Yayın tarihi için Makine Mühendisliği Bölümü Koleksiyonu listeleme
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Powering and seakeeping characteristics of a displacement hullform with waterline parabolization
(2010)Waterline parabolization is a design procedure used for displacement vessels to decrease the wave resistance of the hullform through the addition of amidships bulbs. The bow and shoulder wave system of a parent hullform ... -
Three-dimensional effects and arm effects on modeling a vertical axis tidal current turbine
(Pergamon-Elsevier Science Ltd, 2010)Three-dimensional effects in studying a vertical axis tidal current turbine are modeled using a newly developed vortex method. The effects on predicting power output and wake trajectory are analyzed in particular. The ... -
Modeling of twin-turbine systems with vertical axis tidal current turbines: Part I-Power output
(Pergamon-Elsevier Science Ltd, 2010)Recent interest in the tidal current industry has driven development of the prototype from the stand-alone turbine to the twin-turbine system. In this paper, we develop a numerical model to systematically analyze the ... -
Estimating Power Output from a Tidal Current Turbine Farm with First-order Approximation of Hydrodynamic Interaction between Turbines
(Taylor & Francis Inc, 2010)This article presents a numerical approach to estimate power output from a tidal current turbine farm with first-order approximation of hydrodynamic interactions between multiple turbines. An example study is conducted by ... -
Second-order wave diffraction by horizontal rectangular barriers
(2011)A complete second-order analytical solution for the nonlinear diffraction of waves by 2-D rectangular cylinders fixed at the free surface of finite-depth waters is presented. As a sequel to a previous linear treatment of ... -
Modeling of twin-turbine systems with vertical axis tidal current turbine: Part II-torque fluctuation
(Pergamon-Elsevier Science Ltd, 2011)We recently showed the advantage of using a numerical system to extract energy from tidal currents by developing a new twin-turbine model (Li and Calisal, 2010a). Encouraged by this result, we decided to use this model to ... -
Comparison of Additive Protective Layer On the Cylinder Liner Surface Using Diesel Engine and Pin-On-Plate Test Rigs
(Scibulcom Ltd, 2011)In this research, the layer formation of additives on the surface of cylinder liner (single cylinder Diesel engine liner operated 22 h) was examined by using binocular, optical, scanning electron microscope and energy ... -
Effect of Additive Level On the Surface of Diesel Engine Cylinder Liner
(Scibulcom Ltd, 2011)In this research the surface of the cylinder liner was examined from metallurgical standpoints, using specimens cut from real engine component (single cylinder diesel engine liner operated 22 h), in order to identify the ... -
A numerical study on squat of a wigley hull
(2011)A numerical study is conducted to calculate the squat for a wigley hull. An approach based on slender body theory is used to convert the three dimensional ship problem into a series of two dimensional problems in cross ... -
An integrated model for estimating energy cost of a tidal current turbine farm
(Pergamon-Elsevier Science Ltd, 2011)A tidal current turbine is a device for harnessing energy from tidal currents and functions in a manner similar to a wind turbine. A tidal current turbine farm consists of a group of tidal current turbines distributed in ... -
Comparison of two base-potentials for a slender-body method
(2012)The effects of two base-potentials on the accuracy of a slender-body method are studied in this paper. In the formulation for this method which is developed for the slender ships, the velocity potential is decomposed into ... -
Hydrodynamic aspects of oscillating flow through porous media consisting of steel spheres
(Springer International Publishing, 2014)Hydrodynamic aspects of oscillating flow through porous media are investigated within the scope of this experimental work where water is used as the flow medium. Friction factors are found reducing the data of hydrodynamic ... -
A Detailed Analysis of Ideal Rankine Steam Cycle
(Amer Soc Naval Eng Inc, 2016)In this theoretical work, the ideal Rankine cycle using water vapor is studied in detail considering a condenser pressure range of 10-80 kPa, a boiler pressure range of 3-15 MPa and a superheater temperature range of 350-600 ... -
Parabolization and structural integrity of side bulb applied to a platform supply vessel
(DTU Mechanical Engineering, Technical University of Denmark, 2016)The waterline parabolization is a hull form-optimization method, Calisal et al. (2002) reported a 10% decrease in the effective horse power at Fr = 0.275 for a coaster tanker. The present study was made for an oil platform ... -
Investigating the influence of tool shape during FSW of aluminum alloy via CFD analysis
(Chinese Inst Engineers, 2016)This paper describes the application of the CFD code, Comsol Multiphysics, to modeling the 3-D metal flow in friction stir welding of AA 2024-T3 aluminum alloy in order to investigate the influence of tool shape over the ... -
An Integrated Approach to Increase Marine Transportation Safety in Harbor Areas
(Marine Technology Soc Inc, 2017)The importance of marine transportation safety in harbors and waterways access has become a very serious governmental concern in recent years, with the holding of special conferences on major marine disasters, increasing ... -
On flow fluctuation's impact on the performance of vertical axis turbines-A potential flow analysis
(Amer Inst Physics, 2017)During the last decade, with rapidly increasing deployment of tidal current turbine prototypes in many countries, a number of failures have been reported. Several of these failures were attributed to the intensive flow ... -
Mathematical programming basis for ship resistance reduction through the optimization of design waterline
(Springer Japan Kk, 2017)It has been more than a decade since Calisal et al. (J Ship Res 46(3):208-213, 2002) presented their concept of wave resistance reduction by allowing an increase in the beam of a ship accompanied by smoothing the shoulders. ... -
A Practical Tool for Evaluating Refrigeration Systems Using R-134a
(2017)Bu teorik çalışmada R-134a (Tetrafloretan, klor içermeyen bir soğutucu akışkan) kullanılan buhar sıkıştırmalı soğutma çevrimi 100-200 kPa buharlaştırma basıncı aralığında, 0.8-1.6 MPa yoğuşturucu basıncı aralığında olmak ... -
Sürtünme Karıştırma Kaynağı Yapılmış Alüminyum Alaşımlarının Isı Akışının Modellemesi ve Pratik Doğrulaması
(2017)Bu makalede AA 6061-T6 alüminyum alaşımının sürtünme karıştırma kaynağının Comsol Multiphysics 3.5a ile yapılan üç boyutlu modellemesi anlatılmıştır. Simülasyon kaynak edilecek iki alüminyum levhasını, kaynak takımını ve ...
