What do pre swirl vanes in combustion liners primarily improve?

Pre swirl vanes in combustion liners primarily improve the better atomization of the fuel/air mixture. These vanes are strategically placed to direct the airflow into the combustion chamber at an angle that enhances the mixing of fuel and air. By accelerating and swirling the incoming air, the vanes help to create a more homogenous mixture, which is essential for efficient combustion.

Enhanced atomization is crucial for several reasons. It leads to more complete and efficient fuel combustion, which can reduce emissions and increase overall engine performance. The improved mixing also helps maintain stable combustion conditions under varying loads and operating scenarios. This efficiency is key to achieving optimal power output and fuel consumption, making the design of pre swirl vanes an important aspect of turbine engine performance.

Other choices do not align with the primary functions of pre swirl vanes, as they do not directly contribute to fuel safety, engine weight, or combustor temperature regulation in the same manner.