海底管道立管局部冲刷数值模拟

详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文

英文篇名：Numerical simulation of local erosion in riser of subsea pipeline 中文刊名：油气储运 英文刊名：Oil & Gas Storage and Transportation 作者：刘延鑫 ; 王旱祥 ; 张延军 ; 耿旭占 英文作者：Liu Yanxin 1 ; Wang Hanxiang 1 ; Zhang Yanjun 2 ; Geng Xuzhan 3 1. College of Electromechanical Engineering ; China University of Petroleum ; Qingdao ; Shandong ; 266580 ; 2. PetroChina Liaohe Equipment Company ; Panjin ; Liaoning ; 124010 ; 3. CNOOC Supervision and Technology Branch ; Tianjin ; 300452 中文关键词：海底管道 ; 立管 ; 数学模型 ; 局部冲刷 ; 冲刷机理 英文关键词：subsea pipeline ; riser ; mathematical model ; local erosion ; erosion mechanism 出版日期：2013-04-25 机构：中国石油大学(华东)机电工程学院;渤海装备辽河重工有限公司;中海油监督监理技术分公司; 年：2013 期：07 出版单位：油气储运

摘要

基于κ-ε湍流模型,建立了海底管道立管与海洋平台桩腿相连接、海流流经海洋平台桩腿发生绕流现象的三维流场模型,模拟了冲刷过程中不同条件下立管附近流场及压力的变化,研究了海底管道立管局部冲刷机理。模拟结果表明:随着与立管连接的横管悬空量增大,立轴漩涡越来越密集,海底管道局部冲刷速度加快;在一定范围内,随着桩腿与立管间距的增大,冲刷速度加快,但是当该间距增大到一定程度时,冲刷速度逐渐减慢;增大桩腿的直径,可以减少海流携带泥沙量,冲刷作用得以减缓。
On the bases of κ-ε turbulent flow model, it is possible to construct 3D flow-field model to reflect circumferential flows of sea currents around spud legs of offshore platform with riser of subsea pipeline connected with spud legs of offshore platform. By using the model, it is possible to simulate the changes of flow fields and pressures around riser under different conditions during erosion. In addition, the mechanism related to local erosion of riser in subsea pipeline is studied. Research results show that the vertical axial vortex is more and more intensive with the increase of the suspended length of horizontal pipe connected with riser. In addition, local erosion of subsea pipeline is accelerated under such circumstances. Within certain scope, erosion velocity is increased with the increase of the space between spud legs and riser. But as soon as the space is increased to a certain limit, erosion velocity is decelerated. By enlarging the diameters of spud legs, it is possible to reduce the washing volume carried by sea currents, and eventually alleviate erosion.

引文

[1]周晶,李昕,马恒春,等.地震时海底悬跨管道动力特性试验研究[J].水利学报,2003,34(1):12-16.
    [2]李昕,刘玉坤,周晶,等.海底悬跨管道动力响应的试验研究和数值模拟[J].工程力学,2003,20(2):21-25.
    [3]杨兵,高福平,吴应湘,等.海流引起海底管道悬空的数值模拟[J].中国造船,2005,46(z1):221-226.
    [4]Li F,Cheng L.A numerical model for local scour under offshore pipelines[J].Journal of Hydraulic Engineering,1999,125(4):400-406.
    [5]仲华.某气田群海底管道的冲刷机理[J].油气储运,2011,3(05):376-380.
    [6]刘盈溢,吕林,郑苗子,等.波流作用下海床稳定性和海底管道局部冲刷分析[J].浙江大学学报(工学版),2012,46(6):1135-1142.
    [7]吴钰骅,金伟良,毛根海,等.海底输油管道底砂床冲刷机理研究[J].海洋工程,2006,24(4):42-48.
    [8]Mao Y.Seabed scour under pipelines[C].Proceedings of7th International Symposium on Offshore Mechanics and Arctic Engineering,Houston,USA,February7-12,1988.
    [9]Sumer B M.Onset of scour below pipelines and self-burial[J].Coastal Engineering,2001,42(4):313-335.
    [10]Sumer B M,Jensen H R,Ye Mao.Effect of lee-wake on scour below pipelines in current[J].Journal of Waterway,Port,Coastal and Ocean Engineering,1988,114(5):599-614.
    [11]文君锋,勾莹,宋伟华,等.海流作用下海底管道局部冲刷数值分析[J].海洋工程,2012,30(1):75-82.
    [12]Roulund A.Three-dimensional numerical modeling of flow around a bottom-mounted pile and its application to scour[D].Copenhagen:Technical University of Denmark,2000.
    [13]陈兵,邵学,韩丽华,等.海洋立管的局部冲刷实验[J].沈阳工业大学学报,2009,31(6):712-720.
    [14]林建忠,阮晓东,陈邦国,等.流体力学[M].北京:清华大学出版社,2005:316-326.
    [15]吴望一.流体力学[M].北京:北京大学出版社,2008:345-386.