TY - JOUR
TI - Determination of averaged axisymmetric flow surfaces according to results obtained by numerical simulation of flow in turbomachinery
AU - Bogdanović-Jovanović Jasmina
AU - Bogdanović Božidar
AU - Milenković Dragica R
JN - Thermal Science
PY - 2012
VL - 16
IS - 12
SP - 577
EP - 591
PT - Article
AB - In the increasing need for energy saving worldwide, the designing process of  turbomachinery, as an essential part of thermal and hydroenergy systems, goes  in the direction of enlarging efficiency. Therefore, the optimization of  turbomachinery designing strongly affects the energy efficiency of the entire  system. In the designing process of turbomachinery blade profiling, the model  of axisymmetric fluid flows is commonly used in technical practice, even  though this model suits only the profile cascades with infinite number of  infinitely thin blades. The actual flow in turbomachinery profile cascades is  not axisymmetric, and it can be fictively derived into the axisymmetric flow  by averaging flow parameters in the blade passages according to the circular  coordinate. Using numerical simulations of flow in turbomachinery runners,  its operating parameters can be preliminarily determined. Furthermore, using  the numerically obtained flow parameters in the blade passages, averaged  axisymmetric flow surfaces in blade profile cascades can also be determined.  The method of determination of averaged flow parameters and averaged meridian  streamlines is presented in this paper, using the integral continuity  equation for averaged flow parameters. With thus obtained results, every  designer can be able to compare the obtained averaged flow surfaces with  axisymmetric flow surfaces, as well as the specific work of elementary  stages, which are used in the procedure of blade designing. Numerical  simulations of flow in an exemplary axial flow pump, used as a part of the  thermal power plant cooling system, were performed using Ansys CFX. [Projekat  Ministarstva nauke Republike Srbije, br. TR33040: Revitalization of existing  and designing new micro and mini hydropower plants (from 100 kW to 1000 kW)  in the territory of South and Southeast Serbia]