2010 Fiscal Year Final Research Report

Study of Choking Phenomena of Compressible Flow in Extremely Small Nozzles and its Application to Extremely small and Critical Mass Flow Meters

Research Project

Project/Area Number	20560167
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	Fluid engineering
Research Institution	The University of Kitakyushu
Principal Investigator	KAZUYASU Matsuo The University of Kitakyushu, 国際環境工学部, 教授 (30037759)
Co-Investigator(Kenkyū-buntansha)	MIYAZATO YOSHIAKI 北九州市立大学, 国際環境工学部, 教授 (30253537)
Project Period (FY)	2008 – 2010
Keywords	チョーク現象 / 圧縮流れ / 臨界流量計 / 極小ノズル / 境界層 / 超音速流れ
Research Abstract	The choking phenomena of extremely small sonic or supersonic nozzles have been investigated using four nozzles with the same diameter but different boundary layer thickness at the exit of the nozzle. The effects of the boundary layer thickness at the nozzle exit to the critical pressure ratio across the nozzle when the flow is just choked have been clarified and the discharge coefficients of different shape of nozzles at the critical conditions have been obtained.

(5 results)