Analysis of the flow through a Francis' turbine runner using computational fluid dynamics

الموضوعات

علوم بحتة وطبيعية

الملخص

This study investigates the fluid flow through the runner of an exceptionally low specific speed Francis’ turbine using computational fluid dynamics (CFD) to predict some performance characteristic of the runner, and to determine the effect of cavitation on the flow features within the turbine. It employs FLUENT CFD codes for the analysis. The study was carried out under steady conditions in two- dimensional analysis, primarily using the RNG k-ε turbulence model. It is mainly on single phase analysis; however a single case of two-phase cavitation modeling was performed in order to evaluate cavitation effects.The hydraulic losses were much dependent on the inlet flow velocity and less dependent on the rotational speed. Cavitation occurred throughout the flow domain and this led to non-physical negative pressure predictions for the single phase analysis. For a fixed discharge, cavitation had significant effect on the prediction of the torque and hence the runner efficiency obtained from the CFD analysis. It causes a significant reduction of the runner efficiency by increasing the hydraulic losses and should be considered in the analysis of the flow features within a runner which is likely to experiences cavitation in order to overcome some of the shortcomings of the single phase predictions.

روابط وملفات

التعريف والنوع

رقم الوثيقة

0f5eff64-0625-4ed9-9b4f-bda4af0a76ee

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf image

أسماء الملفات

0f5eff64-0625-4ed9-9b4f-bda4af0a76ee_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":"Amr Serag El Din","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"Ashraf Sabry","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"Lamyaa El-Gabr","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"William Anthony","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

English

المصدر والدورية

اسم المصدر

Analysis of the flow through a Francis' turbine runner using computational fluid dynamics

المحتوى والصفحات

عدد الصفحات

0

إشراف وإعداد

الإشراف

Amr Serag El Din, Ashraf Sabry, Lamyaa El-Gabr

الإعداد

William Anthony

الاقتباسات الببليوغرافية