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Title: Effect of a cylindrical throat occasionally produced in a CFVN designed to have a toroidal throat
Author: Masahiro Ishibashi
Source: 2018 International Symposium on Fluid Flow Measurement
Year Published: 2018
Abstract: Effect of a cylindrical throat occasionally machined in a R2D toroidal throat CFVN was investigate by hybrid CFVNs, in which a normally machined cylindrical throat of length L together with a diffuser of 3 degree are attached on a quadrant HPN that simulated a CFVN with the machining error. 10 cylindrical throats of various length L from 1 mm to 15 mm were machined. Effect of the premature inlet contraction was also investigated by using one-piece HPNs that have a shorter inlet toroid. They were calibrated by a constant volume tank system using air at the upstream pressures of 100 kPa840 kPa. It is shown that extreme Reynolds number dependence of discharge coefficient such as b 4 or b 3 will never happen if the CFVN has a toroidal throat with an ordinary curvature and such strange behaviors are resulted in by a cylindrical throat or a premature inlet contraction occasionally machined at the throat by machining error. It is also demonstrated that DCM (diameter correction method) that enables users to use a single curve for many CFVNs with a toroidal throat by modifying its throat diameter works fine.

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