Download PDF by Ario Romiti: Fluid Dynamics of Jet Amplifiers: Course held at the

By Ario Romiti

ISBN-10: 3211811524

ISBN-13: 9783211811528

ISBN-10: 3709128803

ISBN-13: 9783709128800

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Extra info for Fluid Dynamics of Jet Amplifiers: Course held at the Department of Hydro- and Gasdynamics September 1970

Sample text

If the control flow is directed perpendicular to Pressures on atta chment walls Fig. 6 . 2 Fig. 3 59 60 Chap. VI. Coanda effect Fig. 4 the main jet, the streamlines are deflected outwardly and the jet tends to be detached. If, on the contrary, the flow is directed parallel to the wall, it tend~ to decrease the circulation in the bub- ble; in other words, it helps to evacuate the bubble by entrainment and to let attached the jet. So, when there is a perfect symmetry of the side walls with respect to the main jet issued from the nozzle, an auxiliary flow introduced perpendicularly to the right side can switch the jet on the left side, while an auxiliary flow parallel to the wall can "call" the main jet onto the same wall.

VI. Coanda effect 58 In the case of diverging side walls, the results are similar, but for the fact that the pressure p• across the jet increases faster and a greater pressure difference is quired for the same ratio b0 / b1 , ~c­ thus increasing the attach- ment effect. An even greater effect is obtained with curved diverging walls. If there are additional ducts that opens in the bubble regions, additional mass and momentum fluxes through them must be considered. A mass flow into the bubble tends to increase its pressure and to detach the jet from the wall.

The nozzle is considered to be limited by infinitely narrow parallel walls. The ~ axis is parallel to the nozzle axis S and is deplaced to correspond to the lower nozzle wall. The origin of the X. The nozzle width is axis is set on the nozzle tip. b 0 , and each mixing region (on the two sides of the axis ) has width ....... u The fully developed jet boundaries will have a pole on the ~ axis that will be at distance 'X 0 from the nozzle tip. The potential core will terminate at distance XP from the nozzle output section, and the intersection between the outer boundaries of the initial and main region of the jet bound ary layer is at distance The length xf from the same section.

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Fluid Dynamics of Jet Amplifiers: Course held at the Department of Hydro- and Gasdynamics September 1970 by Ario Romiti


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