Fenomen górnej granicy wybuchowości (GGW) paliw w powietrzu i tlenie w warunkach podwyższonego ciśnienia i temperatury

• Autorzy: Rarata G.

Warianty tytułu

EN

The phenomenon of upper explosion limit of fuels in air and oxygen at elevated temperature and pressure

• Języki publikacji: EN

Abstrakty

EN

The presented research work has been done in the Institute of Heat Engineering laboratories at Warsaw University of Technology. The explosive range of chosen gases is determined by specific conditions of temperature and pressure. These values also depend on different factors, such as the shape of the explosion vessel, ignition energy or the presence of other substances which may, for instance, have catalytic properties. The obtained results relate the influence of chosen physical parameters on the value of the Upper Explosive Limit (UEL). Other research data is also presented in the paper. This was obtained from specially designed spherical explosion chamber of a volume of 2.3 dm3. Exploding wire was used as the ignition source. It released about 0.1 J energy each time. The influence of the increased initial temperatures of those mixtures on their value of UEL was also investigated in the range of 20°C up to 200°C. Further experiments on the influence of elevated conditions, as well as the position of ignition source and residence time, were carried out as well. A number of higher alkanes were examined (up to n-butane), both in air and oxygen mixtures. These experiments allowed the author to find distinct dependencies in the values of UEL under the investigation conditions. The results have been compared and validated with literature data and numerical code, according to the experimental conditions, methodology and adopted criteria of UEL determination. Some of the effects found were possible to explain only by acceptance of such phenomenon as cool flames appearing in the regions close to UEL. This seems to be particularly important when safety parameters or numerical modelling standards for UEL are sought.

PL

Przedstawiona paca doświadczalna została wykonana w laboratoriach Instytutu Techniki Cieplnej PW. Artykuł zawiera wyniki serii pomiarów, których celem było ustalenie wpływu wybranych parametrów fizycznych na wartość ciśnienia wybuchu dla mieszanin gazowych alkanów z tlenem. Dane takie, łącznie z wyznaczoną wartością górnej granicy wybuchowości (GGW) dla poszczególnych mieszanin, mają podstawowe znaczenie dla ustalania odpowiednich norm bezpieczeństwa w przemyśle chemicznym. Badaniom poddano gazowe alkany, a więc metan, etan, propan oraz n-butan. Wyniki, prezentowane w postaci sumarycznych danych (tabel), zostały uzyskane w wyniku przeprowadzenia pomiarów w stalowym naczyniu kulistym o objętości 2,3 dm3. Jako źródło zapłonu użyto tzw. eksplodujący drucik (exploding wire), który uwalniał około 0,1 J energii za każdym razem. Przebieg zmian ciśnienia w czasie rejestrowano przy użyciu szybkiego czujnika piezoelektrycznego. Zbadano wpływ temperatury początkowej mieszanin testowych, w zakresie od 20°C do 200°C. Przeprowadzono również pomiary w zakresie wzrastającego ciśnienia początkowego mieszanin. Na ich podstawie autor wyznaczył wyraźne zależności GGW od początkowej wartości T oraz p badanych mieszanin.

Słowa kluczowe

EN

Institute of Heat Engineering at Warsaw University of Technology; upper explosion limit of fuels in air and oxygen; elevated temperature and pressure; EPATS European Personal Air Transportation System

PL

Instytut Techniki Cieplnej (PW); górna granica wybuchowości paliw w powietrzu i tlenie; warunki podwyższonego ciśnienia i temperatury; EPATS Europejski System Transportu Małymi Samolotami

• Wydawca: Wydawnictwa Naukowe Instytutu Lotnictwa
• Czasopismo: Prace Instytutu Lotnictwa
• Rocznik: 2010
• Tom: Nr 2 (204)
• Strony: 1--70
• Opis fizyczny: Bibliogr. 86 poz., rys., tab., wzory

Twórcy

autor

Rarata G.

• Institute of Aviation

Bibliografia

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