Interactions Between Thrusters Attached to a Vessel Hull

2002 ◽  
Author(s):  
L. Elkstrom ◽  
D. T. Brown
Keyword(s):  
Experimental Study ◽  
Experimental Work ◽  
Mechanical Engineering ◽  
Dynamic Positioning ◽  
Station Keeping ◽  
Combined Motion ◽  
Close Proximity ◽  
University College London ◽  
Flow Through ◽  
In Transit

Many offshore vessels are equipped with rotating (azimuthing) thrusters for ease of manoeuvring and dynamic positioning. Accurate prediction of available thrust to resist horizontal environmental forces is important allowing the station-keeping capability of these vessels to be established. Additionally such thrusters are in many cases used, possibly in conjunction with tunnel thrusters and main propeller to provide propulsive power in transit. This paper presents results from a comprehensive experimental study to establish the influence on thruster performance of variations in current inflow velocity, thruster power, and thruster position relative to the hull. Furthermore the influence of two thrusters in close proximity, azimuthing so that flow into one thruster is influenced by the flow through the second thruster, is addressed. The experimental work was carried out using the wave tank and combined motion carriage facility in the Department of Mechanical Engineering at University College London.

Vessel Thruster-Thruster Interactions During Azimuthing Operations

2005 ◽  
Author(s):  
D. T. Brown ◽  
L. Ekstrom
Keyword(s):  
Experimental Study ◽  
Accurate Prediction ◽  
Dynamic Positioning ◽  
Station Keeping ◽  
Inflow Velocity ◽  
Flow Interaction ◽  
Close Proximity ◽  
Flow Through ◽  
In Transit ◽  
Propulsive Power

Flow interaction between thrusters is important, as many offshore vessels are equipped with rotating (azimuthing) thrusters for ease of manoeuvring and dynamic positioning. Accurate prediction of available thrust to resist horizontal environmental forces is essential allowing the realistic station-keeping capability of these vessels to be established. Additionally such thrusters are in many cases used, possibly in conjunction with tunnel thrusters and main propeller to provide propulsive power in transit. This paper presents the influence of two thrusters in close proximity, azimuthing so that flow into one thruster is influenced by the flow through the second thruster. The work extends that previously presented in OMAE 2002, based on a comprehensive experimental study to establish the influence on thruster performance of variations in current inflow velocity, thruster power, and thruster position relative to the hull.

EXPERIMENTAL STUDY ON FLAME PROPAGATION IN A STRAIGHT PIPE

2016 ◽  
Vol 78 (8-3) ◽  
Author(s):  
Siti Zubaidah Sulaiman ◽  
Rafiziana Md Kasmani ◽  
A. Mustafa
Keyword(s):  
Experimental Study ◽  
Flame Propagation ◽  
Experimental Work ◽  
Diameter Ratio ◽  
Straight Pipe ◽  
Pipe Length ◽  
Operating Condition ◽  
Consistent Trend ◽  
Length To Diameter Ratio

Flame propagation in a closed pipe with diameter 0.1 m and 5.1 m long, as well as length to diameter ratio (L/D) of 51, was studied experimentally. Hydrogen/air, acetylene/air and methane/air with stoichiometric concentration were used to observe the trend of flame propagation throughout the pipe. Experimental work was carried out at operating condition: pressure 1 atm and temperature 273 K. Results showed that all fuels are having a consistent trend of flame propagation in one-half of the total pipe length in which the acceleration is due to the piston-like effect. Beyond the point, fuel reactivity and tulip phenomenon were considered to lead the flame being quenched and decrease the overpressures drastically. The maximum overpressure for all fuels are approximately 1.5, 7, 8.5 barg for methane, hydrogen, and acetylene indicating that acetylene explosion is more severe. 

An experimental study of the stability of mass standards in transit

Metrologia ◽  
2008 ◽  
Vol 45 (2) ◽  
pp. 233-240 ◽  
Author(s):  
K Fen ◽  
E C Morris
Keyword(s):  
Experimental Study ◽  
The Stability ◽  
In Transit

Fluid Flow Through Screens of Low Solidity

1962 ◽  
Vol 66 (613) ◽  
pp. 54-56 ◽  
Author(s):  
P. G. Morgan
Keyword(s):  
Fluid Flow ◽  
Experimental Work ◽  
General Problem ◽  
Theoretical Treatment ◽  
Flow Through

The general problem of the flow through screens has been widely studied, but certain difficulties have arisen in the comparison of screens of various solidities. A theoretical treatment and some experimental work on the flow through screens of low solidity are described below.

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