CAJ | 학술논문

球形内检测器能准确地检测和定位海底管道微小泄漏，为实现其对微小泄漏的检测和定位，必须保证球形内检测器顺利通过海底管道立管段。应用标准k-ε双方程模型和流体计算软件Fluent 14.0，对实验平台立管道内模型球周围流场进行三维数值仿真，并计算模型球通过立管段的临界速度。该速度与实验数据很好吻合，验证了仿真方法的正确性。基于此仿真方法，预测球形内检测器在实际海底管道立管段内的通过性并分析其通过性影响因素。得出结论：球管径比（球体直径与管道直径的比值）是一个很重要的参数，球管径比大于等于73%时，球形内检测器在流速为0.8~1.2 m/s的正常工况下能顺利通过海底管道立管段。
구형내검측기능준학지검측화정위해저관도미소설루，위실현기대미소설루적검측화정위，필수보증구형내검측기순리통과해저관도립관단。응용표준k-ε쌍방정모형화류체계산연건Fluent 14.0，대실험평태립관도내모형구주위류장진행삼유수치방진，병계산모형구통과립관단적림계속도。해속도여실험수거흔호문합，험증료방진방법적정학성。기우차방진방법，예측구형내검측기재실제해저관도립관단내적통과성병분석기통과성영향인소。득출결론：구관경비（구체직경여관도직경적비치）시일개흔중요적삼수，구관경비대우등우73%시，구형내검측기재류속위0.8~1.2 m/s적정상공황하능순리통과해저관도립관단。
Spherical pipeline’s inner detector can test and locate subtle leakage in a submarine pipeline. In order to estab-lish a more accurate result, the spherical inner detector must go through the submarine pipe’s vertical segment smoothly. Using standard k-ε double-equation model and computational fluid dynamics software Fluent, a three-dimensional simu-lation about the model ball’s flow field is established on the basis of experimental vertical pipe platform. Also, the critical speed when the ball is passing through the vertical segment is calculated. The outcome speed matches well with experi-mental data, proving the simulation method correct. On the strength of this simulation, the possibility of whether a detec-tor can pass real submarine pipeline or not is predicted, and the influencing factors are analyzed. A conclusion is achieved that the diameter ratio between the ball and the pipe is a significant parameter, which guarantees the spherical inner detec-tor passing the submarine pipe’s vertical segment without barrier under a normal working condition of flow speed 0.8~1.2 m/s , when it is lager than 73 percent.