Project sponsored by the Austrian Science Foundation FWF

Project Start: 1994; Project End: 1997

Project Applicant / Contact: Prof. Herbert Jericha

Objective: At flow velocities up to 800 m/s in advanced gas turbines, even small particles from 1 to 3 microns might cause considerable blade erosion. Especially in flow regions where both high particle accumulation and large velocity gradients (i. e. tip clearance), exist at the same time, an enormous erosion potential is given. Therefore particle motion in boundary layers have to be known more accurate. In addition to usual drag force, particular effects in flow fields with big velocity shear (Saffman force), and deviation according to particle rotation (Magnus force) have to be considered. Because drag information is hardly available for spherical particles in literature, closer investigations on the effects of more realistic particle shape existing in nature had to be initiated. On the other hand the basics of high speed particle impact and dust behaviour on their way through shock waves are not satisfyingly explored yet. In a specially designed erosion test rig within the institute's transonic cascade, above mentioned investigations could be initiated. LDV-measurements and further research work on the target surface will act upon the fundaments of an improved erosion theory. All the results of these investigations will have their effects on the final research goal, the design of a wood fired gas turbine, where all of the particular design features are accordingly adapted.

Publications:

1. Jericha, H., Sanz, W., Pöschl, R., 1995, "Industrial Gas Turbine with High Rate Particle Flow", ASME Paper 95-CT-83, ASME Cogen-Turbo Power Conference, Vienna
2. Pöschl, R., Jericha, H.,> 1995, "Staubströmung in thermischen Turbomaschinen Teil1: Räumliche Stufenströmung", ÖIAZ, 140.Jahrgang, Heft 10-11, pp 331-335
3. Zettl, E., Jericha, H. , 1995, "Staubströmung in thermischen Turbomaschinen Teil2: Partikelbewegung in der Grenzschicht", ÖIAZ, 140.Jahrgang, Heft 10-11, pp 336-340
4. Woisetschläger, J., Jericha, H., 1995, "Laserholographische Messung der Änderung des Schwingungsverhaltens von Gasturbinenschaufeln infolge Erosion", in "Schwingung in rotierenden Maschinen III", H.Springer, H.Irretier, R.Nordmann, H.Springer,Eds., Vieweg, ISBN3-528-06655-5, pp 65-73
5. Gehrer, A., Zettl, E., Pöschl, R., Jericha, H., Pachler, R.,1996, "Teilchen- bzw. Tröpfchenbahnen bei der Expansion von staubbeladenen bzw. feuchten Gasen in Radiallaufrädern", VDI Berichte, Nr.1251, 141-155
6. Pöschl, R., Zettl, E., Jericha, H., Ghanimi, Y., 1996, "Genese von Erosionszonen an Schaufeln einer FCC-Gasturbine",VDI - Tagung Magdeburg, Berichte Nr. 1251, 1996

Schedule and connection between projects (JPEG 125 kB)