The engine operating at the conditions in Example Problem 4 has a combustion efficiency of 97%. Calculate: (a) Rate of unburned hydrocarbon fuel that is expelled into the exhaust system. [kg/hr] (b)...

The engine operating at the conditions in Example Problem 4 has a combustion efficiency of 97%. Calculate:

(a) Rate of unburned hydrocarbon fuel that is expelled into the exhaust system. [kg/hr]

(b) Specific emission of HC. [(gm/kW-hr]

(c) Emission index of HC.

Example Problem 4

The diesel engine has a compression ratio of 18:1 and operates on an air-standard Dual cycle. At 2400 RPM, combustion starts at 7° bTDC and lasts for 42° of engine rotation. The ratio of connecting rod length to crank offset is Calculate:

1. ignition delay

2. cycle cut-off ratio

(1) Combustion starts at 7° bTDC and fuel injection starts at 20° bTDC. Ignition delay in degrees of engine rotation is

Ignition delay in seconds is

(2) Combustion stops at 35° aTDC. Cut-off ratio is