| Summary: | Experimental studies of mean velocity distributions under flow in the mainstream of a T pipe junction are conducted and the inlet flow keeps a good agreement with the previous research with the Reynolds number about 2.9 × 105 based on the hydraulic diameter and centerline velocity in the main duct inlet. ATSI Constant Temperature Anemometer hot wire system is used to acquire the velocity data in a low speed wind tunnel. The results show that from the suction position, the correlation coefficient and amplitude ratio decrease strongly and recover slowly as the distance far away from the suction. The influence of different inlet velocity in main duct and velocity ratio is analyzed. It could be expected that the correlation coefficient rises again to 1 again, that is to say, the velocity profile would be normal as a typical symmetry at location far enough. The results would be helpful for designing the ventilation and heat transfer equipment used in high speed train.
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