熱水ノズルの噴射特性に関する研究 : 飽和二相流および空気・水二相流動試験による先細・末広ノズルの性能改善

概要

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The characteristics of the hot water nozzle are among the most important factors in the utilization of hot water cycle power generation. Jet flow tests on convergent-divergent nozzles using either saturated hot water or air-water two-phase flow have been conducted to improve nozzle performance. The characteristics of critical flow and steam quality at nozzle throat, and thrust force coefficient for eleven kinds of nozzle configurations are investigated. This paper is a summary on the experimental analysis, which shows that (1) the critical flow characteristics are similar to the Moody model calculation, (2) the steam quality at nozzle throat varies between 0.2% to 0.8%, (3) an inlet guide vane would improve the nozzle thrust coefficient by 15%, (4) the nozzle thrust coefficient increases in proportion to the divergent passage length, (5) assistance by high-pressure steam or air mixing to the nozzle throat improves the nozzle efficiency by 24%.
一般社団法人日本機械学会の論文
1995-05-25