The fundamental difference in efficiency between the Otto cycle and the Brayton cycle arises from how heat addition occurs during the combustion stage. In an Otto cycle, which powers most spark-ignition internal combustion engines, combustion happens at a constant volume. This means the piston is at the top of its stroke, and the volume of the combustion chamber is fixed while the fuel-air mixture ignites and releases energy. Because the volume is constant, the pressure rises significantly, allowing for high peak pressures and efficient thermal conversion. In contrast, the Brayton cycle, which powers gas turbine....
Log in to view the answer
