| 摘要 |
FIELD: physics; measuring. ^ SUBSTANCE: invention concerns water-power engineering field, namely to methods of determination of rates of flux of a fluid in pipelines of major diameters of hydroelectric power stations at Reynolds numbers Re>>1x106. The first method lies in determination of local quantities of velocities of a stream on radiuses of traversal section of the pipeline. Break traversal section of the pipeline into 3-8 ring segments of equal volumes at their warrants. Then spot areas of their foundation beds and calculate co-ordinate x0 of points of measuring concerning centre of section of the pipeline on the basis of the Nikuradze power law In points x0 erect hydrometric revolving objects, measure medial velocity of a stream in each segment and count the full rate of flux. According to the second method, radiate an impulse under an acute angle "alpha" to a direction of a motion of a stream on a chord of traversal section of the pipeline ultrasonic. Then measure time its passages to direct and return directions also spot medial velocities of a stream on a stream chord. On the basis of the Nikuradze power law gain a distribution function of medial quantities of velocities on chords and spot weight coefficients. Determine the total of weight coefficients equal unity. Measure medial velocity of a stream on corresponding chords and calculate the fluid rate of flux. ^ EFFECT: raising accuracy of measurings on quantity to 10%. ^ 2 cl, 12 dwg, 14 tab |
