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Recent Submissions

Understanding mechanical failure of graphite rocket nozzle throats under thermal stresses
Nigar, Barış; Dönmez, Serhan; Çöker, Demirkan; Özerinç, Sezer (2021-12-01)
© 2021 Elsevier Masson SASMechanical failure of graphite nozzle throats is a common problem of rocket engines. The extreme operating conditions constitute the main cause of the problem, resulting in thermal shock-induced c...
The influence of flow forming on the precipitation characteristics of Al2024 alloys
Karakaş, Aptullah; Fenercioğlu, Tevfik Ozan; Yalçınkaya, Tuncay (2021-09-15)
Aluminum alloys are heat treated for better specific strength. In certain cases, an intermediate cold work is applied between solution heat treatment and aging. In this study, a specific tube forming technique called flow ...
Aerodynamic Optimization of a Swept Horizontal Axis Wind Turbine Blade
Kaya, Mehmet Numan; Kose, Faruk; Uzol, Oğuz; Ingham, Derek; Ma, Lin; Pourkashanian, Mohamed (2021-09-01)
The aerodynamic shapes of the blades are still of high importance and various aerodynamic designs have been developed in order to increase the amount of energy production. In this study, a swept horizontal axis wind turbin...
Computational-Experimental Design Framework for Laser Path Length Controller
Fenercioglu, Tevfik Ozan; Yalçınkaya, Tuncay (2021-08-01)
The application areas of piezoelectric materials are expanding rapidly in the form of piezo harvesters, sensors and actuators. A path length controller is a high-precision piezoelectric actuator used in laser oscillators, ...
Improvement in the spring analogy mesh deformation method through the cell-center concept
Yang, Yosheph; Özgen, Serkan; Kim, Haedong (2021-08-01)
The mesh deformation method is an important topic in studies involving moving boundary problems. As one of the main approaches, this method has been applied in various related studies. To address the cell inversion problem...
2D and 3D simulations of dynamic delamination in curved unidirectional CFRP laminates subjected to moment/axial combined loading
Ata, Tamer Tahir; Çöker, Demirkan (2021-07-15)
© 2021 Elsevier LtdDynamic failure of 30-ply curved unidirectional CFRP laminate under quasi-static moment/axial combined loading used in the experiments of Tasdemir (2018) is investigated numerically. 2D and 3D explicit f...
Conjugate Analysis of Silica-Phenolic Charring Ablation Coupled with Interior Ballistics
Alanyalioglu, Cetin Ozan; Özyörük, Yusuf (2021-07-01)
Because of its excellent insulation capability, the usage of a silica-phenolic charring ablator as a nozzle liner is a common practice in the solid rocket motor industry. During the design of a solid rocket motor employing...
Investigation of a rotor blade with tip cooling subject to a nonuniform temperature profile
Kahveci, Harika Senem (2021-07-01)
© 2021 by ASME.One of the challenges in the design of a high-pressure turbine blade is that a considerable amount of cooling is required so that the blade can survive high temperature levels during engine operation. Anothe...
Effect of hydrogen jets in supersonic mixing using strut injection schemes
Jeyakumar, S.; Kandasamy, Jayaraman; Karaca, Mehmet; Karthik, K.; Sivakumar, R. (2021-06-28)
© 2021 Hydrogen Energy Publications LLCThe prevalence of complex phenomena associated with the fuel mixing of a supersonic stream in scramjet combustor is inherently occurred due to the short residence time. An efficient i...
Experimental investigation of tip anhedral effects on the aerodynamics of a model helicopter rotor in hover
Uluocak, Sinem; Perçin, Mustafa; Uzol, Oğuz (2021-06-01)
© 2021 Elsevier Masson SASThis study experimentally investigates the effects of tip anhedral on the rotor aerodynamic performance and the tip vortex characteristics in hovering flight. A five-bladed scaled helicopter rotor...
Long term and safe relative orbit design for heterogeneous spacecraft clusters
Yaglioglu, Burak; Tekinalp, Ozan (2021-06-01)
© 2020 COSPARThe problem of obtaining long term relative orbit configurations for spacecraft clusters with realistic operational considerations such as safety, station keeping and inter-spacecraft distances is addressed. T...
Effects of inflow boundary layer on the wake of a radially non-uniform porous disk
Abdulrahim, Anas; Akpolat, M. Tuğrul; Hassanein, Abdelrahman; Perçin, Mustafa; Uzol, Oğuz (2021-05-01)
© 2021 Author(s).This study presents the results of an experimental investigation focusing on the effects of the inflow boundary layer on the wake characteristics of a 0.12 m diameter porous disk with radially non-uniform ...
A crystal plasticity based finite element framework for RVE calculations of two-phase materials: Void nucleation in dual-phase steels
Yalçınkaya, Tuncay; Çakmak, Serhat Onur; Tekoğlu, Cihan (Elsevier BV, 2021-05-01)
© 2020 Elsevier B.V.A crystal plasticity based finite element (CPFE) framework is developed for performing representative volume element (RVE) calculations on two-phase materials. The present paper investigates the mechani...
Aerodynamic shape optimization of wind turbine blades for minimizing power production losses due to icing
Yirtici, Ozcan; Tuncer, İsmail Hakkı (2021-05-01)
Ice formation on a wind turbine alters the airfoil profiles of the blades and causes degradation in the aerodynamic performance of the wind turbine and the resulting power production losses. Since the blade profile plays a...
Asymmetric vortex shedding in the wake of an abruptly expanding annular jet
Vanierschot, Maarten; Perçin, Mustafa; van Oudheusden, Bas W. (2021-04-01)
© 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.Abstract: In this paper, the structure of the turbulent wake behind the inner tube of a suddenly expanding annular jet...
Numerical investigations on the hydrogen jet pressure variations in a strut based scramjet combustor
Suppandipillai, Jeyakumar; Kandasamy, Jayaraman; Sivakumar, R.; Karaca, Mehmet; Karthik, K. (2021-04-01)
Purpose
Flutter Optimization of a Wing-Engine System with Passive and Active Control Approaches
Asadi, Davood; Farsadi, Touraj; Kayran, Altan (2021-04-01)
In the present study, the flutter performance of a composite thin-walled beam wing-engine system is optimized by implementing two different control approaches: 1) passive open-loop and 2) active closed-loop control. Sequen...
Flutter study of flapwise bend-twist coupled composite wind turbine blades
Farsadi, Touraj; Kayran, Altan (2021-03-01)
Bending-twisting coupling induced in big composite wind turbine blades is one of the passive control mechanisms which is exploited to mitigate loads incurred due to deformation of the blades. In the present study, flutter ...
Development of a procedure to model the mechanical behavior of composites with embedded element method by considering the matrix non-linearity
ŞIK, ALP; Gürses, Ercan; SABUNCUOĞLU, BARIŞ (2021-03-01)
Embedded element method is considered to be a reliable and efficient method to analyze the mechanical behavior of composite materials. However, the predicted behavior of individual constituents can be inaccurate in case th...
In-situ investigation of dynamic failure in [0(5)/90(3)](5) CFRP beams under quasi-static and low-velocity impact loadings
Bozkurt, Mirac Onur; Çöker, Demirkan (2021-03-01)
In this paper, experimental work to investigate the failure sequence in cross-ply CFRP beams under quasi-static and low-velocity impact (LVI) loadings is presented. [0(5)/90(3)](s) CFRP beams with thick clustered plies are...
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