直壁滑道式滑行艇阻力性能數(shù)值模擬分析
發(fā)布時間：2018-08-12 19:51
【摘要】：滑行艇是依靠航行時艇體產(chǎn)生的流體動壓力支托大部分艇體重量的高速艇,外形較排水型艇短而寬,底部較平坦。若底和舷交接處呈尖角,形成尖舭,亦叫尖舭艇。目前,對于滑行艇的水動力性能預報相對復雜,常用船模試驗方法。但是船模試驗由于模型小、航速高、試驗條件較為苛刻局限性強。用數(shù)值模擬方法,能科學模擬計算高速艇航行情況,經(jīng)濟投入小、重復性好、克服了船模試驗的某些局限性。隨著計算流體力學CFD的發(fā)展和完善,利用數(shù)值仿真對船舶阻力進行分析和預報備受青睞。本文對美國62系列滑行艇的艇體線型及相關(guān)阻力性能作了分析,在此基礎(chǔ)上,選取長寬比為4.09的4667-1號滑行艇船模試驗模型為研究對象,利用Gambit軟件對船型進行型線建模,并基于CFD仿真理論,利用Finemarine仿真軟件對建立的4667-1號滑行艇模型進行在不同航速下的數(shù)值仿真,將仿真結(jié)果與該模型的船模試驗阻力值進行比較,用以驗證該方法的可靠性,說明計算域的選擇、網(wǎng)格的劃分和計算參數(shù)的設(shè)置適合該艇型的數(shù)值仿真。后以該船型為母型船,派生出新的船型,直壁滑道式及普通雙體滑行艇。然后應(yīng)用同樣的方法對派生出的直壁滑道式及普通雙體型滑行艇模型進行阻力數(shù)值仿真,得到各個模型在不同工況下的仿真結(jié)果。為了更清楚的看出各個船型之間阻力仿真的區(qū)別,本文設(shè)置了各個模型之間的對比,更清楚的分析了各船型仿真結(jié)果以及阻力性能差別的原因。通過對4667-1模型的阻力仿真值對比試驗值,驗證了此方法的可靠性較高,誤差小。并對62系列滑行艇模型和直壁滑道式滑行艇及普通滑行艇的總阻力仿真結(jié)果進行了對比分析,通過對不同模型阻力仿真結(jié)果對比得到直壁滑道式滑行艇在航速較高時通過連接體獲得艇體內(nèi)側(cè)興波和飛沫及空氣形成的高速流給于的升力從而減小阻力效果明顯,并且改變滑道的高度會對直壁滑道式滑行艇的阻力性能產(chǎn)生影響。最后根據(jù)傅汝德假定,得到直壁滑道式滑行艇每種工況下的剩余阻力系數(shù),為直壁滑道式滑行艇的阻力估算提供較為快捷的途徑。
[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.
【學位授予單位】：江蘇科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U661.311
，
本文編號：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.
【學位授予單位】：江蘇科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U661.311
，
本文編號：2180177
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