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用于间接加热的气体燃烧器,在距火焰捕集器3ft处测得的噪音都会高于85～88dBA。这与喷嘴及火管中气体的速度有关。一系列的试验结果表明:只有当喷嘴中气体的速度远远大于火管中气体的速度时,一般设计中出现的低频率的“隆隆”声才会消失。试验数据还表明燃烧器的噪音与气体的体积膨胀率、燃烧器中空气与燃料的比率、混合气体的流速、孔口气体的速度、燃烧室的面积以及燃烧室的数量有关。只要计算出这些变量,便可预测出燃烧器的噪音大小。
For indirect heating of gas burners, the noise measured at 3ft from the flame trap will be higher than 85 ~ 88dBA. This is related to the velocity of the gas in the nozzle and the tube. A series of experimental results show that the low frequency “rumbling” sound of the general design disappears only when the gas in the nozzle is much faster than the gas in the tube. The experimental data also shows that the burner noise is related to the volumetric expansion of the gas, the ratio of air to fuel in the burner, the flow rate of the mixed gas, the velocity of the orifice gas, the area of the combustion chamber, and the number of combustion chambers. As long as these variables are calculated, the burner’s noise level can be predicted.