What is the relation between compression ratio and efficiency of Otto cycle?

Explanation: This is the expression for efficiency of Otto cycle and rk=compression ratio=Vmax/Vmin.

What is the significance of compression ratio in an IC engine?

The compression ratio is defined as the ratio between the volume of the cylinder with the piston in the bottom position, Vbottom (largest volume), and in the top position, Vtop (smallest volume). The higher this ratio, the greater will be the power output from a given engine.

When the compression ratio is increased the efficiency of the engine cycle will?

Why Compression Ratios Increases Fuel Efficiency “Increase in compression ratio induces greater turning effect on the cylinder crank [6]. That means that the engine is getting more push on the piston, and hence more torque is generated.

What is the formula for the compression ratio of the Otto cycle?

Thermal Efficiency for Otto Cycle The air-standard Otto cycle thermal efficiency is a function of compression ratio and κ = cp/cv. It is a very useful conclusion because it is desirable to achieve a high compression ratio to extract more mechanical energy from a given mass of the air-fuel mixture.

What is the efficiency of compressed charge engine?

An engine of good mechanical design has a mechanical efficiency of around 80–90\% at full load. The overall efficiency of a compression ignition engine depends on the type, but ranges from 30\% to 40\%.

What is the formula for compression ratio R of the Otto cycle?

Thermal Efficiency for Otto Cycle The air-standard Otto cycle thermal efficiency is a function of compression ratio and κ = cp/cv.

How is compression ratio calculated?

Measure the water it took to fill the cylinder with the piston at bottom dead center, and then divide that by the amount of water needed to fill the cylinder with the piston at top dead center. The ratio of the two different volumes is the compression ratio.

What is the formula for expansion ratio?

The dependence of thermal expansion on temperature, substance, and length is summarized in the equation ΔL = αLΔT,where ΔL is the change in length L, ΔT is the change in temperature, and α is the coefficient of linear expansion, which varies slightly with temperature.

Which cycle is the most efficient of these for the same compression ratio a Otto cycle B Diesel cycle?

Explanation: Otto cycle is more efficient than Diesel cycle for a given compression ratio. 6. For constant maximum pressure and heat input, the air standard efficiency of the gas power cycle is in the order.