Theoretical substantiation of the parameters of a telescopic water outlet structure with a circular cylindrical float

Abstract

The  purpose  of the research  is to improve  the design  of a water  outlet,  to calculate a telescopic outlet  with  a round-cylindrical float and  determining the diameter of the movable box float with the given parameters, which should  ensure the reliability of its static position in all possible hydraulic modes  of operation as a spillway with  a round-cylindrical cap  with  a movable position  of the  crest, depending from  the water  level in the receiving  main canal.  The  article  presents  the developed  design of the outlet  structure of the overflow outlet  structure of the telescopic type, which  has a simple design, reliability in operation, structural design  with  minimal hydraulic losses.  The  paper  shows  the results of theoretical studies of the  proposed  design  of a telescopic  outlet  structure, three  variants have  been considered for the  operation of the  movable box,  from  the  above  calculations, the  defining diameter of the float is the mode with  water  overflowing through it when  the maximum flow rate of the pipeline is supplied. The following calculated diameters of the float were obtained;  d_flo = 0.1279 m, d_fl = 0. 0808 m and  d_flt = 0.315m. It is possible  to use standard PVC pipes, the nearest  larger standard outer diameter is d = 0.355  mm.  considering the simplicity of the design  of the telescopic  type water  outlet,  it can be manufactured in the conditions of mechanical workshops of construction organizations.