A spark ignition engine operates on the air-standard Otto cycle. Air is induced at 1 bar and 30 oC and attains a temperature of 1600 oC after heat addition. If the compression ratio is 9 to 1. Sketch the p-v and T-s diagrams for the Otto cycle and calculate the cycle thermal efficiency.

ces ! Required information A four-cylinder, four-stroke, spark-ignition engine operates on the ideal Otto cycle with a compression ratio of 11 and a total displacement volume of 1.8 L. The air is at 90 kPa and 50°C at the beginning of the compression process. The heat input is 1.1 kJ per cycle per cylinder. The gas constant of air is R = 0.287 kJ/kg-K and use constant specific heats with cv=0.821 kJ/kg-K, cp = 1.108 kJ/kg-K, and k= 1.35. Determine the maximum temperature and pressure that occur during the cycle. (You must provide an answer before moving on to the next part.) The maximum temperature during the cycle is The maximum pressure during the cycle is K. kPa.

Discuss the dependency of the thermal efficiency of the ideal Otto cycle on compression ratio and engine knock.

An ideal, air-standard Diesel cycle has a compression ratio of 20. The maximum temperature is 2200 K while the air is 320 K and at 105 kPa before compression. Assume that specific heats vary with temperature. Select all appropriate assumptions   Question 1 options:   Non-ideal gas.   Ideal gas   Steady flow   Unsteady flow   Adiabatic   Stationary   Include of kinetic and potential energy   No work   Isobaric   Isothermal   Isochoric   Isentropic   Exact analysis   Approximate analysis   Open system   Closed system   Air-Standard   Cold-Air-Standard