The schematics show three different four-stroke cycle spark-ignition engine combustion chambers. A and B are two-valve engines, C is a four-valve engine (two inlet valves which open simultaneously,...


The schematics show three different four-stroke cycle spark-ignition engine combustion chambers. A and B are two-valve engines, C is a four-valve engine (two inlet valves which open simultaneously, two exhaust valves). Dimensions in millimeters are indicated. A and C have normal inlet ports and do not generate any swirl, B has a helical inlet port and generates substantial swirl. Spark plug locations are indicated. All three engines operate at the same speed (3000 revjmin), with the same inlet mixture composition, temperature, and pressure, and have the same displaced volume.


(a) Rank the chambers 1,2, 3 in the order of their volumetric efficiency (1 = highest 7l3


(b) Rank the chambers in order (1, 2, 3) of their flame frontal area (1 = highest) when the mass fraction burned is about 0.2 and the piston is at TC.


(c) Given this relative flame front area ranking, discuss whether the ranking by mass burning rate dmddt will be different from the flame area ranking.


(d) Briefly discuss the knock implications of these three chamber designs. Which is likely to have the worst knock problem?



Jan 05, 2022
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