Experimental investigation on axial velocity distribution for ship's twin-propeller jets. (3rd April 2017)

• Record Type: Journal Article
• Authors: Yew, Wan-Tian; Hashim, Roslan; Ng, Khai-Ching
• Is Part Of: Journal of the Chinese Institute of Engineers. Volume 40:Number 3(2017)
• Page Start: 191
• Page End: 199
• Publication Date: 2017-04-03
• Subjects: Twin-propeller jet -- axial velocity profile -- axial velocity decay; Technology -- Periodicals; Engineering -- Periodicals; 620.005
• DOI: 10.1080/02533839.2017.1299593
• Languages: English
• ISSNs: 0253-3839

Abstract

Abstract: The investigation of twin-propeller jets as ships undergo acceleration is essential. This form of jet has been triggering problematic consequences such as seabed scouring. In order to prevent such scouring, near-bed velocities must first be analyzed in order to design the necessary protection when the under keel clearance of a ship is low when it is near port structures. This paper presents experimental work performed by Laser Doppler Anemometry. It is noticed that research into twin-propeller jet profiles still remains limited in the literature. Therefore, we intend to analyze twin-propeller axial velocity profiles and look into several flow characteristics such as efflux velocity and its decay pattern. Also, the measured velocity profile is compared to that of a single-propeller jet. Current results show that scouring is more severe in the case of the twin-propeller jets.