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Article
Fluidics Thrust Vectoring Using Co-Flow Method

Authors: Ali Abdul Almuhsen Al-Asady --- Ahmed Mujahid Abdullah
Journal: AL-NAHRAIN JOURNAL FOR ENGINEERING SCIENCES مجلة النهرين للعلوم الهندسية ISSN: 25219154 / eISSN 25219162 Year: 2017 Volume: 20 Issue: 1 Pages: 5-18
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Computational and experimental investigations of thrust vectoring using co flow method had been carried in the present work. The experimental investigation included design and construction of rig with rectangular duct with aspect ratio (4.4) in order to investigate the effect of various geometric variables on thrust vectoring angle. Set of experiments tests carried out over the mass flow ratio ((ms) ̇⁄(mp) ̇ ) range 0 ≤ (ms) ̇⁄(mp) ̇ ≤ 0.23, gap height h/H= (0.0294, 0.0588, 0.088 and 0.1176) and coanda surface diameter Φ/H= (1.176, 2.353 and 3.529). Load measurements were obtained using four load cells. The computational investigation involved a 3D numerical solution by FLUENT 6.3.26 Software for some of experimental cases. The results show that the increase in secondary jet blowing rate lead to increase the jet vectoring angle, there are three zone can be observed, dead zone appears at low mass flow ratios, then followed by control region in which continuous thrust vector control can be achieved followed by a saturation region. The coanda surface diameter determines the length of the dead zone, which a small coanda surface used for coanda effect resulted in a prolonged dead zone range and the secondary gap height to the primary gap height had inverse relation with jet vectoring angle. The investigation shows that both the experimental and computational results obtained follow a similar trend line.


Article
Effect of Low Co-flow Air Velocity on Hydrogen-air Non-premixed Turbulent Flame Model

Author: Noor Mohsin Jasim
Journal: Journal of University of Babylon مجلة جامعة بابل ISSN: 19920652 23128135 Year: 2017 Volume: 25 Issue: 5 Pages: 1803-1813
Publisher: Babylon University جامعة بابل

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Abstract

The aim of this paper is to provide information concerning the effect of low co-flow velocity on the turbulent diffusion flame for a simple type of combustor, a numerical simulated cases of turbulent diffusion hydrogen-air flame are performed. The combustion model used in this investigation is based on chemical equilibrium and kinetics to simplify the complexity of the chemical mechanism. Effects of increased co-flowing air velocity on temperature, velocity components (axial and radial), and reactants have been investigated numerically and examined. Numerical results for temperature are compared with the experimental data. The comparison offers a good agreement. All numerical simulations have been performed using the Computational Fluid Dynamics (CFD) commercial code FLUENT. A comparison among the various co-flow air velocities, and their effects on flame behavior and temperature fields are presented.

الهدف من هذا البحث هو لتوفير المعلومات المتعلقة بسرعة الهواء الجانبية وتاثيرها على اللهب المضطرب الغير مختلط داخل محرق بسيط, حيث تم تنفيذ محاكاة عددية لاحتراق لهب مضطرب وغيرمختلط الى الهيدروجين-الهواء. أن نموذج الاحتراق المستخدم لغرض التحقيق يقوم على اساس الجمع بين التوازن الكيمائي والحركي لتبسيط الصعوبة في ميكانيكية التفاعل الكيميائي. تأثير زيادة سرعة الهواء الجانبية على درجة الحرارة وسرعة اللهب المحورية والدائرية وعلى المتفاعلات تمت دراستها بشكل عددي ومبين. النتائج العددية المستحصلة من البرنامج قورنت مع النتائج العملية لغرض اثبات الحل وصحته والنتائج تشير الى تطابق جيد. كل الحالات المنفذة في هذا البحث تمت باستخدام برنامج فلونتFLUENT . ألمقارنة المستخدمة لبيان تاثير سرعة الهواء الجانبية على تصرف اللهب وعلى مجال درجة الحرارة قد قدم في هذا البحث.

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