Critical submergence for isolated and dual rectangular intakes

Abstract

This study examined critical submergence for isolated and dual rectangular intakes. It is shown that the critical submergence for an isolated intake can be predicted by disregarding whole boundary blockages on the complete imaginary critical sink surface that is the combination of imaginary complete critical cylindrical and hemi-spherical sink surfaces. It is proposed that this theory can be applied to the rectangular intakes located in general geometrical and flow conditions (i.e., intake in still water, circulation imposed flow, non-developed cross-flow, multiple intakes, etc.) and that it does not require computation of blockages caused from flow boundaries. The concept of complete sink surface (disregarding whole boundary blockages) developed for an isolated intake was also applied to dual rectangular intakes. The agreement between available test data and theoretical results was found to be satisfactory.

Prediction of critical submergence in a two-layer-stratified fluid flow

“…Yıldırım and Kocabaş [12] proved that V s is a constant for the given flow and geometrical conditions. Taştan and Yıldırım [13] and Taştan [14] indicated that an imaginary complete critical sink surface (neglecting all kinds of boundary blockages) can also be used for the prediction of critical submergence of a pipe intake as presented in Eq. (6).…”

Su alma ağzı giriş şeklinin hava girişli çevrinti üzerindeki ölçek etkisi

“…Eroğlu ve Bahadırlı[17], Yıldırım[10]'ın dikdörtgen ağızlara ait kritik batıklığın hesaplanması için potansiyel akım yaklaşımı neticesinde bulduğu kritik küresel kuyu yüzeyinin yarıçapını, akım ortamında oluşan Rankine şeklinin duraklama noktasının ağza mesafesine eşit kabul eden başka bir kritik küresel kuyu yüzeyi kullanarak hesaplamışlardır. Taştan[18], kanal akımı içerisine yerleştirilmiş tek ve ikili dikdörtgen su alma ağızlarına ait kritik batıklığı deneysel ve teorik olarak incelemiştir. Yang ve ark [19].…”