Resumen
Rotor-stator cavities are often found in turbomachinery; they supply cold air that is bled from the compressor to the turbine blades. The pressure of the outlet of a rotor-stator cavity is axisymmetric under normal circumstances. However, its pressure would be non-axisymmetric in the event of blade fracture. The impact of blade fracture on a rotor-stator cavity with centrifugal superposed flow is studied in this paper. The Euler number E, the rotational Reynolds number ??????
R
e
f
, and the low-pressure zone range ? are investigated and, for the first time, with the non-axisymmetrical boundary conditions employing numerical simulation. The results of the numerical calculations show that after turbine blade fracture, the velocity is more affected in the downstream region at a high radius, especially when the ??????
R
e
f
is large. As for the distribution of the mass flow rate, there may be a critical ????
?
c
at which the other blades are least affected. The ????
?
c
would increase as the ??????
R
e
f
or the E increase, and the ?????0.2
?
c
?
0.2
when ????=10,137
C
w
=
10
,
137
, ??????=5.12×105
R
e
f
=
5.12
×
10
5
, and 0.2=??=0.4
0.2
=
E
=
0.4
. In addition, the thrust coefficient increases as the E or the ??
?
increases, and the increase in the thrust coefficient does not exceed 4% when the ??=0.2 and the ??=0.1
E
=
0.2
and
the
?
=
0.1
in this paper. However, the moment coefficient on the rotating shaft is almost independent of the E and the ?. An increase in the ??????
R
e
f
will reduce the effect of turbine blade fracture on the thrust and moment coefficients, when the ??????
R
e
f
is small.