m 50m 4,380 ton 80m 2 110kW The Offshore Floating Type Wave Power Device "Mighty Whale" Open Sea Tests; Part1 : An overvie

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1 m 50m 4,380 ton 80m 2 110kW The Offshore Floating Type Wave Power Device "Mighty Whale" Open Sea Tests; Part1 : An overview of the experimental system and the mooring operations Yukihisa WASHIO Hiroyuki OSAWA Yoshinori NAGATA Fuminori FUJII Hiroki FURUYAMA Shunsuke FUJITA Japan Marine Science and Technology Center (JAMSTEC) began open-sea tests on the prototype of the offshore floating type wave power device "Mighty Whale" on the 10th of September 1998, at the offing of Gokasho Bay, Nansei Town, Watarai District, Mie Prefecture. The prototype is a floating type wave power device based on the oscillating water column (OWC) principle, and is equipped with air turbines. The prototype dimensions are 30m width X 50m length, with a displacement of 4,380 tons. The device has three OWC chambers with an area 80m2 each, distributed breadth-wise and facing the predominant wave direction. Each chamber has a turbogenerator system based on a tandem-type Wells air turbine. The maximum total power output is 110 kw. The design conditions for the prototype were chosen to be those resulting from a once-in-50 years storm. Prototype construction was completed by the end of May Following construction, the prototype was towed to the test location, and final positioning and mooring operations were completed by the 13th of July The open sea tests began on the 10th of September, after all the adjustments on the measurement system were completed. This paper presents an overview of the experimental system, and provides an outline of the mooring operations. Key Words : wave energy, wave power device, oscillating water column, renewable energy Marine Technology Development Planning Department 1

2 Photo 1 Offshore Floating Type Wave Power Device "Mighty Whale" Fig. 1 Operating Principal 2 JAMSTECR, 40 (2000)

3 60m 30m 60m 50m 30m Table 1 Environmental Parameters T. Saville gh 1/3 = gf 2 2 U 10 U 10 gt 1/3 = gf 2 2 2πU 10 U /2 5 1/3 S M B Sverdrup Munk Bretshneider g H 1/3 U 10 10m 10 F T 1/3 0.6m/s 0.56m/s 1.2m/s NK P NK P JIS JEC JEM SBA JAMSTECR, 40 (2000) 3

4 NK / m No m Table 3 Wave condition for structural analysis Table 4 Stress by structural analysis Fig. 2 General arrangement Table 2 Principal Particulars of prototype 4 JAMSTECR, 40 (2000)

5 Fig. 3 Bending moment and shearing stress Table 6 Specification of corrosion protection (Sacrificial anode method) Table 5 Specification of painting 5 15 JAMSTECR, 40 (2000) 5

6 Table 8 Specification of principal apparatus Fig. 4 Schematic of tandem-type Wells turbine Fig. 5 Turbine torque coefficient Fig. 6 Turbine efficiency Table 7 Specification of turbines 2 6 JAMSTECR, 40 (2000)

Fig. 7 One-line diagram of power circuit of prototype 15 47 50kW 10kW 30kW

7 Fig. 7 One-line diagram of power circuit of prototype kW 10kW 30kW Photo 2 No. 1 turbine and generator system (50kW 10kW) DC JAMSTECR, 40 (2000) 7

8 Photo 3 Air compressor Table 9 Specification of air compressor Fig. 8 Valve arrangement for self-sinking system Fig. 9 Schematic of measurement and control system 8 JAMSTECR, 40 (2000)

9 Table 10 Onboard measurement items and instruments JAMSTECR, 40 (2000) 9

10 P m mm 130mm 100m 81mm 207m 2 14ton mm Fig. 10 Schematic of mooring system Photo 4 Intermediate weight (14 ton in water) Fig. 11 Characteristics of mooring line Photo 5 Concrete anchor (165 ton in water) 10 JAMSTECR, 40 (2000)

Table 11 Specification of mooring line Table 12

condition) Photo 6 Chain stopper 12 45 No.2 No.

0 13 45 14 90 12 X 50m Y 70m 75m Table 14 Wind,

11 Table 11 Specification of mooring line Table 12 Maximum mooring tension and safety factor Table 13 Wind, wave and current condition for investigating of drifting range (Onshore condition) Photo 6 Chain stopper No.2 No ton 130mm X 50m Y 70m 75m Table 14 Wind, wave and current condition for investigating of drifting range (Offshore condition) 20 JAMSTECR, 40 (2000) 11

Fig. 12 Drifting range of prototype 7 18 12 10 3 7 3,600t 1,300t Photo 7 Launching work by floating

12 Fig. 12 Drifting range of prototype ,600t 1,300t Photo 7 Launching work by floating crane from dock % 80% 100PS 1.1ton ,000PS 1 3,000PS 1 2 3,000PS 12 JAMSTECR, 40 (2000)

13 : km 40m SE SW SE S 90% S SW 85% 1/3 1/ sec 8 8 km km 2 1/ m 94% g/cm 3 4 6m m 3 6m 1.5m Fig. 13 Towing route 17 Fig. 14 Towing arrangement JAMSTECR, 40 (2000) 13

14 Table 15 Investigation for towing force Fig. 15 Location of test site 1,600ton ROV DGPS Differential GPS Fig. 16 Exploration area for mooring work 18 1,600ton JAMSTECR, 40 (2000)

15 Photo 8 Mooring work of prototype Fig. 7 Flow chart of mooring work Photo 9 Chain stopping work 19 1/3 4 10m 20 30kW Photo 10 "Mighty Whale" on test site JAMSTECR, 40 (2000) 15

16 Fig. 18 Mooring condition Fig. 19 Actual example of wave height at open sea test (September 10 September 30, 1998) Fig. 20 Actual example of power generation at open sea test (02:50 03:10 on September 16,1998) 16 JAMSTECR, 40 (2000)

17 JAMSTECR, 40 (2000) 17

Optical Lenses CCD Camera Laser Sheet Wind Turbine with med Diffuser Pitot Tube PC Fig.1 Experimental facility. Transparent Diffuser Double Pulsed Nd:

Optical Lenses CCD Camera Laser Sheet Wind Turbine with med Diffuser Pitot Tube PC Fig.1 Experimental facility. Transparent Diffuser Double Pulsed Nd: *1 *2 *3 PIV Measurement of Field of the Wind Turbine with a med Diffuser Kazuhiko TOSHIMITSU *4, Koutarou NISHIKAWA and Yuji OHYA *4 Department of Mechanical Engineering, Matsue National Collage of Technology,