stivali ugg New structure of the jet flow of the e

New structure of the jet flow of the experimental study

Chi is the fluid oscillation flow meter of important performance parameters. 34 Figure 1 c, experimental procedure and experimental analysis of the experimental jet designed flowmeter is characterized by the structure set up a semi-circular streaming split. To divert fluid into a circular arc wedge, fluid arcs to generate the tangential velocity, tangential velocity induced in the fluid itself constantly rotating vortex zone appears, the vortex areas on the stability of Wall Jet Post with very favorable. It plays a stable shunt, stable adhesion, and enhance the feedback signal,[link widoczny dla zalogowanych], reducing the role of head loss. In the oscillating device, respectively, the two feedback channels open pressure taps, pressure taps are connected to both ends of the piezoelectric sensor, by AD data acquisition card connected to the computer, the application software to measure the fluid oscillation frequency oscilloscope. Piezoelectric sensor sensing the pressure oscillation generated alternating alternating voltage waveform by recording the oscilloscope software. And 3 with MATLAB data processing software to analyze the power spectrum. Experimental water and air as the working medium of the jet flow meter performance testing. Water from municipal water supply network water supply. The measured water temperature is 14.8 ℃, adjust the valves change the flow of water flow in the 0.04 × 10-3IT1/s--0.44 × 10-3m3 / s in the range of adjustment. Figure 2 by the water flow can be seen as a function of frequency, flow and frequency was a good linear relationship, linearity is good. Figure 3 shows the Strouhal number S ? a function with the Reynolds number Re, can be seen that within the entire measurement range of the number of S ? is only 0.0048 - 0.0055 between the small fluctuations that the number of S ? is a constant. Experiment, the range ratio of 10:1, the measured minimum Reynolds number 2600, can solve the low Reynolds number flow measurement, we can see from the characteristics of these components, a higher Reynolds number flow is measured The same applies, and the jet flow of a wider range than can be done to achieve the high ceiling of the range. 15_v12963O Figure 2OX10 '(m3 / s) Figure 3 experiment to test the performance of air as the medium. Air temperature is 26 ℃, by a high pressure air (performance parameters: Displacement 130m0 / h, discharge pressure 13kPa, the motor speed 2850r/min, power 750W, voltage 380V) supply. Change the flow regulating valve, air flow in the 3.0m3An ~ 9.9m3 / h within the range of adjustment, the frequency range of 27Hz ~ 90Hz (see Figure 4). Figure 4 shows the frequency of air flow and was a good linear relationship. Figure 5 shows the Strouhal and the Reynolds number Re S ? function, S ? the number of only 0.0048 - 0.0055 fluctuated between the number that S ? is a constant. 3:1 scale experiment, the measured minimum Reynolds number 38000. Measured by repeated experiments, the relative error of experimental results, in a wide flow range can be maintained at the l% to 4. Figure 4 Figure 5S ? 0.006000550.005000450.004 maintained at a constant plus or minus 0.0052. That this new structure from the vibration meter is stable, the oscillation effect is quite good. IV, Conclusion 1. Experiments show that the structure of the range than the width of the jet flow. For clean fluids, can also be used to resolve small flow and high viscosity of the fluid measurement, frequency and flow rate showed a good linear relationship. This meter no internal moving parts,[link widoczny dla zalogowanych], long life and reliability. 2. Spending components of the head loss is an important indicator of the flow meter, the meter's structure is conducive to the feedback signal to the flow in a wide range of produce stable oscillation, but the pressure loss to be bigger, therefore, reasonable structure and size selection The jet flow is critical. 3. Transmission fluid jet pipe flow by reason of vibration or other relatively large,[link widoczny dla zalogowanych], these vibrations,[link widoczny dla zalogowanych], if the work has a certain frequency, the vibration transmitted from the sensors on the pipeline will affect the actual measured signal. Therefore, the earthquake of such jet flow is poor, does not apply to vibration and electromagnetic interference such as the strong pipeline of occasions. References [1] Zhao Hanchen. Uses a wide range of fluidic flowmeter. Automation Instrumentation, 2001,22 (9) [2] Yu Xiao Yang, Guo Hua. Jet oscillator flowmeter. Scientific Instrument, 1998,[link widoczny dla zalogowanych],18 (4) [3] RFBoucher. Minimumflowoptimizationoffluidicflowmeters. Meas. sci. techno1.6 (1995) 897 ~ 879 the amount of pad QQ: 璺

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