title: Ð¡Ð¾Ð¿ÑÐ¾ÑÐ¸Ð²Ð»ÐµÐ½Ð¸Ðµ Ð¸ Ð¿ÑÐ¾Ð½Ð¸ÑÐ°ÐµÐ¼Ð¾ÑÑÑ ÑÑÑÐ±Ð¾Ð¿ÑÐ¾Ð²Ð¾Ð´Ð¾Ð² Ñ ÑÐµÑÐºÐ°Ð¼Ð¸
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: The resistance and permeability of the pipe with grids
Creators: name: ÐÐ°ÑÑÑÐ¸Ð½Ð°, ÐÐ½Ð°ÑÑÐ°ÑÐ¸Ñ
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2020
Subjects: Ð¿ÐµÑÑÐ¾ÑÐ¸ÑÐ¾Ð²Ð°Ð½Ð½Ð°Ñ ÑÐµÑÐºÐ°
ÐºÐ¾ÑÑÑÐ¸ÑÐ¸ÐµÐ½Ñ ÑÐ¾Ð¿ÑÐ¾ÑÐ¸Ð²Ð»ÐµÐ½Ð¸Ñ
ÐºÐ¾ÑÑÑÐ¸ÑÐ¸ÐµÐ½Ñ Ð¿ÑÐ¾Ð½Ð¸ÑÐ°ÐµÐ¼Ð¾ÑÑÐ¸
ÑÐ¸ÑÐ»Ð¾ Ð ÐµÐ¹Ð½Ð¾Ð»ÑÐ´ÑÐ°
perforated grid
resistance coefficient
permeability coefficient
Reynolds number

description: Ð¢ÐµÐ¼Ð° Ð²ÑÐ¿ÑÑÐºÐ½Ð¾Ð¹ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð¾Ð¹ ÑÐ°Ð±Ð¾ÑÑ: Â«Ð¡Ð¾Ð¿ÑÐ¾ÑÐ¸Ð²Ð»ÐµÐ½Ð¸Ðµ Ð¸ Ð¿ÑÐ¾Ð½Ð¸ÑÐ°ÐµÐ¼Ð¾ÑÑÑ ÑÑÑÐ±Ð¾Ð¿ÑÐ¾Ð²Ð¾Ð´Ð¾Ð² Ñ ÑÐµÑÐºÐ°Ð¼Ð¸Â». Ð Ð°Ð±Ð¾ÑÐ° Ð¿Ð¾ÑÐ²ÑÑÐµÐ½Ð° Ð¾ÑÐµÐ½ÐºÐµ Ð·Ð°Ð²Ð¸ÑÐ¸Ð¼Ð¾ÑÑÐ¸ ÐºÐ¾ÑÑÑÐ¸ÑÐ¸ÐµÐ½ÑÐ¾Ð² ÑÐ¾Ð¿ÑÐ¾ÑÐ¸Ð²Ð»ÐµÐ½Ð¸Ñ Ð¸ Ð¿ÑÐ¾Ð½Ð¸ÑÐ°ÐµÐ¼Ð¾ÑÑÐ¸ Ð¿Ð»Ð¾ÑÐºÐ¸Ñ Ð¿ÐµÑÑÐ¾ÑÐ¸ÑÐ¾Ð²Ð°Ð½Ð½ÑÑ ÑÐµÑÐµÑÐ¾Ðº Ð¾Ñ Ð¸Ñ Ð¿Ð¾ÑÐ¸ÑÑÐ¾ÑÑÐ¸ Ð¸ Ð³ÐµÐ¾Ð¼ÐµÑÑÐ¸ÑÐµÑÐºÐ¸Ñ Ð¿Ð°ÑÐ°Ð¼ÐµÑÑÐ¾Ð² Ð¾ÑÐ²ÐµÑÑÑÐ¸Ð¹.
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description: The subject of the graduate qualification work is âResistance and permeability of pipelines with gridsâ. The given work is devoted to the determination the dependence of the resistance and permeability coefficients of flat perforated grids on the porosity and geometric parameters of holes.
The work on testing flat perforated grids in the air duct was carried out in a laboratory installation at the Department of Hydraulics and Strength of St. Petersburg Polytechnic University in the period 2018-2019. The experiments were carried out in accordance with proven methods using certified equipment. The speeds were measured using an anemometer for three positions of the fan toggle switch. The pressure difference was measured using piezometers installed in the duct. The dependence of the resistance coefficients Î¶ of the grids on the Reynolds number ReD is consistent with literature. The porosity of the grid affects its resistance coefficient. Geometric parameters, such as the location of the holes, the number of holes with the same porosity nw, also affect the resistance coefficient. The transition from the resistance coefficient to the filtration coefficient is proposed. The filtration coefficient has the dimension of velocity and is preferable in practical calculations as a filtration characteristic of a pipe.