滞留部の熱成層化による高サイクル熱疲労に関する研究 : L_<sh>評価手法の概要(熱工学,内燃機関,動力など)

概要

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This study is focused on development of pipe design standard to suppress thermal fatigue, and the developed model evaluates L_<sh> defined as penetration length of cavity flow into a branch pipe with closed end which consists of a vertical and a horizontal pipe connecting to a main loop with fluid flow. This evaluation model is applied to phenomenon that fluid temperature in a main loop is higher than that in a branch pipe and an atmosphere because thermal stratification layer appears due to temperature differences between cavity flow and fluid in a branch pipe under that condition, and thermal stratification affects the structural integrity. In order to establish the evaluation method for L_<sh>, the visualization tests and the high temperature and high pressure experiments were carried out for the branch pipe consist of a vertical and a horizontal pipe connected with an elbow. The evaluation method can estimate the penetration length by the cavity flow in the several types of the branch pipes within 20% accuracy.
社団法人日本機械学会の論文
2004-01-25