化工学报2001，Vol.52Issue(2)：153-157,5.
射流撞击过程中的高频压力脉动特性
CHARACTERISTICS OF DYNAMIC PRESSURE IN IMPINGING JET
王亭杰 1肖帅刚 1崔爱莉 1林玉兰 1金涌1
作者信息
摘要
Abstract
The characteristics of dynamic pressure in an impinging jet wereexperimentally studied. The instantaneous signals of dynamic pressure resulted from the turbulence in the jetting fluid were measured through a piezoelectric sensor and recorded by a computer. The pressure signals at central axial position of the jetting fluid were sampled at different fluid pressure. The measured signals obviously possessed periodical characteristics. After analyzing the signals with FFT method,it was found that there was an inherent frequency in the dynamic pressure signals. The inherent frequency increases with the average velocity of the jetting fluid at the nozzle outlet,which is consistent with the theoretical analysis. It was supposed that the dynamic pressure signals are transformed from the fluctuating fluid velocities resulted from the turbulence in the jetting fluid. The inherent frequency corresponds to the minimum eddy scale in the turbulent jet. The smaller the eddy scale is,the higher the inherent frequency is. Higher velocity of the fluid at the outlet leads to a stronger turbulent strength. The fluctuation velocities with high inherent frequency resulted in a strong shear force field,which enables the fluid to be micro-mixed fleetly and the agglomerate of solid particles to be dispersed effectively.关键词
撞击流/压力脉动/射流/分散/湍动分类
化学化工引用本文复制引用
王亭杰,肖帅刚,崔爱莉,林玉兰,金涌..射流撞击过程中的高频压力脉动特性[J].化工学报,2001,52(2):153-157,5.
