Effect of shroud geometry on the effectiveness of a short mixing stack gas eductor model.

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Author
Kavalis, Anastasios Emmanouil
Date
1983-06Advisor
Pucci, Paul F.
Second Reader
Cullreth, William G.
Metadata
Show full item recordAbstract
An existing apparatus for testing models of gas eductor
systems using high temperature primary flow was modified to
provide improved control and performance over a wide range of
gas temperature and flow rates. Secondary flow pumping,
temperature and pressure data were recorded for two gas
eductor system models. The first, previously tested under hot
flow conditions, consists of a primary plate with four
tilted-angled nozzles and a slotted, shrouded mixing stack
with two diffuser rings (overall L/D = 1.5). The second
consisted of the same nozzles and mixing stack, with a
modified shroud and three diffuser rings (overall L/D = 1.5).
A portable pyrometer with a surface probe was used for
the second model in order to identify any hot spots at the
external surface of the mixing stack, shroud and diffuser
rings. The second model is shown to have almost the same
mixing and pumping performance with the first one but to
exhibit much lower shroud and diffuser surface temperatures.
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