高能管道断裂蒸汽喷射过程数值模拟

Numerical simulation of steam injection process during high-energy-pipeline fracture

使用Star-CCM+软件,以完全断裂的高能管道为研究对象,针对3.00~15.00 MPa的饱和蒸汽喷射过程进行了数值模拟研究。主要研究了管道断裂后喷射过程中喷射锥的影响范围、喷射锥内压力和速度分布规律,并针对不同的压力、喷管长径比研究了喷嘴后不同位置处所受的喷射冲击力。研究表明:在喷嘴出口处压力快速下降,蒸汽速度迅速增大,之后会有一定波动;压力升高对喷嘴出口蒸汽最高速度的影响不大,但会影响喷射冲击力的大小;距喷嘴出口处的距离、喷管长径比等也会影响喷射冲击力的大小。

The Star CCM+ software was utilized to simulate the steam injection process, which happened along with high-energy-pipeline fracture. The parameter of saturated-steam was in the range of 3.00-15.00 MPa. This research mainly focused on the influence zone of the jet cone, the distribution of pressure, velocity and temperature in the jet cone, as well as the impingement force that varies with different positions, different steam pressures and different length-to-diameter ratios of the nozzle. The results show that the pressure decreases rapidly at the nozzle outlet, and the steam velocity increases rapidly. Then there will be a certain fluctuation. Although the increase of steam pressure has little effect on the maximum steam velocity at the outlet of nozzle, it affects the injection force. In addition, the distance from the nozzle outlet and the length-to-diameter ratio of the nozzle also affect the value of the impingement force.