Numerical Simulation Of Precision Centrifuge Flowfield And Fairing Shape Optimization

Precision centrifuge is a typical high-precision calibration device of inertial instrument. The accuracy and error of precision centrifuge affects the output of the inertial instrument. In order to improve the calibration accuracy of precision centrifuge, the influence of the flow-field, fluid-solid interaction and the shape optimization of fairing should be concerned. The research object of this paper is precision centrifuge, considering the requirements of project partners on this project, specific research contents is set as follow.(1) Based on the numerical theory of incompressible gas flow field and the structural of precision centrifuge, proposed a numerical simulation method which is applicable to flow field calculation in the precision centrifuge. Then the selection of turbulence model, near-wall treatment methods, the treatment of rotating flow field and other technique of the numerical simulation calculation was researched and introduced in detail.(2) The correctness of the numerical method which was used to precision centrifuge flow field was verified. This paper compared the numerical simulation results with the experimental test results of the precision centrifuge which was used to the application, analyzed the accuracy and feasibility of this numerical simulation method. The influence of rotational speed and chassis features of precision centrifuge to the calculation results is analyzed by numerical simulation method. The numerical method was used to simulate the flow field of precision centrifuge which has 10-6 accuracy class.(3) The fluid-solid interaction simulation analysis method of precision centrifuge was studied. The acceleration error model of precision centrifuge was theoretical derivate. The error of the precision centrifuge was analyzed, and the results of fluid-solid interaction analysis simulation, as a reference to the accuracy of precision centrifuge.(4) The optimization of blunt body in three-dimensional and translational flow field was studied. In order to reduce the average and fluctuating wind resistance, the shape of the fairing sensitivity was analyzed. Based on the provided general rectifier solution, the centrifuge fairing shape was optimized.(5) The optimizations for fairing of precision centrifuge were studied. Compared the results of slope rectification, semi-cylindrical rectification, inclined cylindrical rectification, slope tapered and rounded rectification, rounded cone rectification, the final fairing optimization model was proposed.