Download CFturbo 10

Impeller
261
Information
In the right panel of the tab sheet Parameter some variables are displayed for Information:
actual Power PD
PD = PQ·η ttSt
Power loss PL
PL = PQ - PD
calculated with total density in the outlet:
Flow Qt
Qt
m
t2
Pressure ratio total-total
tt
Pressure ratio total-static
ts
Efficiency total-total
η tt
Efficiency total-static
η ts
Isentropic velocity ratio
ts
u1
2 h ttis
In general for cost reasons single-stage & single-intake machines are preferred covering a range of
about 10 < nq < 400. If especially high specific speed values (nq > 400) do occur one can reduce
rotational speed n or mass flow rate ? if feasible. Another option would be to operate several singlestage turbines - having a lower nq - in parallel.
Please note: CFturbo® is preferably used between 100 < nq < 400 – axial rotors.
8.1.5.3
Dimensions
The main dimensions of a rotor - inlet diameter dS1 and dH1 and outlet diameter
dS2 and dH2 - can be seen on Main dimensions panel. They can be recomputed
by pressing the Calculate-button. The computation is based on "Euler's
Equation of Turbomachinery", on the continuity equation and the relations for the
velocity triangles as well as on the parameters and parameter ratios given in the
tab sheets Setup and Parameters.
© CFturbo Software & Engineering GmbH