where Ad is draft tube cross-sectional area at its outlet (Section 3 in Fig. 2). The expression inside the brackets in Eqs. (2) and (4) is dimensionless and it is denoted herein as
where Ad is draft tube cross-sectional area at its outlet (Section 3 inFig. 2).The expression inside the brackets in Eqs. (2) and (4) isdimensionless and it is denoted herein as