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УДК 532.54.013.2

 

Yahno1 A., Hnativ2 R.
1 - Technical University «Kyiv Polytechnic Institute», Kyiv, Ukraina
2 - «Politechnika Lwowska», Lviv, Ukraina

 

DEPENDENCE OF THE AVERAGE FLOW RATE FROM RISING PRESSURE IN UNSTEADY FLUID MOVEMENT IN PIPELINE

 

Experimental researches show that at motion of liquid from a spacehold, in a stream the mode of laminar of flow is saved at the greater instantaneous values of number of Reynol'dsa, than at stationary motion. Important is a question of dependence of origin of turbulence from descriptions of transient. The purpose of the offered work are experimental and theoretical researches for establishment of dependence of change of middle speed from growth of pressure at an unwithstand motion of liquid in pipes. Experimental information, got in the process of research of transients, is resulted in this work. It is got dependence between middle speed, at which firmness of the mode of laminar of flow is lost and by speed of growth of pressure. The moments of passing to the  turbulent flow are certain comparison of the experimentally got middle speed with middle speed, certain a theoretical calculation. The results of the conducted researches allow to determine these sizes and take into account their influence at the transients of an unwithstand motion of liquid in pipelines.

Keywords: instable, non-stational, liquid of movement.


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