2 documents found, page 1 of 1
Turpentine as an additive for diesel engines: experimental study on pollutant e...
Chivu, Robert Mădălin; Martins, Jorge; Popescu, Florin; Uzuneanu, Krisztina; Ion, Ion V.; Gonçalves, Margarida; Codau, Teodor Cezar; Onofrei, ElenaThe need for reducing fossil fuel consumption and greenhouse gas (GHG) emissions in internal combustion engines has raised the opportunity for the use of renewable energy sources. For the progressive replacement of fossil fuels like diesel, those derived from the sustainable management of forest resources may be a good option. In Portugal, pine trees (pinus pinaster) are among the most widely cultivated tree sp...
Thermodynamic analysis of an over-expanded engine
Martins, Jorge; Uzuneanu, Krisztina; Ribeiro, Bernardo Sousa; Jasansky, OndrejWhen the exhaust valve of a conventional spark ignition engine opens at the end of the expansion stroke, a large quantity of high pressure exhaust gas is freed to the atmosphere, without using its availability. An engine that could use this lost energy should have a better efficiency. The equations for an over-expanded cycle (Miller cycle) are developed in this paper, together with equations for the Otto cycle,...