Effects of shock strength, confinement, and geometric perturbations on shock boundary layer interactions
Abstract/Contents
- Abstract
- Shock boundary layer interactions (SBLIs) occur in many supersonic flows, including supersonic combustion ramjet (scramjet) engines. The successful operation of a scramjet depends on a series of oblique shock waves in the inlet and isolator sections that set up the correct supersonic conditions at the inlet to the combustor. The blockage associated with shock induced boundary layer separation can initiate unstart, a common failure mode for these engines. This Ph.D. thesis describes the effects of confinement and shock strength on three-dimensional SBLI flows in low aspect ratio ducts. SBLIs are generated in two test geometries using sub-boundary layer height compression ramps and investigated using particle image velocimetry (PIV) measurements. The two cases show significant qualitative and quantitative differences, including regular vs. Mach reflection of the incident shock and the size and strength of boundary layer separation. The sensitivity of the SBLI features to many different small perturbations in the inlet boundary conditions is also documented. Small perturbations placed in a sensitive region cause large changes in the downstream flow, whereas the flow is insensitive even to larger perturbations outside this region. Quantitative metrics for comparison of the different flow fields are developed. The datasets are well suited to CFD validation. A new framework for approximately quantifying biases in PIV measurements of high speed compressible flows is established, and its utility for performing validation of CFD results using PIV data is demonstrated.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2014 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Campo, Laura M |
|---|---|
| Associated with | Stanford University, Department of Mechanical Engineering. |
| Primary advisor | Eaton, John K |
| Thesis advisor | Eaton, John K |
| Thesis advisor | Cappelli, Mark A. (Mark Antony) |
| Thesis advisor | Iaccarino, Gianluca |
| Advisor | Cappelli, Mark A. (Mark Antony) |
| Advisor | Iaccarino, Gianluca |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Laura M. Campo. |
|---|---|
| Note | Submitted to the Department of Mechanical Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2014. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2014 by Laura Michelle Campo
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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