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خنککننده میانی
} The turbocharged engine in Fig. 1-10 has an intercooler to reduce the inlet charge temperature.
The above discussion illustrates why turbocharged spark-ignition engines normally have lower compression ratios than naturally aspirated engines, use substantial mixture enrichment (up to " 1.3) at high boost to cool the charge, often use an intercooler to reduce the charge-air temperature, and operate with
Even with the use of very rich mixtures and spark retard at WOT, lower compression ratios for turbocharged engines, and intercooling, knock avoidance requires that boost pressures (which would continue to rise with increasing engine speed in the absence of any control) be maintained approximately constant.
The 2.1-dm3 turbocharged but not intercooled engine (which also does not have a knock sensor to control spark advance) requires a lower compression ratio and achieves less of a bmep gain than the 2.3-dm3 turbocharged intercooled engine with its knock-sensor spark-advance control, which together permit use of a higher compression ratio.
Supercharged with (2) Roots blower; (3) Comprex (with and without intercooler); (4) turbocharger.
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