高速滑行艇喷溅阻力的数值计算与分析方法研究
发布时间：2018-10-17 12:52
【摘要】：传统排水型船的重量由静水力支持,而滑行艇的重量是由水动力和静水力联合支持,滑行艇在高速航行时伴随着强烈的喷溅现象,对滑行艇的航行阻力及运动性能产生显著影响。精确模拟滑行艇的喷溅及确定喷溅阻力对于确定艇体受到的动载荷及艇型的优化具有十分重要的意义。本文采用与滑行艇试验艇型相同的三维棱柱型滑行艇模型,针对棱柱型滑行艇在静水中约束航行及在波浪中约束航行进行了数值模拟与分析。利用Fluent软件对滑行艇约束模式下纵倾角τ=3.0°、5.0°,航速V=1.0m/s~6.0m/s共计12个工况进行了数值模拟,完成了棱柱型滑行艇在静水中约束航行的水动力特性研究,分析了不同纵倾角不同航速下滑行艇的阻力、周围流场、艇底动压等,并将数值计算结果与试验相比较,吻合较好。当航速V?2m/s时,阻力数值计算值与试验值误差小于5%,说明该数值模拟方法在研究较高体积傅汝德数时具有较好的计算精度。根据棱柱型滑行艇在静水中约束模式下的数值模拟结果,完成了棱柱型滑行艇在静水中约束航行的喷溅特性研究,分析了滑行艇喷溅面积、艇底静压等参数的变化特性,通过自编后处理程序绘制出滑行艇喷溅区的形状,并计算出喷溅面积及喷溅阻力。喷溅区平均速度与航速之间近似满足线性关系,纵倾角τ=3.0°下喷溅阻力占总阻力的12%~19%,纵倾角τ=5.0°下喷溅阻力占总阻力的25%~30%。通过速度边界造波方法,实现波浪环境的模拟,对滑行艇以一定航速,在波长为2.1m、波高为0.2m的波浪中航行进行了数值模拟,选取纵倾角τ=5.0°,航速V=0m/s~5.0m/s共计6个工况,开展了计及空气载荷作用下棱柱型滑行艇在波浪中约束航行的喷溅特性研究,分析了滑行艇的艇底静压、艇底水相体积分数分布等,绘制出滑行艇喷溅区的形状,计算得到不同航速下滑行艇的喷溅阻力。航速V=0m/s时,喷溅阻力非常小,可以忽略不计;其余航速下,在波浪中滑行艇的喷溅阻力占总阻力比例RS/R的峰值约在10%左右。根据滑行艇喷溅现象发生的内部机理及国内外相关试验归纳出的经验公式,本文提出喷溅区的分离方法,并推导出喷溅区几何参数及喷溅阻力的计算公式,最终建立棱柱型滑行艇喷溅参数及喷溅阻力的计算模型与方法,为滑行艇喷溅阻力的研究提供了一种可行的研究分析方法。
[Abstract]:The weight of the traditional drainage ship is supported by hydrostatic force, while the weight of the taxiboat is supported by hydrodynamic and hydrostatic forces. It has a significant effect on the navigation resistance and motion performance of the taxiboat. It is very important to accurately simulate the spatter of the glider and determine the splash resistance for determining the dynamic load on the hull and the optimization of the boat type. In this paper, a three dimensional prismatic boat model, which is the same as the taxiboat test boat, is used to simulate and analyze the constraint navigation of the prismatic boat in the still water and in the wave. Using Fluent software, the longitudinal inclination 蟿 = 3.0 掳, 5.0 掳and speed V=1.0m/s~6.0m/s were numerically simulated under 12 working conditions in the constrained mode of the glider, and the hydrodynamic characteristics of the prismatic glider were studied in the static water. The resistance, surrounding flow field and bottom dynamic pressure of the taxiboat with different longitudinal inclination angles and different speeds are analyzed. The numerical results are in good agreement with the test results. When the speed is V?2m/s, the error between the numerical calculation value of resistance and the experimental value is less than 5, which shows that the numerical simulation method has better calculation accuracy in the study of higher volume Fourier number. According to the numerical simulation results of the prismatic glider in the static water constraint mode, the spray characteristics of the prismatic glider in the static water are studied, and the variation characteristics of the parameters such as the splash area and the static pressure of the bottom of the boat are analyzed. The shape of spatter area of the glider boat was plotted by a self-compiled post-processing program, and the spray area and the splash resistance were calculated. The average velocity of spatter zone is approximately linear to the speed of navigation, and the splash resistance occupies 12 / 19 of the total resistance at the longitudinal inclination 蟿 = 3.0 掳, and the splash resistance occupies 2530% of the total resistance at the dip angle 蟿 = 5.0 掳. The wave environment is simulated by the method of velocity boundary wave-making, and a numerical simulation is carried out for the taxiboat sailing at a certain speed in a wave with a wavelength of 2.1 m and a wave height of 0.2 m. The longitudinal inclination 蟿 is chosen to be 5.0 掳, and the speed of V=0m/s~5.0m/s is 6 working conditions. In this paper, the spray characteristics of prismatic gliding boat under the action of air load in the wave are studied. The hydrostatic pressure at the bottom of the boat and the distribution of the volume fraction of the bottom water of the boat are analyzed, and the shape of the spray zone of the gliding boat is plotted. The spatter resistance of the taxiboat at different speeds is calculated. At V=0m/s speed, the splash resistance is very small and can be ignored, and the peak value of the splash resistance of the taxiboat in the wave is about 10% of the total resistance ratio under the other speeds. Based on the internal mechanism of the spatter phenomenon of the glider boat and the empirical formula summarized from the relevant tests at home and abroad, the separation method of the splash zone is proposed, and the formulas for calculating the geometric parameters of the spray zone and the splash resistance are derived. Finally, the calculation model and method of splashing parameters and splash resistance of prismatic glider are established, which provides a feasible research and analysis method for the study of splash resistance of gliding 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】：U674.942
本文编号：2276720
[Abstract]:The weight of the traditional drainage ship is supported by hydrostatic force, while the weight of the taxiboat is supported by hydrodynamic and hydrostatic forces. It has a significant effect on the navigation resistance and motion performance of the taxiboat. It is very important to accurately simulate the spatter of the glider and determine the splash resistance for determining the dynamic load on the hull and the optimization of the boat type. In this paper, a three dimensional prismatic boat model, which is the same as the taxiboat test boat, is used to simulate and analyze the constraint navigation of the prismatic boat in the still water and in the wave. Using Fluent software, the longitudinal inclination 蟿 = 3.0 掳, 5.0 掳and speed V=1.0m/s~6.0m/s were numerically simulated under 12 working conditions in the constrained mode of the glider, and the hydrodynamic characteristics of the prismatic glider were studied in the static water. The resistance, surrounding flow field and bottom dynamic pressure of the taxiboat with different longitudinal inclination angles and different speeds are analyzed. The numerical results are in good agreement with the test results. When the speed is V?2m/s, the error between the numerical calculation value of resistance and the experimental value is less than 5, which shows that the numerical simulation method has better calculation accuracy in the study of higher volume Fourier number. According to the numerical simulation results of the prismatic glider in the static water constraint mode, the spray characteristics of the prismatic glider in the static water are studied, and the variation characteristics of the parameters such as the splash area and the static pressure of the bottom of the boat are analyzed. The shape of spatter area of the glider boat was plotted by a self-compiled post-processing program, and the spray area and the splash resistance were calculated. The average velocity of spatter zone is approximately linear to the speed of navigation, and the splash resistance occupies 12 / 19 of the total resistance at the longitudinal inclination 蟿 = 3.0 掳, and the splash resistance occupies 2530% of the total resistance at the dip angle 蟿 = 5.0 掳. The wave environment is simulated by the method of velocity boundary wave-making, and a numerical simulation is carried out for the taxiboat sailing at a certain speed in a wave with a wavelength of 2.1 m and a wave height of 0.2 m. The longitudinal inclination 蟿 is chosen to be 5.0 掳, and the speed of V=0m/s~5.0m/s is 6 working conditions. In this paper, the spray characteristics of prismatic gliding boat under the action of air load in the wave are studied. The hydrostatic pressure at the bottom of the boat and the distribution of the volume fraction of the bottom water of the boat are analyzed, and the shape of the spray zone of the gliding boat is plotted. The spatter resistance of the taxiboat at different speeds is calculated. At V=0m/s speed, the splash resistance is very small and can be ignored, and the peak value of the splash resistance of the taxiboat in the wave is about 10% of the total resistance ratio under the other speeds. Based on the internal mechanism of the spatter phenomenon of the glider boat and the empirical formula summarized from the relevant tests at home and abroad, the separation method of the splash zone is proposed, and the formulas for calculating the geometric parameters of the spray zone and the splash resistance are derived. Finally, the calculation model and method of splashing parameters and splash resistance of prismatic glider are established, which provides a feasible research and analysis method for the study of splash resistance of gliding 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】：U674.942
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1 凌宏杰;王志东;李鑫;吴娜;;高速滑行艇约束模式下的喷溅阻力特性研究[J];哈尔滨工程大学学报;2013年01期
相关硕士学位论文 前1条
1 李宏伟;数值水池造波方法研究[D];哈尔滨工程大学;2009年
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