Abstract
In order to develop the low specific speed diagonal flow fan with good performance, low specific speed（Ns=670（min-1, m3/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 5 hole Pitot tube and hotwire anemometer with a slant hotwire probe. From the result of fan test, the test fan designed showed a good performance at the design point. From the results of internal flow measurement, mean velocity distributions for meridional and tangential velocity near design flowrate were similar distributions of design condition. From the phase-lock averaged velocity distributions, it is also found at all measurement flowrate that there exists the region with low meridional velocity and high tangential velocity in blade passage.
