8th International conference on turbochargers and by CRC Press

By CRC Press

Construction at the good fortune of a longtime sequence of winning meetings held each 4 years considering 1978, this booklet includes the lawsuits of the eighth foreign convention on Turbochargers and Turbocharging. It provides the most recent applied sciences on the subject of engine strain charging platforms from foreign and educational specialists within the box, overlaying new advancements in compressors and novel consumption platforms; more suitable types for cycle simulation; electro advance structures; tendencies and necessities; generators; and mechanical features resembling thermomechanical research, dynamics, and axial load potential.

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DaimlerChrysler calls this new charger concept DOT (Delay Optimized Turbocharger). The goal is to operate the turbocharger at a quasi-stationary speed state. The energy necessary for the higher initial speed comes from using the enthalpy potential gained from the throttling principle, which is the basis of common spark ignition engines. To do so, the radial flow compressor of the turbocharger is operated as a cold air turbine. The necessary conceptual redesign of the classic turbocharger compressor and its effect on engine operation is presented below.

GJ /' III III ~/ ~ D.. / l4'" . I ':v '" ~ AI\ 1/ ': I [) :1 V •. t, .. ' . Q. ' o o 240 \.. ,. r,r-. 8 " 420 430 440 450 ~ 460 210 ~ l II ... ---121 470 E ~ 200 Qj ~ o , .... V' "' ...... Q. ~ ~GO Q. ", ::-::-.... g,. ~ ~@ 4000 revfmin points' ~ 260 Pressure ~ rr ...... f' :s 270 J. 230 I I I 480 490 8 170 500 510 Compressor Impeller Tip Speed (m/sl Fig. 7 Engine test data for test ducts 7. CONCLUSIONS • • • • The performance of the turbocharger compressor can be influenced by the design of the inlet duct.

Firstly, attention should be paid to the margin to the choke line to avoid an excessive de-rate to prevent turbo overspeed at altitude. In addition, the effect of compressor efficiency on compressor outlet temperatures (a potential durability and compressor fouling concern) and fuel economy should be considered. For this case study, although there was some resulting compromise to these attributes, this was considered acceptable against the reduction in whoosh noise achieved. Finally, it should also be remembered, that engine calibration has an influence on the whoosh noise by controlling the point at which the engine operates on the map.

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