轴流式通风机轴向间隙与转子内中空区域气体流动特性的研究

发布时间：2018-05-06 14:17

本文选题：对旋式通风机 + 轴向间距　；参考：《山东科技大学》2011年硕士论文

【摘要】：对旋式通风机由于其在安装方便、结构紧凑、反风性能等方面的优点被煤矿广泛采用。然而,近年来该风机却逐渐暴露出噪声高、转子安全性差的缺点。究其原因,主要是因为两级叶排反向旋转,相互间非定常干扰作用强烈。作为轴流式叶轮机械,前后两级叶轮间的轴向间距是影响非定常干扰作用的主要因素,为了给设计高效、低噪、安全、紧凑的风机提供轴向间距的选取依据,本文以一台FBDCZ36型矿用对旋式主通风机为研究对象,通过数值计算分析了额定流量下该风机气动噪声特性、转子安全性和气动性能随轴向间距的变化情况。结果显示：气动噪声特性和转子安全性都随轴向间距增大而改善,但分别在轴向间距达到0.8倍和0.6-0.7倍第一级叶中弦长(b)后,改善趋势放缓,进一步增加轴向间距意义不大；气动性能则在轴向间距为0.55-0.6b时达到最佳,其中,后级转子的进气角和尾迹与主流的掺混是影响气动性能变化的主要因素。研究结果表明,0.7b左右是该风机综合性能较好的轴向间距范围。基于结构强度和节约材料的考虑,大中型轴流式通风机的叶片和轮毂均是中空的,当风机运转后,该区域内的气体由于惯性作用形成轴向涡流,从而与转子内壁面间存在相对移动,由于摩擦作用,该区域内存在一定的能量损失。本文通过对一大型矿用轴流式通风机转子中空区域的非定常流场进行数值计算,分析了该区域内的能量损失及其机理。结果显示,由于空间尺寸限制、湍流脉动以及空气本身的小惯性,该区域内轴向涡流并不明显,气流相对速度值很小,同时空气动力粘度仅有10-5的数量级,该区域的能量损失非常小,而进一步对该区域进行研究或者实施处理的意义不大。
[Abstract]:Counter-rotating fan is widely used in coal mine because of its advantages of convenient installation, compact structure and backwind performance. However, in recent years, the fan gradually exposed the shortcomings of high noise and poor rotor safety. The main reason is that the two-stage blade row rotates in reverse, and the unsteady interference between them is strong. As an axial flow impeller machine, the axial spacing between the front and back impellers is the main factor affecting unsteady disturbance. In order to provide the basis for the selection of axial spacing for the design of high efficiency, low noise, safety and compact fan, In this paper, the aerodynamic noise characteristics, rotor safety and aerodynamic performance of a FBDCZ36 mine counter-rotating main ventilator with rated flow rate are numerically analyzed and analyzed with axial spacing. The results show that the aerodynamic noise characteristics and rotor safety are improved with the increase of axial spacing, but after the axial spacing reaches 0.8 times and 0.6-0.7 times the length of the first stage blade chords respectively, the improvement trend slows down, and the further increase of axial spacing is of little significance. The aerodynamic performance is optimal when the axial spacing is 0.55-0.6b, and the inlet angle and the mixing of the wake with the mainstream are the main factors affecting the aerodynamic performance. The results show that about 0.7b is the range of axial spacing of the fan with better comprehensive performance. Considering the structural strength and material saving, the blades and hub of the large and medium-sized axial flow fan are hollow. When the fan is in operation, the gas in the area forms an axial swirl due to inertia. Therefore, there is a relative movement between the inner surface of the rotor and the inner wall of the rotor, and there is a certain energy loss in the region due to friction. In this paper, the unsteady flow field in the rotor hollow region of a large mine axial flow fan is numerically calculated, and the energy loss and its mechanism in this area are analyzed. The results show that due to the space size limitation, turbulence pulsation and the small inertia of the air itself, the axial eddy current is not obvious in the region, the relative velocity of the air flow is very small, and the aerodynamic viscosity is only in the order of 10-5. The energy loss of the region is very small, but the further research or implementation of the region is of little significance.
【学位授予单位】：山东科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH432.1

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