三維滑行艇模型流體動力.doc
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三維滑行艇模型流體動力,摘要隨著對于高速海上交通工具的需求的增長，出現(xiàn)了很多先進的船體型式的設計?；型Щ羞^程中能夠產生動升力，而且能有效減小興波阻力,在同樣的主機功率下能夠得到很高的速度。相比于普通船型，具有顯著優(yōu)勢?；型У乃畡恿π阅芘c安全性緊密相關，由于滑行艇在航行時常處于不同的滑行狀態(tài),阻力成分及各成分的比例變化復雜，使滑行艇水動力...
內容介紹
此文檔由會員 違規(guī)屏蔽12 發(fā)布
摘要
隨著對于高速海上交通工具的需求的增長，出現(xiàn)了很多先進的船體型式的設計?；型Щ羞^程中能夠產生動升力，而且能有效減小興波阻力,在同樣的主機功率下能夠得到很高的速度。相比于普通船型，具有顯著優(yōu)勢?；型У乃畡恿π阅芘c安全性緊密相關，由于滑行艇在航行時常處于不同的滑行狀態(tài),阻力成分及各成分的比例變化復雜，使滑行艇水動力性能的研究遠較常規(guī)排水船困難,目前尚有大量未解決的問題。
應用計算流體力學軟件Fluent探討不同攻角、不同體積傅汝得數(shù)下的三維滑行艇靜水直航水動力特性及流場分布，并與經驗公式估算值相比較，分析滑行艇的水動力性能變化情況。通過簡化的數(shù)值模型與計算控制程序相結合，數(shù)值模擬滑行艇的升沉縱搖耦合運動，進行不同航行階段：排水航行階段、過渡階段和滑行階段下的滑行艇運動響應比較分析，探討滑行艇從初始狀態(tài)開始航行過程中的姿態(tài)調整，包括艇體重心位置的變化及航行中縱搖角的變化量，并將計算結果與固定姿態(tài)計算結果進行比較分析。以斜航試驗為基礎，建立不同漂角下計算模型并運用流體力學軟件Fluent展開了滑行艇在滑行狀態(tài)下的數(shù)值模擬，包括計入風載荷作用工況，對不同漂角三維滑行艇模型在滑行狀態(tài)下的阻力性能進行比較分析。對數(shù)值結果進行計算處理，得到水動力系數(shù)測定曲線，為滑行艇水動力系數(shù)的數(shù)值測定提供了一種擺脫實驗條件限制的參考方法。對滑行艇水動力性能研究由一定的實際意義和參考價值。
目前，對于滑行艇的水動力性能研究還是個較困難的問題，通常都是船模試驗來解決。但是滑行艇的操縱性試驗由于模型小、航速高，試驗條件較為苛刻，這部分研究并不夠充分。通過CFD方法研究，能科學的模擬計算其航行情況，克服了試驗的局限性，而且，在研究中將空氣和水結合起來考慮，更符合實際情況，對進一步深入研究滑行艇水動力性能有重要意義。隨著數(shù)值模擬技術的發(fā)展，用數(shù)值方法模擬滑行艇的運動狀況來研究其運動性能，將成為具有重要意義的解決方案。本文的研究內容和方法為滑行艇水動力性能研究提供了可靠的數(shù)值計算模型，提出了一些經驗及建議，為今后的研究起到鋪墊作用。
關鍵詞：三維滑行艇；水動力特性；運動響應；不同攻角；不同漂角；數(shù)值模擬
Abstract
Lots of advanced designs of hull form appear as the demand for high-speed marine vehicles increases. The planning ship can produce dynamic lift force during the planning process which can effectively reduce the wave making resistance and get higher speed under the same power of main motor. The planning ship has remarkable advantage in comparison with other hull forms. Hydrodynamic performance are closely interconnected with the safety of planning ship. The change of components of resistance force and the relative size of each item included in total is complex because of the planning ship is always in different movement state, so the research of hydrodynamic characteristics is much more difficult than other regular displacement type vessel, and there are still lots of problems unsolved.
This research focuses on the application of numerical simulation method which is used to study the changes of hydrodynamic force of 3D planning ship. Hydrodynamic performance of 3D planing ship was numerically simulated using computational fluid dynamics software FLUENT. Hydrodynamic characteristics of 3D planing ship model at two different attack angles and different Froude numbers were calculated. Results were compared with theoretical eva luation results and show good agreement. The surrounding flow field of planing ship during the motions was numerically simulated. By combining the simplified numerical model and computational control program, the heave-pitch coupled motion of planing ship was numerically simulated. Motion response of planing ship under different movement states was compared and analyzed. Curves of centre-of-gravity position and pitch angle were given in the paper and numerical results were compared with results of planing ship moving with fixed attitude. Based on loxodromic towing test, computational models of different drift angles were established and numerical simulation was carried out using Fluent. Resistance performance of planing ship under different drift angles were compared and analyzed. Curves about testing the hydrodynamic coefficients were presented. The study supplied a reference approach for hydrodynamic coefficient test which could get rid of the limit of experiment condition and had great significance in the research of hydrodynamic performance of planing ship.
At present, research on hydrodynamic performance of planing ship still has many unsolved problems which are always sloved by ship model test. Maneuvering test on planing ship is limited by experimental conditions because of the high speed of planing ship. Research in this field is not enough. So by the use of computational fluid dynamics, motions of planing ship can be scientifically simulated and calculated., Results are in accordance with the practice by combining air and water in the study. The method used in this paper has great significance for further study of hydrodynamic performance of planing ship. With the development of numerical simulation technology, the numerical simulation method will be more and more used in the research about motions of planing ship. This paper investigates applications of numerical simulat..
隨著對于高速海上交通工具的需求的增長，出現(xiàn)了很多先進的船體型式的設計?；型Щ羞^程中能夠產生動升力，而且能有效減小興波阻力,在同樣的主機功率下能夠得到很高的速度。相比于普通船型，具有顯著優(yōu)勢?；型У乃畡恿π阅芘c安全性緊密相關，由于滑行艇在航行時常處于不同的滑行狀態(tài),阻力成分及各成分的比例變化復雜，使滑行艇水動力性能的研究遠較常規(guī)排水船困難,目前尚有大量未解決的問題。
應用計算流體力學軟件Fluent探討不同攻角、不同體積傅汝得數(shù)下的三維滑行艇靜水直航水動力特性及流場分布，并與經驗公式估算值相比較，分析滑行艇的水動力性能變化情況。通過簡化的數(shù)值模型與計算控制程序相結合，數(shù)值模擬滑行艇的升沉縱搖耦合運動，進行不同航行階段：排水航行階段、過渡階段和滑行階段下的滑行艇運動響應比較分析，探討滑行艇從初始狀態(tài)開始航行過程中的姿態(tài)調整，包括艇體重心位置的變化及航行中縱搖角的變化量，并將計算結果與固定姿態(tài)計算結果進行比較分析。以斜航試驗為基礎，建立不同漂角下計算模型并運用流體力學軟件Fluent展開了滑行艇在滑行狀態(tài)下的數(shù)值模擬，包括計入風載荷作用工況，對不同漂角三維滑行艇模型在滑行狀態(tài)下的阻力性能進行比較分析。對數(shù)值結果進行計算處理，得到水動力系數(shù)測定曲線，為滑行艇水動力系數(shù)的數(shù)值測定提供了一種擺脫實驗條件限制的參考方法。對滑行艇水動力性能研究由一定的實際意義和參考價值。
目前，對于滑行艇的水動力性能研究還是個較困難的問題，通常都是船模試驗來解決。但是滑行艇的操縱性試驗由于模型小、航速高，試驗條件較為苛刻，這部分研究并不夠充分。通過CFD方法研究，能科學的模擬計算其航行情況，克服了試驗的局限性，而且，在研究中將空氣和水結合起來考慮，更符合實際情況，對進一步深入研究滑行艇水動力性能有重要意義。隨著數(shù)值模擬技術的發(fā)展，用數(shù)值方法模擬滑行艇的運動狀況來研究其運動性能，將成為具有重要意義的解決方案。本文的研究內容和方法為滑行艇水動力性能研究提供了可靠的數(shù)值計算模型，提出了一些經驗及建議，為今后的研究起到鋪墊作用。
關鍵詞：三維滑行艇；水動力特性；運動響應；不同攻角；不同漂角；數(shù)值模擬
Abstract
Lots of advanced designs of hull form appear as the demand for high-speed marine vehicles increases. The planning ship can produce dynamic lift force during the planning process which can effectively reduce the wave making resistance and get higher speed under the same power of main motor. The planning ship has remarkable advantage in comparison with other hull forms. Hydrodynamic performance are closely interconnected with the safety of planning ship. The change of components of resistance force and the relative size of each item included in total is complex because of the planning ship is always in different movement state, so the research of hydrodynamic characteristics is much more difficult than other regular displacement type vessel, and there are still lots of problems unsolved.
This research focuses on the application of numerical simulation method which is used to study the changes of hydrodynamic force of 3D planning ship. Hydrodynamic performance of 3D planing ship was numerically simulated using computational fluid dynamics software FLUENT. Hydrodynamic characteristics of 3D planing ship model at two different attack angles and different Froude numbers were calculated. Results were compared with theoretical eva luation results and show good agreement. The surrounding flow field of planing ship during the motions was numerically simulated. By combining the simplified numerical model and computational control program, the heave-pitch coupled motion of planing ship was numerically simulated. Motion response of planing ship under different movement states was compared and analyzed. Curves of centre-of-gravity position and pitch angle were given in the paper and numerical results were compared with results of planing ship moving with fixed attitude. Based on loxodromic towing test, computational models of different drift angles were established and numerical simulation was carried out using Fluent. Resistance performance of planing ship under different drift angles were compared and analyzed. Curves about testing the hydrodynamic coefficients were presented. The study supplied a reference approach for hydrodynamic coefficient test which could get rid of the limit of experiment condition and had great significance in the research of hydrodynamic performance of planing ship.
At present, research on hydrodynamic performance of planing ship still has many unsolved problems which are always sloved by ship model test. Maneuvering test on planing ship is limited by experimental conditions because of the high speed of planing ship. Research in this field is not enough. So by the use of computational fluid dynamics, motions of planing ship can be scientifically simulated and calculated., Results are in accordance with the practice by combining air and water in the study. The method used in this paper has great significance for further study of hydrodynamic performance of planing ship. With the development of numerical simulation technology, the numerical simulation method will be more and more used in the research about motions of planing ship. This paper investigates applications of numerical simulat..
