Browsing by Author "Fenkl, Michael"
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- ItemEffects of injection and ignition timing of a large direct injection spark ignition engine fuelled with a hydrogen-CNG mixture on its operating conditions and emissions(Technical University of Liberec, Dept. of Power Eng. Equipment, Studentská 2, Liberec 1, Czech Republic, 2017-02-15) Fenkl, MichaelThe effects of ignition and fuel injection timing of an experimental 2-liter single cylinder direct injection spark ignition gaseous fuel engine were examined experimentally in this study. An online-prepared mixture of 10-40% hydrogen with compressed natural gas was injected at 8 bar into the cylinder during the intake stroke at 1500 rpm. Heat release rates, maximum indicated pressures, cycle-to-cycle variability, and gaseous emissions were compared for different settings. © The Authors, published by EDP Sciences, 2017.
- ItemInternal Combustion Engines as the Main Source of Ultrafine Particles in Residential Neighborhoods: Field Measurements in the Czech Republic(MDPI, 2015-01-01) Štolcpartová, Jitka; Pechout, Martin; Dittrich, Luboš; Mazáč, Martin; Fenkl, Michael; Vrbová, Kristýna; Ondráček, Jakub; Vojtíšek-Lom, MichalUltrafine particles (UFP, diameter < 100 nm) exposure has already been associated with adverse effects on human health. Spatial distribution of UFP is non-uniform; they concentrate in the vicinity of the source, e.g. traffic, because of their short lifespan. This work investigates spatial distribution of UFP in three areas in the Czech Republic with different traffic load: High traffic (Prague neighborhood—Sporilov), commuter road vicinity (Libeznice), and a small city with only local traffic (Celakovice). Size-resolved measurements of particles in the 5–500 nm range were taken with a particle classifier mounted, along with batteries, GPS and other accessories, on a handcart and pushed around the areas, making one-minute or longer stops at places of interest. Concentrations along main roads were elevated in comparison with places farther from the road; this pattern was observed in all sites, while particle number distributions both close and away from main roads had similar patterns. The absence of larger particles, the relative absence of higher concentrations of particles away from the main roads, and similar number distributions suggest that high particle number concentrations cannot be readily attributed to sources other than internal combustion engines in vehicles and mobile machinery (i.e., mowers and construction machines).
- ItemOptimalizace turbodmychadla pro vodíkový šestiválcový motor(2005-01-01) Fenkl, Michael
- ItemSpalování směsi vodílu se zemním plynem v zážehovém PSM(Technická Univerzita v Liberci, 2012-01-01) Fenkl, Michael; Scholz, CelestýnDDP popisuje inovativní způsob výpočtu průběhu teploty ve válci motoru. Tento způsob výpočtu používá jako vstupní hodnoty experimentálně získaná data a známá data popisující složení paliva. Tento postup lvýpočtu je v DDP detailně popsán, společně s výpočtem adiabatické teploty plamene pro směsné palivo. V experimentální části jsou dále diskutovány vlivy seřizovacích parametrů na emisní parametry motoru a vlivy změny složení paliva na emisní a výkonové parametry motoru.