Abstract
In order to develop the low specific speed diagonal flow fan with good performance, low specific speed (Ns=670(rpm, m^3/min, m)) diagonal flow fan was designed using a quasi-three-dimensional aerodynamics design method, the fan test was carried out, and the internal flow fields were measured by the use of hotwire anemometer with a slant hotwire probe and sensor of pressure. From the result of the fan test, the test fan designed showed a good performance at design point. From the result of internal flow measurement, it is found at near design flow rate that the tip leakage vortex was occurred by high velocity deviation and low pressure on the casing wall.
