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Aviation History
1922
1922 - 0315.PDF
JUNE I, 1922 Z0^ FLOW TESTS ON SLOTTED AEROFOILS Some Experiments Carried Out by Herr Lachmann at Gottingen ALTHOUGH the action of the air over a slotted plane is under stood in a general way, the theory of this type of aerofoil is not as yet susceptible of complete mathematical treatment, and a good deal of further research is required before we can -claim thoroughly to understand what really takes place. In order to discover more about the nature of the flow, Herr Lachmann, who, it will be remembered, invented the slotted aerofoil in Germany at the same time as did Mr. Handley Page in this country, has carried out some tests -at the Gottingen Laboratory on a slotted aerofoil. The tests were arranged to show, by means of sal-ammoniac smoke blown across the aerofoil, the behaviour of the eddies at various points and at various angles and velocities, and some very- interesting results were obtained. In Fig. 1 of the accompanying photographs -may be seen the apparatus used for producing the smoke. The flask on the right-hand side contains hydrochloric acid, while the flask in the middle holds a quantity of ammonia. These two flasks stand in a bed of water warmed by a Bunsen burner to assist vaporisation. The flask on the left serves as a reservoir, and from it there is connection with a tube fitted with one or more jets through which the sal-ammoniac FLOW TESTS ON SLOTTED AEROFOILS : Photographs showing various forms of air flow over model tested at the Gottingen Laboratory. 315
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