Abstract
Measurements of mean velocity, turbulence rate and velocity fluctuations were performed in a constant area combustion chamber, where a premixed air-methane flow is ignited and stabilized by a parallel flow of hot gases acting as a pilot flame. The combustion produces an acceleration of the flow and transverse velocity gradients. Turbulence increases as the combustion develops, velocity fluctuations being maximum in the reaction zone. The influence of the inlet turbulence intensity and the velocity ratio between main stream and hot jet have been investigated; generally speaking, the phenomena are similar. The r.m.s. transverse velocity fluctuation obtained during the tests does not seem to be increased by combustion, and the Reynolds stress u ′ υ ′ ¯ is significant only in the neighborhood of the mixing zone. The numerical prediction of mean velocity and velocity fluctuation leads to a fairly satisfactory agreement with experimental results; the turbulence increase in the combustion zone seems to be closely related to the velocity gradient produced by the flame.
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