Several manipulators were tested in fully developed two-dimensional turbulent boundary layer.The drag was mearsured directly by an elastic balancing dovicc composed main- ly with a displacement sensor.The efficiencies and principles of skin friction reduction were stu- died.The test results show that the shape and arrangement of LEBU(Large Eddy Breakup)and other devices have significant influence to the skin friction,and a net drag reduction appears in some cases.
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