HIGH-PRESSURE-GAS SUPPLY APPARATUS FOR WIND-TUNNEL TEST MODEL

摘要

PROBLEM TO BE SOLVED: To precisely measure the six-component-of-force aerodynamic load of a model by preventing the generation of a thermal strain due to the temperature difference of an internally mounted six-component-of-force balance having a space corresponding to a balance duct. ;SOLUTION: A space 2D is formed so as to be passed wholly along the axial center of an internally mounted six-component-of-force balance 2. A bellows A4 which forms the flow passage of a high-pressure gas HG and respective supply ducts 5, 6 at the front part and the rear part are arranged and installed so as not to come into contact with the inner wall of the internally mounted six-component-of-force balance 2. Consequently, the internally mounted six-component-of-force balance 2 is cooled little by the high-pressure gas HG, the generation of the drift of the balance is prevented, and an aerodynamic load which acts on a model 1 can be measured precisely without taking any measures so as to suppress the drift such as the compensation or the like of a temperature. In addition, the cooling operation of the internally mounted six-component-of-force balance 2 is reduced, and the flow passage which supplies the high-pressure gas HG to the model 1 via its inside is formed. As a result, although the bellows A4 is used, the fixed interference of a rolling moment L is removed by a rolling bearing 7, and the whole aerodynamic load acting on the model 1 can be measured.;COPYRIGHT: (C)1998,JPO