冷風研削加工用矩形断面先細末広ノズルの開発

概要

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This study provides a useful guideline for design of supersonic convergent-divergent nozzle (C-D nozzle) of rectangular cross-section for the cooling air grinding. The C-D nozzles as trial products in various sizes are produced on an assumption of the isentropic flow of the perfect gas. Distributed total pressure of the air flow out of the nozzle is measured to estimate the potential core length L_<PC>. Dependences of L_<PC> on air flow parameters are validated under the correct expansion condition. The frictional exclusion caused near the inner wall is correlated with Reynolds number in physical state of the exit part. It appears behavior of the air flow without the frictional exclusion is in agreement with that of the isentropic flow. Both effects of the taper in the divergent part and aspect ratio of the cross-section at the throat on L_<PC> are clarified experimentally. A proper design procedure, which can determine configuration of C-D nozzle, is shown by arranging the experimental results and is related with required L_<PC> with the optimum air supply condition.
公益社団法人精密工学会の論文
2004-07-05