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Article
A Comparative Study on the Performance Augmentation of a Gas Turbine Power Plant

Authors: Abdullateef A. Jadallah --- Adil A. Al-Kumait
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2016 Volume: 23 Issue: 1 Pages: 1-9
Publisher: Tikrit University جامعة تكريت

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Abstract

In the present work, a comparative performance analysis of the gas turbine power plant with and without power augmenting devices was carried out. The intercooler, turbine burner (reheater), and heat exchanger were inserted individually and together to reveal the effect of each device. A model for each addition was derived on the base of the simple cycle and adapted to reflect the effect of the performance parameters on the plant power and thermal efficiency. The heat exchanger with different effectiveness improves the thermal efficiency but for low pressure ratios, while the intercooler has low effect at low pressure ratios. Its effect increases with increasing of this ratio and this needs advanced materials. The intercooler cooling percent was considered as 50%, 75% and 100%. The use of turbine burner alone augments the output power by 19.4% but on the expense of thermal efficiency (dropped by 4%) and fuel price. The interstage compressor cooling augments the power by 1.3%, while the efficiency increases slowly and needs a large amount of compression. The combination of intercooling with turbine burner enhances the power by 13.4%. So the regeneration must be installed with them to ensure an enhancement in plant compatibility and thermal efficiency.


Article
Numerical Investigation on the Performance of an External Compression Supersonic Air Intake Using By-Pass Technique
تفسير عددي لأداء آخذة هواء فوق صوتية ذات انضغاط خارجي باستخدام تقنية تمرير الهواء

Authors: Jalal M. Jalil --- Abdullateef A. Jadallah --- Ahmed F. Mahdi
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2013 Volume: 31 Issue: 6 Part (A) Engineering Pages: 1011-1025
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Two-dimensional, supersonic flow field computation with by-pass holes has been conducted using Euler equation. An algorithm based on finite difference McCormack's technique is used to solve the subsonic-supersonic flow problem with and without by-passing. Trials on by-pass locations were also made. Operation without bypass shows the movement of the normal shock wave upstream which refers to an off-design operating regime. At a distance of 1.271 m measured from the cowl lip, the region of normal shock wave was localized near the throat which approximately represents the on-design perform 0ance condition (cells 8-9). When the flow is bypassed from the rear passages, the normal shock wave is sucked inside the flow passage save poor performance. Results show that by-passing provides a fast reaction to maintain a steady performance which meets the requirements of on-design operation. The Mach number variation corresponding to each case is presented. Results show that the tendency to unity Mach number near the cowl lip sector can be achieved using by-pass expelled. The influence of by-pass on the total pressure recovery and relative pressure is also discussed.

تناول هذا البحث مناقشة عددية لأداء آخذة هواء ثنائية الابعاد باعتماد تقنية تمرير الهواء. تم استخدام خوارزمية تعتمد الفروقات المحددة تقنية McCormack لحل الجريان الفوق صوتي بدون ومع تمرير الهواء خارج الآخذة لأثبات تأثير تقنية التمرير اختبرت منافذ متعددة لتمرير الهواء لمسايرة اداء الاخذة للوصــول الى الاداء التصميمـي. للهيكلية المعتمدة, المنفذ الذي يبعد على مسافة 1.712 m من مقدمة المخروط اعطى احسن اداء بإيصال عدد ماخ الى واحد عند منطقة العنق وللخلايا (8-9). كلما ابتعدت منافذ التمرير فان الموجة الصدمية تنسحب داخل الاخذة مؤدية الى اداء سيء للآخذة. أظهرت النتائج ان تقنية تمرير الهواء هي وسيلة سريعة لإعادة أداء الآخذة الى النظام المستقر وقد أضيف تاثير التمرير على نسبة استرداد الضغط الكلية للآخذة.


Article
Performance Enhancement of a Darrieus Vertical Axis Wind Turbine using Divergent Ducting System

Authors: Abdullateef A. Jadallah --- Sahar R. Farag --- Jinan D. Hamdi
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2018 Volume: 25 Issue: 3 Pages: 58-66
Publisher: Tikrit University جامعة تكريت

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Abstract

Ducting system is an effective way to potentially augment the performance of wind turbine for applications in building architectures. This paper is aimed to study one of the possible enhancement method of the vertical axis wind turbine performance. It is characterized by adding divergent duct to facilitate imparting more flow rate. The divergent duct was designed and adapted with wind turbine. The system was modelled and simulated analytically and numerically. A computer program built in MATLAB 16 to simulate the performance of system. The performance and flow are also solved numerically using ANSYS-FLUENT 17.2. Two opening angles of the divergent -duct were employed to study the behavior of air flow through divergent duct and results were compared with base vertical axis wind turbine. The duct turbine with a straight wall type diffuser demonstrate power coefficient augmentation by 24.2% and 9.09% for opening angle 20° and 12° respectively. The optimum half opening angle was attained for the diffuser. The diffuser’s length of a half of the throat opening is recommended, and its angle of opening is 20°. The diffuser was located in a stream-was direction that adequately aligned with the center of the vertical axis wind turbine. Results showed a reasonable influence on the performance of wind turbine. This technology may be used in gates and in urban areas with a relatively low wind speed regime.


Article
Effect of Colored Filters on PV Panels Temperature and Performance under Baghdad Meteorological Condition
تأثير الفلاتر الملونة على حرارة واداء االلواح الكهروضوئية تحت الظروف الجوية لمدينة بغداد

Authors: Abdulmunem R. Abdulmunem --- Abdullateef A. Jadallah --- Hisham A. Hoshi --- Mohammed H. Jabal
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2018 Volume: 25 Issue: 4 Pages: 46-50
Publisher: Tikrit University جامعة تكريت

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Abstract

In this work, the influence of colors of filters upon the photovoltaic panels rising temperature and electrical performance was studied under Baghdad Meteorological Condition. Basing on the energy analysis of a photovoltaic solar system and by using the photonic theory, the available energy on the PV plane system has been evaluated. Seven colored filters each with (85W) PV modules were used in this case study, to reveal the impact of colored filters upon the electrical productivity of PV panel with the variation in the temperature caused by these filters. There is themain issue of this work is to show how the performance of PV module by imposing colored filter and hence how and to how much improve it by reducing the cell temperature in hot climate. Outcomes showed that the PV technology is affected by the color filters. In other words, red filter gives light have least photons energy, and violet filter gives light have the most photons energy and green is between the two. So, red colors filter gives highest PV panel temperature comparative with others filters, while violet color filter was the lowest. PV module with the lowest temperature colored filter gives the best electrical performance than others.

في هذا العمل، تمت دراسة تأثير ألوان الفالتر على ارتفاع درجة حرارة واألداء الكهربائي لأللواح الكهروضوئية تحت الظروف الجوية لمدينة بغداد . على أساس تحليل الطاقة لنظام الطاقة الشمسية الضوئية وباستخدام النظرية الفوتونية، تم تقييم الطاقة المتاحة على نظام اللوح الكهروضوئي .تم استخدام سبعة فالتر ملونة مع كل نموذج كهروضوئي )85 واط( في هذه الحالة الدراسية، للكشف عن تأثير الفالتر الملونة على إنتاجية األلواح الكهروضوئية الكهربائية مع التغير في درجة الحرارة التي تسببها هذه الفالتر. القضية الرئيسية لهذا العمل هو إظهار كيفية أداء النموذج الكهروضوئي عن طريق فرض الفلترة الملونة وبالتالي كيف وإلى اي مدى يتم التحسين عن طريق خفض درجة حرارة الخلية في المناخ الحار .أظهرت النتائج أن التكنولوجيا الكهروضوئية تتأثر بالفالتر الملونة . وبعبارة أخرى، الفلتر األحمر يعطي ضوء له أقل طاقة فوتونية، ويمنح الفلتر البنفسجي ضوء له اعلى طاقة فوتونية واالخضر بين االثنين. لذا ، الفلتر األحمر اللون يعطي أعلى درجة حرارة للوح الكهروضوئي مقارنة مع بقية الفالتر ، بينما كان الفلتر البنفسجي اللون هو األقل. النموذج الكهروضوئي مع الفلتر الملون االقل درجة حرارة يعطي أفضل أداء كهربائي من البقية.


Article
Performance Augmenting of a Vertical Axis Wind Turbine using Adaptable Convergent Ducting System
تعزيز أداء التوربين الريحي عمودي محور الادارة باستخدام منظومة معبر هواء تقاربي

Authors: Abdullateef A. Jadallah عبد اللطيف أحمد جاد الله --- Sahar R. Farag سحر راضي فرج --- Jinan D. Hamdi جنان دخيل حمدي
Journal: Al-Khwarizmi Engineering Journal مجلة الخوارزمي الهندسية ISSN: 18181171 23120789 Year: 2018 Volume: 14 Issue: 3 Pages: 141-148
Publisher: Baghdad University جامعة بغداد

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Abstract

Developments are carried out to enhance the performance of vertical axis wind turbines (VAWT). This paper studies the performance of the ducted wind turbine with convergent duct (DAWT). Basically, the duct technique is utilized to provide the desired wind velocity facing the turbine. Methodology was developed to estimate the decisive performance parameter and to present the effect of the convergent duct with different inlet angles. The ducted wind turbine was analyzed and simulated using MATLAB software and numerically using ANSYS-Fluent 17.2. Result of both approaches were presented and showed good closeness for the two cases of covering angles 12° and 20°, respectively. Results also showed that the convergent duct with an inlet angle 12° and 20° improved the coefficient of performance at a specified tip speed ratio by 25.8% and 33.33% respectively in the productivity of wind turbine.

أجريت دراسات عديدة لتحسين اداء التوربين الريحي العمودي. تناول هذا البحث دراسة تحسين اداء التوربين الريحي عمودي محور الادارة باستخدام معبر هوائي تقاربي. تم تطويع منهجية رياضية تحليلية وعددية باستخدام ANSYS 17.2 لتمكين حساب معامل القدرة والعزم والمتغيرات الحاكمة الاخرى باستخدام زاويتين لمعبر الهواء وبواقع 12ه و 20ه . ان استخدام المعبر بالزاويتين المذكورتين آنفا حقق زيادة في معامل القدرة بواقع 25.8% و 33.33% على التوالي. تم تمثيل تصرف الجريان وحساب معامل القدرة من الحل العددي ومقارنته بنتائج الحل التحليلي واظرهت تطابقا جيدا.


Article
PERFORMANCE EVALUATION OF THE VERTICAL AXIS WIND TURBINE WITH VARIOUS ROTOR GEOMETRIES
تقييم أدآء التوربين الريحي عمودي المحور بهيكليات دوار مختلفة

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Abstract

Performance evaluation of a designed and fabricated vertical axis wind turbine (VAWT) are revealed in this work. Six different geometries of the VAWT rotors were designed and manufactured. These geometries are: two straight bladed (2HB) VAWT, three straight bladed (3HB) VAWT, Savonius rotor (SI), Savonius rotor (SII), Savonius rotor (SIII) and Savonius rotor (SIIII). The Blades are manufactured from beech wood using CNC machines then they subjected to different processes to improve its aerodynamic performance. Savonius blades are merged with the straight blades rotor to improve the self-starting ability of the VAWT. A fan of (0.8 m and 2000 rpm) is installed to blow air with the required speed ranged from (0-12 m/s) A conducting duct is designed and constructed to conduct the flow with reasonable uniformity. All geometries are tested under different operating condition to predict the performance of the designed VAWT. Number of blades (N), chord length (c), radius (R), and blade pitch angle (β), are studied to evaluate the performance of the VAWT. Double multiple stream tube methodology is used to study these parameters. To do so, a computer code written in Matlab is built. Results show that the performance is highly affected by the design parameters. Theoretical results are compared with the experimental data. A good agreement is obtained.

تناول البحث تقييم أدآء توربين ريحي مصمم ومصنع بستة هيكليات وهي بريشتين مستقيمة (2HB), ثلاثة ريش(3HB), وتوربين سافينس بثلاثة هيكليات: تقليدي, بريشتين وبثلاثة ريش. تم تصنيع الريش باستخدام ماكنة ال CNC ووضعت مروحة بقطر 80 سم وسرعة دوران 2000 د/دقيقة لتامين الرع المطلوبة. لايصال الرياح بشكل منتظم تم اضافة منفث. أختبرت الهيكليات من حيث تأثرها بعدد من المتغيرات الحاكمة مثل عدد الريش, طول الريشة وزاوية الخطوة. أنشئ برنامج بلغة ال Matlab لحساب الاداء. قورنت النتائج النظرية والعملية واظهرت تقاربا جيدا.

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