By Schilienger J.P.
This paintings provides the result of specified unsteady circulate measurements in a rotating degree shrouded axial turbine. The turbine was once outfitted on the Laboratory of Turbomachinery on the ETH Zurich as a part of this thesis. The layout, the rig engineering and the producing of the turbine was once one major job of this paintings. The ensuing very special facility is used to experimentally examine the evolution and convection of the unsteady secondary stream box and its interplay with the blade rows in a true multistage atmosphere. The time-resolved circulate box measurements within the moment turbine level are played with hugely subtle miniature quickly reaction strain probes and cutting-edge pneumatic multi-hole probes for the regular stream box. the original blend of this flexible learn facility and the complex dimension know-how of speedy reaction probes, makes the provided effects very exact. Novel probe calibration versions and probe designs are built and demonstrated within the turbine movement box. The engineering of hugely computerized information relief platforms (HERKULES) result in a strong software program device for the postprocessing of the short reaction strain info inside of a couple of hours for a standard zone traverse of a number of hundred grid points.The interplay of the rotor indigenous vortices with the downstream blade rows are topic of important loss new release as a result of the stretching of the vortices as they convect in the course of the downstream blades. This hugely unsteady approach is measured in nice element on the go out aircraft of the 1st rotor. The unsteady movement box is classed into 3 time classes for one blade passing occasion. within the first interval, the extent of interplay among the vortices, the wakes and the downstream blades is average and the turbine losses are minimum. the second one part indicates an interplay mechanism among the rotor vortical process and the rotor wake, because the vortices are driven in the direction of the rotor suction part because of the relative movement of the rotor and stator blades. The excessive loss fluid from the wake is rolled up into the passage vortex and raises loss on the rotor hub part. The turbine losses achieve a greatest in the 3rd interval the place the vortices are tilted and stretched within the streamwise course. The linked raise of vorticity generates extra shear and therefore extra loss. The measured mechanism is regular for unsteady flows and losses during this form of move environment.The result of the labyrinth seal edition highlights the significance of the reentry direction of the leakage circulate the mainstream and shows that the hub and tip labyrinth layout should be thought of from varied views. The prediction of secondary flows and move profiles is completed by way of a singular circulate version as proven within the thesis. The stream version is demonstrated with experimental info in which the implications express first-class contract with the measured info.