Volume 44 Issue 1
Jan.  2023
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HU Renqiang, ZHANG Tao, LU Liuyun, XU Changyue. Study on Discharge Coefficients of Drain Orifices in Closed Cavities[J]. Applied Mathematics and Mechanics, 2023, 44(1): 61-69. doi: 10.21656/1000-0887.430100
Citation: HU Renqiang, ZHANG Tao, LU Liuyun, XU Changyue. Study on Discharge Coefficients of Drain Orifices in Closed Cavities[J]. Applied Mathematics and Mechanics, 2023, 44(1): 61-69. doi: 10.21656/1000-0887.430100

Study on Discharge Coefficients of Drain Orifices in Closed Cavities

doi: 10.21656/1000-0887.430100
  • Received Date: 2022-03-28
  • Rev Recd Date: 2022-08-27
  • Available Online: 2023-01-09
  • Publish Date: 2023-01-15
  • The discharge flow was numerically simulated to obtain discharge coefficients. The main factors influencing the discharge coefficients of orifices were studied by dimensional analysis, and the empirical fitting formulas for calculating discharge coefficients were given. The results show that, with a water head height less than 200 mm, the discharge coefficient decreases with the increase of the head height. With a water head height more than 200 mm, the discharge coefficient keeps stable around 0.61. The discharge coefficients with different thickness to diameter ratios show 2 different forms: the orifices with small thickness-diameter ratios show thin orifice flow characteristics, and the discharge coefficient is about 0.6; the orifices with big thickness to diameter ratios show thick orifice flow characteristics, and the discharge coefficient is about 0.8.

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