4. For a two-stroke diesel engine, the charging efficiency can be estimated from measurement of the...

 

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4. For a two-stroke diesel engine, the charging efficiency can be estimated from measurement of the CO2 and O2 concentration in the burned gases within the cylinder, or in exhaust blow-down pulse prior to any mixing with the fresh air. For an engine with Bore = 125 mm, Stroke = 150 mm, compression ratio = 15 running at 1800 rpm, these values on dry basis (after H₂O removal) were CO₂ = 7.2 % and O₂ = 10.4 %. If the measured supplied fuel flow rate was 1.6 g/s and air flow rate for scavenging was 80 g/s, evaluate: a. The charging (scavenging) efficiency b. The delivery ratio The trapping efficiency (assuming trapped mass = reference mass) The conditions for evaluating reference mass or density are 300 K and 1 atm. 4. For a two-stroke diesel engine, the charging efficiency can be estimated from measurement of the CO2 and O2 concentration in the burned gases within the cylinder, or in exhaust blow-down pulse prior to any mixing with the fresh air. For an engine with Bore = 125 mm, Stroke = 150 mm, compression ratio = 15 running at 1800 rpm, these values on dry basis (after H₂O removal) were CO₂ = 7.2 % and O₂ = 10.4 %. If the measured supplied fuel flow rate was 1.6 g/s and air flow rate for scavenging was 80 g/s, evaluate: a. The charging (scavenging) efficiency b. The delivery ratio The trapping efficiency (assuming trapped mass = reference mass) The conditions for evaluating reference mass or density are 300 K and 1 atm.

Answer rating: 100% (QA)

a The charging efficiency is the ratio of the actual quantity of air delivered to the cylinder to th... View the full answer