| Summary: | 碩士 === 龍華科技大學 === 工程技術研究所 === 97 === Due to the environmental contamination and lack of water resource, the efficiency of fresh water usage has becoming more and more stinging. In Taiwan, the government regulation for water amount flushed after using a sit-type toilet has been restricted from originally 12 liters down to six liters. Reducing the water amount flushed and still having good flush efficiency is a changing work. In this research, TRIZ theory was used to find out that the improving of the flow strength was a way to enhance flush effect. Full scale models were built to measure the water flow velocity in the passage inside the toilets. Dimension analysis was also used to establish a relation equation for the flush effect. This equation help designer to predict the flush effect of a toilet beforehand.
Finally a commercial software, STAR-CD, was used to analyze the flush flow in the passage. Though it was based on the steady state assumption, while the actually flush behavior is a transient state, the velocity calculated and measured shows positive correlation. The calculated data also show that a passage with better flush effect assumes smaller pressure drop.
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