Experimental investigation of GTE fan 2stage blade flutter under different interraction between blades shrouds

Аuthors

Makarov P. V.

Gas turbine engineering research and production center Salyut, 16, Budennogo av., Moscow, 105118, Russia

e-mail: kbpr@salut.ru

Abstract

Results of full-scale engine test under atmosphere condition and different interaction between fan 2stage blade shrouds is considered. The methods and sort of measurement and scheme of different sensors installation are discussed. It is shown, that the affected set of contact and non-contact sensors together with special methods of processing results of measurements give a possibility diagnosis of blade flutter with high level of reliability. It is obtained that if there are gaps more than 2mm between blades shrouds of fan 2stage flutter of this blades is appeared under atmosphere condition but when the rotation speed will be more than 70% from maximum.

Keywords:

flutter, span-shroud, blade, natural mode, lag phase, strain gage.