A measuring method for three-dimensional turbulent velocities based on vector decomposition and synthesis

作者：Zheng Guilin; Zhang Li^*; Zhuan Xiangtao; Shang Xiaodong

来源：International Journal of Heat and Technology, 2015, 33(4): 51-60.

DOI：10.18280/ijht.330407

• Electrical output signals
• Embedded microprocessors
• Laser Doppler velocimeter (LDV)
• Piezoresistance
• Piezoresistive sensing
• Three-dimensional turbulence
• Threedimensional (3-d)
• Vector decompositions

In this paper, an approach is proposed for measuring three-dimensional (3D) turbulence velocities by the vector characteristics of flow velocity. Based on the principle of vector decomposition and synthesis, a special multi-vector three components (3C) tripod structure, which can sense flow velocities with little disturbance to the measured flow, is studied. At the front most of the 3C structure, the sensing ball exposed to the flow creates strains on each of the three silicon piezoresistance beams, and the corresponding deformation of the beams is converted into electrical output signals by the Wheatstone bridge. The desired 3D turbulent velocities could be obtained by the vectors output signals of the three piezoresistive sensing microcircuits with an embedded microprocessor. The reasonability and feasibility of the 3D structure design can be verified by simulation experiments. The 3D velocities data can be collected in a certain period of time in a transparent water experiment. Furthermore, this method as a complex way will be used for measuring 3D turbulence velocity in fluid flow with hyper-sediment content up to 350kg/m3, where the Laser Doppler Velocimeter (LDV) and other types of flow meter cannot be used.

• 出版日期2015