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<table border="0" cellpadding="3" cellspacing="1" width="100%" class="forumline"> <tr> <th class="thCornerL" width="22%" height="26">Autor</th> <th class="thCornerR">Wiadomość</th> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>loiwtjsf</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="http://picsrv.fora.pl/subSilver/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Wysłany: Nie 2:08, 12 Gru 2010<span class="gen"> </span> Temat postu: ugg milano Curled vortex propeller simulation _122</span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">Curled vortex propeller simulation <br /> <br /> <br />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,<a href="http://www.stivaliuggboots.com" target="_blank" class="postlink">ugg milano</a>, 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,<a href="http://www.stivaliuggboots.com" target="_blank" class="postlink">ugg italia</a>, 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,<a href="http://www.stivaliuggboots.com" target="_blank" class="postlink">stivali ugg</a>, 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,<a href="http://www.toryburchsaler.net" target="_blank" class="postlink">tory burch</a>, 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,<a href="http://www.toryburchsaler.net" target="_blank" class="postlink">tory burch shoes</a>, 2000,41 (2) :15-21. TANTingshou, XIONGYing, WANGDexun. Predictionofunsteadypressuredistributiononsurfaceofpro-pellerbysurfacepanelmethod [J]. ShipbuildingofChi-na, 2000,41 (2) :15-21. [Editor: Zheng for] <br /> <br />相关的主题文章： <br /> <br /> <br /> <a href="http://blackboxx.forumup.org/viewtopic.php?p=39167&mforum=blackboxx#39167" target="_blank" class="postlink">ugg milano Particle size testing and measuring _88</a> <br /> <br /> <a href="http://www.4fbbs.cn/bbs/viewthread.php?tid=135542&extra=" target="_blank" class="postlink">ugg prezzo InSb magnetic resistance the angular displacement sensor _2242</a> <br /> <br /> <a href="http://lothjyie.blog.163.com/blog/static/170233300201011127393145/" target="_blank" class="postlink">ugg italia VXI bus based multi-channel multi-sampling rate data acquisition system _2111</a></span></td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="http://picsrv.fora.pl/subSilver/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> </table>
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