| Summary: | 碩士 === 龍華科技大學 === 機械工程系碩士班 === 103 === The design of entire passage system of water closets affects its flush performance. Generally speaking, the passage system is divided into two parts. An upper part includes water tank, a ring passage and water holes passing through the ring passage into the bowel of water closet. A lower part starts from the bowel into a windy passage inside the bowel body. Both parts influence the flush performance. Even more, these two parts are mutually affecting. This mutually affecting effect seriously troubles the designer of water-closet pursing good performance.
Based on this reason, this study chooses several important geometric dimensions including the diameter, height and length of passage and the height of tank to discuss their impact on performance by Taguchi method. Further steps are taken to study what flow characteristics at the bowel would make good performance of water closets.
The results of this study suggest that among the geometric dimensions chosen, the passage diameter and height of water tank is most influential to the performance. Comparisons of flow field characteristics also show that water closet with better flush performance produces higher swirling in the bowel.
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