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80 Ion Zabet and Graţiela-Maria Ţârlea Măsurătorile au fost făcute la secundă, mediate pe un interval de timp de 5 minute după atingerea echilibrului termodinamic. In urma cercetărilor efectuate s-a deschis perspectiva unor noi direcţii de studiu în domeniul optimizării sistemelor frigorifice în procesul de injecţie cu vapori la compresoarele scroll cum ar fi: simplificarea modelelor de calcul care să conţină un număr cât mai redus de parametri şi ecuaţii, continuarea studiului cu aplicaţii în domeniul pompelor de căldura, analizarea performanţelor sistemelor frigorifice şi de aer condiţionat funcţionând cu compresoare scroll pentru diverşi agenţi frigorifici ecologici (cu ODP zero şi GWP redus).
BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi“ din Iaşi, Tomul LVIII (LXII), Fasc. 4, 2012 Secţia CONSTRUCŢII DE MAŞINI A STUDY ON PERFORMANCE OF A HYDROGEN FUELLED SPARK IGNITION ENGINE BY VICTOR PANTILE ∗ , CONSTANTIN PANĂ and NICULAE NEGURESCU “Politehnica” University of Bucureşti, Department of Mechanical Engineering and Mechatronics Received: 26 March 2012 Accepted for publication: 14 April 2012 Abstract. The use of alternative fuels represents a reliable alternative to decrease the pollutant emissions and it can also increase the independence regarding the fossil fuels. The combustion properties of hydrogen make this fuel one of the best solution to replace the classical fuels. Many researches using hydrogen were made and most of them had good results. In addition to experimental research, the modelling of the thermo-gas-dynamics processes inside the cylinder represents an effective investigation tool of engine operation, reducing the time duration and cost of experimental investigation. The paper presents results of the thermo-gas-dynamics processes modelling inside the engine fuelled with hydrogen. The results obtained show that hydrogen is an excellent fuel, allowing engine operation with the best energetically and pollution performance. At the use of hydrogen the engine load qualitative control strategy can be adopted together with the quantitative adjustment. Key words: internal combustion engines, hydrogen, modelling, performance. 1. Introduction Considering the pollution problems and the declining fuel reserves today, investigations have been concentrating on increasing efficiency and lowering the pollutant emissions by using alternative fuels. Due to its properties, hydrogen is considered an ideal alternative fuel and ∗ Corresponding author: e-mail: pantilevictor@yahoo.com
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