide speed range (up to 5000 r/min) required for passenger cars. The key element in this task was the optimization of the combustion system and fuel injection equipment. The HSDI is shown to have a significant fuel economy advantage over the prechamber indirect injection (IDI) engine. Future developments of the fuel injection system are described which will further enhance the HSDI engine and provide additional noise and emissions control.

Research on Low-Pressure Common Rail Electrical Control Injection System of Dimethyl Ether Engine

2011 ◽  
Vol 228-229 ◽  
pp. 702-707 ◽  
Author(s):  
Jun Tao ◽  
Guang De Zhang
Keyword(s):  
Real Time ◽  
Test Bench ◽  
Saturated Vapor ◽  
Low Pressure ◽  
Test System ◽  
Common Rail ◽  
Injection System ◽  
Signal Acquisition ◽  
Engine Operation ◽  
Electrical Control

According to such properties of DME as high saturated vapor pressure, low viscosity and easy formation of mixture with air, a CPC (Controllable Premix Combustion) low-pressure common rail electrical control fuel injection test bench of DME engine is developed through this research. In addition, an overall design of the test system, hardware and software development of electrical control unit (ECU) and a test on the test bench are undertaken. The software of ECU is programmed by using real time modular programming. It has the advantages of flexible programming, convenient transplantation and wide extending possibility. Test results show that the injector switch timely, spray powerfully and pulverize perfectly. The software accomplishes many tasks such as signal acquisition as well as real-time control requirement of engine operation. Test result also shows the feasibility and good comprehensive performance of low-pressure common rail electronic system for DME fuel.

scholarly journals Analysing Applicability Of Selected Methods To Smooth Indicator Diagrams Of Marine Medium-Speed Engine

2015 ◽  
Vol 22 (2) ◽  
pp. 55-61 ◽  
Author(s):  
Rafał Pawletko
Keyword(s):  
Moving Average ◽  
Diagnostic Information ◽  
Pressure Curve ◽  
Filtration Method ◽  
Smoothing Methods ◽  
Medium Speed ◽  
Curve Smoothing ◽  
Medium Speed Engine ◽  
Marine Medium ◽  
Speed Engine

Abstract The article analyses the applicability of selected smoothing methods to smooth indicator diagram curves and to filter disturbances. An intermediate goal of the study was an attempt to extract disturbances recorded during pressure curve smoothing, which are believed to be a source of important diagnostic information. Within the framework of the reported analysis, a comparison was made between the moving average method, the Savitzky-Golay filter, and the frequency filtration method. The research was performed on a marine medium-speed engine Sulzer 3Al 25/30, which has a relatively long indicator passage.

scholarly journals Influence of the Fuel Properties on the Injection Process and Spray Development in a large ship diesel Engine

2017 ◽  
Author(s):  
Ibrahim Najar ◽  
Bert Buchholz ◽  
Benjamin Stengel ◽  
Christian Fink ◽  
Egon Hassel
Keyword(s):  
Diesel Engine ◽  
Cone Angle ◽  
Fuel Properties ◽  
Fuel Oil ◽  
Injection System ◽  
Heavy Fuel Oil ◽  
Common Rail Injection System ◽  
Injection Process ◽  
Medium Speed ◽  
Common Rail Injection

The present paper deals with the influence of fuel properties on the spray behaviour. This influence was studiedexperimentally using a common rail injection system from a medium speed diesel engine. The experiments have been performed with diesel fuel (EN-590) and heavy fuel oil (RMG 180) on a constant volume chamber at room temperature. Comparison of the spray characteristics shows that the heavy fuel oil penetrates deeper in the chamber. However, the diesel spray has a bigger cone angle. These results formed the basis for a further development of the 1D-model [1] to predict the spray penetration by considering the fuel properties and temperature.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4787

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