 | Kaplan B. Design of an advanced fan stage with ultra high bypass rario and comparison with experimental results: Diss. … Dr.-Ing. / Raumfahrt Institut für Antriebstechnik, Köln. - Köln: DLR, Bibliotheks- und Informationswesen. - 2010. - xiv, 118 p.: ill., graph. - (Forschungsbericht; 10-20). - ISSN 1434-8454
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Nomenclature ................................................. xiii
1 Introduction ................................................. 1
1.1 Motivation .............................................. 1
1.2 Aircraft noise .......................................... 2
1.3 Engine noise and emissions .............................. 2
1.4 BPR as a Design Criteria ................................ 4
1.5 Noise as a design criteria .............................. 6
1.6 Noise Reduction at the Source ........................... 7
1.6.1 Blade Speed and Loading .......................... 7
1.6.2 Blade Shape ...................................... 9
1.6.3 Rotor-Stator Interaction ......................... 9
1.7 State-of-the-art technology ............................ 13
1.8 Objective of this study ................................ 14
2 An Ultra-high Bypass Fan Stage .............................. 17
2.1 Aerodynamic Requirements ............................... 17
2.2 Aeroacoustic Features .................................. 18
2.3 Aerodynamic Design Process ............................. 19
2.3.1 Design Tools .................................... 21
2.3.2 Design Constraints .............................. 25
2.3.3 Flowpath Design ................................. 25
2.3.4 Fan Rotor Design ................................ 28
2.3.5 Impact of S-shaped Rotor Leading Edge on Shock
Structure ....................................... 40
2.3.6 IGV1 Design ..................................... 42
2.3.7 OGV Design ...................................... 46
2.3.8 IGV2 Design ..................................... 47
2.3.9 Conclusion of the aerodynamic design ............ 48
2.4 Overall Results - Operating Map with Computations and
Experiments ............................................ 48
2.4.1 Operating Map Computations and Fan Rotor
Characteristics ................................. 48
2.4.2 Test Rig Facility and Experimental
Instrumentation ................................. 50
2.4.3 Aerodynamic Performance Test Results and
Comparison with CFD ............................. 51
3 DLR's Fan Stage ............................................. 53
3.1 Entire Fan Concept and Flowpath Design ................. 53
3.2 Rotor Design ........................................... 53
3.2.1 Aerodynamic Design .............................. 53
3.2.2 Aeromechanical Design ........................... 54
3.3 OGV Design ............................................. 57
3.4 Overall Results - Operating Map with Computations and
Experiments ............................................ 58
3.4.1 Test Rig Facility and Experimental
Instrumentation ................................. 58
3.4.2 Aerodynamic Performance Test Results and
Comparison with CFD ............................. 59
4 Conclusion .................................................. 63
Appendix ....................................................... 68
A MISES Computations ........................................... 69
В UHBR Fan Rotor Design History ................................ 73
С UHBR Fan IGV1 Design History ................................. 87
D UHBR Fan OGV Design History .................................. 93
E UHBR Fan - Computational and Experimental Results ............ 97
F DLR Fan Rotor Design ........................................ 105
G DLR's Fan OGV Design ....................................... 107
H DLR's Fan - Computational and Experimental Results .......... 111
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