关键词: 静电传感器 , 气／固两相流 , 互相关原理 , 流速 , 屏蔽 , 精度

Abstract: The probe shielding design provides a guarantee to measured signals, and this increases the similarity degree of the two measurement signals during the electrostatic sensor design. Meanwhile the choice of PVC tube can also effectively increase the sensitivity of the probe. The question of electrostatic shielding was focused on, and improving the shielding effect is to increase the similarity of the two measurement signals and improve velocity precision. With the shielding experiments it can explain the shielding design is very important to the probe making, and it obtains better measuring results. In the experiments the principle of cross-correlation noise immunity are probed, and the flow velocity was measured with same high at different radial position. Under the guidance of the cross-correlation theory, electrostatic theory and experiment, the experimental device has good repeatability and high measurement accuracy, and repeatability error is in ±2%. Within 2~7 m/s the flow velocity measuring experiment is done, and measurement results of the repeatability error are less than ±2%.

Key words: Electrostatic sensor,    ,  Gas-solid two phase flow, Cross correlation principle,    ,  Flow velocity,   , Shielded,   ,  Accuracy