Sökning: "geared turbofan"
Visar resultat 1 - 5 av 6 avhandlingar innehållade orden geared turbofan.
1. Towards Environmentally Friendly Aero Engines
Sammanfattning : Since the introduction of subsonic jet driven commercial aircraft, incremental improvements in overall efficiency has been a driving requirement as well as a selling argument for the engine industry. The historical overall efficiency improvement is the result of continuous advances in aerodynamic design, increase of overall pressure ratios, turbine inlet temperatures and propulsive efficiencies in parallel with the development of stronger and lighter materials. LÄS MER
2. Analysis of concepts to reduce the environmental impact of aviation
Sammanfattning : The average yearly increase in passenger kilometres travelled by air has been 5.8 % over the last 40 years. Fortunately the fuel consumption has not increased at the same rate. Over the same time period the average increase in fuel sold has been 2. LÄS MER
3. Aviation and the Environment- Evaluation of High Propulsive Efficiency Engines
Sammanfattning : There has been more than a tenfold increase in passenger kilometers traveled over the last 40 years. The highest rate of growth today is in developing countries such as China and India. These countries also have the two largest populations in the world. LÄS MER
4. Conceptual Design of Propulsion Systems for Boundary Layer Ingestion
Sammanfattning : To reduce the climate impact of aviation new aircraft and engine concepts as well as improved design methods are needed. In this thesis, two fronts are explored. The first concerns improved methods for the conceptual design of the engine. LÄS MER
5. Experimental Aero Study on Turbine Rear Structures at Engine-Realistic Flow Conditions
Sammanfattning : The aviation industry has made great progress in continuous improvements that reduce the key pollutants associated with aero engines. However, high demands on the aviation industry drive manufacturers and designers to develop even more efficient aero engines. LÄS MER