Handbook of Turbomachinery Second Edition Revised - Ventech!

1. Thermal tests. These are performed in the laboratory.
Cold flow tests of actual blades, vanes, TOBI (tangential on-board
injector), etc. to validate design.
Liquid-crystal tests to evaluate internal or external heat-transfer
coefficients,
Scaled transparent model (e.g., stereo-lithography, plexiglass) tests,
etc.
2. Vibratory tests. These are performed in the laboratory or in
special spin-pits. They include:
Shaker-table acoustics
Component holography
Component strain gauge
Spin-pit jet impingement
3. Stress tests. These consist of:
Spin-pit cyclic and overspeed tests, usually of blades and disks.
Spring rate deflection
4. Material property determination. These tests are meant to obtain
knowledge of properties of materials under development or to obtain
characteristics at elevated temperatures or high stress levels. Large banks of
material property data exist at most companies (Honeywell, GE, Pratt &
Whitney, Rolls Royce Plc., Siemens-Westinghouse, etc.). These data banks
are used in determining the elastic and thermal properties at the required
design conditions. The tests may be severe enough to cause fracture or other
type of failures in some of the materials.
5. Rig tests. They include
Cold aerodynamic tests
Seal tests
Bearing tests
Combustor tests
6. Engine tests. These tests comprise the following:
Performance diagnostics conducted to determine power output,
specific fuel consumption, and other aspects of overall health of the
engine.
Thermal survey of the whole engine to ensure that the temperatures at
all points in the secondary flow system and other points are at
predetermined levels. These include metal, gas path temperatures and
Copyright © 2003 Marcel Dekker, Inc.