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Curled vortex propeller simulation


Propeller wake curl 119 Fig. 0 9Roll-uptrailingvortexforDTMB4119 a 0.020.040.060.080.100.120.14 Figure 1O appropriate smoothing parameter on the performance of Fig. 10Effectofsmoothingparameteron, KT, Ko4 Conclusion The above comparison of open water performance computing and trailing vortex of the numerical simulation results, the following conclusions can be drawn; 1) of the trailing vortex curling simulation method using hyperbolic quadrilateral surface element discretization of the trailing vortex in each panel on the use of linear dipole, while the introduction of non-singular smooth parameters, numerical simulation of the trailing vortex curled shape is reasonable, the method is effective and stable. 2) calculated from the open water performance results, with curly wake model in the wake model than experience to improve on accuracy. Experience some wake model has better accuracy paddle, others are poor, reflecting the accuracy depends on the calculation of the experience, and curly tail propeller vortex of all have good adaptability and can be completely calculated and determined, excluding man-made factors,[link widoczny dla zalogowanych], without any shape on the trailing vortex experimental observation information. From an engineering point of view, the design factor in the vicinity of the experience can be a reasonable wake, the results obtained can also meet engineering requirements. 3) The vortex shape by the numerical simulation of the iterative calculation, usually only need 2 or 3 iterations can be convergent solution, the calculation did not take into account the impact of paddle wheel, consider the paddle wheel, the tail-plane edge vortex curled shape is somewhat different, but the performance will not have significant impact. 4) Non-singular vortex shape on the smoothing parameter has a great influence, 6 greater the smaller the curl,[link widoczny dla zalogowanych], not even curly, can be seen from Figure l0, too small values have a certain impact on performance ,6-0 within the range of .03 to 0.1 almost no impact on the performance of the proposed value of 0.05 is about 6. 5) The wide blade turbine, at low advance coefficient,[link widoczny dla zalogowanych], the experience of wake vortex and curled the hydrodynamic properties of significant differences (such as the 4119 paddle), whereas little difference in the design advance coefficient,[link widoczny dla zalogowanych], the 2 tail vortex can basically meet the engineering requirements, the design of the propeller can be used to solve the problem. References: l1lKRASNYR. Computationofvortexsheetrollupinthetrefftzplane ~ J]. JournalofFluidMechanics, 1987,184 (16) :123-155 .12 IPYOS, KINNASSA. Propellerwakesheetroll-upmodelinginthreedimensions [J]. JournalofShipResearch, 1997,41 (2) :81-92. [3] RAMSEYWD. BoundaryintegralmethodforliftingbodieswithvortexwakesIDI. Cambrige, USAMIT, De-partmentof () ceanEngineering. 1996. [4] ITTC. ReportofthePropulsorCommittee [R]. SanFrancisco. 20thITTC, 1993. [5] KERWINJE, I. EEcsPredictionofsteadyandunsteadymarinepropellerperformancebynumericalliftin ~ surfacetheo-ryEA]. TransactionSNAIVlEEC]. Is. 1. ], 1978. [6] Tan Tingshou, Xiong Ying, Wang Xun. Surface Method for the Prediction of Unsteady propeller surface pressure distribution [J]. Shipbuilding of China,[link widoczny dla zalogowanych], 2000,41 (2) :15-21. TANTingshou, XIONGYing, WANGDexun. Predictionofunsteadypressuredistributiononsurfaceofpro-pellerbysurfacepanelmethod [J]. ShipbuildingofChi-na, 2000,41 (2) :15-21. [Editor: Zheng for]

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