EXPERIMENTAL-STUDY ON FLOW AND MASS-TRANSFER IN ROTOR-STATOR DISK CAVITIES

An experimental study has been performed in an attempt to seek some po ssibilities of obtaining the solutions of heat transfer problems relat ed to rotor-stator disk cavity systems of gas turbine engines by analo gy with corresponding problems in mass transfer which arises from usin g naphthalene sublimation technique. Measurements are made to examine the effects of rotational Reynolds number, the flow rate and the gap r atio on the radial pressure distributions. Pressure inversion phenomen on has been verified to exist for the case of shrouded disks with radi al clearance, which perform better in terms of heat transfer, too? tha n those with axial clearance. The stator flow reattachment points are determined directly by the dual sensor pressure probes and compared we ll with those estimated from the distributions of static pressure and mass transfer coefficients.