Investigation of mottling in radiography of directionally solidified ni-based alloy gas turbine blades

Aygün, Hacer


Production and characterization of CaNi₅-xMx compounds for metal hydride batteries
Muğan, Orkun; Aydınol, Mehmet Kadri; Department of Metallurgical and Materials Engineering (2012)
Ni - MH batteries have superior properties which are long cycle life, low maintenance, high power, light weight, good thermal performance and configurable design. Hydrogen storage alloys play a dominant role in power service life of a Ni - MH battery and determining the electrochemical properties of the battery. LaNi5, belonging to the CaCu5 crystal structure type, satisfy many of the properties. The most important property of LaNi5 is fast hydrogen kinetics. Recently, CaNi5, belonging to same crystal type,...
Simulation of the Transient Response of a Helicopter Turboshaft Engine to Hot-Gas Ingestion
Uzol, Oğuz; Yavrucuk, İlkay (2008-06-09)
Hot-Gas Ingestion (HGI) to the engines can potentially occur when a rotorcraft or a VTOL/STOVL fixed-wing aircraft is operating in close proximity to the ground. Especially for helicopters, due to the rotor downwash hot exhaust gases get recirculated into the engine inlet. Similar conditions may also occur due to the ingestion of hot exhaust gases from rocket launchers or gun fire. In this study, we present the results of a simulation of the transient response of a helicopter turboshaft engine to HGI. Speci...
Development of magnesium based negative electrode materials for nickel metal hydride batteries
Eyövge, Cavit; Öztürk, Tayfur; Department of Metallurgical and Materials Engineering (2017)
Negative electrode materials of the nickel metal hydride (NiMH) batteries generally based on AB5 or similar compounds that make use of rare earth elements. The high cost of these elements makes it necessary to look for other alternatives that are more readily available and of low cost. It is also desirable to aim for materials that would have discharge capacity higher than roughly 350 mAh/g, which is typical of AB5 compounds. Magnesium-based hydrogen storage alloys have attracted considerable attention as a...
Simulation of a non-premixed swirl burner
Solmaz, Mehmet Burak; Uzol, Oğuz; Uslu, Sıtkı; Department of Aerospace Engineering (2014)
Flame stabilizing in a gas turbine combustion chamber is one of the designing issues. Non-premixed swirling flames are commonly applied to aerial vehicles’ combustors due to their advantages in flame stabilizing and flame length shortening. However, swirling flows are very complex and hard to simulate even without reaction. Previous studies have showed that Large Eddy Simulation (LES) is able to predict swirling flow with a good degree of accuracy. On the other, it is quite expensive and is still far away f...
Investigation of structural and electronic properties of ZnCdTe ternary alloy nanostructures
Kurban, Mustafa; Erkoç, Şakir; Department of Physics (2016)
Nanostructures, including II-VI compound semiconductors, have attracted enormous attention in a wide range of applications of nanotechnology due to the unusual mechanical, electrical and thermal properties under varying size, geometry, temperature and pressure when compared to corresponding bulk materials. However, these properties are not directly measurable by experiments because of the methods or the availability of the experimental tools, so theoretical models and computations play an important role in ...
Citation Formats
H. Aygün, “Investigation of mottling in radiography of directionally solidified ni-based alloy gas turbine blades,” Ph.D. - Doctoral Program, Middle East Technical University, 1996.