Unsteady propeller hydrodynamics by Dirk H. Renick.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2001.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2005
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| Online Access: | http://hdl.handle.net/1721.1/8710 |
| _version_ | 1811084734614208512 |
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| author | Renick, Dirk Hampton, 1970- |
| author2 | Justin E. Kerwin. |
| author_facet | Justin E. Kerwin. Renick, Dirk Hampton, 1970- |
| author_sort | Renick, Dirk Hampton, 1970- |
| collection | MIT |
| description | Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2001. |
| first_indexed | 2024-09-23T12:56:47Z |
| format | Thesis |
| id | mit-1721.1/8710 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T12:56:47Z |
| publishDate | 2005 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/87102019-04-12T08:57:03Z Unsteady propeller hydrodynamics by Dirk H. Renick. Renick, Dirk Hampton, 1970- Justin E. Kerwin. Massachusetts Institute of Technology. Dept. of Ocean Engineering. Massachusetts Institute of Technology. Dept. of Ocean Engineering. Ocean Engineering. Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2001. Includes bibliographical references (leaves 129-132). One of the main problem affecting modern propulsor design engineers is the ability to quantitatively predict unsteady propeller forces for modern, multi-blade row, ducted propulsors operating in highly contracting flowfields. Current algorithms provide valuable insight into qualitative trendlines for these modern designs. This thesis has focused on the more accurate quantitative force prediction by introducing more physical modeling into the numerical computations, using more accurate analytical representation of continuous physical phenomena, whilst not increasing the usage complexity for the desktop engineer. This thesis developed several novel algorithms and techniques and applied them to build an evolutionary, general vortex-lattice lifting-surface propeller code. First, a general method to track the trajectory of individual wake singularity sheets and compute their influence velocities was evolved which reduces computation time, and dramatically increases the accuracy of the unsteady blade loading problem. To improve the general coupling technique between potential-based propeller codes and volumetric Reynolds-Averaged Navier-Stokes codes, a general analytic method based upon an elliptic integral method for the velocity induced by a vortex ring of unsteady harmonic strength to compute of the time-averaged induced velocities in the swept volume of the propeller was introduced which is more accurate, as demonstrated in model problems, and more robust, as indicated by improved convergence and accuracy in a fully three dimensional propeller code. (cont.) A discretized geometric technique was also created to internalize the coupling routines, making the code more robust, while decreasing the computation burden over currect methods. Finally, a higher order quadratic influence function technique was implemented within the wake to more accurately define the induction velocity at the trailing edge which has suffered in the past due to lack of discretization. These propeller propgram enhancements were fitted into a fully functional version of the Propeller Unsteady Forces (PUF)-series code, and coupled with a three dimensional RANS code. Ph.D. 2005-08-23T22:33:04Z 2005-08-23T22:33:04Z 2001 2001 Thesis http://hdl.handle.net/1721.1/8710 49870145 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 132 leaves 6604131 bytes 6603888 bytes application/pdf application/pdf application/pdf Massachusetts Institute of Technology |
| spellingShingle | Ocean Engineering. Renick, Dirk Hampton, 1970- Unsteady propeller hydrodynamics by Dirk H. Renick. |
| title | Unsteady propeller hydrodynamics by Dirk H. Renick. |
| title_full | Unsteady propeller hydrodynamics by Dirk H. Renick. |
| title_fullStr | Unsteady propeller hydrodynamics by Dirk H. Renick. |
| title_full_unstemmed | Unsteady propeller hydrodynamics by Dirk H. Renick. |
| title_short | Unsteady propeller hydrodynamics by Dirk H. Renick. |
| title_sort | unsteady propeller hydrodynamics by dirk h renick |
| topic | Ocean Engineering. |
| url | http://hdl.handle.net/1721.1/8710 |
| work_keys_str_mv | AT renickdirkhampton1970 unsteadypropellerhydrodynamicsbydirkhrenick |