消防管道弯管接头过流反作用力特性研究

Study on Reaction Force Characteristics of Bent Joints of Fire Pipelines

摘要: 消防车上的弯管接头结构复杂导致射流特性难以被准确掌握。本文首先采用理论计算对仿真模型进行验证，随后采用仿真手段研究了不同弯管转角、不同进口流量、不同出进口面积比与弯管接头过流时在两个方向上的喷射反力的关系，并得到了最后的相关拟合公式。结果表明：在两个方向上的喷射反力的理论计算值与仿真值一致性较好，验证了仿真模型的正确性，此外还得到了弯管转角与两个方向的喷射反力呈现相反的线性关系，而进口流量与两个方向上的喷射反力均呈现正线性相关的关系，出进口面积比与两个方向上的喷射反力的关系较复杂，呈现出多项式的负相关的关系。这为后续类似弯管接头的设计提供了理论支撑。

Abstract: The complex structure of elbow joints on fire trucks makes it difficult to accurately grasp the characteristics of jet flow. In this paper, theoretical calculation is used to verify the simulation model. Simulation methods are conducted to study the relationship between elbow angles, inlet flow, inlet area ratio and the spray reaction in two directions, and the final correlation fitting formula is obtained. The results of this paper show that the theoretical calculated values of the jet reaction in both directions are in good agreement with the simulated values, which verifies the correctness of the simulation model. In addition, it is also obtained that the bend angle of the pipe has an opposite linear relationship with the jet reaction in both directions, while the inlet flow rate has a positive linear relationship with the jet reaction in both directions. The relationship between the area ratio of outlet and inlet and the jet reaction in both directions is complex, showing a polynomial negative correlation. This provides theoretical support for the subsequent design of similar elbow joints.