摘要
管道压力是进行泄漏速率计算和泄漏后果模拟的重要参数,采取试验与数值模拟相结合的方法对小孔泄漏压力响应进行研究。以中国石油大学(华东)泄漏及气体扩散测试试验系统为平台,建立了试验系统的Flowmaster模型,并通过试验数据对模型进行验证。结果表明,试验系统可以用来研究小孔泄漏管道内的压力响应情况并准确计量泄漏速率,可以基于Flowmaster模型预测复杂工况下小孔泄漏管道内的压力响应情况,并且能够较为精确地计算泄漏稳定后管道内的平均压力。
This paper is aimed at presenting the results of our experi- mental and simulated study on the pressure response in the hole-leak process. For our research purpose, we have adopted the hole-leaking model for calculating the hole-leak permeating or flowing rate. Gener- ally speaking, it is assumed that the hole-leaking takes place due to the constant pipeline pressure as is believed in the hole-leaking mod- el. But, we have noticed that the pipeline pressure varies from time to time in the hole-leaking process. As a result, the actual leaking rate has been affected, which would make the consequential analysis based on the above said model unconvincing. Seeing the above facts, we think it significant to study the regularities of pipeline pressure and work out the actually working pressure as precisely as possible. In proceeding with our experiments and simulations with the leak and gas diffusion testing practice in China University of Petroleum, we have chosen the hole-diameter reasonably and verified the accuracy of the measuring tools to accomplish our hole-leak experiments under differ- ent pressures. By means of the fluid analysis software named Flow- master, we have established a numerical model of experimental sys- tem. We have also carefully tested and measured the data and results with the hole-leaking conditions by changing parameters of some com- ponents. And, finally, the experimental and numerical simulation re- suits show that the pipeline pressure keeps dropping during the hole- leaking process, which goes from one stable state to another. In such a situation and at this level, the hole-leaking process continues. In addition, we have also proved the Flowmaster model by selecting the experimental data of 1 mm and 1.5 mm hole-diameter as the initial conditions and boundary conditions. Through the contrasting analysis of the simulation results with the experimental data, we have suc- ceeded in fulfilling the approximate description of the tendency of the pressure changes and finding the calculation errors of stable pressure being 0.3% and 0.06%, respectively. Thus, it can be seen that the model can be used to forecast the pressure response of the hole-leak- ing and work out the stable pressure of the pipeline involved more ac- curately. In addition, it also indicates that the pressure response of hole-leaking from the gas pipeline can be worked out by combining the experimental simulation.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2014年第1期47-50,共4页
Journal of Safety and Environment
基金
中央高校基本科研业务费专项资金项目(10CX01002A
11CX04037A)
中国石油天然气集团公司科学研究与技术开发项目(2011D-4603-0104)
