And then different average velocity formulas of debris flows were studied , they all accord with the manning ' s formula . these corrected formulas are very accurate 对比了泥石流平均流速的各种公式,共同特点满足曼宁公式,修正后的公式精度较高。
Up to now , the current velocity measurement methods can only generally be used to determine the average velocity of a moving object between two points 目前速度的测试方法一般仅能确定运动物体在两点间的平均速度,瞬时速度的连续测试方法在国内尚未得到足够的开发和应用。
Meanwhile , we adopted air distribution performance index , temperature gradients and average velocity to evaluate and compare room air distribution under various air volumes 同时,用空气分布性能指标、温度梯度以及室内平均速度对不同送风量下的室内气流分布进行了评价和比较。
Secondly , the relation between nusselt number and the local time - averaged velocity and temperature fields of turbulent convection was theoretically induced , which expands the field - coordinated enhancement principle to turbulent convective heat transfer 然后,在理论上导出了紊流对流换热的整体换热性能与局域时均速度场和时均温度场的一般关系式,将对流换热的场协同强化原则扩展至湍流换热。
The turbulent flow in open channel is tested with laser - doppler anemometer , in which the longitudinal time average velocity and fluctuating velocity of turbulent flow in open channel under the conditions of the sudden changes of roughnesses at different water depths are measured 摘要通过激光测速仪,对壁面糙率突变时的明渠紊流进行试验,测量了糙率突变不同水深情况下明渠紊流的纵向时均流速和脉动流速。