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  • > 중형선박의 실운항 기준 CO2(DFOC)저감 기술 개발

중형선박의 실운항 기준 CO2(DFOC)저감 기술 개발

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Research Background

Topic 1 : Bow hull-form optimization in calm water and waves

Optimizer : PSO (Particle Swarm Optimization)

Wave-making resistance in calm water : 13.2% reduction

Added resistance in head waves

At λ/L=0.5 : 13.8% reduction

At sea state 5 : 9.5% reduction

Total resistance in calm water and waves

RAO of heave and pitch motions

Topic 2 : Effect of ship motions on added resistance in regular head waves : KVLCC2 

Model test in regular head waves

The averaged values of the ship motions in calm water and waves

Added resistance and ship motions in waves

Phase lag of ship motion to added resistance in waves

Topic 3 : Effects of diffraction in regular head waves on added resistance and wake

Objective ships : K-Supramax & KCS

Added resistance in waves

wake on the propeller plane in waves : K-Supramax

The orbital motion of water particles affects the wake region; the wake velocity is accelerated/decelerated                at wave crest/through.

Time histories of the mean wake velocity at constant r during one encounter period

Fixed condition
Free condition

Topic 4 : FDR-AF Paint

Toms effect & Polymer FDR Agent

Addition of few ppm of a high molecular weight polymer → up to 80% FDR

Major applications : petroleum pipeline

Ship application? Injection holes? Reliability?

SPC(Self-Polishing Copolymer) + Polymer DR agent → FDR paint

Rotor Braking Test : Comparison of Braking Time

△CF Calculator using Granvile's Similarity Scaling : Results

Extrapolation or 176K Bulk Carrier

Effect on Full-Scale Resistance Performance

FDR(Frictional Drag Reduction)-AP : found to give 18.2% drag reduction in full-scale relative to baseline AF

Cf. FOC decrease by 48.06% (before & after dry docking)