There is an inner boundary within the rotational flow field of hydrocyclone.
旋流器内的旋转流场中存在一内边界，其速度头为零；
In laser Doppler velocimeter application to rotational flow, the window effect will appear when measurement window rotates with the flow field.
在应用激光多普勒测速仪测量旋转流场时，如果测量窗口随着旋转流场一起转动，就会产生窗口效应问题。
The rotational jet and local oxygen enrichment can improve the mixing of oxygen and pulverized coal, but the effect of coal injection is weak on the whole flow field in blowpipe.
结果表明，氧-煤喷枪的漩流、富氧率等仅在氧枪出口的有限区域内对流场有较大的影响；
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