Let’s examine the engine of a Honda CB1000RR. But first, some idealizations: we will evaluate the engine using an ideal Otto cycle with variable specific heats. At the start of each cycle, air is at 100 kPa and 298 K, and has a gas constant of around 0.287kJ/kg-K. The maximum temperature at the end of heat addition is assumed to be 2200 K. The Honda CB1000RR has a four-stroke I4 spark-ignition (SI) engine: four cylinders, each with 25 cc (or cm3) of maximum volume. Its compression ratio is 10.8. At our preferred condition, the engine runs at 9,000 revolutions per minute, with two cylinders undergoing a power stroke every revolution. a. Sketch the Pressure (kPa) - volume (cc) and Temperature (K) - entropy (s) diagram of the cycle. For entropy, you may leave it as s1, s2, etc. b. Calculate the specific net work (kJ/kg) and the efficiency (%). c. Calculate the mean effective pressure (kPa) and the power produced by the engine (in kW).
Let’s examine the engine of a Honda CB1000RR. But first, some idealizations:
we will evaluate the engine using an ideal Otto cycle with variable specific heats.
At the start of each cycle, air is at 100 kPa and 298 K, and has a gas constant of around 0.287kJ/kg-K.
The maximum temperature at the end of heat addition is assumed to be 2200 K.
The Honda CB1000RR has a four-stroke I4 spark-ignition (SI) engine: four cylinders, each with 25 cc (or cm3) of maximum volume. Its compression ratio is 10.8. At our preferred condition, the engine runs
at 9,000 revolutions per minute, with two cylinders undergoing a power stroke every revolution.
a. Sketch the Pressure (kPa) - volume (cc) and Temperature (K) - entropy (s) diagram of the cycle.
For entropy, you may leave it as s1, s2, etc.
b. Calculate the specific net work (kJ/kg) and the efficiency (%).
c. Calculate the mean effective pressure (kPa) and the power produced by the engine (in kW).
Step by step
Solved in 4 steps with 3 images
