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Article
Design and Analysis of A 3-D Conical Diffuser

Author: Arkan K. Husain Al Taie
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2007 Volume: 25 Issue: suppl.of No.3 Pages: 443-453
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Analysis of flow through the conical diffuser of an annular combustion systemis presented. The flow is assumed to be unsteady, quasi three dimensional,compressible and turbulent. A k-ε model was used to simulate turbulence.Several area ratios and divergence angles were tested until circulation tookplace. At this angle a snout was introduced to correct the flow. A control volumemethod was used to solve the differential equations of the flow to obtain velocityand pressure coefficient distributions. The numerical results show that the axialvelocity decreases with diffuser length for a certain divergence angle. But itincreases with angle of divergence for the same area ratio, while the radialcomponent of velocity was found to increase with both. It was proved that thesnout can correct the flow whenever circulation takes place.

يتم استعراض تحليل الجريان خلال ناشر مخروطي لغرفة احتراق طوقية. تم افتراض الجريان(k - ε) غير مستقر، مقرب الى ثلاثي الابعاد، انضغاطي و مظطرب. تم استخدام نموذجللاظطراب. تم تجربة العديد من نسب المساحة و زوايا الانفراج وحتى حصول الدوران. عندهذه الزاوية تم استخدام (سنوت) لتصحيح الجريان. استخدمت طريقة حجم السيطرة لحلالمعادلات التفاضلية للجريان للحصول على توزيع السرعة ومعامل الضغط. ان النتائج تبيننقصان السرعة المحورية مع طول الناشر لزاوية انفراج معينة. ولكنها تزداد مع زاوية الانفراجلنسبة مساحة معينة. بينما مركبة السرعة الشعاعية وجدت انها تزداد مع الاثنين. وتمالتحقق من ان استخدام ال (سنوت) يصحح الجريان اينما يحدث الدوران.[كلمات مفاتيح: ناشر، غرف الاحتراق ، السنوت].

Keywords

combustors --- diffusers --- snout


Article
Stress Evaluation of Low Pressure Steam Turbine Rotor bBlade and Design of Reduced Stress Blade

Author: Arkan K. Husain Al-Taie
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2008 Volume: 26 Issue: 2 Pages: 169-179
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The low pressure steam turbine blade rows have a history of stress failure . They suffer fromtensile and bending stresses partly due to the centrifugal force as a result of high rotationalspeeds and partly due to high pressure, temperature and speed steam loading. The centrifugalforce is one of the problems that face the designers of turbine blades especially the long ones.The designer always aims at reducing these stresses. One way to do so is by the reduction of blademass. That is to make the blade of variable cross section stead in of straight. This paper presentsthe method of reducing cross section. Analysis of such blade is also done as applied to the (P 23-14A) steam blade.

Keywords

Steam Turbines --- Design --- Stress

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