Advancings on Nozzle Tip Temperature Control in a Dual Fuel Engine
Fabio E. Czarneski1; Gabriel L. Milanez1; Stephan H. Och2; Luís M. Moura2
1 Robert Bosch Ltda, Diesel Systems, DS/EDF-LA, Curitiba, Brazil; 2 Pontifical Catholic University of Paraná - PUCPR, Curitiba, Brazil
doi:10.20906/CPS/COB-2015-1686
Resumo
In this experimental study, carried out in a dual fuel Diesel-CNG engine, a general characterization of the diesel injector nozzle tip temperature (NTT) is presented. Measurements were done in a three phase asynchronous dynamometer with objective of quantification of the influences of diesel substitution rate, injection phasing, injection pressure and air-fuel ratio over the nozzle tip temperature. High NTT values increase the formation rate of coking on nozzle holes. The first experimental results showed that temperature increases with increasing on substitution rate, with injection timing advancing and with reduction on air fuel ratio. Rail pressure at 60% of substitution rate has also significant influence on NTT values. These results suggest that the referred engine parameters play a important role on NTT control and have to be considered, not only at the end of calibration, but also during engine calibration work to obtain a good trade-off between NTT and other engine limitations.
Palavras-chave: Nozzle tip temperature; dual fuel; diesel-CNG; NTT