声明
摘要
Abstract
Table of Contents
1 Introduction
1．1 Classification of Propulsion Systems
1．2 Solid Rocket Motors
1．2．1 Basic Layout of a Solid Rocket Motor
1．2．2 Basic Theory
1．2．3 Drawbacks and Technical Solutions
1．3 Dual Pulse Solid Rocket Motors
1．4 Literatu re Review
1．5 Thesis Organization
2 Preliminary Design of a DPM
2．1 Major Components Design
2．1．1 The Case
2．1．2 The Nozzle
2．1．3 The Propellant Grain
2．1．4 The Igniter
2．1．5 The Thermal Insulation
2．2 Important Definitions
2．2．1 Specific Impulse and Related Parameters
2．2．2 Equilibrium Pressure
2．3 The Preliminary Design Approach
2．3．1 Ballistic Calculations
2．3．2 Motor Case
2．3．3 Forward Closure
2．3．5 Modulated Dual pulse Rocket Motor Concept
2．4 Summary
3 Mathematical and Physical Foundations
3．1 Governing Equations
3．1．1 The Navier-Stokes Equations
3．1．2 Turbulence Model
3．2 Numerical Solution of the Governing Equations
3．2．1 Discretization Techniques
3．2．2 Overview of Flow Solving Approaches
3．3 ANSYS Fluent Solver
3．4 Summary
4 Numerical Simulation
4．1 Computational Model and Boundary Conditions
4．1．1 Considered Parameters
4．1．2 Boundary Conditions
4．2 Pro-processing Stage
4．2．1 Brief Description of the Meshing Software(ANSYS ICEM CFD)
4．2．2 Mesh Generation
4．2．3 Resulting Mesh
4．3 Processing Stage
4．4 Post-processing Stage
4．5 Summary
5 Results and Discussions
5．1 Nozzle Flow Analysis
5．2 First Pulse Simulations
5．3 Second Pulse Simulations
5．3．1 Pressure distribution analysis
5．3．2 Streamlines Evolution Analysis
5．3．3 Turbulence Kinetic Energy Analysis
5．3．4 Axial Velocity Profiles Analysis
5．3．5 Axial Wall Shear Stress Analysis
5．4 Summary
6 Conclusion and Future Prospects
Acknowledgements
References
