Study On The Size And Shape Of Jet Hole About Bionic Jet Drag Reduction

Along with society’s progress and development, energy shortage is increasingly becoming a primary social problem that needs to be address urgently. Aircrafts, automobiles,ships, etc are all need to consume a great deal of energy, so the reduction of surface frictional resistance is a reasonable design proposal for effective means of energy conservation.The introduction of Bionics theory in drag reduction methods as become a hotspot of recent research in china as well as overseas. Imitation shark gills jet behavior, puts forward a new type of bionic drag reduction; bionic jet drag reduction. On this basis, the bionic jet model is set up to primarily study the bionic jet hole shape and size effect on drag reduction effect.Based on engineering practices, this paper puts forward a full study of biological shark gill specimens and parameter simplification to establish a bionic jet model. With single hole flat jet as the research focus, the GAMBIT software was used to generate a reasonably accurate mesh. The meshed model was then numerical analyzed using the FLUENT software.Improved numerical results were obtained by factoring the turbulence model, initial conditions and boundary conditions into the analysis.The second section of this paper analyzed the effect of jet hole shape; curvature, width,length on drag reduction. From the results, the relationship between hole shape and size factors and the influence on drag reduction effect was determined, and the best jet hole design for drag reduction effect was presented. Additionally the mechanism of drag reduction present discussed.The third section exposed jet holes to different flow field conditions, to analyze and compare drag reduction mechanism of typical jet hole. The field conditions considered were main-flow-field and jet velocity. From the system consumption perspective an energy-saving evaluation standard was then established for jet systems in a typical bionic model.Finally, validation was done using on some typical jet holes test samples and a small scale drag reduction testing platform. Comparisons were then made between the numerical simulation results and experimental results to determine model error.