AUTOMATED FLOW CONTROL SYSTEM IN A BASIC TEST RIG FOR STUDYING OSCILLATING FLUID FLOWS
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AUTOMATED FLOW CONTROL SYSTEM IN A BASIC TEST RIG FOR STUDYING OSCILLATING FLUID FLOWS A. M. Sorokina,∗ , A. V. Boikoa,∗ ,
UDC 532.5.073
A. P. Chupakhinb , and A. A. Cherevkob
Abstract: A system for automated investigations of oscillating fluid flows in channels with the use of a special test rig is presented. In this system, a specially developed computer code defines the oscillating flow rate of the fluid and traces whether the task is performed. The test rig is tested with the use of a flowmeter. Keywords: oscillating flows, channels, hemodynamics, automated measurement system. DOI: 10.1134/S0021894420040136 INTRODUCTION A test rig for studying oscillating fluid flows was described in [1]. Such test rigs are used, e.g., in solving various problems of hemodynamics (see [2–4]). According to [1], it is necessary to ensure high repeatability of the disturbance shape and reliability of test rig operation with various fluids for a long time. The present paper describes the basic specific features of the control system of this test rig for solving the above-mentioned tasks, and advantages of the present approach over the existing methods are explained. Results of testing the test rig in the case of a flow in a circular tube are presented.
CONTROL SYSTEM The control system was developed with due allowance for the experience of hemodynamic investigations performed at the Lavrentyev Institute of Hydrodynamics of the Siberian Branch of the Russian Academy of Sciences [3–5] and of development of automated measurement systems for aerodynamic research at the Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences [6–8], which have been well approved during the long period of their operation (see, e.g., the review [9]). The main mechanical part of the test rig (Fig. 1) for studying oscillating fluid flows is the hydraulic pistondriven pump. The piston is actuated by a guide screw whose rotation, in turn, is initiated by an FL57ST76 unipolar stepping motor connected to the guide screw by an elastic sleeve. The stepping motor is controlled by an SMSD-4.2 programmable system produced by the Elektroprivod company, St. Petersburg. In contrast to many other control systems, this system provides three operation modes:
a Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia; ∗ [email protected]; ∗ [email protected]. b Lavrentyev Institute of Hydrodynamics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia; [email protected]; [email protected]. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 61, No. 4, pp. 108–113, July–August, 2020. Original article submitted January 27, 2020; revision submitted January 27, 2020; accepted for publication January 27, 2020. ∗ Corresponding author.
c 2020 by Pleiades Publishing, Ltd. 0021-8944/20/6104-0593
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Fig. 1. General view (a) and schematic (b) of the test rig for studying oscill
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