Download PDF by Apostolos Pesiridis: Automotive Exhaust Emissions and Energy Recovery

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  • March 17, 2018
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By Apostolos Pesiridis

ISBN-10: 1633214931

ISBN-13: 9781633214934

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The pilot energizing time also was fixed; while the main energizing times of RME was properly adjusted in order to obtain the same BMEP. In particular, injection duration was increased because of the lower LHV of RME. The amount of EGR was set at 57% and 35% for 1500 rpm and 2000 rpm, respectively. The VSA system was set at 66% and 27% for 1500 rpm and 2000 rpm, respectively. The main engine parameters are listed in Table 3. Table 3. 5 -2 -2 ET Main [s] Prail [bar] EGR [%] VSA [%] 600 640 556 594 500 500 730 730 57 57 35 35 66 66 27 27 40 Silvana Di Iorio, Ezio Mancaruso and Bianca Maria Vaglieco Thermodynamic Analysis The in-cylinder pressure, the rate of heat release (ROHR) and the injector energizing current versus the crank angle degree (cad), over the end of compression and the early expansion stroke are depicted in Figure 3.

In-cylinder soot size distribution evaluated at 1500 rpm (left) and 2000 rpm (right) at 10 cad and 12 cad ATDC (up) and 25 cad and 30 cad ATDC (down). At 1500 rpm, RME is characterized by a larger soot particle concentration at the first crank angle. This result can be due to the different fuel chemical and physical properties. In particular, because of the higher viscosity and density of RME, larger droplets with respect to diesel fuel are produced. This effect is more evident at 1500 rpm because of the lower injection pressure.

The start of combustion (SOC) is determined by the analysis of the heat release rate (ROHR) trace. From a general point of view the start of combustion was detected when the energy release begins to exceed the energy losses due to the fuel evaporating process [80]. The SOC of the pilot injection occurred at 8° before top dead center (BTDC) while the SOC of main injection occurred at 1° after top dead center (ATDC) at 1500 rpm and for both fuels. At higher engine speed, the SOC of main injection occurred at 7° ATDC for both fuels.

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Automotive Exhaust Emissions and Energy Recovery by Apostolos Pesiridis


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