便携式风力灭火机的数值优化设计

为了进一步提高现有便携式风力灭火机效率，该文对某6MF-30型风力灭火机进行了优化设计。首先通过试验及数值模拟分析了原机效率偏低的原因，然后应用最优化理论，以风力灭火机效率为目标建立数学模型，使用C++软件编程计算得到设计变量的优化组合；以此为基础建立风力灭火机的三维模型，对影响其性能的因素进行分析，并采用商用CFD软件FLUENT对改进前后的风力灭火机流场进行了计算；优化后的风力灭火机其出口全压、流量、效率分别较原机提高了8.95%、5.30%和11.53%。该文所采用的方法可为风力灭火机的设计提供参考。

Numerical optimum design of portable pneumatic extinguisher

In order to improve the efficiency of portable pneumatic extinguisher, the 6MF-30 type extinguisher was test and optimized. The efficiency of the extinguisher was taken as the objective parameter for optimum design and optimal variables combination was got using C++ programming. A three-dimensional model was constructed based on the objective optimal structural variables and the influence factors of the extinguisher performance were analyzed by using FLUENT of CFD software. The results showed that the total pressure at outlet, the volume flow rate and the efficiency of the optimized extinguisher increased by 8.95%, 5.30% and 11.53% respectively. The method proposed can provide a reference for the design of extinguishers.