20L球形装置上粉尘湍流速度的测量

20L球形装置是用于测试粉尘爆炸特性参数的标准装置之一·粉尘湍流速度对粉尘爆炸猛烈程度和粉尘爆炸特性参数的测试有很大影响·对20L球形装置中的粉尘粒子速度采用激光多普勒测速仪进行了测量研究,并对测量数据进行了分析讨论,通过计算得到了20L球形装置中不同位置粉尘的RMS湍流速度随时间的变化曲线·RMS湍流速度的获得,为最小点火能在不同装置上的测试比较提供了数据,为粉尘爆炸数学模型的检验提供了依据,它还有助于将20L球形装置上测量的数据更好地应用于工业实际·

Measurement of Turbulence Velocity of Dust in a 20L-Sphere

A 20 L-Sphere, as one of the typical measurement set-ups, was used to measure and test the parameters of dust explosion characteristics. In respect to both the characteristic parameters and the violence of dust explosion, the RMS turbulent velocity plays an important role. So, a Laser-Doppler anemometer was applied to the measurement and testing of the velocity of dust particles in a 20 L-Sphere, with all the resulting data processed and discussed. The time-dependent curves of RMS turbulent velocity of dust particles at different positions were therefore obtained, thus providing data for the comparison between minimum ignition energies at different apparatus and also providing a basis for the verification of mathematical models of dust explosion. Such RMS values will benefit applying the data measured to industrial uses.