Graduate Thesis Or Dissertation
 

An experimental study of plane jets issuing at various angles into a cross-flow

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  • An experimental study of the properties of plane jets issuing at various angles into a cross-flow of air was conducted to obtain information relating to the momentum diffusion properties of the jet flow in order to provide a background for predicting the feasibility of the preswirl concept of the Volumetric Air Heating Receiver, an advanced solar central receiver concept. The properties investigated included the deflection of the jet axis, the decay of velocity along the jet axis, and the determination of similarity characteristics of the jet velocity profiles. Experiments were carried out for three different jetto- cross-flow velocity ratios (R = 4.0, 5.1, 6.2) and angles (θ = 90°, 75°, 60° ). Hot film anemometry was used to determine velocity magnitudes. Correlation of the data obtained revealed that the jet axes for the 90 degree angle correlated very well when the non-dimensional spatial coordinates were reduced by R² whereas the axes for the 75 and 60 degree angles correlated well when their coordinates were reduced by R. This suggested that there was a prominence of momentum effects for the smaller angles, as opposed to a prominence of energy (inertia) effects for the normal jet. The decay of excess non-dimentional velocity for all experimental conditions was very well correlated when the non-dimentional natural coordinate (jet axis) was reduced by R, the relationship between the two being very nearly linear with a -0.77 power of s/hR. The velocity profile data obtained proved to be impossible to correlate and no conclusions on velocity profile similarity could be drawn. The jet axis and velocity decay correlations proved useful in concluding that the preswirl concept for the V.A.H.R. could be feasible given large enough velues of jet velocity ratio and jet orifice apperture, in order, however, to be possible to draw any definite conclusions for the receiver design, a scaled model of the V.A.H.R. would need to be constructed and tested.
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