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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

2007

Vol. 2, no 2

187-198

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.

Measurement of drop size distribution in fuel sprays by laser methods

Jankowski A., Sandel A., Jankowska-Siemińska B., Sęczyk J.

Journal of KONES

2001

Vol. 8, No. 3-4

334-345

Results of atomized fuel spray parameters measurement are presented in this paper, for an injector applied in common rail systems of CI engines as well as for an air-assist type petrol atomizer compared with a conventional petrol one. The measurements were carried out with the use of a dynamic, laser Doppler particle size and velocity analyzer (LDV and PDPA). It is shown that the both injection systems examined are capable of producing very fine atomization. The measuring set-up and equipment are described.