直壁滑道式滑行艇阻力性能数值模拟分析
发布时间：2018-08-12 19:51
【摘要】：滑行艇是依靠航行时艇体产生的流体动压力支托大部分艇体重量的高速艇,外形较排水型艇短而宽,底部较平坦。若底和舷交接处呈尖角,形成尖舭,亦叫尖舭艇。目前,对于滑行艇的水动力性能预报相对复杂,常用船模试验方法。但是船模试验由于模型小、航速高、试验条件较为苛刻局限性强。用数值模拟方法,能科学模拟计算高速艇航行情况,经济投入小、重复性好、克服了船模试验的某些局限性。随着计算流体力学CFD的发展和完善,利用数值仿真对船舶阻力进行分析和预报备受青睐。本文对美国62系列滑行艇的艇体线型及相关阻力性能作了分析,在此基础上,选取长宽比为4.09的4667-1号滑行艇船模试验模型为研究对象,利用Gambit软件对船型进行型线建模,并基于CFD仿真理论,利用Finemarine仿真软件对建立的4667-1号滑行艇模型进行在不同航速下的数值仿真,将仿真结果与该模型的船模试验阻力值进行比较,用以验证该方法的可靠性,说明计算域的选择、网格的划分和计算参数的设置适合该艇型的数值仿真。后以该船型为母型船,派生出新的船型,直壁滑道式及普通双体滑行艇。然后应用同样的方法对派生出的直壁滑道式及普通双体型滑行艇模型进行阻力数值仿真,得到各个模型在不同工况下的仿真结果。为了更清楚的看出各个船型之间阻力仿真的区别,本文设置了各个模型之间的对比,更清楚的分析了各船型仿真结果以及阻力性能差别的原因。通过对4667-1模型的阻力仿真值对比试验值,验证了此方法的可靠性较高,误差小。并对62系列滑行艇模型和直壁滑道式滑行艇及普通滑行艇的总阻力仿真结果进行了对比分析,通过对不同模型阻力仿真结果对比得到直壁滑道式滑行艇在航速较高时通过连接体获得艇体内侧兴波和飞沫及空气形成的高速流给于的升力从而减小阻力效果明显,并且改变滑道的高度会对直壁滑道式滑行艇的阻力性能产生影响。最后根据傅汝德假定,得到直壁滑道式滑行艇每种工况下的剩余阻力系数,为直壁滑道式滑行艇的阻力估算提供较为快捷的途径。
[Abstract]:The glider is a high speed boat which depends on the hydrodynamic pressure produced by the hull to support most of the hull weight. The shape of the boat is shorter and wider than that of the drainage boat and the bottom is flat. A pointed bilge, also known as a pointed bilge, is formed at a sharp angle between the bottom and the side. At present, the hydrodynamic performance prediction of the glider is relatively complicated, and the ship model test method is commonly used. However, due to the small model, high speed and harsh test conditions, the ship model test has a strong limitation. The method of numerical simulation can be used to simulate and calculate the sailing condition of high speed craft scientifically, which has the advantages of low cost and good repeatability, which overcomes some limitations of ship model test. With the development and perfection of computational fluid dynamics (CFD), it is very popular to use numerical simulation to analyze and forecast ship resistance. In this paper, the hull alignment and relative resistance performance of American 62 series taxiboat are analyzed. On the basis of this, 4667-1 taxiboat model with aspect ratio 4.09 is selected as the research object, and the shape line model of ship form is modeled by Gambit software. Based on the theory of CFD simulation, the model of 4667-1 taxiing boat is simulated with Finemarine software at different speeds. The simulation results are compared with the resistance values of the model test to verify the reliability of the method. It is shown that the selection of computational domain, the division of meshes and the setting of calculation parameters are suitable for the numerical simulation of the boat. The new ship form, straight-wall slipway boat and ordinary catamaran taxiboat are derived. Then, the resistance numerical simulation of the derived straight wall sliding path model and the common double body gliding boat model is carried out by using the same method, and the simulation results of each model under different working conditions are obtained. In order to see the difference of resistance simulation between different ship types more clearly, this paper sets up the comparison between each model, and analyzes the simulation results of each ship type and the reason of resistance performance difference more clearly. By comparing the simulation results of 4667-1 model with the experimental results, it is proved that the proposed method has high reliability and low error. The simulation results of the total resistance of the 62 series gliding boat model and the straight-wall gliding boat and the ordinary skidding boat are compared and analyzed. By comparing the simulation results of different models of resistance, it is found that when the speed of the straight wall sliding boat is high, the lift force generated by the inside wave of the hull and the high velocity flow formed by droplet and air can be obtained by the connecting body, and the effect of reducing the resistance is obvious. And changing the height of the slide track will affect the resistance performance of the straight-wall slide boat. Finally, according to Fu Rude's assumption, the residual drag coefficient of the straight wall slide boat under each working condition is obtained, which provides a more rapid way to estimate the resistance of the straight wall slide boat.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U661.311
，
本文编号：2180177
[Abstract]:The glider is a high speed boat which depends on the hydrodynamic pressure produced by the hull to support most of the hull weight. The shape of the boat is shorter and wider than that of the drainage boat and the bottom is flat. A pointed bilge, also known as a pointed bilge, is formed at a sharp angle between the bottom and the side. At present, the hydrodynamic performance prediction of the glider is relatively complicated, and the ship model test method is commonly used. However, due to the small model, high speed and harsh test conditions, the ship model test has a strong limitation. The method of numerical simulation can be used to simulate and calculate the sailing condition of high speed craft scientifically, which has the advantages of low cost and good repeatability, which overcomes some limitations of ship model test. With the development and perfection of computational fluid dynamics (CFD), it is very popular to use numerical simulation to analyze and forecast ship resistance. In this paper, the hull alignment and relative resistance performance of American 62 series taxiboat are analyzed. On the basis of this, 4667-1 taxiboat model with aspect ratio 4.09 is selected as the research object, and the shape line model of ship form is modeled by Gambit software. Based on the theory of CFD simulation, the model of 4667-1 taxiing boat is simulated with Finemarine software at different speeds. The simulation results are compared with the resistance values of the model test to verify the reliability of the method. It is shown that the selection of computational domain, the division of meshes and the setting of calculation parameters are suitable for the numerical simulation of the boat. The new ship form, straight-wall slipway boat and ordinary catamaran taxiboat are derived. Then, the resistance numerical simulation of the derived straight wall sliding path model and the common double body gliding boat model is carried out by using the same method, and the simulation results of each model under different working conditions are obtained. In order to see the difference of resistance simulation between different ship types more clearly, this paper sets up the comparison between each model, and analyzes the simulation results of each ship type and the reason of resistance performance difference more clearly. By comparing the simulation results of 4667-1 model with the experimental results, it is proved that the proposed method has high reliability and low error. The simulation results of the total resistance of the 62 series gliding boat model and the straight-wall gliding boat and the ordinary skidding boat are compared and analyzed. By comparing the simulation results of different models of resistance, it is found that when the speed of the straight wall sliding boat is high, the lift force generated by the inside wave of the hull and the high velocity flow formed by droplet and air can be obtained by the connecting body, and the effect of reducing the resistance is obvious. And changing the height of the slide track will affect the resistance performance of the straight-wall slide boat. Finally, according to Fu Rude's assumption, the residual drag coefficient of the straight wall slide boat under each working condition is obtained, which provides a more rapid way to estimate the resistance of the straight wall slide boat.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U661.311
，
本文编号：2180177
本文链接：https://www.wllwen.com/kejilunwen/chuanbolw/2180177.html
