The partial admission technique is widely used to control the output power of turbines. In some cases, it has more merits than full admission. However, additional losses, such as expansion, mixing, or pumping, are generated in partial admission as compared with full admission. Thus, an experiment was conducted in a linear cascade apparatus having a partial admission region in order to investigate the effect of partial admission on a blade row. The admission region was formed by a spouting nozzle installed at the inlet of the linear cascade apparatus. Its cross section was rectangular and its size is 200×200mm2. The tested blade was axial-type and its chord was 200 mm. Nineteen identical blades were applied to the linear cascade for the partial admission experiment. The blades moved along the rotational direction in front of the admission region, and then operating forces and surface pressures on the blades were measured at the steady state. The experiment was conducted at a Reynolds number of 3×105 based on the chord. The nozzle flow angle was set to 65 deg with a solidity of 1.38 for performance test at the design point. In addition, another two different solidities of 1.25 and 1.67 were applied. From the experimental results, when the solidity was decreased, the maximum rotational force increased but the maximum axial force decreased.

1.
Robert
,
C. K.
,
Howard
,
Z. H.
, and
Warren
,
J. W.
, 1949, “
Effects of Partial Admission on Performance of a Gas Turbine
,” NACA Technical Note No. 1807.
2.
Bohn
,
D.
,
Gier
,
J.
, and
Ziemann
,
M.
, 1988, “
Influence of the Cross-Over Channel Geometry on the Flow Equalization in Partial-Admission Turbines
,”
VGB Power Tech
,
2
, pp.
49
54
.
3.
Verneau
,
A.
, 1987, “
Supersonic Turbines for Organic Fluid Rankine Cycles From 3 kW to 1300 kW
,”
VKI Lecture Series
, 1987-09.
4.
Cho
,
S. Y.
,
Cho
,
C. H.
, and
Kim
,
C.
, 2008, “
Performance Characteristics of a Turbo Expander Substituted for Expansion Valve on Air-Conditioner
,”
Exp. Therm. Fluid Sci.
0894-1777,
32
, pp.
1655
1665
.
5.
Skopec
,
J.
,
Vomela
,
L.
,
Tajc
,
L.
, and
Polansky
,
J.
, 1999, “
Partial Steam Admission in an Axial Turbine Stage
,”
IMechE International Conference on Third European Conference on Turbomachinery ‘99
, Conference Transactions, C557/077/99, pp.
681
691
.
6.
Musatkin
,
N. F.
, and
Tikhonov
,
N. T.
, 1979, “
Influence of Upper and Lower Overlap on Efficiency of Partial-Admission Axial Air Microturbine
,”
Soviet Aeronautics
,
22
, pp.
95
97
.
7.
Cho
,
S. Y.
,
Cho
,
C. H.
, and
Kim
,
C.
, 2008, “
Effect of Solidities and Nozzle Flow Angles on a Partially Admitted Small Axial-Type Turbine
,”
Int. J. Turbo Jet Engines
0334-0082,
25
(
2
), pp.
111
120
.
8.
Sutton
,
R. F.
,
Boynton
,
J. L.
, and
Scheer
,
D.
, 1985, “
Small Two-Stage Partial Admission Turbine
,”
The JANNAF Propulsion Meeting
, Paper No. N86-17380, pp.
55
62
.
9.
Rockwell International
, 1992, “
Design and Experimental Performance of a Two Stage Partial Admission Turbine Task B1./B.4
,”
NASA
Paper No. CR-179548.
10.
Yahya
,
S. M.
, 1969, “
Some Tests on Partial Admission Turbine Cascades
,”
Int. J. Mech. Sci.
0020-7403,
11
, pp.
853
866
.
11.
Boulbin
,
F.
,
Hetet
,
J. F.
, and
Chesse
,
P.
, 1994, “
Non-Steady Flow in the Partial Admission
,”
VDI-Ber.
0083-5560,
1109
, pp.
395
401
.
12.
He
,
L.
, 1997, “
Computation of Unsteady Flow Through Steam Turbine Blade Row at Partial Admission
,”
Proc. Inst. Mech. Eng., Part A
0957-6509,
211
, pp.
197
205
.
13.
Doyle
,
M. D. C.
, 1962, “
Theories for Predicting Partial-Admission Losses in Turbines
,”
J. Aerosp. Sci.
0095-9820,
29
, pp.
489
490
.
14.
Suter
,
P.
, and
Traupel
,
W.
, 1959, “
Untersuchungen Uber den Ventilationsverlust von Turbinenradern
,” No. 3, Mitteilungen aus dem Inst. fur Thermische Turbomaschinen, (BSRA Translation No. 917).
15.
Stenning
,
A. H.
, 1953, “
Design of Turbines for High Energy, Low Power Output Applications
,” Massachusetts Institute of Technology, DACL Report No. 79.
16.
Ohlssson
,
G. O.
, 1962, “
Partial-Admission Turbines
,”
J. Aerosp. Sci.
0095-9820,
29
(
9
), pp.
1017
1028
.
17.
Balje
,
O. E.
, and
Binsley
,
R. L.
, 1968, “
Axial Turbine Performance Evaluation Part A—Loss Geometry Relationships
,”
J. Eng. Power
0022-0825,
19
, pp.
341
348
.
18.
Yahya
,
S. M.
, 1970, “
Partial Admission Turbines and Their Problems
,”
Bull. Mech. Engineering Education
,
9
, pp.
263
273
.
19.
Korematsu
,
K.
, and
Hirayama
,
N.
, 1979, “
Performance Estimation of Partial Admission Turbines
,”
ASME
Paper No. 79-GT-123.
20.
Cho
,
S. Y.
,
Cho
,
C. H.
, and
Kim
,
C.
, 2006, “
Performance Prediction on a Partially Admitted Small Axial-Type Turbine
,”
JSME Int. J., Ser. B
1340-8054,
49
(
4
), pp.
1290
1297
.
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