DETERMINATION OF AVERAGED AXISYMMETRIC FLOW SURFACES ACCORDING TO RESULTS OBTAINED BY NUMERICAL SIMULATION OF FLOW IN TURBOMACHINERY
Abstract
In the increasing need for energy saving worldwide, the designing process of
urbomachinery, as an essential part of thermal and hydroenergy systems, goes in
he direction of enlarging efficiency. Therefore, the optimization of
urbomachinery designing strongly affects the energy efficiency of the entire
ystem. In the designing process of turbomachinery blade profiling, the model of
xisymmetric fluid flows is commonly used in technical practice, even though this
odel suits only the profile cascades with infinite number of infinitely thin blades.
he actual flow in turbomachinery profile cascades is not axisymmetric, and it can
e fictively derived into the axisymmetric flow by averaging flow parameters in the
lade passages according to the circular coordinate. Using numerical simulations
f flow in turbomachinery runners, its operating parameters can be preliminarily
etermined. Furthermore, using the numerically obtained flow parameters in the
lade passages, averaged axisymmetric flow surfaces in blade profile cascades
an also be determined. The method of determination of averaged flow parameters
nd averaged meridian streamlines is presented in this paper, using the integral
ontinuity equation for averaged flow parameters. With thus obtained results,
very designer can be able to compare the obtained averaged flow surfaces with
xisymmetric flow surfaces, as well as the specific work of elementary stages,
hich are used in the procedure of blade designing. Numerical simulations of flow
n an exemplary axial flow pump, used as a part of the thermal power plant
ooling system, were performed using Ansys CFX.
Dates
- Submission Date2012-04-26
- Revision Date2012-06-25
- Acceptance Date2012-07-05
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Volume
16,
Issue
12,
Pages577 -591