SU1652851A1 - Cavitation tunnel - Google Patents

Description

I

(21) 4706440/29

(22) 06.16.89

(46) 05.30.91. Bksh. Number 20

(72) Yu.N.Vlasov and V.A. Laryonov

(53) 621.521 (088.8)

(56) USSR Author's Certificate K 1432365, cl. G 01 M 10/00, 1988.

(54) CAVITATION PIPE

(57) The invention can be used to test hydrophysical transducers. The aim of the invention is to expand the operational capabilities and use the inverse properties of the fluid by creating temperature irregularities in the turbulent flow without changing the density of the fluid. The cavitation tube contains a hydrodynamic path in the form of a pump unit 1 connected in series 1. an inlet channel 2 with a rotary elbow 3, a hydrodynamic trap 4, spraying apparatus 5 and the working section 6 with windows 7. The working section 6 is equipped with a thermoelectric module consisting of a turbulent the grid 11 with parallel thermoelectric elements, made in the form of thermal coolers of the type of refrigeration junctions and connected to the regulated current source 12. A cooling system 13 is installed between the output channel 8 and the pump unit 1. A thermometer and a receiving device of a shadow device are located opposite the windows 7. When using the inverse properties of water depending on its density on temperature, it is possible to create similar liquid densities in the stream with temperature heterogeneity during the tests of hydrophysical converters. 2 Il.

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11 6

and.

The invention relates to engineering hydraulics and can be used to test hydro physical converters.

The aim of the invention is to expand the operational capabilities by using the inverse properties of a liquid by co-forming temperature irregularities in a turbulent flow without changing the density of the liquid.

FIG. 1 shows the scheme of a cavitation pipe; in fig. 2 is a graph of water density versus temperature.

The cavitation pipe contains a hydrodynamic path in the form of a pump unit 1 connected in series, an inlet vertical channel 2 with a swivel elbow 3, a gas-dynamic trap 4, a spraying apparatus 5 and a working section 6 with optical windows 7, an output vertical channel 8 with swivel elbows 9 and 10 The working section 6 is equipped with a thermoelectric module including a turbulizing grid 11 of parallel thermoelectric elements made in the form of thermal coolers of the type of cold junctions and connected to the reg detectable source 12 current. Opposite the optical windows 7 of the working section 6 are installed thermometers and receiving equipment of a shadow device (not shown). The hydrodynamic path is equipped with a refrigeration system 13 located between the pump unit 1 and the output vertical channel 8 with a swivel elbow 10.

The refrigeration system 13 may be made in the form of a system of longitudinal pipes, the cavity of which is supplied with a cooling medium.

The cavitation pipe is barely working.

blowing way.

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A working hydrophysical transducer (not shown) is installed in the working section 6 of the hydrodynamic path of the pipe behind the turbulizing grid 11, for example, a transducer of pressure velocity pulsations. The pump unit 1 and the refrigeration system 13 are turned on. Using a medium-temperature thermometer, monitor the water temperature in the flow part of the work station 6. When the average temperature is reached

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ten

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20

25

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thirty

35

40

45

T2

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fluids, e.g. T 7 ° C, for a given flow rate, include a current source 12. The thermoelectric elements of the turbulizing lattice 11 begin to emit a cold, while in the working area 6 through the optical windows 7 there will be observed temperature irregularities visualized by the shadow device. A smooth adjustment is made of the amount of electric current supplied from the current source 12 to the thermoelectric module of the grid 11, and the temperature in the heterogeneity is adjusted to the point where the water density does not change compared to the density of the liquid at a temperature T 7 C. The change in density is monitored by the disappearance of the shadow images of temperature inhomogeneities. The temperature inhomogeneities together with the turbulent pulsations of the velocity head affect the converter under test, which can react to the informative parameter (pressure head velocity pulsations) and the non-informative parameter can (T is recorded on the source equipment (not shown). After this, the current source 12 is turned on and the response of the converter to the informative parameter only is recorded.

When the refrigeration system 13 is turned off, the average fluid increases, for example, to the environment.

Regulated current source 12 is turned on again and temperature inhomogeneities of the same amplitude are created at T4 12 ° C in a turbulent flow of that velocity. The response of the transducer to a signal consisting of an informative parameter, temperature pulsations and pressure pulsations of the velocity head caused by temperature pulsations as the density of the medium changes is determined.

By comparing the results obtained, the effective means of protecting the tested transducer from the effects of temperature pulsations and the effects of pressure head pressure pulsations caused by temperature pulsations are determined.

Claims (1)

Invention Formula A cavitation pipe containing a hydrodynamic tract in the form of a single-T 18 ° C sequentially of the pump unit, the inlet vertical channel with a swivel wheel, the gas-dynamic trap, the spraying apparatus and the working section with optical windows, the output vertical channel with the rotary bends, while the working section is equipped with a thermoelectric module including a turbulizing grid of parallel thermoelectric elements connected to a regulating current source with a thermometer and a shadow device installed opposite the optical kg / pz Yu I 1,000 0.999 five In order to expand operational capabilities by using the inverse properties of the fluid by creating temperature irregularities in the turbulent flow without changing the density of the fluid, the hydrodynamic path is equipped with a cooling system located between the pump unit and the output vertical channel, and the thermoelectric elements made in the form of thermal coolers such as cold junctions. -J FIG. 2