Electric device for getting pattern of liquid flow disturbed by capacitors in water tunnel

FIELD: aviation industry.

SUBSTANCE: device helps to get real pattern of liquid pressure distribution which flows about "blown-about" object in water tunnel. Device has driven frequency pulse oscillator, frequency divider, control pulse counter, longitudinal contact multiplexer which connect capacitors with shelves, lateral contact multiplexer which connect the other output of capacitors, matching unit, analog-to-digital converter, indication unit, water tunnel, blown-about object, grid with capacitive detector.

EFFECT: improved precision of measurement.

2 dwg

 

The invention relates to the aviation industry and can be used in the study of various aircraft in hydrodynamic "pipes", as well as in various sectors of the economy where it is necessary to investigate the turbulence of liquids in pipelines or confined spaces.

A device containing a grid with conductors, the intersection of which is soldered thermal resistance where the change in fluid density varies with temperature and flow (see Patent RU 2133022, CL G 01 N 9/04,1999.)

The disadvantage of this device is the low accuracy of measurements of volumetric thermal resistance, insufficient objective picture of the pressure distribution along the plane of the lattice, a large flow resistance and the technical complexity of manufacture. There is no specific value of the velocity and pressure at each point of the broken stream of liquid.

The objective of the invention is to obtain an objective picture of the distribution of fluid density "blown" object in a hydrodynamic tunnel along all three axes - obtaining three-dimensional images perturbed flow.

The solution of the stated problem is achieved using the moving plates of the capacitors in the oncoming fluid when changing the cross-sectional area of the plates.

As a researcher who is named as the sensors used lattice in the form of frame 4 (figure 1), which consists of 5 longitudinal and transverse conductors 6. At the intersection of conductors vpaivaetsja capacitors. The capacitance of the capacitor formed by two flat parallel plates, one of which is connected with the longitudinal conductors and the other with the cross. The capacitance of the capacitor is calculated as follows:

where ε - the relative permittivity of the material located between the plates;

S - area of mutual overlap of the plates;

d is the distance between the plates.

As can be seen from the formula, the capacitance depends on the area of overlap of the plates (S).

Changing the overlapping area of the plates, will provide an electrical signal proportional to the change in velocity and density - the picture perturbed fluid stream.

One of the plates of the capacitor has a "shelf" to increase the rolling resistance of the liquid, which leads to changes in the area of mutual overlap of the plates. To reduce the error in the plane of the conductor plates of the capacitors with shelves between them spanned more unpowered wire and soldered at the intersection (Fig 1)

The ends of the conductors are connected with the multiplexers 3 longitudinal and 2 transverse. When the flow of fluid through the bars 1 multiplexers according to the control signals will be connected one by one PR is the Vodnik to the measurement system. Example: multiplexer 2 switches conductor number five, and the multiplexer 3 commutes Explorer seven. Measuring capacitance between points a and b, etc.

Figure 1 shows the lattice 1 with frame 4, in which the stretched longitudinal and transverse wires, the intersection of which is soldered capacitors. Figure 2 shows the unit of measurement of flux density for the aircraft with all major elements.

The device operates as follows. The pulse generator 7 (figure 2) produces a sequence of pulses proportional to the capacitance of the capacitor. The frequency divider 8 divides the sequence of pulses necessary to measure and control the proportions. The pulse counter 9 converts a sequence of pulses in the binary code required to control the multiplexers 2 and 3, which connect the received signal to measure through a matching device 10 to the analog-to-digital Converter 11. Analog-to-digital Converter signal proportional to the flux density at this point, is induced on the indicator 12.

The signal multiplexers comes with sensor-grid 1 in the form of a frame 4 that is installed in the gas-dynamic tube 13, which has investigated the model 14.

This device allows you to extend the diagnostic who is agnosti rotating stall flow models, designed for full-scale tests.

Electrical device get a picture of the perturbed fluid flow in hydrodynamic pipe capacitors includes means for forming a flow of a fluid, streamlined body, and the sensors are made in the form of a lattice-frame consisting of longitudinal and transverse wires, and the device is provided with multiplexers pulse generator, a frequency divider, analog-to-digital converters and a display device, characterized in that the intersection of conductors fixed capacitor consisting of two flat parallel plates, one of which is connected with the longitudinal conductors and the other with a cross, one of the plates of the capacitor has a shelf to increase the rolling resistance of the liquid that leads to a change in the area of mutual overlap of the plates and in the plane of the conductor plates of the capacitors with shelves between them are strained non-current carrying wire and soldered at the intersection.



 

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