Experimental investigation on the property of high-speed ventilated supercavitation
The submerged vehicles can achieved super-high speed by virtue of the technique of super- cavitating drag reduction. The comprehensive model experiments were conducted to research the gas entrainment property of ventilated supercavity in the high-speed water tunnel at NPU. Several dimen- sionless variables about ventilated cavity such as the gas entrainment coefficient, cavitation number and drag coefficient were investigated experimentally. The different shape and size of ventilated su- percavity that controlled by volumetric gas quantity were obtained. The amount of ventilation gas required to maintain the artificial ventilation cavity at different natural cavitation number was pre- sented. The relationships between cavitation number and gas entrainment coefficient were researched by measure quantitatively the average pressure of the cavity. In addition, the drag coefficients that at least depend on the cavitation number was also investigated experimentally. It was shown experimen- tally that increase of gas entrainment coefficient causes to increase of the cavity relative length. The lower of ventilated coefficient corresponds to the smaller natural cavitation number when the same cavity length holds. The experimental results indicated that the maximal ratio of drag reduction coefficient can exceed 85％ compared with the case of fully wetted. It can be conclude that the cavi- tator must be matched reasonably with afterbody of the given model for the sake of the optimization efficiency of drag reduction.
drag reduction ventilated supercavitation underwater vehicles experimental investi- gation
W.G.Yang Y.W.Zhang L.Kan F.Deng
College of Marine, Northwestern Polytechnical University, Xi’an 710072, China
国际会议
The Fifth International Conference on Fluid Mechanics(第五届国际流体力学会议)
上海
英文
2007-08-15（万方平台首次上网日期，不代表论文的发表时间）