科研之友
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摘要
In order to study drag reduction characteristics of jet surface, a method of the coaxial swirling test was presented, and a mathematical model of the relationship between the coaxial swirling test and the frictional resistance of the model surface under plane test was established. Also, the drag reduction test system of the jet surface was constructed. Using the experiment of the axisymmetrical model of jet surface, the drag reduction characteristics under the circumstance of jet velocity coupling with jet diameter, jet angle and rotating speed were considered, and the experimental results and numerical simulation results were analysised comparatively. The results show that the jet surface have a better drag reduction under a certain conditions. According to the size of the order, the effects of factors on the experiment index is jet diameter (A), jet angle (B) and jet speed (D) successively, and the optimal case is A2B2D3, whose drag reduction efficiency is 8.565%. The creditability of experimental results and the accuracy of modeling are demonstrated by analysing the model experimental value and the numerical simulation values relatively.
