Glossary

What are transonic airfoils, and what is the active clearance control? Check out our technical dictionary and find out more about engine technology terms – from active clearance control to velocity triangle.

Black-oxidizing Blade force Blade load Bling Blisk Broaching Brush seals Bypass ratio

Bypass ratio

With commercial engines the ratio between cold and hot airflow is very high. A bypass ratio of 6:1, for example, means that the air volume flowing through the fan and bypassing the core engine is six times the air volume flowing through the core engine.