IHIMU Energy-Saving Principle of the IHIMU Semicircular Duct and Its Application to the Flow Field Around Full Scale Ships IHI GHG IHIMU CFD PIV IHI M

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IHIMU Energy-Saving Principle of the IHIMU Semicircular Duct and Its Application to the Flow Field Around Full Scale Ships IHI GHG IHIMU PIV IHI Marine United Inc. ( IHIMU ) has already developed several energy-saving devices, such as their L.V. Fin ( Low Viscous Fin ), A.T. Fin ( Additional Thrusting Fin ), CRP ( Contra-Rotating Propeller ) and the IHIMU Semicircular Duct. The L.V. Fin, A.T. Fin and CRP have been employed in full-scale ships, and the energy savings expected have been confirmed. In order to employ the IHIMU Semicircular Duct in full scale ships, we verified the energy-saving principle of this device and optimized a full-scale shape for it, taking into account flow-field differences between the models and full-scale ships, through the use of ( Computational Fluid Dynamics ) and PIV ( Particle Image Velocimetry ) techniques. This paper describes the energy-saving principle of this device and an outline of a design for its employment in full scale ships. 1. 緒言 GHG 3 IMO EEDI CO 2 ( IHIMU ) A.T.Fin ( Additional Thrusting Fin ) ( 1 ) ( 2 ) L.V.Fin ( Low Viscous Fin ) ( 3 ) CRP ( Contra-Rotating Propeller ) ( 4 ) ( 5 ) ( Computational Fluid Dynamics ) PIV 2. 半円型ダクトの作動原理 2. 1 省エネ原理 第 1 図 IHI Vol.5 No.4 ( 21 ) 33

( a ) 1 t ( b ) 1 w ( 1 ) 1 t 1 w t w ( 1 ) 第 1 図 ( 2 ) ( 1 ) ( 5 ) ( 2 ) PIV 2. 2 省エネ原理の検証 2. 2. 1 検証の方法 PIV ( 6 ) NEPTUNE ( 7 ) SURF ( 8 ) 2. 2. 2 の推定精度 SURF 第 2 図 ( 2 ) ( 1 ) ( 2 ) 2 第 1 図 Fig. 1 Basic energy-saving principle 第 2 図 Fig. 2 Comparison of changes due to employment of duct obtained by tank test and in self propulsion factor 第 2 図 2. 2. 3 ダクト作動流場 PIV 第 3 図 ~ 第 5 図 PIV 第 3 図 Fig. 3 Comparison of flow velocity distribution behind duct during propeller operation 34 IHI Vol.5 No.4 ( 21 )

( a ) ( b ) 第 4 図 Fig. 4 Comparison of estimates of pressure distribution behind duct during propeller operation PIV 第 3 図 第 4 図 第 5 図 第 5 図 Fig. 5 Comparison of vorticity distribution behind duct during propeller operation 3 t 第 6 図 第 7 図 第 6 図 第 7 図 2. 2. 4 ダクト推力 3 Top Side 第 8 図 Top Side Top Top 2. 3 半円型ダクトの設計コンセプト ( 1 ) ( 2 ) 3. 半円型ダクトの実機設計 IHI Vol.5 No.4 ( 21 ) 35

( a ) ( b ) ( c ) ( d )..5.1.15..1..1..1 1. 2. Lpp y z 第 6 図 PIV Fig. 6 Comparison of PIV measurements of vorticity distribution behind duct during propeller operation 9. 8. 7. 6. 5. 4. 3. 2. 1.. 5.7 8.1 7.7 第 7 図 Fig. 7 Improvement of wake gain due to employment of duct obtained by tank test 3. 1 ダクト作動流場の尺度影響 第 9 図 第 1 図 第 9 図 第 1 図 Top A B C A B C q = q q = 18 1 2 3 4 5 6 7 8 9 1 *1 *1 Top 第 8 図 Fig. 8 estimate of attack angle of duct leading edge during propeller operation 36 IHI Vol.5 No.4 ( 21 )

( a ) ( b ) z.15.1.5..5.1.15 X Vorticity 2 18 16 14 12 1 8 6 4 2 2 4 6 8 1 12 14 16 18 2..1.2.3.4..1.2.3.4 y y z.15.1.5..5.1.15 9 Fig. 9 estimate of vorticity distribution at the front of duct during propeller operation X Vorticity 2 18 16 14 12 1 8 6 4 2 2 4 6 8 1 12 14 16 18 2 X Vorticity y z q = q q = 18 1 2 3 4 5 6 7 8 9 1 *1 *1 Top 1 Fig. 1 Comparison of estimates of inflow angle at leading edge of duct during propeller operation 3. 2 3. 1 11 11 Fig. 11 Comparison of the duct arrangement IHI Vol.5 No.4 ( 21 ) 37

4. 結言 GHG PIV 参考文献 ( 1 ) IHI A.T.Fin 1 23 3 1983 5 pp. 266 273 ( 2 ) IHI A.T.Fin 2 25 2 1985 3 pp. 9 96 ( 3 ) IHI-L.V.Fin 38 6 1998 11 pp. 392 397 ( 4 ) Y. I n u k a i a n d F. O c h i A S t u d y o n t h e characteristics of self-propulsion factor for a ship equipped with Contra-Rotating Propeller The First International Symposium on Marine Propulsors smp 9 ( 29. 6 ) pp. 112 116 ( 5 ) IHIMU 46 4 26 12 pp. 151 155 ( 6 ) PIV 9E 29 11 pp. 11 14 ( 7 ) N. Hirata and T. Hino An efficient algorithm for simulating free-surface turbulent flows around an advancing ship J. of the Soc. Naval Arch. Japan Vol. 185 ( 1999. 6 ) pp. 1 8 ( 8 ) T. Hino A 3D Unstructured Grid Method for Incompressible Viscous Flows J. of the Soc. Naval Arch. Japan Vol. 182 ( 1997. 12 ) pp. 9 15 38 IHI Vol.5 No.4 ( 21 )

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