Three-dimension efflux velocity characteristics of marine propeller jets

Hamill, Gerard; Kee, Charmaine; Ryan, Donal

doi:10.1680/jmaen.14.00019

Cited by 20 publications

(5 citation statements)

References 6 publications

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“…Hamill et al, 2004) (G. A. Hamill & Kee, 2016. Based on the calculation results of previous studies such as (G. Hamill et al, 2015), (Fuehrer et al, 1987), (Blaauw & van de Kaa, 1978), (Verhey, n.d.), (Lam et al, 2011), (Hashmi, 1993), (Berger et al, 1981), (Blaauw & van de Kaa, 1978), the velocity decay (Vmax/Vo) tends to decrease significantly in ZFE.…”

Section: Methodsmentioning

confidence: 99%

“…In the range x/Dp > 3.25 in the zone of established flow, the velocity value is determined using the equation of Fuehrer (Fuehrer et al, 1987), Hamill (G. Hamill et al, 2015), Stewart (Jiang et al, 2019), Hashmi (Hashmi, 1993), Bergerl (Berger et al, 1981), Blaauw (Blaauw & van de Kaa, 1978) respectively. The radial velocity distribution is determined using the equation by Fuehrer (Fuehrer et al, 1987) and Blaauw (Blaauw & van de Kaa, 1978), respectively.…”

Section: 𝑉𝑜 = 𝐸 𝑜 𝑛𝐷√𝐶𝑡mentioning

confidence: 99%

“…In the range 0 < x/Dp < 0.35 in the zone of flow establishment, the efflux velocity (Vo) is determined using the following equation developed by Fuehrer (Fuehrer et al, 1987), Hamill (G A Hamill, 1988), Stewart (Lam et al, 2011), Hashmi (Hashmi, 1993), andHamill (G. Hamill et al, 2015), respectively.…”

Section: Empirical Approachmentioning

confidence: 99%

“…In the range 0.35 < x/Dp < 3.25, the maximum axial velocity (Vmax) was determined using the equation proposed by Verhey (Verhey, n.d.), Hamill (G. Hamill et al, 2015), Stewart (Jiang et al, 2019) and Lam (Lam et al, 2011), respectively.…”

Section: 𝑉𝑜 = 𝐸 𝑜 𝑛𝐷√𝐶𝑡mentioning

confidence: 99%

“…The propeller rotation changes the shaft torque, accelerating the water flow to produce an axial thrust towards the ship (Massey, 2006) (Carlton, 2007). Several factors determine the speed of water flow, including the size and rotation of the propeller and the coefficient of thrust, used (G. Hamill et al, 2015). The water flow velocity can significantly cause erosion and sediment suspension when it reaches the bottom (Kaidi et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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The Ship’s Propeller Rotation Threshold in Initiating Erosion and Sedimentation on Coastal Water

Kadir¹,

Istadi

Subagio

et al. 2023

Preprint

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Seabed particles with low shear stress limits are prone to erosion and sedimentation, affecting the balance of aquatic ecosystems. The water flow velocity triggered by the rotation of the ship's propellers can reach the seabed and exert significant pressure on elementary particles. However, by setting the propeller rotation threshold, the process of erosion and sedimentation of the seabed can be controlled. This study determines the propeller rotation threshold of the Landing Craft Tank (LCT) ship based on the water flow velocity it produces. The water flow velocity was investigated at several variations of propeller rotation (rpm) and variations of water depth using numerical and empirical approaches. Then, scale model experiments were carried out in the laboratory. Analysis based on the general standard criteria for erosion and sedimentation shows that an LCT vessel with a propeller diameter of 1.5 meters can use a propeller rotation of 25 rpm in all water depths. The propeller rotation of 75 rpm is safe if the propeller shaft distance to the seabed is at least 1Dp (Dp is the propeller's diameter). A 120 rpm propeller rotation is safe to use at a minimum distance of 1.5Dp, and a 230 rpm propeller rotation is safe for a minimum distance of 2Dp. Threshold values vary based on the particle type and the water depth. The propeller rotation threshold criteria are essential in determining the new under-keel clearance (UKC) to realize environmentally friendly ship operations.

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