METHOD OF PREVENTING DISTURBANCE FROM PROPAGATING TO MEASURING PORTION IN TEMPERATURE-STRATIFIED WIND TUNNEL

摘要

PROBLEM TO BE SOLVED: To realize a test without trouble by preventing a disturbance generated in a wind tunnel from propagating to a measuring portion.;SOLUTION: This method consists of forming a stratified flow provided with a predetermined temperature distribution in the height direction of an air flow by a stratification cart 5 (heating stratification portion) disposed on the upstream side from a measuring tunnel 3 (measuring portion), thereby making it possible to perform various kinds of wind tunnel tests by introducing the stratification flow into a measuring tunnel 3. A multistage damper structure 29 is provided on either of an inlet side of the stratification cart 5 or an outlet side of the measuring tunnel 3 (Fig. 1 illustrate the case where the stratification cart 5 is arranged on the inlet side from the stratification cart 5), an occlusive rate of each stage is increased by the damper structure 29 to set a high differential pressure before and after the damper structure 29. Thus, a wind speed passing through each stage of the damper structure 29 is increased to thereby locally form a jet flow with a high Froude number.;COPYRIGHT: (C)2001,JPO