水下采油树阻力系数试验与数值模拟

Experiment and Numerical Simulation of Drag Coefficient of Subsea Tree

为了给来流条件下采油树水动力荷载计算提供基础数据,建立水下采油树数值模型。基于有限体积法,采用商业软件STAR-CCM+,对采油树模型拖曳试验进行数值模拟,计算得到13种拖曳速度条件下采油树纵向、横向和垂向的阻力及阻力系数,并在此基础上提出一种新的水下采油树模型拖曳试验方法,开展了39组拖曳试验,得到13种速度条件下采油树纵向、横向和垂向的阻力及阻力系数。结果表明:阻力和阻力系数的试验数据与数值仿真数据基本保持一致,验证了结果的准确性和可靠性;水下采油树模型各方向阻力随拖曳速度的增加呈二次关系增加,阻力系数随速度的增加基本保持稳定;纵向、横向和垂向的阻力系数平均值约为0.432、0.479和0.446。数值模拟和试验得到的采油树阻力和阻力系数可为采油树水动力荷载计算提供关键基础数据。

For the subsea tree under the flow,the subsea tree numerical model is established to provide the basis data for calculating hydrodynamic load.Based on the finite volume method and the commercial software STAR-CCM+,the towing test of model is simulated.13 groups of drag force and drag coefficient of model are obtained under different velocity of longitudinal,transverse and vertical direction.On this basis,a new towing test method of subsea tree model is proposed.39 groups of towing tests are carried out,and the longitudinal,transverse and vertical drag force and drag coefficient of subsea tree under 13 speeds are obtained.The results show that the experimental data of drag force and drag coefficient are basically consistent with the numerical data,which verifies the accuracy and reliability of the data.The drag force of each direction of the subsea tree model increased in a quadratic relationship with the increase of the velocity,and the drag coefficient is basically stable with the increase of the velocity.The average drag coefficients in longitudinal,transverse and vertical directions are about 0.432,0.479 and 0.446.The drag force and drag coefficient obtained from the numerical simulation and experiment in this paper could provide key basic data for the calculation of subsea tree hydrodynamic load.