TR-Dizin İndeksli Yayınlar Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12573/396
Browse
3 results
Search Results
Article Öndeki Aracın Akışına Maruz Kalan Otobüsün Üzerinde Oluşan Aerodinamik Etkinin Sayısal Olarak İncelenmesi(2023) Koca, Kemal; Ozden, MustafaIn this study, the aerodynamic characteristics of buses which were convoy position were numerically investigated at different speeds when they were exposed to headwind. As the numerical attempt, the commercial FloEFD software with education version was utilized. Velocity, turbulent energy dissipation contours as well as drag coefficient (CD) graph were provided as the result of numerical simulation. As the flow visualizations, velocity and turbulent energy dissipation contours clearly pointed out that headwind caused the front part of the first bus to have higher pressure. Additionally, flow separations and vortex structures were observed at the sides of the first bus. The effects and size of these flow structures increased when bus speed increased. After a while, it was observed that the vortices induced flow separation belonging to first bus hit the second bus which was trying to overtake. In what follows, CD graph obviously indicated that the vortices induced flow separation of first bus caused the drag coefficient of the second bus to boost approximately 3% when it was trying to overtake the first bus.Article Citation - WoS: 1GIS-AHP Approach for a Comprehensive Framework to Determine the Suitable Regions for Geothermal Power Plants in Izmir, Turkiye(Konya Teknik Univ, 2024-02-15) Koca, Kemal; Karipoglu, Fatih; Ozturk, Emel ZerayGeothermal energy is gaining more reputation and importance around the world. Correspondingly, suitable location selection is a critical step and has become necessary for the successful installation and operation of geothermal power plants. This study investigated suitability of & Idot;zmir region, located in the Aegean part of T & uuml;rkiye, in terms of geothermal power plants applications by using the combination of Geographical Information System and Analytic Hierarchy Process. Based on the request of power plants, thirteen important criteria were evaluated under three main categories named as physical (C1), environmental (C2) and technical (C3). Moreover, expert's opinions were taken into consideration to calculate the importance of these criteria. Key results showed that & Idot;zmir was suitable for geothermal power plants. The final suitability map layer pointed out that %8.73 (1.037 km2) of total area were determined as highly suitable regions in terms of installation. In addition, the obtained suitability map layer was compared with actual geothermal power plants. Based on the comparison study, power plants in Seferihisar were moderately suitable for geothermal power plants while the location of Bal & ccedil;ova power plant was highly suitable. Regarding the suitability assessment in the present study, the location of Dikili power plants had the least suitability score.Article Flow Properties of an Ahmed Body with Different Passive Flow Control Methods(2024-03-25) Koca, Kemal; Ozden, MustafaAhmed Gövdesinin eğimli yüzeyinde ve iz bölgesinde oluşan akış topolojisini pasif akış kontrol teknikleri ile ve pasif akış kontrol teknikleri olmadan incelemek amacıyla FloEFD yazılımı kullanılarak sayısal bir simülasyon gerçekleştirilmiştir. Bu akış kontrolörlerinin akış topolojisini ve aerodinamik sürükleme katsayısını etkileyerek eğik yüzey ve iz bölgesindeki akış üzerindeki etkileri dikkatle incelenmiştir. Sayısal bulgular, sürükleme azaltımı açısından en iyi performansın, Ahmed Gövdesinin eğimli yüzeyinin arka kısmında küre ve yarı küresel şekilli akış kontrol teknikleri uygulandığında elde edildiğini açıkça ortaya koymuştur. Eğimli yüzeyin arka kısmında konumlandırılan küresel ve yarı küresel şekilli akış kontrolörleri, sırasıyla %6 ve %7 oranında sürtünme azalmasına yol açtı. Ayrıca mevcut çalışmanın sonuçları literatürde yayınlanmış çalışmalardan elde edilen sonuçlarla karşılaştırılmıştır. Farklı yazılımlarla bulunsalar da birbirleriyle tutarlı oldukları açıkça görüldü.