Influence Investigation of Wide-Bodied Aircraft Test Model Cavity Pressure on Force Test Data Accuracy

摘要

The sting support is the conventional support methodology in large aircraft wind tunnel force test with the ventral support as an auxiliary support to eliminate the support interference. In the previous large aircraft force test of the FL-26 wind tunnel, It is generally considered that the cavity pressure pattern and magnitude in situations of sting support and ventral support are assumed to be basically consistent, and the influence of model cavity pressure with sting support and ventral support on test data was not deducted. With the research and development of wide-body aircraft in China, As an important part of the accuracy of the test data, support interference must be studied in detail. In order to research the influence on the fore test data, a wide-bodied aircraft wind tunnel test was conducted in FL-26 wind tunnel. Four bottom pressure pipes were embedded to measure the cavity pressure in both sting support and Ventral support. For wide-body aircraft type, the test results show that the difference between cavity pressure patterns in the sting and Ventral support is apparent, and the influence on lift and pitch moment can be neglected.