| Citation: | PAN Jiaxin, LIN Qi, WU Huisong, et al. Comparative experimental study on wind tunnel based on WDPR-8 and machetes tail support[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(5): 1038-1048. doi: 10.13700/j.bh.1001-5965.2020.0124(in Chinese)
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For a dynamic test model designed in China in recent years with a typical advanced fighter layout, Wire-Driven Parallel Robot with 8 Wires (WDPR-8) support and a traditional machetes tail support were used in a FL-5 wind tunnel for a comparative blow test. According to the wind tunnel test environment and the system's stiffness and working space, WDPR-8 wire structure and supporting mechanism were designed, and the prototype was built; for the blocking ratio and the distance between the two centers are small, the versatility of the model in the two support systems was ensured, and the test model of the built-in six-component bar balance was designed; the wire tension signal is used to parallel the WDPR-8 vision acquisition system and the wind tunnel VSS acquisition system to achieve that the three systems work synchronously. Repeatable tests, longitudinal tests, and transverse tests were performed under conditions in which the test conditions are consistent except for the support system. During data processing, the WDPR-8 was not modified for the tail bracket, and the tail support was modified for the tail bracket. The comparison of the test results of the two supports shows that the maximum mean square error of the lift coefficient obtained by the repeated tests in longitudinal test is near. The maximum mean square error of lift coefficient, drag coefficient, pitching moment coefficient obtained by the two supports do not exceed 3.6%. In the transverse test, the variation law of the derivative of the lateral force coefficient to the side slip angle obtained by the two supports are basically the same throughout the test angle of attack. The lift coefficient hysteresis loop curve obtained from the single-degree-of-freedom pitch oscillation test performed with WDPR-8 is consistent with the static lift coefficient curve. The lift coefficient hysteresis loop was continuous from beginning to end, and the area of the unsteady hysteresis loop increases with the shrinkage frequency, which is in line with the physical meaning. The experimental research results reflect the feasibility and effectiveness of the WDPR-8 support.
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