Numerical and experimental research on pentagonal cross-section of the averaging Pitot tube

Abstract

Averaging Pitot tubes have been widely used in many fields because of their simple structure and stable performance. This paper introduces a new shape of the cross-section of an averaging Pitot tube. Firstly, the structure of the averaging Pitot tube and the distribution of pressure taps are given. Then, a mathematical model of the airflow around it is formulated. After that, a series of numerical simulations are carried out to optimize the geometry of the tube. The distribution of the streamline and pressures around the tube are given. To test its performance, a test platform was constructed in accordance with the relevant national standards and is described in this paper. Curves are provided, linking the values of flow coefficient with the values of Reynolds number. With a maximum deviation of only ±3%, the results of the flow coefficient obtained from the numerical simulations were in agreement with those obtained from experimental methods. The proposed tube has a stable flow coefficient and favorable metrological characteristics.

An engineering‐oriented variable water flow air‐conditioning system terminal flow rate estimation method based on component flow resistance characteristics

“…Other studies 25,26 indicated that gas-liquid two-phase flows could be measured by a Coriolis flowmeter or electromagnetic flowmeter. Zhang et al 27 introduced a novel cross-section-shaped averaging Pitot tube that enabled a higher differential pressure than some other known tubes. Mu et al 28 proposed a new design of a butterfly valve flowmeter that could be used effectively in variable air volume air-conditioning systems.…”

Numerical and experimental characterisation of an aeronautic Pitot probe

“…Several experimental and theoretical studies involve calibration of PP under several circumstances (7)(8)(9)(10) . More recent works include the research developed by Zhang et al (11) , in which a pentagonal cross-section averaging PP was studied theoretically and experimentally. The geometry of the tube was optimised with numerical simulations using CFD, then the flow co-efficients were obtained as a function of Re.…”