Hydraulic Characterization and Impeller Optimization Design of Indoor Fire Pumps
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摘要:
为了提高工程实际中的离心式消防泵性能，在原型泵的基础上，优化设计了一种高效、低振且扬程曲线平坦的高性能离心式消防泵. 针对消防泵目前存在的问题，基于计算流体力学方法，采用增加副叶片、改变副叶片长度的措施，设计和比较了3种优化方案. 结果表明：三种优化方案都在一定程度提高了消防泵性能. 优化方案2在设计点的扬程为42.6 m，效率为68.46%，消除了驼峰现象，降低了轴功率，并且提高了效率，综合考虑为最佳方案. 研究结果对工程实际中提升消防泵的性能、降低消防泵轴功率具有指导意义.
Abstract:To improve the performance of the engineering centrifugal fire pump, a high-performance centrifugal fire pump with high efficiency, low vibration and flat head curve was designed and optimized based on the prototype pump. Aimed at the existing problems of the fire pump, with the computational fluid dynamics method, 3 optimization plans were designed and compared through increase of the auxiliary blade and change of the auxiliary blade length. The results show that, all the 3 optimization plans can improve the fire pump performance to some extent. Optimization plan 2 has a lift of 42.6 m at the design point and an efficiency of 68.46%, eliminates the hump phenomenon, reduces the shaft power and improves the pump efficiency, which is synthetically chosen as the best plan. The research results have guiding significance for improving the fire pump performance and reducing the fire pump shaft power.
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Key words:
- fire pump /
- optimized design /
- numerical simulation /
- internal flow characteristic /
- pressure pulsation
edited-byedited-by1) (我刊青年编委胡箫来稿) -
图 3 改进方案中部分尺寸标注
Figure 3. The partial dimension annotation diagram in the improvement plan
图 7 原方案和优化方案静压分布云图对比
注 为了解释图中的颜色，读者可以参考本文的电子网页版本，后同.
Figure 7. Comparison of static pressure distribution nephograms between the original plan and the optimized plan
图 8 原方案和优化方案流线分布云图对比
Figure 8. Comparison of streamline distribution nephograms between the original plan and the optimized plan
图 9 原方案和优化方案涡核分布云图对比
Figure 9. Comparison of vortex core distribution nephograms between the original plan and the optimized plan
图 10 各工况隔舌处压力脉动图
Figure 10. The pressure pulsation diagram at the tongue under each working condition
表 1 叶轮的主要几何参数
Table 1. The main geometric parameters of the impeller
geometric parameter symbol/unit value inlet diameter D1/mm 72 outlet diameter D2/mm 183 outlet width b2/mm 20.6 cornerite θ/(°) 86 number of blades Z 6 
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表 2 消防泵网格无关性验证
Table 2. The fire pump grid independence verification
plan number of grids in the impeller region efficiency/% plan 1 258 655 64.37 plan 2 315 427 63.42 plan 3 381 057 63.15 plan 4 459 103 62.64 plan 5 545 728 62.48
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