What is true regarding the accumulation of contaminants in the compressor of a turbojet engine?

Accumulation of contaminants in the compressor of a turbojet engine leads to a reduction in the aerodynamic efficiency of the blades. When foreign materials, such as dirt, sand, or ice, build up on the compressor blades, they disrupt the smooth airflow that is essential for optimal performance. This disturbance alters the blade profile and can create drag, which ultimately decreases the engine’s ability to compress air effectively. As a result, the overall efficiency of the compressor is compromised, leading to potentially reduced performance across various engine operating conditions.

While it's true that a reduction in aerodynamic efficiency can also impact other aspects, such as fuel consumption and overall engine power output, the primary direct effect of contaminants is on the blades' ability to maintain efficient airflow and compress air as designed. The other options suggest improvements or changes that would not occur as a result of contaminants; instead, they would exacerbate the issues related to engine performance.