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Wyświetlanie 1-2 z 2
Tytuł:
Diffraction of light by acoustic waves in liquids
Autorzy:
Wijewardena Gamalath, K. A. I. L.
Jayawardena, G. L. A. U.
Powiązania:
https://bibliotekanauki.pl/articles/411835.pdf
Data publikacji:
2012
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
opóźnienie fazy
akustyczno-optyczne interakcje
parametr Kleina-Cooka
dyfrakcja Bragga
dyfrakcja Ramana-Natha
acusto-optic interactions
Raman-Nath and Bragg diffraction
Klein Cook parameter
phase delay
Opis:
For the acusto-optic interactions in liquids, an equation for the diffraction light intensity was obtained in terms of Klein Cook parameter Q. With optimized parameters for Q, incident light wave length of _=633 nm, sound wave length of _=0.1 mm, acusto-optic interaction length L=0.1 m, and refractive index of the liquid in the range of 1 to 2, the existence of ideal Raman-Nath and Bragg diffractions were investigated in terms of phase delay and incident angle. The ideal Raman-Nath diffraction slightly deviated when the Klein Cook parameter was increased from 0 to 1 for low chase delay values and for large phase delay, the characteristics of the Bessel function disappeared. Higher value of Klein Cook parameter gave Bragg diffraction and ideal Bragg diffraction was obtained for Q~100. A slight variation of the incident angle from Bragg angle had a considerable effect on Bragg diffraction pattern. Klein Cook parameter with the change of acoustic wave frequency was investigated for liquids with refractive index in the range1.3-1.7 and their diffraction patterns were compared with practically applicable acusto-optic crystals. For acusto-optic diffractions in liquids, sound velocity plays an important role in Bragg regime with Q increasing with increasing acoustic frequency. As acoustic wave frequency exceeded 10 MHz most of the liquids reached Bragg regime before these crystals.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2012, 4; 39-57
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combustion stability of dual fuel engine powered by diesel-ethanol fuels
Autorzy:
Nowak, Łukasz
Tutak, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/133775.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
combustion stability
heat release
dual fuel
ignition delay
combustion phases
stabilność spalania
wydzielanie ciepła
gazodiesel
opóźnienie zapłonu
fazy spalania
Opis:
The paper presents result of combustion stability assessment of dual fuel engine. The authors analyzed results of co-combustion of diesel fuel with alcohol in terms of combustion stability. The comparative analysis of both the operational parameters of the engine and the IMEP, as the parameters determining the stability of the combustion process, were carried out. It was analyzed, among others values of the COVIMEP coefficient, the spread of the maximum pressure value, the angle of the position of maximum pressure and the probability density distribution of the IMEP. The experimental investigation was conducted on 1-cylinder air cooled compression ignition engine. The test engine operated with constant rpm equal to 1500 rpm and constant angle of start of diesel fuel injection. The engine was operated with ethanol up to 50% of its energy fraction. The influence of ethanol on ignition delay time spread and end of combustion process was evaluated. It turns out that the share of ethanol does not adversely affect the stability of ignition.
Źródło:
Combustion Engines; 2019, 58, 3; 155-161
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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