scholarly journals INFLUENCE OF THE METERING METHOD ON THE CHARACTERISTICS OF A DIESEL DISTRIBUTOR FUEL PUMP

2018 ◽  
Vol 45 (2) ◽  
pp. 52-61
Author(s):  
К. M. Godzhaev
Keyword(s):  
Differential Equations ◽  
Diesel Engines ◽  
Fuel Injection ◽  
Injection Pressure ◽  
Supply System ◽  
Two Phase ◽  
Fuel Pump ◽  
Fuel Supply ◽  
Injection Process ◽  
Fuel Supply System

Objectives The aim of the study is to improve the performance of the metering system and thus enhance control over the cyclical supply of fuel to a diesel distributor pump. The results of a study of the effect of a new metering method on the characteristics of a distributor fuel pump are presented. Methods Following mathematical analysis, a mathematical model of the working process of the fuel supply system, based on a new metering approach employing the "decay of discontinuity" method, was compiled.The model comprises a system of differential equations for continuity and momentum alongside mass balance equations for describing the boundary conditions for various cavities of the fuel system, i.e. above the plunger, under the valve, above the valve cavities and in the nozzle. The differential equations take into account the two-phase nature of the gas-liquid medium in the injection cavities and metering system, as well as the design features of the pump. An expression for the stroke of the metering plunger in the new system is given. Results The theoretical and experimental characteristics of a fuel supply system employing the proposed metering system are considered. Diagrams showing maximum injection pressures, which depend on the stroke of the metering plunger at various strokes of the injection plunger and alteration of maximum injection pressure of the nozzle depending on the rotation speed of the cam shaft, are provided. The characteristics of the fuel supply system of the pump for various spring stiffness of the metering plunger are also provided in diagram form. The comparative parameters of the fuel supply process are presented for the conventional and new metering methods. The features of the use of diesel high-pressure distributor pumps, their design and operational features are described. The advantages of the metering system proposed by the author are presented in terms of its influence on the fuel injection process. A comparative evaluation of metering methods used in contemporary distributor pumps for diesel engines is given. Conclusion The results of the experiments confirmed the suitability of the new metering method for use in diesel engines.

scholarly journals Stage 3a environmental compliance of the 6-cylinder tractor engine

2021 ◽  
pp. 188
Author(s):  
Heorhi Kukharonak ◽  
Alexander Petruchenko ◽  
Andrei Predko ◽  
Dmitry Telyuk
Keyword(s):  
Combustion Chamber ◽  
Diesel Engines ◽  
Injection Pressure ◽  
Supply System ◽  
Exhaust Gas ◽  
Environmental Compliance ◽  
Fuel Supply ◽  
Fuel Supply System ◽  
The Cost ◽  
Gas Recirculation

The development strategy of the Minsk Motor Plant, implemented within the framework of plant and state scientific and technical programs, is aimed at producing competitive products that meet modern technical requirements of international standards and quality. The mandatory requirement for the successful promotion of diesel engines on the off-road vehicle market is to ensure the required environmental performance, with low fuel consumption and low engine cost. The well-known technical solutions aimed to achieve environmental indicators of the Stage 3A level significantly increase the cost of diesel engines, therefore, the achievement of the required environmental standards without a significant increase in the cost of engines can be considered an urgent task. Purpose. Stage3A Environmental Compliance for 6 Cylinder Tractor Diesel. Methodology. Experimental studies were carried out for diesel engines equipped with: a Common Rail BOSCH accumulator fuel supply system with an injection pressure of 140 MPa, injectors with 7 nozzle holes; a direct-action fuel supply system with a MOTORPAL fuel pump providing a maximum injection pressure of 100 MPa, MOTORPAL injectors and AZPI with five nozzle holes; combustion chambers of two types with bowl diameters of 55 and 67.5 mm; cylinder heads providing swirl ratios 3–4 and 3.5–4.5; high pressure exhaust gas recirculation system. The tests were carried out at characteristic points of the NRSC cycle at three crankshaft speeds: minimum idle speed 800 min-1, maximum torque 1600 min-1, and maximum power 2100 min-1. Results. It turned out that it is possible to achieve Stage3A emissions standards on 116 kW diesel engines using direct fuel equipment and a semi-open combustion chamber, on 156 kW diesel engines using a Low Cost Common Rail fuel supply system and an open combustion chamber. Originality. The results of the combustion chamber shape choice, the parameters of the fuel-injection equipment, the swirl ratio of the inlet channels, valve timings and parameters of the exhaust gas recirculation system made it possible to organize diesel engine workflow of the Stage 3A ecological level. Practical significance. Construction elements of the six-cylinder diesel engines have been developed and introduced at the Minsk Motor Plant.

Experimental Stand to Investigate the Injection Process in Diesel Engines

2021 ◽  
Vol 42 ◽  
pp. 79-84
Author(s):  
Dragoș Tutunea ◽  
Ilie Dumitru ◽  
Laurenţiu Racilă
Keyword(s):  
Diesel Engines ◽  
Electric Motor ◽  
High Performance ◽  
Fuel Injection ◽  
Combustion Process ◽  
Injection Pressure ◽  
Injection System ◽  
Injection Process ◽  
Experimental Stand ◽  
Fuel Injection Pressure

The objective of this paper is to investigate the fuel injection system in diesel engines by using inline pumps. In a diesel engines, the fuel injection pressure plays an important role in the combustion process in order to obtain high performance and low fuel consumption. The experiments in this paper are been performed on a 6 cylinder inline pump which is actioned by an electric motor with variable r.p.m.-s The quantity of the fuel injected by each injector is measured function of time and the speed of electric motor. The experiments show the degree of non-uniformity of the fuel delivered by the pump to injectors.

DIESEL MIXED FUEL: PROBLEMS AND INNOVATIVE INVENTIONS

2016 ◽  
Vol 1 (2) ◽  
pp. 46-51 ◽  
Author(s):  
Уханов ◽  
Denis Ukhanov ◽  
Уханов ◽  
Aleksandr Ukhanov ◽  
Адгамов ◽  
...  
Keyword(s):  
Vegetable Oil ◽  
Diesel Fuel ◽  
Diesel Engines ◽  
Supply System ◽  
Dual Fuel ◽  
Original Design ◽  
Mixed Fuel ◽  
Fuel Supply ◽  
Biodiesel Blend ◽  
Fuel Supply System

The goal of the research is constructive adaptation of automotive diesel engines working by diesel mixed fuel. A perspective kind of an alternative motor fuel is biodiesel blend produced with mixing of vegetable oil and conventional diesel fuel in different percentages. The present diesel-powered machinery is not adapted to work on such kind of fuel because of the different properties of biodiesel and diesel fuels. Applying of the invented devices (such as dual-fuel supply system, the mixer-filter and ultrasonic fuel mixer) allows to adapt automotive diesel engines for work on biodiesel blend. The dual-fuel supply system performs engine start, warm-up and stop modes on mineral diesel fuel, and its work on biodiesel blend on other modes. The original design of the fuel mixer-filter provides effective mixing of components and filtration from contaminants. Due to the high frequency vibrations the ultrasonic mixer provides the obtaining of homogeneous fuel composition and molecular splitting of higher fatty acids contained in vegetable oil.

INVESTIGATION OF OPERATIONAL RELIABILITY OF DIESEL ENGINE FUEL SUPPLY SYSTEMS

2021 ◽  
Vol 74 (3) ◽  
pp. 9-16
Author(s):  
YU.V. BAZHENOV ◽  
◽  
M.YU. BAZHENOV ◽  
V.P. KALENOV ◽  
◽  
...  
Keyword(s):  
Experimental Data ◽  
Diesel Engine ◽  
Diesel Engines ◽  
Operational Reliability ◽  
Supply System ◽  
Engine Fuel ◽  
Fuel Supply ◽  
Fuel Supply System ◽  
Supply Systems

The results of the investigation of operational reliability of the fuel supply system of diesel engines F1A FIAT DUCATO cars, the main reasons for the system's loss of operability, the numeri-cal characteristics of its failure-free performance are given. On the basis of processing the array of experimental data on faults and failures in the system, the regularities of change of failure intensi-ty and probabilities of failure-free operation of its main parts depending on vehicle mileage are determined. Methods and algorithm of troubleshooting and timely elimination of damages occur-ring in the fuel supply system are proposed and tested at the FIAT PROFESSIONAL dealership in Vladimir. The introduction of the results of the performed investigations into the production pro-cesses of car service enterprises allows to significantly reduce the costs of maintaining the opera-ble state of the diesel engine fuel supply system in operation.

scholarly journals MODERNIZATION OF THE DESIGN OF THE MIXING AND FUEL SUPPLY SYSTEM FOR TRACTOR DIESELS FOR BIOFUEL OPERATION

2020 ◽  
pp. 135-147
Author(s):  
Victor Anisimov ◽  
Vadym Ryaboshapka ◽  
Anatoliy Yelenych
Keyword(s):  
Diesel Engine ◽  
Diesel Fuel ◽  
Diesel Engines ◽  
Combustion Process ◽  
Vortex Chamber ◽  
Supply System ◽  
High Quality ◽  
Fuel Supply ◽  
Short Period ◽  
Fuel Supply System

In diesel engines, the combustion process takes place over a very short period of time (0.001 s). As a result, complete and timely combustion of fuel and good use of the air available in the engine cylinders can be achieved only with very high-quality mixing. The use of biofuels in modern diesel engines causes a number of problems associated with changes in the parameters of fuel supply and mixing. All types of fuel have different characteristics: density, viscosity, lubricating properties, self-ignition temperature, compressibility and. in this regard, the laws of fuel supply: spraying, combustion, will be different. The viscosity of biofuels is higher than that of diesel fuel. For this reason, its capacity through small holes in the nozzle of the nozzle (dh= 0.25...0.40 mm) lower than diesel fuel. Due to the small diameter of the holes in the nozzle nozzles and the increased viscosity of biofuels, the nozzle holes are quickly coked. At the same time, the shape and direction of the jet initially changes, and then the hole is completely coked and the fuel supply stops. Thus, for high-quality operation of the diesel engine on biofuels, it is necessary to modernize the design of the mixing and fuel supply system. This problem can be solved by using systems with separate combustion chambers, i.e. using vortex chamber mixing. In the vortex chamber, 60-80% of the fuel burns, the pressure increases and the burning torches of the fuel flow at high speed into the main over-piston plane of the combustion chamber, where there is a significant supply of air that is not used during the combustion of the charge in this chamber. At the same time, oxygen from the air is well used, and the operation of the diesel engine becomes more efficient at relatively low values of the excess air coefficient at the nominal mode and less toxicity of exhaust gases than for single-chamber diesels.

Research Status and Development Trend of Dimethyl Ether Fuel Supply System

2014 ◽  
Vol 940 ◽  
pp. 167-172
Author(s):  
Jing Sun ◽  
Guang De Zhang ◽  
Cai Xia You ◽  
Qiang Yao ◽  
Zhong Hai Hou
Keyword(s):  
Dimethyl Ether ◽  
Fuel Injection ◽  
Development Trend ◽  
Supply System ◽  
Injection System ◽  
Engine Fuel ◽  
Fuel Supply ◽  
Low Viscosity ◽  
Fuel Delivery ◽  
Fuel Supply System

A survey of study on dimethyl ether engine fuel supply system at home and abroad was described, including pump-pipe-nozzle system and common-rail fuel supply system. The main trouble of practical application of dimethyl ether engine is wear and leakage problems in the fuel delivery system caused by low viscosity of dimethyl ether. For controllable premixed combustion of dimethyl ether engine, a fuel injection system is developed which is consisted of a diaphragm pump and a wear self-compensation nozzle or an independent lubrication nozzle. The system is expected to solve the above problems essentially and becomes a development direction for the future.

scholarly journals Optimization of Fuel Injection Parameters of Moringa oleifera Biodiesel-Diesel Blend for Engine-Out-Responses Improvements

Symmetry ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 982
Author(s):  
Yew Heng Teoh ◽  
Heoy Geok How ◽  
Farooq Sher ◽  
Thanh Danh Le ◽  
Hwai Chyuan Ong ◽  
...  
Keyword(s):  
Diesel Engines ◽  
Fossil Fuels ◽  
Moringa Oleifera ◽  
Fuel Injection ◽  
Injection Pressure ◽  
Single Step ◽  
Rapid Decline ◽  
Fuel Blend ◽  
Combustion Dynamics ◽  
Rsm Optimization

Biodiesel has gained popularity in diesel engines as a result of the rapid decline of fossil fuels and population growth. The processing of biodiesel from non-edible Moringa Oleifera was investigated using a single-step transesterification technique. Both fuels had their key physicochemical properties measured and investigated. In a common-rail diesel engine, the effects of MB50 fuel blend on the symmetric characteristics of engine-out responses were evaluated under five load settings and at 1000 rpm. As compared to standard diesel, MB50 increased brake thermal efficiency (BTE), and nitrogen oxides (NOx) emissions while lowering brake specific fuel consumption (BSFC), and smoke emissions for all engine loads. A further study of injection pressure and start of injection (SOI) timing for MB50 fuel was optimized using response surface methodology (RSM). The RSM optimization resulted in improved combustion dynamics due to symmetry operating parameters, resulting in a simultaneous decrease in NOx and smoke emissions without sacrificing BTE. RSM is an efficient optimization method for achieving optimal fuel injection parameter settings, as can be deduced. As a result, a clearer understanding of the use of MB50 fuel in diesel engines can be given, allowing for the best possible engine efficiency.

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