Question

A four-cylinder, four-stroke engine is built into an automobile. Within each cylinder of the engine, the processes can be modeled as an air-standard Otto cycle.

At the beginning of the compression process, the cylinder volume is .559 L.

The temperature and pressure are 330 K and 1.5 bar, respectively. In the cycle, the maximum temperature is 2200 K when the engine operates at 3000 RPM.

(4-stroke engine, 2 rotations per cycle, MW of air = 28.97 kg/kmol)

If the engine compression ratio is 9.5, determine

(a)  the air mass flow rate to the engine in g/s.

(b) the heat addition to the engine in kW.

(c) the net work of the engine in kW.

(d) the thermal efficiency of the engine in %.

(e) the mean effective pressure of the engine in bar.

Answer 1