Which type of fuel nozzle is most widely used in present-day engines?

The most widely used fuel nozzle in present-day engines is the duplex nozzle. This type of nozzle features two fuel passages, which helps in achieving better atomization of fuel and improved combustion efficiency. Duplex nozzles are preferred in many modern turbine engines due to their ability to effectively meet the varying demands of different operating conditions, such as changes in power output and environmental factors.

Duplex nozzles also facilitate a more stable fuel spray pattern, which enhances the mixing of fuel and air in the combustion chamber, leading to more efficient fuel usage and reduced emissions. This efficiency is crucial for meeting stringent environmental regulations and optimizing overall engine performance.

While other nozzle types like single-point, multi-hole, and swirl atomizers have their applications, they do not offer the same level of versatility and performance enhancements found in duplex nozzles in current aeronautical applications. Thus, the duplex nozzle stands out as the most widely utilized in modern aviation engines.