يتناول هذا البحث الدراسة التجريبية التي تتضمن تحسين شروط الجريان في حجرة
الامتصاص المفتوحة و المزودة بمضخة محورية أو مختلطة و أنبوب امتصاص شاقولي،
بحيث يؤمن ذلك تخفيض عمق الماء الأدنى اللازم للامتصاص في الحجرة. و قد تم
دراسة نموذج لحجرة مستطيلة الشكل بمقياس 1\10، وفق نموذج فراود، من خلال
إضافة ثلاثة تعديلات على تصميم الحجرة، تشمل إضافة العنصر الطافي، و اضافة
العنصر المخروطي، و التعديل الثالث يجمع العنصرين معاً. و تمت مراقبة الجريان
لملاحظة تشكل الدوامات سواء كانت سطحية أو تحت سطحية، كما تم قياس الضغط
عند ثمانية نقاط موزعة بالتساوي على محيط أنبوب الامتصاص في المقطع قبل دولاب
المضخة، بالإضافة لقياس درجة التدوم عند هذا المقطع أيضاً. و قد بينت نتائج البحث أن
إضافة العنصر الطافي خلف أنبوب الامتصاص في الحجرة، هي الطريقة الأنسب
و الأجدى لتخفيض عمق الغمر في الحجرة، بما لا يؤثر سلباً على المعابير الهيدروليكة
الأخرى التي تحكم مدى انتظام الجريان نحو أنبوب الامتصاص ضمن الحجرة.
This research presented the experimental study of improving flow
conditions in pump-sump provided with an axial or mixed pump, and
vertical suction pipe, to ensure reducing the minimum needed
submergence of the sump. A physical model of rectangular shaped pumpsump
had been studied, with a scale 1\10 , according to Froude Model.
Three modifications had been added, including: floating element, conical
element, and the third one consists of both of them. The flow had been
watched for vortices observation whether surface or subsurface.
Piezometric pressures had been measured at eight points, distributed
equally on the suction pipe perimeter near pump impeller, in addition to
swirl degree measure near pump impeller too. The results showed that the
floating element, set behind the suction pipe, is the most appropriate and
most effective solution to reduce the submergence in pump-sump in way
which the other hydraulic criterions, which control the flow stability
towards the suction pipe in the sump, don't be affected negatively.
References used
ANSI/HI 9.8, 1998 - American National Standard for Pump Intake Design. Hydraulic Institute, Parsippany, New Jersey
Shbaayek, S, 2010 - Improving Approach Flow Hydraulic At Pump Intakes. International Journal Of Civil & Environmental Engineering, IJCEE-IJENS Vol: 10 No:06, p.27-29
Samir A. S. Ibrahim, 2011 – Evaluation of Flow Characteristics In The Intake Structure And Pump Sump Using Physical Model. Nile Basin Water Science & Engineering Journal, Vol.4, Issue 1, P.45-48
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