Why are modern jet engines so big?

Question

To increase their jet efficiency
To increase the ratio air/fuel
To make them more powerful
To provide space for their ever more complex components

Answer 1

All of the given reasons contribute to why modern jet engines are relatively large.

1. To increase jet efficiency: Larger engines can generate more thrust, which improves the overall efficiency of the aircraft. By producing more thrust with a larger engine, the aircraft can achieve higher speeds and carry heavier loads.

2. To increase the ratio of air/fuel: Larger engines have larger combustion chambers, allowing for a higher volume of air and fuel to be mixed and burned. This increases the combustion efficiency and provides more power to generate thrust.

3. To make them more powerful: As mentioned earlier, larger engines can produce more thrust, which results in greater power. This is essential for commercial airliners, military aircraft, and other applications where high power output is required.

4. To provide space for complex components: Modern jet engines incorporate various advanced technologies and complex systems to enhance performance, safety, and reliability. These components may include advanced compressors, turbines, fuel systems, cooling systems, and exhaust systems. The larger size of the engine allows for proper placement and accommodation of these complex components.

Overall, the increased size of modern jet engines is a result of the need for improved efficiency, increased power, and the inclusion of technologically advanced components.