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What is the scavenging efficiency for the perfect mixing if the delivery ratio is 1.5?(a) 80.73%(b) 81.73%(c) 82.73%(d) 84.73%I had been asked this question in an interview.I'm obligated to ask this question of 2 Stroke Engines in division Internal Combustion Engines of Automobile Engineering

Answer»

Correct choice is (b) 81.73%

To EXPLAIN I WOULD say: DELIVERY ratio = R = 1.7 and scavenging efficiency = ηsc. The relation between the R and ηsc is ηsc = 1 – e^-R= 1 – e^-1.7 = 1 – 0.1826 = 0.8173 = 81.73%. In perfect mixing, the incoming fresh charge mixes completely and instantaneously with the cylinder contents. A portion which is MIXED gets passed out at a rate EQUAL to that of charge entering the cylinder.



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