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Study of the influence of different factors on combustion processes (Part two)

Jankowski A.

Journal of KONES

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2009

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Vol. 16, No. 3

135-140

EN

The gas-phase occurs in homogeneous or heterogeneous form. In thefirst case the kinetics of chemical reactions controls processes of the combustion, in second, heterogeneous one - processes to run most slow down. For liquid fuels, decomposition processes of the liquid phase occur, that is processes vaporize of the fuel. Decomposition processes need a lot of heat, run slowly down than processes of the preparation of the mixture in gas phase of. The influence of the pressure on processes of the combustion of liquid fuels differs from the influence on the processes of the combustion of fuel gases. Pressure increasing decreases the intensity decomposition of the liquid phase. Flow of combustion gases intensifies combustion processes. Example-test results PIV velocity field, test results with LDV and PDPA are presented in the paper. The linear and volumetric distribution of the drop, and the Rosin - Rammler dependences as well as the course of the combustion process in the constant volume chamber are an object of the paper. The paper describes the mathematical model of the combustion process of the liquid fuel. Realized initial measurement of the boundary-layer thickness under model conditions with using of the LDV laser-equipment showed that the close relationship between the kinds of the boundary-layer existed, with its thickness and rate of the combustion of liquid fuels, washed with the gases stream. The pressure additionally bears on the velocity component of combustion rate, whereat this influence depends mostly from the kind of the fuel.

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Study of the influence of different factors on combustion processes (Part one)

Jankowski A.

Journal of KONES

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2009

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Vol. 16, No. 1

209-216

EN

Combustion processes of liquid fuels are more complicated than gases fuels ones. With reference to liquid fuels appear additionally fuel vaporization processes and e.g. with reference to solid fuels - decomposition of the solid phase with processes melting, vaporization, pyrolysis, or gasification. Those processes demand a lot of heat, go ahead slow down than processes in gas phase. The influence of the gases pressure on combustion of liquid and solid fuels, where controlling processes are processes decomposition of these phases, is more complicated and fundamentally differs from the influence of the pressure on combustion processes of gases fuels. The influence is characterized to these that pressurization decreases the intensity decomposition both the liquid phase, and solid one. In the paper assumptions to a model of the combustion process and the model of combustion processes of liquid fuels are presented. Research of the atomization process, ignition and combustion with the using of the LDV and PDPA Doppler laser-equipment and PIV are presented in the paper. Research results of the atomized fuel spray concerning droplet diameters, research result of the atomized fuel spray concerning linear and volumetric dropletlet dispersion, Rosin-Rammler dependences, and results of the analysis of the combustion rate are presented in the paper. On combustion rate of liquid fuels, the essential influence has a kind (laminar, transient and turbulent) and the thickness of the thermal boundary layer around the fuel droplet.

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High-peak-power lasers at the IPPLM, Warsaw.

Badziak J.

Optica Applicata

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2000

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Vol. 30, nr 1

5-25

EN

A short review of major achievements in research on high-peak-power lasers carried on for over twenty years at the Institute of Plasma Physics and Laser Microfusion (IPPLM) is carried out. The most important trends in the IPPLM's research on high-peak-power neodymium, CO/sub 2/ and excimer lasers are discussed. The largest laser systems built within the scope of this research, particularly four-beam nanosecond 100-GW and picosecond terawatt Nd:glass lasers and nanosecond 10-GW CO/sub 2/ laser are presented.