Accession Number : AD0023269


Title :   IMPACT PRESSURE AND TEMPERATURE PROFILES IN A NON-ISOTHERMAL JET DISCHARGING INTO A DUCT


Corporate Author : ILLINOIS UNIV AT URBANA ENGINEERING EXPERIMENT STATION


Personal Author(s) : Danielson, R D ; Kivnick, Arnold


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/023269.pdf


Report Date : 30 Sep 1953


Pagination or Media Count : 6


Abstract : A literature survey was made in an attempt to find an explanation of abnormal velocity profiles near the duct walls of air jets discharging into ducts. This choking effect was attributed to downstream air becoming entrained after returning along the duct walls. Experiments were reported in which choking appeared to be eliminated by utilizing a smooth transition entry section on the duct. These experiments were not considered proof of the choking theory, because other experiments did not support the hypothesis of returning downstream air. Simple flow theories appeared to predict air flows which were much slower than expected near the duct wall at locations close to the nozzle in a system utilizing a sudden entrance section for the secondary air. However, the pattern appeared to be normal in terms of a convergent theory.


Descriptors :   *JET FLOW , *EXHAUST PLUMES , SECONDARY , THEORY , PROFILES , ABNORMALITIES , CONVERGENCE , WALLS , HYPOTHESES , LITERATURE SURVEYS , VELOCITY , DUCTS


Subject Categories : Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE