title: ÐÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ðµ Ð°Ð²ÑÐ¾ÐºÐ¾Ð»ÐµÐ±Ð°Ð½Ð¸Ð¹ Ð¿Ð°ÑÑ Ð¿ÑÐ¸ÑÐ¾ÑÐ½ÑÑ ÑÑÑÑÐ¹ Ð² Ð²ÐµÐ½ÑÐ¸Ð»Ð¸ÑÑÐµÐ¼Ð¾Ð¹ ÐºÐ°Ð¼ÐµÑÐµ Ð¿ÑÑÐ¼Ð¾ÑÐ³Ð¾Ð»ÑÐ½Ð¾Ð³Ð¾ ÑÐµÑÐµÐ½Ð¸Ñ
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: Study of self-oscillating twin jets in a ventilated rectangular chamber
Creators: name: ÐÐ°Ð±Ð¸Ð½ÑÐµÐ²Ð°, 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: 2024
Subjects: Ð²ÐµÐ½ÑÐ¸Ð»Ð¸ÑÑÐµÐ¼Ð°Ñ Ð¿Ð¾Ð»Ð¾ÑÑÑ
Ð°Ð²ÑÐ¾ÐºÐ¾Ð»ÐµÐ±Ð°Ð½Ð¸Ñ ÑÑÑÑÐ¸
Ð¿Ð°ÑÐ° Ð¿ÑÐ¸ÑÐ¾ÑÐ½ÑÑ ÑÑÑÑÐ¹
URANS Ð¿Ð¾Ð´Ñ Ð¾Ð´
ventilation cavity
self-oscilations
self-oscillating twin jets
URANS modeling

description: Ð Ð°Ð±Ð¾ÑÐ° Ð¿Ð¾ÑÐ²ÑÑÐµÐ½Ð° Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ ÑÑÑÑÐºÑÑÑÑ ÑÐµÑÐµÐ½Ð¸Ñ Ð² Ð¾Ð³ÑÐ°Ð½Ð¸ÑÐµÐ½Ð½Ð¾Ð¹ Ð¿ÑÑÐ¼Ð¾ÑÐ³Ð¾Ð»ÑÐ½Ð¾Ð¹ ÐºÐ°Ð¼ÐµÑÑ (Ð¿Ð¾Ð»Ð¾ÑÑÐ¸) Ñ ÑÐ°Ð·Ð¼ÐµÑÐ°Ð¼Ð¸ 250Ñ585Ñ40 Ð¼Ð¼3 Ð² ÐºÐ¾ÑÐ¾ÑÑÑ Ð¿Ð¾Ð´Ð°ÐµÑÑÑ Ð¾Ð´Ð½Ð° Ð¸Ð»Ð¸ Ð´Ð²Ðµ ÑÑÑÑÐ¸. Ð¡ÑÑÑÐ¸ Ð¿Ð¾Ð´Ð°ÑÑÑÑ Ð¸Ð· Ð¾Ð´Ð½Ð¾Ð¹ Ð¸Ð»Ð¸ Ð´Ð²ÑÑ Ð¿Ð°ÑÐ°Ð»Ð»ÐµÐ»ÑÐ½ÑÑ ÑÑÑÐ± ÐºÐ²Ð°Ð´ÑÐ°ÑÐ½Ð¾Ð³Ð¾ 14Ñ14 Ð¼Ð¼2 ÑÐµÑÐµÐ½Ð¸Ñ Ð¸Ð»Ð¸ Ð¸Ð· Ð¾Ð´Ð½Ð¾Ð¹ ÑÑÑÐ±Ñ Ð¿ÑÑÐ¼Ð¾ÑÐ³Ð¾Ð»ÑÐ½Ð¾Ð³Ð¾ 28Ñ14 Ð¼Ð¼2 Ð¿Ð¾Ð¿ÐµÑÐµÑÐ½Ð¾Ð³Ð¾ ÑÐµÑÐµÐ½Ð¸Ñ. ÐÐ»Ð¸Ð½Ð° ÑÑÑÐ±Ñ Ð·Ð°Ð´Ð°Ð½Ð° ÑÐ°Ð²Ð½Ð¾Ð¹ 95 Ð¼Ð¼. ÐÑÐ¸ Ð¿Ð¾Ð´Ð°ÑÐµ Ð´Ð²ÑÑ ÑÑÑÑÐ¹ Ð² Ð¿Ð¾Ð»Ð¾ÑÑÑ Ð²Ð°ÑÑÐ¸ÑÐ¾Ð²Ð°Ð»Ð¾ÑÑ ÑÐ°ÑÑÑÐ¾ÑÐ½Ð¸Ðµ Ð¼ÐµÐ¶Ð´Ñ ÑÑÑÐ±Ð°Ð¼Ð¸ S, ÑÐ°Ðº, ÑÑÐ¾ Ð²ÐµÐ»Ð¸ÑÐ¸Ð½Ð° S/d Ð·Ð°Ð´Ð°Ð²Ð°Ð»Ð°ÑÑ ÑÐ°Ð²Ð½Ð¾Ð¹ 2, 3, 4, 5. ÐÐ½Ð°ÑÐµÐ½Ð¸Ðµ ÑÐ¸ÑÐ»Ð° Ð ÐµÐ¹Ð½Ð¾Ð»ÑÐ´ÑÐ°, Ð¿Ð¾ÑÑÑÐ¾ÐµÐ½Ð½Ð¾Ð³Ð¾ Ð¿Ð¾ Ð²ÑÐ¾Ð´Ð½Ð¾Ð¹ ÑÐºÐ¾ÑÐ¾ÑÑÐ¸ 1.875 Ð¼/Ñ, Ð¿ÑÐ¸Ð½Ð¸Ð¼Ð°Ð»Ð¾ÑÑ ÑÐ°Ð²Ð½ÑÐ¼ 27 000. ÐÐ¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ Ð¿ÑÐ¾Ð²ÐµÐ´ÐµÐ½Ð¾ Ð² Ð¿Ð°ÐºÐµÑÐµ ANSYS Fluent 2021. Ð¢ÐµÑÐµÐ½Ð¸Ðµ Ð¾Ð¿Ð¸ÑÑÐ²Ð°Ð»Ð¾ÑÑ Ð½Ð° Ð¾ÑÐ½Ð¾Ð²Ðµ URANS Ð¿Ð¾Ð´ÑÐ¾Ð´Ð° Ñ Ð¸ÑÐ¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°Ð½Ð¸ÐµÐ¼ k-w SST Ð¼Ð¾Ð´ÐµÐ»Ð¸ ÑÑÑÐ±ÑÐ»ÐµÐ½ÑÐ½Ð¾ÑÑÐ¸. ÐÑÐ¸ Ð¿Ð¾Ð´Ð°ÑÐµ Ð¾Ð´Ð¸Ð½Ð¾ÑÐ½Ð¾Ð¹ ÑÑÑÑÐ¸ Ð² Ð¿Ð¾Ð»Ð¾ÑÑÑ Ð¸Ð· ÑÑÑÐ±Ñ ÐºÐ²Ð°Ð´ÑÐ°ÑÐ½Ð¾Ð³Ð¾ ÑÐµÑÐµÐ½Ð¸Ñ ÑÐ¾ÑÐ¼Ð¸ÑÑÑÑÑÑ ÐµÐµ Ð°Ð²ÑÐ¾ÐºÐ¾Ð»ÐµÐ±Ð°Ð½Ð¸Ñ Ñ ÑÐ°ÑÑÐ¾ÑÐ¾Ð¹ 0.16 c-1, ÑÑÐ¾ ÑÐ¾Ð¾ÑÐ²ÐµÑÑÑÐ²ÑÐµÑ ÑÐ¸ÑÐ»Ñ Ð¡ÑÑÑÑÐ°Ð»Ñ Sh = 0.011. ÐÐ¾Ð»ÑÑÐµÐ½Ð½ÑÐµ ÑÐµÐ·ÑÐ»ÑÑÐ°ÑÑ ÑÐ¾ÑÐ¾ÑÐ¾ ÑÐ¾Ð³Ð»Ð°ÑÑÑÑÑÑ Ñ Ð´Ð°Ð½Ð½ÑÐ¼Ð¸ ÑÐ°ÑÑÐµÑÐ¾Ð² Mosavati R.M. Ð¸ Ð´Ñ. (2020 Ð³.), Ð²ÑÐ¿Ð¾Ð»Ð½ÐµÐ½Ð½ÑÑ Ð´Ð»Ñ ÑÑÑÐ±Ñ ÐºÐ²Ð°Ð´ÑÐ°ÑÐ½Ð¾Ð³Ð¾ Ð¸ ÐºÑÑÐ³Ð»Ð¾Ð³Ð¾ ÑÐµÑÐµÐ½Ð¸Ð¹, Ð¸ ÑÐºÑÐ¿ÐµÑÐ¸Ð¼ÐµÐ½ÑÐ° Lawson N.J. (2001 Ð³.), Ð² ÐºÐ¾ÑÐ¾ÑÐ¾Ð¼ Ð¸ÑÐ¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°Ð»Ð°ÑÑ ÑÑÑÐ±Ð° ÐºÑÑÐ³Ð»Ð¾Ð³Ð¾ ÑÐµÑÐµÐ½Ð¸Ñ. ÐÐ¾ÐºÐ°Ð·Ð°Ð½Ð¾, ÑÑÐ¾ Ð¿ÑÐ¸ Ð¿Ð¾Ð´Ð°ÑÐµ Ð¾Ð´Ð¸Ð½Ð¾ÑÐ½ÑÑ ÑÑÑÑÐ¹ Ð¸Ð· ÑÑÑÐ± ÐºÐ²Ð°Ð´ÑÐ°ÑÐ½Ð¾Ð³Ð¾ Ð¸ Ð¿ÑÑÐ¼Ð¾ÑÐ³Ð¾Ð»ÑÐ½Ð¾Ð³Ð¾ ÑÐµÑÐµÐ½Ð¸Ð¹ ÑÐ¸ÑÐ»Ð¾ Ð¡ÑÑÑÑÐ°Ð»Ñ Ð¾ÐºÐ°Ð·ÑÐ²Ð°ÐµÑÑÑ Ð¿Ð¾ÑÑÐ¾ÑÐ½Ð½ÑÐ¼, ÐµÑÐ»Ð¸ ÑÐ°ÑÑÐ¾Ð´ Ð² Ð´Ð²ÑÑ Ð²Ð°ÑÐ¸Ð°Ð½ÑÐ°Ñ Ð¾Ð´Ð¸Ð½Ð°ÐºÐ¾Ð²ÑÐ¹. ÐÑÐ¸ Ð·Ð°Ð´Ð°Ð½Ð¸Ð¸ Ð¾Ð´Ð¸Ð½Ð°ÐºÐ¾Ð²Ð¾Ð¹ Ð²ÑÐ¾Ð´Ð½Ð¾Ð¹ ÑÐºÐ¾ÑÐ¾ÑÑÐ¸ ÑÐ¸ÑÐ»Ð¾ Ð¡ÑÑÑÑÐ°Ð»Ñ Ð´Ð»Ñ Ð²Ð°ÑÐ¸Ð°Ð½ÑÐ° Ñ ÑÑÑÐ±Ð¾Ð¹ Ð¿ÑÑÐ¼Ð¾ÑÐ³Ð¾Ð»ÑÐ½Ð¾Ð³Ð¾ ÑÐµÑÐµÐ½Ð¸Ñ Ð² 1.2 ÑÐ°Ð·Ð° Ð¼ÐµÐ½ÑÑÐµ, ÑÐµÐ¼ Ð´Ð»Ñ Ð²Ð°ÑÐ¸Ð°Ð½ÑÐ° Ñ ÑÑÑÐ±Ð¾Ð¹ ÐºÐ²Ð°Ð´ÑÐ°ÑÐ½Ð¾Ð³Ð¾ ÑÐµÑÐµÐ½Ð¸Ñ. ÐÑÐ¸ Ð¿Ð¾Ð´Ð°ÑÐµ Ð¿Ð°ÑÑ ÑÑÑÑÐ¹ Ð² Ð¿Ð¾Ð»Ð¾ÑÑÑ ÑÐ°ÐºÐ¶Ðµ ÑÐ¾ÑÐ¼Ð¸ÑÑÑÑÑÑ Ð°Ð²ÑÐ¾ÐºÐ¾Ð»ÐµÐ±Ð°Ð½Ð¸Ñ. ÐÑÐ¸ S/d =&lt; 4 Ð´Ð²Ðµ ÑÑÑÑÐ¸ ÑÐ»Ð¸Ð²Ð°ÑÑÑÑ Ð² ÐµÐ´Ð¸Ð½ÑÑ ÑÑÑÑÑ, Ð·Ð½Ð°ÑÐµÐ½Ð¸Ñ ÑÐ¸ÑÐ»Ð° Ð¡ÑÑÑÑÐ°Ð»Ñ Ð¸Ð·Ð¼ÐµÐ½ÑÑÑÑÑ Ð² Ð´Ð¸Ð°Ð¿Ð°Ð·Ð¾Ð½Ðµ 0.011...0.016. ÐÑÐ¸ Ð±Ð¾Ð»ÑÑÐµÐ¼ ÑÐ°ÑÑÑÐ¾ÑÐ½Ð¸Ð¸ Ð¼ÐµÐ¶Ð´Ñ ÑÑÑÐ±Ð°Ð¼Ð¸, Ð² ÑÐ¾Ð¼ ÑÐ¸ÑÐ»Ðµ Ð¿ÑÐ¸ S/d = 4 (Ð´Ð»Ñ Ð¸Ð·Ð¼ÐµÐ½ÐµÐ½Ð½ÑÑ Ð½Ð°ÑÐ°Ð»ÑÐ½ÑÑ ÑÑÐ»Ð¾Ð²Ð¸Ð¹), ÐºÐ¾Ð»ÐµÐ±Ð°Ð½Ð¸Ñ Ð´Ð²ÑÑ ÑÑÑÑÐ¹ Ð½Ð°ÑÐ¾Ð´ÑÑÑÑ Ð² Ð¿ÑÐ¾ÑÐ¸Ð²Ð¾ÑÐ°Ð·Ðµ Ð¸ Ð¾ÑÑÑÐµÑÑÐ²Ð»ÑÑÑÑÑ Ð¾ÑÐ´ÐµÐ»ÑÐ½Ð¾ Ð¼ÐµÐ¶Ð´Ñ Ð±Ð¾ÐºÐ¾Ð²ÑÐ¼Ð¸ ÑÑÐµÐ½ÐºÐ°Ð¼Ð¸ Ð¸ ÑÐµÐ½ÑÑÐ°Ð»ÑÐ½ÑÐ¼ ÑÐµÑÐµÐ½Ð¸ÐµÐ¼ Ð¿Ð¾Ð»Ð¾ÑÑÐ¸.
description: The given work is devoted to the study of the flow structure in a narrow cavity with dimensions of 250x585x40 mm3 into which one or twin jets are spreading. The jets are emanating from one or two parallel square (14x14 mm2) or rectangle (28x14 mm2) cross section nozzles. The pipe length is 95 mm. When twin jets are spreading into the cavity, the distance between the pipes S is changing, so that the value of S/d is set to 2, 3, 4, 5. Reynolds number is 27 000 based on inlet velocity 1.875 m/s and diameter (d). Numerical modeling was carried out in the ANSYS Fluent 2021 package. The flow was described on the basis of the URANS approach using the k-w SST turbulence model. When a single jet is emanating into the cavity from a square section pipe, the self-oscillations are formed with a frequency of 0.16 s-1, which corresponds to the Strouhal number Sh = 0.011. The results obtained are in good agreement with the data of calculations by Mosavati R.M. et al. (2020), performed for square and round pipes, and experimental by Lawson N.J. (2001), in which a round pipe was used. It is shown that when single jets are emanating from pipes of square and rectangular cross section nozzles, the Strouhal number turns out to be constant if the flow rate is the same in two variants. When setting the same inlet velocity, the Strouhal number for the variant with a rectangular pipe cross section is 1.2 times less than for the variant with a square pipe section. When twin jets are emanating into the cavity, self-oscillations are also formed. At S/d =&lt; 4, twin jets merge into a single jet, the values of the Strouhal number vary in the range of 0.011...0.016. At a bigger distance between the pipes, including at S/d = 4 (for modified initial conditions), the oscillations of the twin jets are in antiphase and are carried out separately between the side walls and the central section of the cavity.