{"id":1324,"date":"2015-06-16T15:22:23","date_gmt":"2015-06-16T13:22:23","guid":{"rendered":"http:\/\/www.sva-potsdam.de\/nachstrom-2\/"},"modified":"2016-06-23T15:23:28","modified_gmt":"2016-06-23T13:23:28","slug":"wakefield","status":"publish","type":"post","link":"https:\/\/www.sva-potsdam.de\/en\/wakefield\/","title":{"rendered":"Wake Field"},"content":{"rendered":"
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\"wake_small_mRand\"<\/a><\/p>\n

\"XXL_ship_with_probe_small\"<\/a><\/p>\n<\/div>\n

\nFor a good propeller design it is necessary to have detailed knowledge of the nominal wake field and also the velocity distribution in the propeller plane. For experimental determination of wake fields, 5-hole ball probes, LDA<\/a> or PIV<\/a> (“Particle Image Velocimetry”), are used. It is standard that a 5-hole ball probe is used, offering the following options:<\/p>\n
    \n
  • Measurements in the propeller plane <\/li>\n
  • Measurements at the point of appendages, ie. the shaft struts<\/li>\n
  • With the probe, any coordinates can be approached<\/li>\n
  • 3-Dimensional wake field measurement<\/li>\n<\/ul>\n

    The standard measurement of a wake field for single screw vessels is carried out on 6 radii respectively, every 5 \u00b0. For measurements behind podded drives and shaft struts among others, the resolution is adjusted accordingly. <\/p>\n

    In addition to the experimental determination of the wake field, a calculation based on CFD simulation is possible. An advantage of a CFD simulation is the calculation of the velocity field for the Reynolds number of the full-size version. <\/p>\n<\/div>\n

     <\/p>\n

    \n

    Context Related References \/ Research Projects <\/strong><\/p>\n

    [1] Anschau, P., Mach, K.-P.: Application of a Stereo PIV System for Investigations of Flow Fields in Towing Tank and Cavitation Tunnel, HYDRONAV 2007, Wroclaw, Polen, September 2007
    \n[2] Grabert, R.: Der Einfluss unterschiedlichster Betriebszust\u00e4nde eines Schiffes auf das Nachstromfeld, 3. SVA-Forschungsforum, Potsdam, 28. Januar 2010:
    \n[3] L\u00fcbke, L.: Formoptimierung unter Ber\u00fccksichtigung der Charakteristik des Nachstromfeldes, 4. SVA-Forschungsforum, Potsdam, 27. Januar 2011<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

    For a good propeller design it is necessary to have detailed knowledge of the nominal wake field and also the velocity distribution in the propeller plane. For experimental determination of wake fields, 5-hole ball probes, LDA or PIV (“Particle Image Velocimetry”), are used. It is standard that a 5-hole ball probe is used, offering the following options: Measurements in the propeller plane Measurements at the point of appendages, ie. the shaft struts With the probe, any coordinates can be approached<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[47],"tags":[],"class_list":["post-1324","post","type-post","status-publish","format-standard","hentry","category-schiff-en"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t