The results clearly document that the curves of vertical and main velocity in the middle area of the volute are parabolic at all running speeds.
结果表明，蜗室中间的主流速度在不同转速下均呈抛物线型分布；
2
Results show that the gas flow velocity along the thickness direction is regularly distributed in a parabolic curve and the maximum velocity is in the center of the slot.
结果表明，其速度沿狭缝厚度方向按抛物线规律分布，狭缝中心速度最高，流动状态一般为层流；
3
Velocity distribution can be expressed by a logarithmic formula for the inner zone and a parabolic formula for outer and surface zones.