Abstract
In the range of very low specific speed ns, improvement of efficiency is the most important subject in order to apply turbo machine to such a low specific speed range. The purpose of the present study is focused on the performance improvement of pump in the range of ns?80 [m, m3/min, min-1], and CFD simulation is performed to determine the reason why efficiency is very low. The result shows that a rapid increase of leakage rate and disk friction rate with a decrease of ns is the main reason of low efficiency. Also, the result shows that if the leakage loss is reduced by use of Labyrinth seal at ns=25, the disk friction rapidly increases in spite of the leakage reduction and pump overall efficiency becomes only 5% higher.
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