Review article

Regulation of the air cushionat a sewer network of the siphon type

UDC: 

628.31

DOI: 

10.23968/1999-5571-2021-18-4-91-99

Pages: 

91-99

Annotation: 

In order to improve the energy efficiency and environmental safety of the main sewerage system, it is recommended to use the air cushion effect. This effect will allow flushing the system, removing the air to the air purification unit in an orderly manner, lifting the sewage due to the pressure in the air cushion. For provision of reliable operation of the sewer network, it is necessary to maintain the required level of wastewater in the conditions of constantly changing gas-air flow rate. The paper proposes the design of the air cushion control unit, which operates on the basis of a triangular spillway. This design allows making the system self-regulating, automatically removing excess gas-air environment. The jet stream on the spillway moves under the condition of a changing cross-section of the outlet orifice. This condition fundamentally distinguishes the outflow of the air from the existing research in the field of underwater air and gas jets. Therefore, this is the basis for conducting our own research to assess the capacity of a triangular shaped spillway. The study of the jet stream was performed using the ANSYS CFX program. Model calculations were carried out for the range of air flow rate from 0.0078 to 1 l / s. There was used the π-theorem to evaluate the operation of the spillway in a different flow range and at different values of the inclination angle of the edge α. The results of the study can be used in practice to develop a control unit and implement a sewage system operating in the air cushion mode.

Authors: 

Fedorov S. V. Saint Petersburg State University of Architecture and Civil Engineering St. Petersburg, Russia

Vasilyev V. M. Saint Petersburg State University of Architecture and Civil Engineering St. Petersburg, Russia

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