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Research on flutter test technology of continuously adjusting dynamical pressure in high-speed wind tunnel
Pages: 72-77
Year: Issue:  5
Journal: Experiments and Measurements in Fluid Mechanics

Keyword:  flutteraero-elasticitywind tunnel testtest technologyflow controlling;
Abstract: According to the defects shown in the flutter tests of stepped adjusting dynamical pressure in high speed intermittent wind tunnel,such as:long testing time,high gas consumption,and short acceptable life of testing models,researches on flutter test technology of continuously adjusting dynamical pressure in high-speed intermittent wind tunnels are conducted.Technical problems of flutter test data processing and wind tunnel flow controlling have mainly been solved.The specific approaches are:in the 2.4m×2.4mblow off transonic wind tunnel,fixed Mach number and linear varying total pressure controlling strategies based on movement function are presented,and thus the flow controlling goal of fixed Mach number continuously adjusting dynamical pressure is achieved.The controlling uncertainty of Mach number reaches less than0.005 without deviation of dynamical pressure.The Pick-Hold method is adopted to set up the subcritical prediction criterion in flutter boundary;according to the characteristic that the reciprocal of predicting criterion is close to the normal distribution,aparameter estimation method based on the mathematical statistics theory can be used to reduce the diffusive sampling of the prediction criterion and then the accuracy of the subcritical prediction of flutter boundary can be increased.The results of wind tunnel verification test show that the flutter test results of continuously adjusting dynamical pressure is in consistent to that of stepped adjusting dynamical pressure,and the test technology has reached engineering practical levels;besides,the gas consumption is greatly reduced by using flutter test technology of continuously adjusting dynamical pressure,and thus it also has good economic benefits.
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