 | Kobald M. Combustion phenomena of advanced hybrid rocket fuels: Diss. ... Dr.-Ing. / Deutsches Zentrum für Luft- und Raumfahrt, Institut für Raumfahrtantriebe, Lampoldshausen. - Köln: DLR, 2016. - xxiii, 121 p.: ill., tab. - (Forschungsbericht; 2016-02). - Res. also Germ. - Bibliogr.: p.101-114.
Шифр: (Pr 1120/2016-02) 02
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Abstract ....................................................... ix
Kurzfassung ..................................................... x
List of Figures .............................................. xiii
List of Tables ............................................... xvii
List of Abbreviations ......................................... xix
1 Introduction ................................................. 1
1.1 A Short History of Rocket Propulsion and Space Flight ... 1
1.2 Hybrid Rocket Engines ................................... 2
1.3 Liquefying Hybrid Rocket Fuels .......................... 5
1.4 Optical Investigations of Hybrid Rocket Combustion ...... 9
1.5 An Historical Overview about Tests at the DLR
Lampoldshausen ......................................... 11
1.6 Heterogeneous Combustion ............................... 13
1.7 Structure of this Thesis ............................... 16
2 Theory ...................................................... 17
2.1 Regression Rate Developments ........................... 17
2.1.1 Influence of Injection on the Regression Rate ... 20
2.1.2 Measurement Principles .......................... 20
2.2 Thermodynamics During Combustion ....................... 23
2.3 Combustion Instabilities ............................... 24
2.4 Kelvin Helmholtz Instability ........................... 28
2.5 Proper Orthogonal Decomposition ........................ 35
2.6 Video Pre-Processing ................................... 36
3 Experiments ................................................. 39
3.1 Investigated Hybrid Rocket Fuels and Additives ......... 39
3.2 Two Experimental Set-Ups ............................... 41
3.3 Measurement Data Acquisition and Test Bench Control
System ................................................. 42
3.4 Viscosity Measurements ................................. 47
3.4.1 Viscosity of Pure Paraffin Samples .............. 48
3.4.2 Viscosity of Paraffin with Additives ............ 49
3.5 Surface Tension Measurements ........................... 52
3.6 Tensile Tests .......................................... 55
4 Results ..................................................... 57
4.1 Combustion Behavior Analyzed by Optical
Investigations ......................................... 57
4.1.1 Ignition Delay .................................. 57
4.1.2 Droplet Entrainment ............................. 57
4.1.3 Fuels with Low Regression Rate .................. 63
4.1.4 Influence of Pre-Combustion Chamber
Configuration ................................... 64
4.1.5 Shadow-Graph Imaging ............................ 64
4.1.6 Schlieren Investigations ........................ 66
4.1.7 Regression Rate Analysis ........................ 69
4.2 Proper Orthogonal Decomposition Analysis ............... 71
4.2.1 Influence of Rearward Facing Step on
Combustion Behavior ............................. 75
4.2.2 Validation and Consistency of the POD Analysis .. 75
4.2.3 Challenges and Limitations of the Optical and
the POD Analysis ................................ 85
4.3 2D Radial Micro Burner Ballistic Tests ................. 87
4.3.1 Regression Rate Measurements .................... 87
4.3.2 Combustion Efficiencies ......................... 92
4.3.3 Combustion Stability ............................ 93
5 Conclusions ................................................. 95
6 Outlook ..................................................... 99
Bibliography .................................................. 101
Publications created during this dissertation ................. 117
Appendix ...................................................... 119
A Sensor and Measurement Device List ....................... 119
В Resume .................................................. 121
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