Abstract：A new high-accuracy diverter for primary water flow standard facility has been developed by hydraulic machinery laboratory at IWHR, China. As the core of water calibration facility, diverter determines the test accuracy. Diverter uncertainty test was performed according to China verification code of JJG 164—2000, getting the result that combined standard uncertainty of diverter UDrel is less than 0.015%(k=2). In order to analyze the dynamic principal characteristic, numerical simulation method was adopted, which employs VOF multiphase model and k-ε turbulence model to obtain the water volume fraction inside diverter and to calculate the collecting rate for different positions. By high-speed camera, the operation procedure of the diverter has been obtained, and the dynamic curve and the ti-ming trigger position have been achieved. The results have been applied to calibrate large flow in situ and large diameter flowmeter.
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