一维热线单风扇测试

1、Fan Hotwire Measurement&Unsteady Lift test Naitong LIULdFlowFan FrameFanFan TubeValveHot wire probeProbe SupportHotwire Test ConfigurationSetup: 1D probe+ long straight probe support.Calibration: in ZIRI wind tunnel.Sampling Frequency: 50khz; Duration: 5 seconds.Mounting: The straight probe is binde

2、d on a small L pipe (Pitot tube) which is fixed on the height gauge. The axial and radial location variation can be controlled by adjusting gauge and its axial location. Drawback: The whole probe support is set into the flow field, which may affect the result. A L support or L probe will help to sol

3、ve the problem. However, none of them is available at present. Kaihui LI from China Jiliang University takes part in the test and he offers a great help. Hot-wire InformationLow Pressure Point Q=74.28CFM V=3.1m/s Ps=61.21pa Pt=62.5paL=-10mmL=-8mmL=-6mmL=-4mmL=-2mmL=0mmL=5mmL=10mmMedium PressurePoint

4、 Ps=81.10pa Q=58.97CFML=-10mmHigh Pressure Point Ps=96.69pa Q=51.75CFML=-10mmConclusion:For AVC fan, stall takes place before it comes to its medium pressure working point.In low pressure condition, d=5-15mm from the hub shows good flow characteristic and the flow do not mix seriously until 5mm behi

5、nd the stator. Next step:Find when and where stall happen? Alter the pressure with an interval 3 pa from 62pa (low pressure point) to 81pa (medium pressure point), with fixed hotwire location at L=-10, d=9.Why d=9mm?P=72pa can be regarded as the critical point.Pt3= 69 PascalL=-10 -6 -2 5mmd=325mmL=-10