15.8 THERMODYNAMIC CYCLE WITH SUPEH

15.8 THERMODYNAMIC CYCLE WITH SUPEHCHAFIGING
Figure 15.3(a) shows the normally aspirated cycle on p-V diagram for the idealized constant
volume four-stroke cycle with line 1-5 representing both the induction and exhaust strokes at
about the ambient air pressure pa. An ideal p-V diagram for a supercharged constant volume
cycle in which the blower or compressor is driven mechanically from the engine is shown in
Figure l5.3(b). The physical arrangement is shown in Figure l5.2(a). The inlet pressure to the
engine is pi and the exhaust from the engine is at atmospheric pressure pa,. The effects are to
increase the pressures reached during the cycle and to give a positive pumping loop l-5-6-7-1
for addition to the main working loop 1-2-3-4-l.