Vol.2, No 7/2, 1997 pp. 561 - 574
UDC: 621.513; 621.43.031; 621.5.041; 621.51
UNSTABLE OPERATION OF TURBOMACHINES
Dragica Milenković
University of Niš, Faculty of Mechanical Engineering
Beogradska 14, 18000 Niš, Yugoslavia
Abstract. The paper presents the results of the experimental and
theoretical investigation of the rotating stall in the centrifugal compressor
impeller assembled with the vaned and vaneless diffuser. The study of the
phenomenon of the rotating stall in the centrifugal compressor stage has
been accomplished by means of automated measuring complex. The objective
of the obtained data analyses was determination of the rotating stall appearance.
It has been found that two different kinds of stall exist, which points
out to two different possibilities of the rotating stall origination.
NESTABILAN RAD TURBOMAŠINA
U predloženom radu dati su rezultati eksperimentalnog i teorijskog ispitivanja
karakteristika odvajanja (otkidanja) radnog kola centrifugalnog kompresora
u sklopu s lopatičnim i bezlopatičnim difuzorom. Ispitivanje pojave otkidanja
vrtloga u međustupnju centrifugalnog kompresora ostvareno je pomoću automatizovanog
mernog kompleksa. Dobijeni podaci su analizirani u cilju određivanja inicijatora
nastajanja pojave otkidanja vrtloga. Otkriveno je da postoje dve različite
vrste otkidanja vrtloga, što govori o mogu}nosti dva mehanizma nastajanja
otkidanja vrtloga.
