Contents update of STCF 4

Status as of September 2002.

2D geomertry file: Inst.geom.4th.dat (7 KB).

The data of STCF 4 is updated with additional 3D inlet and outlet boundary conditions. Steady blade surface pressures and unsteady blade surface pressures of the blades vibrating with an angle of 60.4° to chord line are only measured at midspan. For the moment the steady and unsteady data of three cases are made available, case 624, case 627 and case 628. The data was obtained at the annular test rig at the EPF Lausanne in 1986 and was recompiled for storage at this place by Dr. P. Ott , LTT, EPFL.

Some detail information needed for the 3D models of the cascade are given in the downloadable document STCF4_3D.PDF (459 KB).

Note on tip clearance:
The tip clearance was estimated on the dismantled configuration by measuring the outer diameter of the cascade: largest diameter = 399.49 mm, smallest diameter = 399.32 mm.
With the inner diameter of the test section of 400.0 mm (slightly oval by 0.1 mm) this gives a tip gap size of approximately 0.3 mm.

The following files (MS-WORD 6 format) can be downloaded.
 

nomenclature.doc (14.8 Kb)

used nomenclature and schematic view of the test cascade

STCF4, Case 624
M_1S=0.21, beta₁=-21.4 degree
M_2S=1.04, beta₂=-71.3 degree
k=0.0999
 

blade_flow.624.doc (13.8 Kb)	Steady blade surface pressure coefficients
upstream_flow.624.doc (18.9 Kb)	3D inlet flow data vs. pitch and radius
downstream_flow.624.doc (24.1 Kb)	3D outlet flow data vs. pitch and radius
summary.probes.624.doc (9.7 Kb)	inlet and outlet flow data vs. radius, pitch-wise averaged
unsteady_data.624.doc (116.2 Kb)	blade vibration specification, 1st harmonic of unsteady blade surface pressure coefficients

STCF4, Case 627
M_1S=0.19, beta₁=-15.2 degree
M_2S=0.85, beta₂=-71.5 degree
k=0.1187
 

blade_flow.627.doc (13.8 Kb)	Steady blade surface pressure coefficients
upstream_flow.627.doc (24.0 Kb)	3D inlet flow data vs. pitch and radius
downstream_flow.627.doc (27.6 Kb)	3D outlet flow data vs. pitch and radius
summary.probes.627.doc (10.8 Kb)	inlet and outlet flow data vs. radius, pitch-wise averaged
unsteady_data.627.doc (110.6 Kb)	blade vibration specification, 1st harmonic of unsteady blade surface pressure coefficients

STCF4, Case 628
M_1S=0.2, beta₁=-12.0 degree
M_2S=1.39, beta₂=-68.3 degree
k=0.0799
 

blade_flow.628.doc (13.8 Kb)	Steady blade surface pressure coefficients
upstream_flow.628.doc (18.9 Kb)	3D inlet flow data vs. pitch and radius
downstream_flow.628.doc (24.1 Kb)	3D outlet flow data vs. pitch and radius
summary.probes.628.doc (9.7 Kb)	inlet and outlet flow data vs. radius, pitch-wise averaged
unsteady_data.628.doc (116.2 Kb)	blade vibration specification, 1st harmonic of unsteady blade surface pressure coefficients