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22.10.2012 20:43:55
23.08.2011
03.11.2009
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10.4. Investigation of the effect profile of the lateral surface of the work item on the value of UAI.

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In order to increase efficiency WHD-2 installation when converting the kinetic energy of air flow into useful work during the transition of zero angle of attack, it was decided to optimize the profile of the lateral surface of the work item to make it convex.
It was assumed that this will give rise to additional UAI at the time of the transition of the zero angle of attack, which will increase the output power and efficiency of the installation.
Aerodynamic calculation was performed, the results of which was chosen the most optimal in terms of aerodynamics in aircraft profile work item NASA0012.
Were also made three working element having a width of the middle part of the profile along the length of 20 mm, 50 mm and 100 mm. The front and rear edges of the work items remained acute (less than 2 mm.).
The plan was first to conduct preliminary research work items with a conventional convex profile, production of which is not difficult, the results of which could produce a work item with a profile NASA0012 with possible adjustment.
For the purity of the experiment, in order to eliminate the influence of neighboring UAI work items, the study was conducted during the interaction of a set of work item WHD-2 having a convex profile, with a stream of air from the fan.
The test results were negative: when placing a work item with a convex profile (width 20 mm.) In the air flow and using the maximum angle of attack of L with the air flow very slowly, working element made forward movement until such time as the corner of L does not accept a null value, and to stop.
In further studies, an increase in the width of the middle part of the profile of the lateral surface of 50 mm and 100 mm., The velocity of the work item specified with a maximum angle of attack slowed down even more.
According to test results, it was decided to manufacture a work item to the profile of the lateral surface NASA0012 in this paper refuse.

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