Wyniki wyszukiwania - BazTech

1

The use of laser equipment to optimize the operating parameters of the fuel injector of combustion engine

Kowalski M., Jankowski A.

Journal of KONES

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2018

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Vol. 25, No. 4

199--206

EN

The conducted tests were aimed at determination of the drop diameters and shaping of the velocity field at different configurations of the test injector. The test results allowed defining the relationship between the injector configuration and the distribution of velocities and dimensions of drops in the fuel stream. The effect of the fuel viscosity and injection pressure on the dimensions of fuel drop diameters and the distribution of the velocity field of drops in the stream were tested. The tests were carried out on a special test rig with a fixed volume chamber. The measurements were carried out with the use of laser Doppler measurement systems (PDPA, LDV). The tests were conducted for seven different fuel types varying in viscosity and surface tension. In addition, the injection pressure from 50 MPa to 130 MPa was applied. The test results allowed determining the relationship between the injector structure configuration, fuel types and fuel additives, and the distribution of velocity and an atomisation spectrum of drops in the fuel stream, and the air impact on the fuel stream.

2

Preliminary Researches Of Influence Of Different Loads On Working Conditions And Performances Of The Piston Combustion Engine With Direct Fuel Injection

Jankowska-Siemińska B., Jankowski A., Slezak M.

Journal of Polish CIMAC

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2007

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Vol. 2, no 2

187-198

EN

The most of research works with reference to piston engines with the direct fuel injection concentrate on two basic systems . One system is a homogeneous system and refers to high engine loads both from the point of view of torque and rotational engine speed. The second system refers to small loads and rotational engine speeds which usually do not exceed 50 % of the maximum allowable loads and the rotational speed. These systems were an object of the analysis and research with use of the laser-equipment , mostly the PDPA and LDV. For the comparison only the PIV research were brought over. In brought over analysis one returned the special attention on stratified combustion, homogeneous combustion, water injection and water fuel emulsions, heat exchange. In particular research injectors, the combustion space of the constant of the volume with 3D laser equipment (PDPA, LDV), results of researches of fuel spray concerning droplet diameters, results of researches of fuel spray concerning droplet distribution of lineal and volume, and dependences Rosin-Rammler, results of researches of fuel spray concerning distribution of 3D droplet velocity, results of the analysis of combustion rate and impulse for fuel spray are presented in the paper. The obtainment of small droplet dimensions is possible in the way increasing of the injection pressure. However high increasing of the pressure unfavourably bears on life of fuel equipment. From other methods one can mention methods mechanical improvements of spraying of the fuel. One of mechanical methods stayed put-upon in research of the ignition process.

3

The identification method of airflow character in combustion engines

Kolanek Cz., Tkaczyk M.

Journal of KONES

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2006

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Vol. 13, No. 3

131-137

EN

This work contains description about place to determine: not invasive methods distribution velocity of air in combustion engines cylinder, invasive methods define velocity flow of air in inlet track. Moreover contain progress measurements about description in used laser- end thermoanemometry. Determined values was created witch the aid of algorithm weight rests, worked out and graphic presented. The last part contains identification of flow character on the basis of findings. The schema of the measuring-stand, the schema of the laser- measuring-system, plots velocity components are presented in the paper. Research showed that at given parameters eddying perimetric round the axis of the cylinder did not occur. In points being found nearest the plate of the valve smallest values absolute velocity were registered. Shape of the intake air channel introducing perimetric eddy in the cylinder of the engine, causes the course extension of the flow and introduces changes surfaces of the cross-section canal. An effect compound geometry is increasing of the flow velocity, and what to these is going the height resistance forces of the flow.

PL

Praca zawiera opis stanowiska do wyznaczania: rozkładu prędkości powietrza w cylindrze silnika spalinowego metodami bezinwazyjnymi, określania prędkości przepływu powietrza przez układ dolotowy metodą inwazyjną. Ponadto umieszczono opis przebiegu pomiarów z wykorzystaniem anemometru laserowego i termoanemometru. Wyznaczone wartości zostały przetworzone za pomocą algorytmu reszty ważonej, opracowane i przedstawione w formie wykresów. Ostatnia CZĘŚĆ pracy zawiera identyfikację charakteru przepływu na podstawie uzyskanych wyników.