Wyniki wyszukiwania - BazTech

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Measurement of flame temperature and soot amount for effective NOx and PM reduction in a heavy duty diesel engine

Aoyagi Yuzo

Combustion Engines

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2019

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R. 58, nr 4

32--39

EN

To reduce exhaust NOx and smoke, it is important to measure flame temperature and soot amount in combustion chamber. In diesel combustion it is effective to use the two-color method for the measurement of the flame temperature and KL factor, which is related with soot concentration. The diesel flame was directly and continuously observed from the combustion chamber at running engine condition by using a bore scope and a high-speed video camera. The experimental single cylinder engine has 2.0-liter displacement and has the ability with up to five times of the boost pressure than the naturally aspirated engine by external super-charger. The devices of High Boost, Wide Range and High EGR rate at keeping a relatively high excess air ratio were installed in this research engine in order to reduce exhaust NOx emission without smoke deterioration from diesel engines. The video camera nac GX-1 was used in this study. From observed data under the changing EGR rates, the flame temperature and KL factor were obtained by the software of two-color method analysis. The diesel combustion processes are understood well by analyzing high-speed movies of the diesel flame motion and its temperature. The NOx and smoke are mutually related to maximum flame temperature and also it is possible to reduce simultaneously both NOx and soot emissions by high EGR rate in a single cylinder diesel engine.

2

Optical identification of the combustion of air-fuel mixture surrounded by non-combustible gas in a rapid compression machine

Cieślik W., Pielecha I., Wisłocki K.

Archivum Combustionis

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2017

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Vol. 37 nr 2

93--106

EN

The influence of non-combustible gas injection on combustion rates in an engine cylinder with centrally positioned ignition point has been discussed. The flame temperature distribution and its changes were taken into account in this research. The analysis of the influence of exhaust gas content in the cylinder on the combustion process has been based on the interpretation of high speed camera images for the period from the ignition start to full flame coverage of the combustion chamber. Authors performed a comparative analysis of the combustion process thermodynamic parameters based on the obtained characteristics. In order to demonstrate the charge stratification influence and the proportion of flue gas in the cylinder, a flame propagation analysis was performed through high frequency image sampling and using the flame temperature distribution in the combustion volume. The two-color method was used for determining this temperature. A flame temperature distribution example at selected combustion process stages was presented as well as for the entire combustion process. A significant reduction in the area covered by the flame was shown to be the result of an increase in the flue gas proportion in the cylinder. The flame area reduction was found to be 46% when using a 25% EGR share, while with an EGR contribution of 40%, the flame area was decreased by 78%. The flame covered area reduction was the result of "fencing" of the flame from the cylinder walls by an exhaust gas layer. According to changes in the flame area, the largest share of high temperatures, in the range 1800-2000 K, has also decreased from around 19% to 23%.

3

Wpływ rodzaju filtrów optycznych na określenie temperatury w komorze spalania

Borowski P., Pielecha I., Cieślik W., Chwalisz Ł.

Logistyka

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2014

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nr 6

2219--2226

PL

Obecne silniki spalinowe wyposażone są w precyzyjne układy sterowania dawką paliwa oraz nowoczesne układy zapłonowe. Możliwości poprawy wskaźników pracy silników wymagają dokładnej analizy procesu spalania. Artykuł dotyczy sposobów określania temperatury za pomocą badań optycznych. Optyczna rejestracja procesu spalania jest jedną z metod wykorzystywaną do analizy rozkładu temperatury płomienia. Opisano wyniki badań przeprowadzonych za pomocą metody dwubarwowej. Określono wpływ zastosowania różnych filtrów optycznych na wyniki analiz. Wskazano na możliwości poprawy zakresu pomiaru mniejszych wartości temperatury przez zastosowanie odpowiedniej kombinacji filtrów barwnych.

EN

The current internal combustion engines are equipped with a precise control system of fuel doses and combustion processes. The possibility to improve the indexes of engines requires a thorough analysis of combustion processes. The optical research of combustion process is one of the methods for analysing of flame distribution. The article discusses possibilities of determining the temperature using optical access. The results of usage of two-color method are described. The effect of using different optical filters measurements on measured results is determined. The possibility of improve the range of lower temperature measurements by usage of red and green filters is identified.