The 12th International Conference on Hydrodynamics
18 – 23 september 2016, Egmond aan Zee, The Netherlands
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EXPERIMENTAL STUDY OF THE EFFECT OF SPRAY RAILS FOR AXE-BOW HIGH SPEED HULLS


Go-down ichd2016 Tracking Number 120

Presentation:
Session: Ship hydromechanics resistance VI
Room: Room 1
Session start: 16:00 Tue 20 Sep 2016

Daehyuk Kim   yaho@snu.ac.kr
Affifliation: Seoul National University

Kye-pyo Rhee   kprhee@snu.ac.kr
Affifliation: Seoul National University

Nakwan Kim   nwkim@snu.ac.kr
Affifliation: Seoul National University

Jin-Hyung Ahn   posthvn1@add.re.kr
Affifliation: Agency for Defense Development


Topics: - Ship hydrodynamics resistance, propulsion, powering, seakeeping, manoeuvrability, slamming, sloshing, impact, green water

Abstract:

This paper presents experimental study of spray rails for axe-bow high speed hulls. Spray rails are generally used for the total resistance reduction. Spray rails are appended to most of high speed vessels to reduce spray generation. Some model tests for the investigation of spray rail effectiveness are conducted by Clement (1964a, 1964b) and Muller-Graf (1991). But used hull forms are planing hull and semi-displacement hull respectively, so the effectiveness of spray rails for other hull forms cannot be guaranteed. Hull form used in this paper is high speed axe-bow hull which are defined by Keuning (2001). In calm water tests, the resistance and running attitude (trim angle, rise of C.G.) are measured and spray generation change is evaluated from video capture. In motion in wave tests, pitch and heave motions are measured in head sea condition. Model tests are conducted by using high speed towing carriage and measurement system at Seoul National University. From the test results, is can be known that spray rails are very effective appendage to reduce the spray generation. The resistance and running attitude can be changed by the appended location of spray rails. Spray rails can change the running attitude, so pitch and heave motions in waves are also changed.