Fig. 1. Pressure curve and rate of heat release in diesel engine. Boost pressure : 0 [kPa] Boost pressure : 100 [kPa] Boost pressure : 240 [kPa] TDC 1 2 5 10 15 20 30 Fig. 2. High-speed photographs of diesel combustion ( Pinj = 100 MPa, O= 3.5, H= 16, Ne = 1000 rpm ).
Experimental results of High boosting combustionThe pressure diagrams and the rates of heat release are shown in Fig. 1, when the boost pressure increased. Figure 2 shows the combustion photographs under the conditions, which are approximately 3.5 times intake air of NA engine, the air excess ratio O= 3.5 constant, the nozzle specification 0.17×6 and the injection pressure Pb=100MPa. The high boosting gives good combustion and high thermal efficiency. It is very difficult to take combustion photo in a diesel engine due to high cylinder pressure but we success in 15MPa such as high cylinder pressure. 0.4 0.2 0 -0.2 0 30 NA 100kPa 240kPa Crank angle [deg.] 60 ROHR [ᰛJᯟdeg.] 0.6 30 0 20 15 10 5 0 NA 100kPa፧ 240kPa፧ Cylinder Pressure [MPa] 60 Crank angle [deg.] -30 -60
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