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.
Phosphate treatment
Plastic media blasting
Powder metal (PM) components
Pollutants
Precipitation hardening
Pressure ratio
Principle of energy transfer
Propfan
Propulsion efficiency
Pollutants
Aero engines - just like any other combustion engine - emit pollutants. The combustion of kerosene in the engine produces nitrogen oxides (NOx), unburned hydrocarbons (UHC), carbon monoxide (CO) and carbon dioxide (CO2). Pollutant emissions can be reduced by the use low-emission combustion chambers, by increasing component efficiencies and the thermal efficiency and by optimizing the propulsion efficiency through new propulsion concepts.
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