RU1825942C - Stand for study of hydrodynamic characteristics of cryogen - Google Patents

Abstract

Usage: the invention relates to cryogenic technology and can be used in systems using cryogen-. ny two-phase working environments. SUMMARY OF THE INVENTION: The test bench assembly is provided with a closed zigzag superconductor 11 mounted in the test chamber 8, a conductive shield 12 and four conductive communication pins 13. The stand additionally contains two switches 14 and 15, a detector 16, an extreme controller 19, a high-frequency controlled generator 17 and a recorder 18.1 il.

Description

w

W

&

00 N SP CE

4 Yu

The invention relates to measuring technique and can be used in systems using cryogenic two-phase media moving in circular channels.

The aim of the invention is to increase the accuracy of the study of hydrodynamic characteristics in the two-phase cryoagent flow mode by taking into account its volumetric vapor content. The drawing shows a diagram of the stand. The refrigeration unit 1 is connected via line 2 through a valve 3 to a heat exchanger 4 installed in a cryostat 5, a flowmeter 6, a heater 7, a transparent test chamber 8 with a thermometer 9 and a pressure gauge 10. A closed zigzag superconductor 11 is coated on a transparent test chamber 8, surrounded by a conductive shield 12. Between the superconductor 11 and the shield 12, there are communication pins 13 connected in pairs with the first 14 and second 15 switches, which, in turn, are connected to the detector 16 and the first high-frequency output 25 the second controlled oscillator 17, the second output of which is connected to the recorder 18. The output of the detector 16 is connected to the control input of the generator 17 through the extreme regulator 19. The test chamber is 30 Pa and it is enclosed in a transparent vacuum casing 20.

The stand works as follows. The cryoagent stream from the refrigeration unit 1 along the line 2 with open fan 3 is formed when passing through the heat exchanger 4, the flow meter 6 and the heater 7 and enters the test chamber 8, where it can be photographed or visually examined. Information about temperature and dzblelia is taken from the thermometer 9 and manometer 10, and about the steam content from the recorder 18. The closed superconductor 11 in the screen 12 forms a two-wire long line, therefore, at resonance, since the potential is distributed across the sine, the electric field is test chamber 8 will be constant. The resonance frequency of the long line depends on the vapor content of the stream and its structure at a fixed 50 vibration excitation site, however, when two types of oscillations with crossed electric fields are excited, their average resonant frequency does not depend on the structure of the flow and is only a function of 55 vapor content. Excitation of these types

oscillations are carried out using pairwise opposite communication pins 13. High-frequency oscillations from the generator 17 are alternately supplied through two second communication pins 15 to two adjacent communication pins and excite resonance oscillations in the superconductor 11, which are transmitted through the first switch 14 to detector 16. Extreme regulator 19, by the signal from the detector 16, controls the operation of the generator 17, maintaining the oscillation frequency equal to the resonance (since the resonance frequency is characterized by the extremum of the signal from the detector 16). From the second output of the generator 17, an informative signal is supplied to the recorder 18. The use of a superconductor 11 cooled by a controlled stream leads to an increase in the quality factor of resonant oscillations, and, consequently, to an increase in the accuracy of maintaining the resonant frequency by the extremal regulator 19.

Claims (1)

SUMMARY OF THE INVENTION A stand for studying the hydrodynamic characteristics of a cryoagent, comprising a refrigeration unit connected in series, a heat exchanger, a flowmeter and a heater installed in a cryostat, and a test assembly comprising a transparent test chamber with a manometer and a thermometer enclosed in a transparent vacuum casing, characterized in that, for the purpose of, improving the accuracy of the study of hydrodynamic characteristics in the two-phase cryoagent flow mode by taking into account its volumetric vapor content, equipped with a closed zigzag superconductor installed in the test chamber, a conductive screen placed in the casing and covering the superconductor, and four insulated conductive communication pins installed between them parallel to the axis of the test chamber, and the stand additionally contains two switches, a detector, extreme regulation a torus, a high-frequency controlled generator and a registrar, the input of one of the switches being connected to two adjacent pins, the output through a detector with extreme control Hur, the entrance of another switch connected to the generator output, with the other two pins and the generator is connected to the logger and controller extreme torus.