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90 Victor Pantilie et al. Tang X., Kabat D.M., Natkin R.J., Stockhausen W.F., Heffel J., Ford P2000 Hydrogen Engine Dynamometer Development. SAE Paper 2002-01-0242 (2002). Verhelst S., Wallner T., Hydrogen-fueled Internal Combustion Engines. Progress in Energy and Combustion Science, 35, 1, 490-527 (2009). Winterbone D.E., Pearson R.J., Theory of Engine Manifolds Design. London: Professional Engineering Publishing, London, 2000. Yamin J.A.A., Gupta H.N., Bansal B.B., Srivastava O.N., Effect of Combustion Duration on the Performance and Emission Characteristics of a Spark Ignition Engine Using Hydrogen as a Fuel. Int. J. Hydrogen Energy, 25, 6, 581 (2000). STUDIU ASUPRA PERFORMANŢELOR MOTORULUI CU APRINDERE PRIN SCÂNTEIE ALIMENTAT CU HIDROGEN (Rezumat) Lucrarea prezintă rezultatele modelării termo-gazo-dinamice la folosirea hidrogenului în motorul cu aprindere prin scânteie. Rezultatele obţinute arată că hidrogenul este un combustibil excelent, care permite funcţionarea motorului cu performanţe energetice ridicate şi emisii poluante reduse atunci când se foloseşte supraalimentarea şi valori ale coeficientului de exces de aer λ>1.8.
BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi“ din Iaşi, Tomul LVIII (LXII), Fasc. 4, 2012 Secţia CONSTRUCŢII DE MAŞINI ASPECTS REGARDING THE USE OF BIOETHANOL IN SPARK IGNITION ENGINES BY ALEXANDRU RADU ∗ , CONSTANTIN PANĂ and NICULAE NEGURESCU “Politehnica” University Bucharest, Department of Mechanical Engineering and Mechatronics Received: 10 March 2012 Accepted for publication: 22 April 2012 Abstract. During the last years the spark ignition engines have been further improved in order to reduce carbon dioxide emissions (and thus the greenhouse effect) and fuel consumption, and increasing the engine performance. The use of alternative fuels represents an efficiency solution for these objectives. This explains the intense interest world-wide to using bioethanol (originating from renewable sources) as an automotive fuel, especially in blending with gasoline. This paper presents results of simulating to thermo-gas-dynamics processes inside the cylinder of an SI engine fuelled with ethanol-gasoline blends with different percentages of ethanol at different engine operating conditions. The main topics presented are the effects of using blends on: engine performance, emissions and fuel consumption. The results showed that an improved engine performance and lower emissions can be obtained with higher ethanol percentage in the blend, due to the better combustion properties ethanol. Keywords: spark ignition engine, bioethanol, fuel properties characteristics, simulation, NOx emissions. 1. Introduction Considering the energy crisis and pollution problems, our investigations have been concentrating on reducing the fuel consumption and lowering the concentration of toxic components in combustion products by opting for alternative fuels. Ethanol is considered as an ideal alternative fuel. Ethanol has been recognized as an alternate fuel because of highly desirable properties. ∗ Corresponding author: e-mail: radu_alex_85@yahoo.com
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