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A turbocharged 6.4-liter V8 SI engine operates on an air-standard Otto cycle at WOT with an engine speed of 5500 RPM The compression

A turbocharged, 6.4-liter, V8 SI engine operates on an air-standard Otto cycle at WOT with an engine speed of 5500 RPM. The compression ratio is Te10.4:1, and condi- tions in the cylinders at the start of compression are 65°C and 120 kPa. Crevice volume is equal to 2.8% of clearance volume and has pressure equal to cylinder pressure and temperature equal to 185°C Calculate: (a) Total engine crevice volume. [cm31 (b) Percent of fuel that is trapped in the crevice volume at the start of com- bustion at TDC. [96] The engine in Problem 9-9 has a volumetric efficiency of 89% and uses isooctane as fuel at an air-fuel ratio AF 14.2. Sixty percent of the fuel that is trapped in the crevice volume at the start of combustion is later burned due to additional cylinder motion. Calculate: (a) HC emissions in the exhaust due to the 40% of crevice volume fuel that does not get burned. [kg/hr] (b) Chemical power lost in these HC emissions of the exhaust. [kW] A turbocharged, 6.4-liter, V8 SI engine operates on an air-standard Otto cycle at WOT with an engine speed of 5500 RPM. The compression ratio is Te10.4:1, and condi- tions in the cylinders at the start of compression are 65°C and 120 kPa. Crevice volume is equal to 2.8% of clearance volume and has pressure equal to cylinder pressure and temperature equal to 185°C Calculate: (a) Total engine crevice volume. [cm31 (b) Percent of fuel that is trapped in the crevice volume at the start of com- bustion at TDC. [96] The engine in Problem 9-9 has a volumetric efficiency of 89% and uses isooctane as fuel at an air-fuel ratio AF 14.2. Sixty percent of the fuel that is trapped in the crevice volume at the start of combustion is later burned due to additional cylinder motion. Calculate: (a) HC emissions in the exhaust due to the 40% of crevice volume fuel that does not get burned. [kg/hr] (b) Chemical power lost in these HC emissions of the exhaust. [kW]

Apr 27 2020 View more View Less

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