Development Of The Mechanism Of Continuously Changing Sideslip Angle In High Speed Wind Tunnel

Early there was not the mechanism of continuously changing sideslip angle in some small-scale wind tunnel, by manually changing the different arms to alter the sideslip angle of the models when the wind tunnel is stopped, this work is very inconvenient, and the sideslip angle can not be changed continuously in one test. Some wind tunnels even alter the sideslip angle of the model by having the central support bracket deflexed relative to the upper and lower bracket, T-109 wind tunnel in the Russian just uses this approach.In recent years, the development of large aircraft test techniques is rapid. Large aircraft has good voyage range, aerodynamic efficiency and high accuracy requirements on the aerodynamic test data .Especially aircraft is more concerned on the lateral aerodynamic data. In one test to get more intensive lateral aerodynamic data has become an urgently problem which need to be solved . With the rapid developing of the technology, dual-shaft and large attack angle mechanisms and so on have application in the wind tunnel. But up to now large-scale high speed wind tunnel does not yet have the capacity of continuously changing the sideslip angle, especially in production wind tunnel. To found the test technology of continuously changing sideslip angle in the large-scale transonic wind tunnel can better settle for the cruise aerodynamic characteristics of large aircraft test needs.We developed a set of mechanism of continuously changing sideslip angle according to the requirement about establishing the test technology in large-scale transonic wind tunnel. The mechanism includes the attack mechanism and the sideslip mechanism. It can change the sideslip angle continuously when the attack angle is unchanging. It also can change the attack angle continuously when the sideslip angle is unchanging.Main contents of this paper are:1. Optimizes the crescent shape support bracket by using the finite element software cosmosworks;2. Static analysis of the mechanism of continuously changing sideslip angle by using the finite element software ANSYS Workbench;3. Dynamic analysis of the mechanism of continuously changing sideslip angle by using the finite element software ANSYS Workbench; 4. Dynamic analysis of the mechanism of continuously changing sideslip angle with rear support and mass point by using the finite element software ANSYS Workbench;5. Disturbance effect test about the support bracket need to be done.The results show that the developed mechanism of continuously changing sideslip angle has enough static strength and static stiffness; the natural frequency of this structure disperse, which means it has better dynamic characteristics; by optimizing the design, the weight and blockage of the crescent shape support bracket has been reduced greatly. The results of the disturbance effect test about the support bracket show that the rear support is feasible.