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The 3D_E software system for calculation of gas flow in axial turbomachine.
V.N.Koterov, V.M.Krivtsov, V.M.Zubov, A.V.Shipilin
The software system 3D_E has the aim to simulate the 3D gas flow in
multistage axial turbomachines (turbines, compressors) to give a
researcher the tools for investigating the real features of gas motion
in devices considered. Numerical 3D modeling will allow to receive
additional data to experimental ones and to improve the device working
facilities.
The 3D_E Software System takes into account the given losses of the
full pressure due to some real physical processes and the blowing of a
cooling gas from the surfaces of the turbine blades. It is realized
for IBM PC 486 DX-4-100 (or upper) within MS DOS media. We have also
some version of the System for high efficiency computers with RISC
processors. The computer modeling of the flow is based on 3D Euler
equations with additional terms describing the entropy growth due to
some viscid effects, turbulent mixing or any other dissipated physical
processes. All flows within all channels between the blades of each
blade row (stators or rotors) are considered as the same, that the
process of generation of long wave axial disturbances is ignored (the
last may take plaice in some flow regimes). The governing equations of
gas flow within the interblades channels of stators are written with
the use of motionless system of coordinates and within the interblades
channels of rotors - with the use of rotating one. The numerical
solution for the motionless and rotating regions are joint at the
expense of requirements based on the continuity of the mass, impulse
end energy fluxes. The calculation of these fluxes are carried out
with the use of axial average values. This axial average allows to
avoid the high frequency pulsation of the flow and to reach its
average stationary state (the last - due to numerical iterative
procedure).
The experience of computer simulation shows that the numerical technique
for turbomachine flow modeling must satisfy to some requirements of
accuracy. 3D_E System uses the original implicit finite difference scheme
providing sufficient conservation of mass and other stagnation flow
parameters (such as enthalpy and/or entropy) in the case of inviscid flow and
without blowing.