High-fidelity simulation of dynamic stall on helicopter rotors:
Gespeichert in:
| 1. Verfasser: | |
|---|---|
| Format: | Abschlussarbeit Buch |
| Sprache: | English |
| Veröffentlicht: |
München
Verlag Dr. Hut
2021
|
| Ausgabe: | 1. Auflage |
| Schlagworte: | |
| Online-Zugang: | Inhaltstext http://www.dr.hut-verlag.de/978-3-8439-4790-9.html Inhaltsverzeichnis |
| Beschreibung: | Literaturverzeichnis: Seite 131-148 |
| Beschreibung: | xv, 149 Seiten Illustrationen, Diagramme 21 cm x 14.8 cm |
| ISBN: | 9783843947909 3843947902 |
Internformat
MARC
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| 245 | 1 | 0 | |a High-fidelity simulation of dynamic stall on helicopter rotors |c by Johannes Letzgus |
| 250 | |a 1. Auflage | ||
| 264 | 1 | |a München |b Verlag Dr. Hut |c 2021 | |
| 300 | |a xv, 149 Seiten |b Illustrationen, Diagramme |c 21 cm x 14.8 cm | ||
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| 338 | |b nc |2 rdacarrier | ||
| 500 | |a Literaturverzeichnis: Seite 131-148 | ||
| 502 | |b Dissertation |c University of Stuttgart |d 2021 | ||
| 546 | |a Zusammenfassung in deutscher und englischer Sprache | ||
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| 653 | |a Dynamic Stall | ||
| 653 | |a Helicopter Rotor Blade | ||
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Datensatz im Suchindex
| _version_ | 1804182838331834368 |
|---|---|
| adam_text | Contents
Abstract vü
Kurzfassung ix
Notation xi
1 Introduction 1
1 1 State of the Arto ee 3
L11 Experimental Investigation of Dynamic Stall 2 00 3
112 Dynamic Stall Control 0 6 es 6
113 Lower-Order Modeling of Dynamic Stall 0 7 6
114 CFD Simulation of Dynamic Stall 0 ee ee 7
1 2 Objectives ofthe Thesis 2 cr een nen 12
13 Outline Cs onen een 14
2 Fundamentals 15
2 4 Airfoil Aecrodynamics 222er e een nennen 15
2 2 Boundary-Layer Flow and Separation ren eneenne 16
2 3 Helicopter Aerodynamies 2 eee 18
2 4 Dynamic Stall ee eee 20
3 Numerical Methods 23
3 1 Governing Equations 2 Hrn ereeenerenn nen 23
ii
3 2 Turbulence Modeling 2 enne 24
3 3 Detached-Eddy Simulation 222 20 0 om nenn 25
3 4 Flow Solver FLOWer 2 22 22cm nennen nee 28
Pre-Studies of Parameters Influencing
Dynamic Stall and Rotor Aerodynamics 29
4 1 Numerical Setup 0 Deren 29
4 2 Pitching Motion and Mach Number 2 2 222er 30
43 Wind Tunnel Environment 2 none ee 32
4 4 Chapter Conchusions 2 2222 ee 35
Simulation of Dynamic Stall on a Model Rotor in Axial Inflow 37
5 1 Setups and Flow Condition 22-2 n ern e 37
5 11 Experimental Setup 2 2222 ee 37
512 Numerical Setup: FLOWer ee 39
513 Numerical Sctup: TAU 2 2 ee 42
514 Flow Conditions and Pitching Motion 2 2 22 43
5 2) Numerical Results 00 0 ee ee 43
521 Static Hover Case ees 43
522 Dynamic Stall Case ee ee dd
5 3 Cycle-to-Cycle Variations in Experiment 2000 eee 58
5 4 Chapter Conclusions 2 0 63
Assessment and Improvement of Delayed Detached-Eddy Simula-
tions (DDES) of Rotor Dynamic Stall 65
6 1 Modifications to the DDES Shielding Function fy to Prevent Grid-
Induced Separation 2 ee ees 65
6 1 1 Increase of Empirical Constant Cy 66
612 Bernoulli-Based Boundary-Layer Shielding (BDES) 66
613 Vortieity-Integrated Algebraie DES (VIADES) 67
614 Shielding Based on Eddy-Viscosity Gradient (ZDES19) 70
6 2 Application of Alternative Shieldings to Medel-Rotor DS (RTG Case) 71
6 3 Shortcomings of VIADES and BDES in Case of Rotational Inflows 75
6 4 Wall-Normal Flow Analysis Shielding (WNFA) 77
6-41 Algorithin oE WNFA Shielding 2 22 20 77
642 Assessment of Other Boundary-Layer- or Shear-Layer-Edge
Detection Methods 2 u nennen nennen 88
643 Concluding Remarks on the Wall-Normal Flow Analysis
Shielding (WNFA) Approach 2 2 eenen 90
6 5 Application of Alternative Shieldings to Helicopter Rotor DS (Blue-
copter Case) 6 ee 91
6 6 Gray-Avea Mitigation 0 ee 95
661 Application of Alternative Filter Width Asia to Model-Rotor
Dynamic Stall (RTG Case) 6 0 es 96
662 Application of Alternative Filter Width Agia to
Helicopter Rotor Dynamic Stall (Bluecopter Case) « 99
6 7 Chapter Conclusions 2 0 es 102
Simulation of Dynamic Stall on a Rotor in High-Speed Turn Flight 105
7 1 Plight-Test Case 6 0 es 105
7 2 Numerical Approach 660 ee 106
72 1 CFD Setup eee eens 107
722 CSD and Trim: CAMRAD ID «2 ee ee 110
7 2 3 Investigated Target Rotor Thrusts 22 2220 110
7 3 Numerical Results 2222 ven ernennen rennen 111
731 Analysis of Dynamic Stall and Flow Separation 112
732 Influence of Blastie Twist 2 222er 117
7 33 Influence of Turbulence Model 2 2 22 en0a 118
734 Influence of Hub and Fuselage Modeling 2 2 119
7 35 Rotor Trim 2 220 ee 120
736 Measured and Computed Pitch-Link Loads 2 122
7 4 Chapter Conclusions 2 ee 124
8 Conclusion and Outlook 127
References 131
Curriculum Vitae 149
|
| adam_txt |
Contents
Abstract vü
Kurzfassung ix
Notation xi
1 Introduction 1
1 1 State of the Arto ee 3
L11 Experimental Investigation of Dynamic Stall 2 00 3
112 Dynamic Stall Control 0 6 es 6
113 Lower-Order Modeling of Dynamic Stall 0 7 6
114 CFD Simulation of Dynamic Stall 0 ee ee 7
1 2 Objectives ofthe Thesis 2 cr een nen 12
13 Outline Cs onen een 14
2 Fundamentals 15
2 4 Airfoil Aecrodynamics 222er e een nennen 15
2 2 Boundary-Layer Flow and Separation ren eneenne 16
2 3 Helicopter Aerodynamies 2 eee 18
2 4 Dynamic Stall ee eee 20
3 Numerical Methods 23
3 1 Governing Equations 2 Hrn ereeenerenn nen 23
ii
3 2 Turbulence Modeling 2 enne 24
3 3 Detached-Eddy Simulation 222 20 0 om nenn 25
3 4 Flow Solver FLOWer 2 22 22cm nennen nee 28
Pre-Studies of Parameters Influencing
Dynamic Stall and Rotor Aerodynamics 29
4 1 Numerical Setup 0 Deren 29
4 2 Pitching Motion and Mach Number 2 2 222er 30
43 Wind Tunnel Environment 2 none ee 32
4 4 Chapter Conchusions 2 2222 ee 35
Simulation of Dynamic Stall on a Model Rotor in Axial Inflow 37
5 1 Setups and Flow Condition 22-2 n ern e 37
5 11 Experimental Setup 2 2222 ee 37
512 Numerical Setup: FLOWer ee 39
513 Numerical Sctup: TAU 2 2 ee 42
514 Flow Conditions and Pitching Motion 2 2 22 43
5 2) Numerical Results 00 0 ee ee 43
521 Static Hover Case ees 43
522 Dynamic Stall Case ee ee dd
5 3 Cycle-to-Cycle Variations in Experiment 2000 eee 58
5 4 Chapter Conclusions 2 0 63
Assessment and Improvement of Delayed Detached-Eddy Simula-
tions (DDES) of Rotor Dynamic Stall 65
6 1 Modifications to the DDES Shielding Function fy to Prevent Grid-
Induced Separation 2 ee ees 65
6 1 1 Increase of Empirical Constant Cy 66
612 Bernoulli-Based Boundary-Layer Shielding (BDES) 66
613 Vortieity-Integrated Algebraie DES (VIADES) 67
614 Shielding Based on Eddy-Viscosity Gradient (ZDES19) 70
6 2 Application of Alternative Shieldings to Medel-Rotor DS (RTG Case) 71
6 3 Shortcomings of VIADES and BDES in Case of Rotational Inflows 75
6 4 Wall-Normal Flow Analysis Shielding (WNFA) 77
6-41 Algorithin oE WNFA Shielding 2 22 20 77
642 Assessment of Other Boundary-Layer- or Shear-Layer-Edge
Detection Methods 2 u nennen nennen 88
643 Concluding Remarks on the Wall-Normal Flow Analysis
Shielding (WNFA) Approach 2 2 eenen 90
6 5 Application of Alternative Shieldings to Helicopter Rotor DS (Blue-
copter Case) 6 ee 91
6 6 Gray-Avea Mitigation 0 ee 95
661 Application of Alternative Filter Width Asia to Model-Rotor
Dynamic Stall (RTG Case) 6 0 es 96
662 Application of Alternative Filter Width Agia to
Helicopter Rotor Dynamic Stall (Bluecopter Case) « 99
6 7 Chapter Conclusions 2 0 es 102
Simulation of Dynamic Stall on a Rotor in High-Speed Turn Flight 105
7 1 Plight-Test Case 6 0 es 105
7 2 Numerical Approach 660 ee 106
72 1 CFD Setup eee eens 107
722 CSD and Trim: CAMRAD ID «2 ee ee 110
7 2 3 Investigated Target Rotor Thrusts 22 2220 110
7 3 Numerical Results 2222 ven ernennen rennen 111
731 Analysis of Dynamic Stall and Flow Separation 112
732 Influence of Blastie Twist 2 222er 117
7 33 Influence of Turbulence Model 2 2 22 en0a 118
734 Influence of Hub and Fuselage Modeling 2 2 119
7 35 Rotor Trim 2 220 ee 120
736 Measured and Computed Pitch-Link Loads 2 122
7 4 Chapter Conclusions 2 ee 124
8 Conclusion and Outlook 127
References 131
Curriculum Vitae 149 |
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| author | Letzgus, Johannes 1987- |
| author_GND | (DE-588)1235963918 |
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| ctrlnum | (OCoLC)1257489033 (DE-599)DNB1235089223 |
| discipline | Physik Verkehr / Transport |
| discipline_str_mv | Physik Verkehr / Transport |
| edition | 1. Auflage |
| format | Thesis Book |
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| spelling | Letzgus, Johannes 1987- Verfasser (DE-588)1235963918 aut High-fidelity simulation of dynamic stall on helicopter rotors by Johannes Letzgus 1. Auflage München Verlag Dr. Hut 2021 xv, 149 Seiten Illustrationen, Diagramme 21 cm x 14.8 cm txt rdacontent n rdamedia nc rdacarrier Literaturverzeichnis: Seite 131-148 Dissertation University of Stuttgart 2021 Zusammenfassung in deutscher und englischer Sprache Instationäre Strömung (DE-588)4132734-2 gnd rswk-swf Grenzschichtablösung (DE-588)4136915-4 gnd rswk-swf Hubschrauberrotor (DE-588)4160722-3 gnd rswk-swf Dynamic Stall Helicopter Rotor Blade Computational Fluid Dynamics (CFD) (DE-588)4113937-9 Hochschulschrift gnd-content Hubschrauberrotor (DE-588)4160722-3 s Instationäre Strömung (DE-588)4132734-2 s Grenzschichtablösung (DE-588)4136915-4 s DE-604 Verlag Dr. Hut (München) (DE-588)10174118-2 pbl X:MVB text/html http://deposit.dnb.de/cgi-bin/dokserv?id=93db09f8121b48a597fdf2ceef81bef2&prov=M&dok_var=1&dok_ext=htm Inhaltstext X:MVB http://www.dr.hut-verlag.de/978-3-8439-4790-9.html HEBIS Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=032905091&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis 1\p vlb 20210609 DE-101 https://d-nb.info/provenance/plan#vlb |
| spellingShingle | Letzgus, Johannes 1987- High-fidelity simulation of dynamic stall on helicopter rotors Instationäre Strömung (DE-588)4132734-2 gnd Grenzschichtablösung (DE-588)4136915-4 gnd Hubschrauberrotor (DE-588)4160722-3 gnd |
| subject_GND | (DE-588)4132734-2 (DE-588)4136915-4 (DE-588)4160722-3 (DE-588)4113937-9 |
| title | High-fidelity simulation of dynamic stall on helicopter rotors |
| title_auth | High-fidelity simulation of dynamic stall on helicopter rotors |
| title_exact_search | High-fidelity simulation of dynamic stall on helicopter rotors |
| title_exact_search_txtP | High-fidelity simulation of dynamic stall on helicopter rotors |
| title_full | High-fidelity simulation of dynamic stall on helicopter rotors by Johannes Letzgus |
| title_fullStr | High-fidelity simulation of dynamic stall on helicopter rotors by Johannes Letzgus |
| title_full_unstemmed | High-fidelity simulation of dynamic stall on helicopter rotors by Johannes Letzgus |
| title_short | High-fidelity simulation of dynamic stall on helicopter rotors |
| title_sort | high fidelity simulation of dynamic stall on helicopter rotors |
| topic | Instationäre Strömung (DE-588)4132734-2 gnd Grenzschichtablösung (DE-588)4136915-4 gnd Hubschrauberrotor (DE-588)4160722-3 gnd |
| topic_facet | Instationäre Strömung Grenzschichtablösung Hubschrauberrotor Hochschulschrift |
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| work_keys_str_mv | AT letzgusjohannes highfidelitysimulationofdynamicstallonhelicopterrotors AT verlagdrhutmunchen highfidelitysimulationofdynamicstallonhelicopterrotors |