
701Diesel Engines
in Figure 30.20 by varying the ame lift-off length,H.
As charge-gas temperature lowers, H increases.
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Increasing H increases the amount of oxygen entrained
from the charge-gas by the time the reactants reach the
lift-off length.
Figure 30.20 shows that Ω(H) can be raised from ∼7%
to ∼20% by lowering the charge-gas temperature from
1300 to 950 K (moving from point A to B). This way SINL
decreases by a factor of 1.6. On the other hand, an equal
raise of Ω(H) can be achieved by adding the oxygenate
TPGME to the fuel and operating at the initial 1300 K
condition, which corresponds to point C. This way we
can move from point A ...