無轂環驅式推進器為近年來無刷永磁馬達發展下的產物，由於其良好的性能表現，很適合應用在小型無人載具上。而設計發展的過程中，由於其內部包含複雜的渦流、紊流等現象，因此更需要數值分析或實驗的配合修正，以達到預期的效果。
本文目的在於探討一無轂環驅式推進器之流場特性，研究方法為在不同的入流流速（Vs=1.00m/s、2.00m/s、3.00m/s）與螺槳轉速（n=1000rpm、1500rpm、2000rpm）下，使用商用計算流體力學軟體STAR-CD進行數值模擬，並比較整體推進器之流場、葉片環流量、流場渦度、推力轉矩之性能，其後與MIT-PLL設計程式之結果作一比較。文中發現在入流流速Vs=2.00m/s、轉速n=2000rpm下，有最佳的推進器效率表現。而比較設計條件下的數值分析結果與MIT-PLL設計結果後發現，整體推力並不如預期，原因包括葉片外型的改變、導罩與葉片未能配合設計、升力線理論設計步驟不完整等等原因。

The Hubless Rim-Driven Propulsor is an extention of brushless PM motor in recent years. Because its good performance, it is very suitable for small remotely operated vehicles. In the design and development process, because it’s flow field includes some complicated phenomena like vortex and turbulence, it needs some simulation or experiment to correct designed geometry in order to reach the goal.
In this study, we discuss the Hubless Rim-Driven Propulsor’s flow field at varying inflow velocities (1m/s, 2m/s, 3m/s) and propeller rotation rates (1000rpm, 1500rpm, 2000rpm), by the commercial computational fluid dynamics software, STAR-CD, which simulates the flow field of the propulsor. We compare some performances like the flow field of propulsor, blade circulation, vorticity, and thrust-torque between different cases with the result of a lifting-line design program, MIT-PLL. We found that the best propulsor’s efficiency occurred at 2m/s inflow velocity and 2000rpm rotation rate. And the thrust by simulation is less than the result of design program at the same design condition, not as good as expected. The reason includes the change of blade geometry, duct design not integrated with blade, and the limits of lifting line design process.

Brewer, W. H.; Marcum, D. L.; Jessup, S. D.; Chesnakas, C.; Hyams, D. G.; and Sreenivas, K., 2003, “An Unstructured RANS Study of Tip-Leakage Vortex Cavitation Inception”, Fluid Engineering Division Summer Meeting, Honolulu, Hl USA.
Chen, B.; and Stern, F., 1999, “Computational Fluid Dynamics of Four-Quadrant Marine-Propulsor Flow”, J. Ship Res., Vol. 4, 43, pp. 218-228.
Coney, W. B., 1988, “MIT-PLL Propulsor Lifting Line Code User’s Manual”.
Feng, J.; Wang, V. A.; Lee, Y. T.; and Merkle, C. L., 1998, “CFD Modeling of Tip Vortex for Open Marine Propeller”, ASME FED Summer Meeting, Washington, DC.
Funeno, I., 2002, “On Viscous Flow around Marine Propellers - Hub Vortex and Scale Effect”, J. Kansai Soc. N. A., Japan, No. 238, pp. 17-27.
House, E., 1973, “Performance of Tilted Ducts”, Symposium on ducted propellers (RINA), London, pp. 225-234.
Judge, C. Q.; Oweis, G. F.; Ceccio, S. L.; Jessup, S. D.; Chesnakas, C. J.; and Fry, D. J., 2001, “Tip-Leakage Vortex Interaction on a Ducted Rotor”, CAV 2001: The 4th International Symposium on Cavitation, Pasadena, CA.
Kerwin, J. E.; and Greeley, D. S., 1982, “Numerical Methods for Propeller Design and Analysis in Steady Flow”, Transactions of SNAME, Vol. 114, pp. 415-453.
Kerwin, J. E.; Spyros, A. K.; Lee, J. T.; and Shih, W. Z., 1987, “A Surface Panel Method for The Hydrodynamic Analysis of Ducted Propellers”, Transactions of SNAME, Vol. 90, pp. 93-122.
Kim, J., 2002 “Sub-Visual Cavitation and Acoustic Modeling for Ducted Marin Propulsor”, Ph.D. thesis, The University of Iowa, IA.
Kim J; and Paterson, E. G., 2006, “RANS Simulation of Ducted Marine Propulsor Flow Including Subvisual Cavitation and Acoustic Modeling”, Journal of Fluid Engineering, Vol. 128, pp. 799-810.
Kim, W. J.; Van, S. H.; and Kim, D. H., 2001, “Measurement of Flow around Modern Commercial Ship Models”, Experiments in Fluids, Vol. 31, pp. 567-578.
Lerbs, H. W., 1952, “Moderately Loaded Propellers with A Finite Number of Blade and An Arbitrary Distribution of Circulation”, Transaction of SNAME, Vol. 60, pp. 73-123.
Oosterveld, M. W. C., 1970, “Wake adapted Ducted Propeller”, Netherlands Ship Model Basin, Wageningen, Publication No 345.
Park, W. G.; Jung, Y. R.; and Kim, C. K., 2005, “Numerical flow analysis of single-stage ducted marine propulsor”, Ocean Engineering, Vol. 32, pp. 1260-1277.
Patankar, S. V.; and Spalding D. B., 1972, “A calculation procedure for heat, mass and momentum transfer in three-dimensional parabolic flows”, Int. J. Heat Mass Transfer, Vol. 15, pp. 1787.
Paterson, E. G.; Wilson, R. V.; and Stern, F., 2003, “General Purpose Parallel Unsteady RANS Ship Hydrodynamics Code: CFDSHIP-IOWA”, HHR Report No. 432, The University of Iowa City, IA.
Rasmussen, U. M.; Weis-Fogh, K., 1995, “Numerical analysis of marine propellers for noise & vibration control purposes”, RINA international conference on noise & vibration in the marine environment.
Richardson, K. M.; Pollock, C.; and Flower, J. O., 1996, “Design and Performance of A Propulsion Unit”, IEEE, Vol. 1, pp. 168-173.
Sanchez-Caja, A., 1996, “Numerical Calculation of Viscous Flow Around DTRC Propeller 4119 for Advance Number Range 0.3-1.1 Using the FINFLO Navier-Stokes Solver”, Technical Report VALB141A, VTT Manufacturing Technology, Tekniihantie 12, Espoo, Finland.
Stern, F.; Wilson, R. V.; Coleman, H.; and Peterson, E. G., 2001, “Comprehensive Approach to Verification and Validation of CFD Simulations---Part 1: Methodology and Procedure”, ASME J. Fluids Eng., Vol. 4, 123, pp. 793-802.
Suh, N. E.; Rogers, S. E.; and Dictz, W. E., 2002, “PEGASUS 5: An Automated Preprocessor for Overset-Grid CFD”, AIAA Paper No. 2002-3186
Wilson, R. V.; Stern, F.; Coleman, H.; and Peterson, E. G., 2001 “Comprehensive Approach to Verification and Validation of CFD Simulations---Part 2: Application for RANS Simulation of Cargo/Container Ship”, ASME J. Fluids Eng., Vol. 4, 123, pp. 803-810.
柯永澤，1990，“間隙效應與螺槳自由渦面形狀對導罩螺槳性能之影響＂，中國造船暨輪機工程學刊，第九卷，第一期，頁57-72。
石玉山，2004，“水下載具環驅推進器之幾何設計及性能分析＂，國立成功大學系統及船舶機電工程研究所碩士論文。
陳雅惠，2004，“水下載具環驅推進器之機構設計及流場特性＂，國立成功大學系統及船舶機電工程研究所碩士論文。
李宗衛，2006，“環驅式推進器之設計與流場特性＂，國立成功大學系統及船舶機電工程研究所碩士論文。
林清福、李建樺、許瑋宗、黃勤編著，2004，“CATIA V5R13 逆向工程產品設計＂，全華科技圖書股份有限公司。