Numerical investigation of internal flow in hydraulic valves and dynamic interactions in hydraulic systems with CFD and simplified simulation methods:
Saved in:
| Main Author: | |
|---|---|
| Format: | Thesis Book |
| Language: | English |
| Published: |
Aachen
Shaker
2005
|
| Series: | Berichte aus der Strömungstechnik
|
| Subjects: | |
| Online Access: | Inhaltsverzeichnis |
| Physical Description: | XII, 149 S. Ill., graph. Darst. |
| ISBN: | 3832239324 |
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MARC
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| 100 | 1 | |a Chen, Qing |e Verfasser |4 aut | |
| 245 | 1 | 0 | |a Numerical investigation of internal flow in hydraulic valves and dynamic interactions in hydraulic systems with CFD and simplified simulation methods |c Qing Chen |
| 264 | 1 | |a Aachen |b Shaker |c 2005 | |
| 300 | |a XII, 149 S. |b Ill., graph. Darst. | ||
| 336 | |b txt |2 rdacontent | ||
| 337 | |b n |2 rdamedia | ||
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| 490 | 0 | |a Berichte aus der Strömungstechnik | |
| 502 | |b Dissertation |c Technische Universität Darmstadt |d 2005 | ||
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Contents
1 Introduction 1
1 1 Objectives and methods 2
1 2 Structure 4
2 State-of-the-art 5
2 1 Academic overview of the problem 5
211 Dynamic pressure change 5
212 Oscillating and pulsating flow 6
213 Transient flow 7
214 Dynamic performance of the pipe flow 9
215 CFD analysis of flow behavior of hydraulic valves 10
2 2 Simulation tools used in fluid technology 12
221 Simplified modelling techniques 13
222 Structure analysis with FEM 14
223 Flow simulation with the aid of CFD 14
3 Theoretical fundamentals 17
3 1 Simplified simulation methods for oil hydraulic systems 17
311 Model of concentrated parameters 17
3111 Derivation 18
3112 Solution to the system equations 19
312 Distributed parameters 20
3121 Derivation 20
3122 Solution to the system equations in time domain 22
3123 Approach of wall shear stress 27
3124 Optimization of the friction approach 32
313 Transfer matrix method 33
3 2 CFD numerical calculation 35
321 Description of turbulent flow 35
3211 Standard k- s turbulence model 35
3212 RNGk-f turbulence model 36
322 Mixture multiphase model 38
3221 Continuity equation for the mixture 39
3222 Momentum equation for the mixture 39
3223 Energy equation for the mixture 40
3224 Relative (Slip) velocity and the drift velocity 40
3225 Volume fraction equation for the secondary phases 41
323 Dynamic mesh model 41
3231 Dynamic mesh conservation equations 42
3232 Dynamic mesh update methods 43
4 Simulation results of hydraulic systems with simplified modelling methods 47
4 1 n-element concentrated parameter 47
411 32-element concentrated parameter 47
412 Comparison of different elements concentrated parameter 51
4 2 Characteristic method 53
4 3 Comparison of concentrated and distributed parameter 56
4 4 Simulation with transfer matrix method 58
4 5 Comparison of simulations with different simplified methods 60
EX
4 6 Conclusions 63
5 Turbulent flow and cavitation of a pressure relief valve 65
5 1 Turbulent flow 65
511 Valve with complex seat 66
512 Valve with simple seat 68
513 Comparison of simulation results of two simplified configurations 69
5131 Influences of the inlet flow rate 70
5132 Influences of the outlet pressure 71
5 2 Cavitation 74
521 Unsteady cavitation in the valve with complex seat 74
5211 Influences of the inlet flow rate 77
5212 Influences of the outlet pressure 79
5213 Influences of turbulence models 80
522 Cavitation in the valve with simple seat 81
5221 Steady cavitatin 81
5222 Unsteady cavitation 83
523 Influence of gap on cavitation 85
6 Dynamic mesh simulation 89
6 1 Opening process of the valve with simple seat 89
611 Distribution of pressure 90
612 Distribution of velocity 91
6 2 Closing process of the valve with simple seat 92
621 Static pressure 92
622 Velocity magnitude 93
6 3 Cavitation and closing process of the valve 95
631 Constant cone motion velocity 95
6311 Vapor volume fraction 96
6312 Static pressure 97
6313 Velocity 98
632 Sinusoidal cone motion velocity 100
7 Numerical simulation of a 3D servo valve 104
7 1 Geometry and mesh 104
7 2 Laminar flow 106
7 3 Turbulent flow 108
7 4 Cavitation Ill
8 Coupled simulation of whole hydraulic systems 114
8 1 Off-line-coupling 114
8 2 On-line-coupling 118
821 Motivation 118
822 Determination of the coupling modus 119
823 Formulation of boundary conditions 119
824 Predefinition and tests 121
825 Coupling principle 122
826 Coupling results 124
9 Summary and outlook 127
10 Literature 129
X
11 Symbols and abbreviations 136
12 Appendices 141 |
| any_adam_object | 1 |
| author | Chen, Qing |
| author_facet | Chen, Qing |
| author_role | aut |
| author_sort | Chen, Qing |
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| dewey-hundreds | 600 - Technology (Applied sciences) |
| dewey-ones | 620 - Engineering and allied operations |
| dewey-raw | 620 |
| dewey-search | 620 |
| dewey-sort | 3620 |
| dewey-tens | 620 - Engineering and allied operations |
| discipline | Maschinenbau / Maschinenwesen |
| format | Thesis Book |
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| genre_facet | Hochschulschrift |
| id | DE-604.BV024626854 |
| illustrated | Illustrated |
| indexdate | 2025-03-18T13:00:39Z |
| institution | BVB |
| isbn | 3832239324 |
| language | English |
| oai_aleph_id | oai:aleph.bib-bvb.de:BVB01-018598573 |
| oclc_num | 76772840 |
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| owner_facet | DE-83 DE-634 |
| physical | XII, 149 S. Ill., graph. Darst. |
| publishDate | 2005 |
| publishDateSearch | 2005 |
| publishDateSort | 2005 |
| publisher | Shaker |
| record_format | marc |
| series2 | Berichte aus der Strömungstechnik |
| spelling | Chen, Qing Verfasser aut Numerical investigation of internal flow in hydraulic valves and dynamic interactions in hydraulic systems with CFD and simplified simulation methods Qing Chen Aachen Shaker 2005 XII, 149 S. Ill., graph. Darst. txt rdacontent n rdamedia nc rdacarrier Berichte aus der Strömungstechnik Dissertation Technische Universität Darmstadt 2005 Hydraulikanlage (DE-588)4127621-8 gnd rswk-swf Numerische Strömungssimulation (DE-588)4690080-9 gnd rswk-swf (DE-588)4113937-9 Hochschulschrift gnd-content Hydraulikanlage (DE-588)4127621-8 s Numerische Strömungssimulation (DE-588)4690080-9 s DE-604 HEBIS Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=018598573&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Chen, Qing Numerical investigation of internal flow in hydraulic valves and dynamic interactions in hydraulic systems with CFD and simplified simulation methods Hydraulikanlage (DE-588)4127621-8 gnd Numerische Strömungssimulation (DE-588)4690080-9 gnd |
| subject_GND | (DE-588)4127621-8 (DE-588)4690080-9 (DE-588)4113937-9 |
| title | Numerical investigation of internal flow in hydraulic valves and dynamic interactions in hydraulic systems with CFD and simplified simulation methods |
| title_auth | Numerical investigation of internal flow in hydraulic valves and dynamic interactions in hydraulic systems with CFD and simplified simulation methods |
| title_exact_search | Numerical investigation of internal flow in hydraulic valves and dynamic interactions in hydraulic systems with CFD and simplified simulation methods |
| title_full | Numerical investigation of internal flow in hydraulic valves and dynamic interactions in hydraulic systems with CFD and simplified simulation methods Qing Chen |
| title_fullStr | Numerical investigation of internal flow in hydraulic valves and dynamic interactions in hydraulic systems with CFD and simplified simulation methods Qing Chen |
| title_full_unstemmed | Numerical investigation of internal flow in hydraulic valves and dynamic interactions in hydraulic systems with CFD and simplified simulation methods Qing Chen |
| title_short | Numerical investigation of internal flow in hydraulic valves and dynamic interactions in hydraulic systems with CFD and simplified simulation methods |
| title_sort | numerical investigation of internal flow in hydraulic valves and dynamic interactions in hydraulic systems with cfd and simplified simulation methods |
| topic | Hydraulikanlage (DE-588)4127621-8 gnd Numerische Strömungssimulation (DE-588)4690080-9 gnd |
| topic_facet | Hydraulikanlage Numerische Strömungssimulation Hochschulschrift |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=018598573&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
| work_keys_str_mv | AT chenqing numericalinvestigationofinternalflowinhydraulicvalvesanddynamicinteractionsinhydraulicsystemswithcfdandsimplifiedsimulationmethods |