サイクロン集じん器内の気流について : サイクロンに関する研究第2報

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The most important factors for the operation of a cyclone dust separator are pressure loss and separation efficiency, and yet there are a few fundamental and exact investigations. We have measured the air flow in four small cyclone dust separators by means of a cylindrical pitot tube, and examined the effects of diameter and length of the cylindrical part and of the central exit pipe inserted, as well as the angle of cone, and the mode of inlet part of the separator. A horizontal type of the separator was also examined. The results give us a fundamental concept about design formula of pressure loss and efficiency of the separator, and some referential data of spiral flows. The error of the cylindrical Pitot tube in a cyclone was also studied. The remarkable results are following. 1. Radial velocity is not axially symmetrical. 2. The maximum velocity and zero statical pressure are at about 60% of the exit pipe radius r_e. 3. Pressure loss and the maximum velocity of a holizontal type are small. 4. Inner obstacles (including a guide vane and a Pitot tube) reduce pressure loss and the maximum velocity. 5. The effects of inserted length of an exit pipe are comparatively small. 6. Fomula of velocity distribution, r_θ×r^n=const. n<1,at r>0・6 r_e, where, r_θ : rotational velocity (⫩, total velocity), r : radius, r_θ=r×const. at r<0・6 r_e.
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