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局扇的工作风量、风压及效率的高低,是评定其通风性能的主要技术指标。测定出的局扇性能曲线与实际是否相符,关键在于这两个参数的准确程度。测定的准确度除与测试条件、测试手段、仪器仪表的精度以及测试人员的技术素质有关外,很大程度上取决于测场位置、测点的布置方式。我们对平局煤机厂玻璃钢消音器,五矿、七矿、八矿部分局扇以及高效局扇、塑料质局扇、对旋式消音局部扇风机进行技术性能测试,取得一些经验,现将体会简单介绍如下:1 测点位置设置优化 局部扇风机叶片的快速运转,迫使风流冲出风机之后呈一螺旋状高速流动,形成不均匀的流动场,加上风筒的局部阻力,风流流场始终呈不规则的抛物面移动,其风流的不稳定性随通风距离的增长而减小。风流稳定性变化曲
Bureau fan working air volume, wind pressure and the level of efficiency is to assess the ventilation performance of the main technical indicators. The determination of the local fan performance curve and the actual match, the key lies in the accuracy of these two parameters. In addition to the determination of accuracy and test conditions, test methods, instrumentation, precision and testers of the technical quality, largely depends on the location of the test site, measuring point arrangement. We have some experience in the technical performance test of the Pingju Coal Mill FRP muffler, the Minmetals, the Seventh Mine and the eight ore mines, as well as the technical performance test of the Fan with fan, plastic quality fan and counter-rotating muffler fan A brief introduction is as follows: 1 measuring point position set to optimize the rapid operation of local fan blades, forcing the wind out of the fan was a spiral high-speed flow, the formation of an uneven flow field, coupled with the local resistance of the wind tube, the flow is always Irregular paraboloid movement, the wind flow instability decreases with the increase of ventilation distance. Wind flow stability curve