Drag Reduction Research Based On Turbulent Boundary Layer Control

In recent years,with the deepening of the understanding and research on the turbulent coherent structures,and the continuous development of science and technology,more and more people are investing in the study of turbulence.The research on drag reduction based on turbulent flow control is one of the important ones.Efficient and reasonable drag reduction method has important scientific significance and practical value.Because it brings lower fuel consumption,but higher propulsion efficiency,and more stable movement.In this paper,the direct numerical simulation program(UTADNS)developed by Professor Liu Chaoqun and others is used to simulate the wall turbulence.The simulation results are in good agreement with the existing turbulence theory,which verifies the property program.The boundary condition of the wall is modified,and a streamwise slit array is arranged in the fully developed turbulent region to implement the partial blowing/suction control.This paper simulates turbulent controls including the steady spanwise-alternating blowing\suction,the steady blowing,the steady suction,the periodic spanwise-alternating blowing\suction,and the periodic blowing.Then the drag reduction effects of different controls and different control parameters under the same control is discussed in this paper.And the drag reduction mechanism of the steady blowing control is explored and analyzed in the end.