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Title: Wiping out PUP (Premature Unchoking Phenomenon) in CFVNs
Author: Masahiro Ishibashi
Source: 2018 International Symposium on Fluid Flow Measurement
Year Published: 2018
Abstract: It is shown that a small and simple ring attached on the inlet plane of a CFVN wipes out premature unchoking phenomenon (PUP) almost completely and let the CFVN choke up to higher pressure ratio near the theoretical critical back pressure ratio, although it is not effective at very low Reynolds number in the order of 1E3. The ring lowered the discharge coefficient slightly, but the discharge coefficient with the ring and its Reynolds number dependence are stable as the normal CFVNs, therefore, it may be possible to design a new shape of CFVN that can avoid PUP for a certain range of the Reynolds number. Choking patterns of various rings are presented. Effect of the backside geometry on PUP as well as super-fine structure of the critical flowrate (SFS) are also discussed.

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