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1
Content available remote Erozja w komorze schładzania spalin : numeryczna symulacja zjawiska
Malcher T.
Przemysł Chemiczny
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2017
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T. 96, nr 8
1707--1708
PL
Opisano wyniki symulacji numerycznej erozji w komorze schładzania spalin, pozwalające określić, gdzie znajdują się obszary konstrukcji najbardziej narażone na ścieranie pod wpływem uderzających w nie cząstek stałych. Obliczenia wykonano za pomocą oprogramowania CFD.
EN
Erosion of the cooling chamber walls was numerically simulated to det. the areas most exposed to abrasion with impacted solid particles of fly ash.
2
Content available Concentrations of carbon monoxide and nitrogen oxides from a 15 kW heating boiler supplied periodically with a mixture of sunflower husk and wood pellets
Juszczak M.
Environment Protection Engineering
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2014
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Vol. 40, nr 2
65--74
EN
The impact of periodic feeding mode on the concentrations of carbon monoxide (CO) and nitrogen oxides (NO, NOx) in the flue gas downstream the boiler was analyzed during firing of a mixture of sunflower husk and wood pellets in an overfeed furnace. The mixtures containing 100, 70 and 50 wt. %, of sunflower husk pellets were supplied to the boiler in two feeding modes: 1 s of operation 4 s of stand-by and 1s of operation 6 s of stand-by. Correlation between pollutant concentrations and the temperature in the combustion chamber was evaluated. The following concentrations of CO for various feeding modes and sunflower husk pellet proportions have been obtained: 1:6,100% - 6150 mg/m3,1:6,70% - 3360 mg/m3, 1:6, 50% - 2600 mg/m3, 1:4,100% - 4580 mg/m3,1:4, 70% - 2570 mg/m3, 1:4,50% - 870 mg/m3 for 10% O2 content in the flue gas. The study indicates the advisability of reducing the stand-by period in the pellet feeding system.
3
Content available remote Pollutant concentrations from a 15 kW heating boiler supplied with sunflower husk pellets
Juszczak M.
Environment Protection Engineering
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2012
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Vol. 38, nr 1
35-43
EN
Sunflower husk pellets were fired in a channel type furnace originally designed for wood pellets. The furnace was installed in a 15 kW heating boiler. CO, CxHy, NO, NO2 and dust concentrations were measured. Despite reducing the temperature in the furnace down to ca. 700 °C by fuel stream reduction, ash melting and sintering phenomenon could not be completely avoided. CO concentration of ca. 6500 mg/m3 (10% O2) was observed, boiler heat efficiency being 63%. A test for sunflower husk and wood pellet mixture showed a reduction of CO concentration down to 2153, 1683 and 966 mg/m3, respectively (10% O2), wood pellet volume proportion being 25, 50 and 75%, respectively, and hydrocarbon concentration almost down to zero. The impact of temperature in the combustion chamber and oxygen concentration on pollutant concentrations was determined.
4
Content available Analiza miejsc przegrzanych komory spalania silnika rakietowego na paliwo stałe po próbie dynamicznej na hamowni
Łapiński Z.
Problemy Techniki Uzbrojenia
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2008
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R. 37, z. 108
103--118
PL
W artykule przedstawiono zakres i wyniki badań miejsc przegrzanych komory spalania rakietowego silnika na paliwo stałe, po jego próbie na hamowni. W wyniku badań dynamicznych jednego z silników rakiet plot. zaobserwowano dwa, wyraźne obszary przegrzania płaszcza komory spalania. W celu określenia wpływu przegrzania materiału na jego własności wytrzymałościowe, a w rezultacie na własności użytkowe silnika i bezpieczeństwo obsług w czasie strzelań, przeprowadzono niezbędne badania materiałowe i obliczenia wytrzymałościowe. W artykule przedstawiono wyniki badań makroskopowych, ultradźwiękowych, metodą pamięci magnetycznej oraz endoskopowych na całych silnikach, jak również na wyciętej z miejsca przegrzania próbce. Zmierzone charakterystyki materiału komory z miejsc nie uszkodzonych i przegrzanych zostały wykorzystane do przeprowadzenia obliczeń wytrzymałościowych silników z powyższą wadą (przegrzanie) i określenia współczynnika bezpieczeństwa.
EN
Some results of tests and analysis of overheated spots of the solid propellant rocket motor burning chamber after its trial on a test bed are presented in the paper. In the result of dynamic trials two distinctly visible areas of overheating were spotted in a motor burning chamber cover. In order to evaluate the impact of this overheated material into its strength properties and finally the effectiveness of the motor and the safety of personnel at firing the necessary tests of stuff and fatigue calculations were carried out. Some results of macroscopic, ultrasound, magnetic memory and edoscopy tests carried out on the whole stuff of motor and on the overheated part are presented. Measured characteristics of stuff from not affected by heat and overheated areas were used to calculate its mechanical resistance and coefficient of safety for motors affected by possible overheating.
5
Content available Four-Stroke Engine With Central Located, Divided Combustion Chamber
Dymarski C., Rolka G.
Journal of Polish CIMAC
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2008
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Vol. 3, no 1
9-13
EN
The paper presents an original solution of the modern engine with the central located, divided combustion chamber. Such solution gives much better utilization of the warm what means that the efficiency of the engine should be higher and the fuel consumption and emission of the noxious gases such, as nitric oxides (NC), hydrocarbons (HC) and carbon dioxides (CO2), will be reduced. The engine can work on liquid or on gas fuels. Presently the prototype of this engine is being prepared for tests and some investigation works.
6
Content available Optical method of registration of process of the injection and the burning in the chamber of the cylinder of the engine GDI
Sendyka B., Noga M., Cygnar M., Budzik G.
Journal of KONES
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2008
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Vol. 15, No. 4
495-500
EN
In this article method of a visualization of a process of injection and burning of the air-fuel mixture was presented in cylinder of engine GDI. Intention of the visualization is a possibility of a determining and a selection how the most profitable parameters of injection for the work of engine during burning of the various load. Apparatus of the firm AVL - VideoScope 513 D was used to performance of positional tests, having on purpose registration of a dislocation of the stream of the fuel from the moment of injection, one by one a reflection of fuel from of the bottom of the piston until for the connection under the spark plug, and next an expansion of the flame from moment of the ignition until to the end of process of burning. Results of carried out visualization are in form files of the type of avi. These files are intended to a presentation of a record of respective frames as a moving image. From editorial reasons in this article, results of visualization are presented in a form of single cinematographic frames following in turn after themselves what the certain degree of the angle of the rotation of the crankshaft. Values of angles for which next frames were presented are placed in a bottom left corner of a single frame. All executed registrations archive images in the function of angle of rotation of crankshaft no from one, but from many of the cycles of the work of engine
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