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Numerical study of a ventilation system based on wall confluent jets
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för bygg- energi- och miljöteknik, Energisystem. Department of Management and Engineering, Linköping University, Linköping, Sweden .
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för bygg- energi- och miljöteknik, Energisystem. Department of Management and Engineering, Linköping University, Linköping, Sweden .ORCID-id: 0000-0003-3472-4210
2014 (Engelska)Ingår i: ASHRAE Transactions, ASHRAE , 2014, s. 272-284Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

This study presents a numerical investigation of an air supply device based on wall confluent jets in a ventilated room. Confluent jets can be described as multiple round jets issuing from supply device apertures. The jets converge, merge, and combine at a certain distance downstream from the supply device and behave as a united jet or so-called "confluent "jets. The numerical predictions of the velocity flow field of isothermal confluent jets with three Reynolds-averaged Navier-Stokes (RANS) turbulence models (RNG k-ε, realizable k-ε, and SST k - ω) are reported in the present study. The results of the numerical predictions are verified with detailed experimental measurements by hot-wire anemometer and constant-temperature anemometers for two airflow rates. The box method is used to provide the inlet boundary conditions. The study of the airflow distribution showed that a primary wall jet (wall confluent jet) exists close to the supply device along the wetted-wall and a secondary wall jet is created after the stagnation region along the floor. It is presented that the flow field of the primary and secondary wall jet predicted by turbulence models is in good agreement with the experimental data. The current study is also compared with the literature in terms of the velocity decay and the spreading rate of the primary and secondary wall jet, the results of which are consistent with each other. Velocity decay and the spreading rate of the secondary wall jet in vertical and lateral directions were studied for different inlet airflow rates and inlet discharge heights. The comparative results demonstrate that the flow behavior is nearly independent of the inlet flow rate. Inlet discharge height is found to have impact close to the inlet, where the velocity decays faster when the jet discharges at a higher level. The decay tendency is similar as the jet enters into the room for all discharge heights. 

Ort, förlag, år, upplaga, sidor
ASHRAE , 2014. s. 272-284
Serie
ASHRAE Transactions, ISSN 0001-2505 ; 120
Nyckelord [en]
Air, Anemometers, Flow fields, Forecasting, Jets, Navier Stokes equations, Oceanography, Turbulence models, Turbulent flow, Velocity, Ventilation, Airflow distribution, Constant-temperature anemometers, Hot wire anemometers, Numerical investigations, Numerical predictions, Reynolds-Averaged Navier-Stokes, Stagnation regions, Ventilation systems, Fighter aircraft
Nationell ämneskategori
Strömningsmekanik och akustik
Identifikatorer
URN: urn:nbn:se:hig:diva-20078Scopus ID: 2-s2.0-84937834516ISBN: 978-193650482-4 (tryckt)OAI: oai:DiVA.org:hig-20078DiVA, id: diva2:844941
Konferens
2014 ASHRAE Annual Conference, 28 June-2 July 2014, Seattle, USA
Tillgänglig från: 2015-08-10 Skapad: 2015-08-10 Senast uppdaterad: 2018-03-13Bibliografiskt granskad

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