SU909642A2 - Device for measuring speed of gas or liquid flow - Google Patents

Description

one

The invention relates to the measurement of motion parameters and can be used in measuring the magnitude and direction of the velocity vector of a moving object relative to the medium, as well as in aerial and hygrodynamic studies. According to the main author. St. No. 655975, a device for measuring the flow rate of a gas or liquid is known, which contains a source of labels, two receivers, one of which is circular, and the other has the shape of an Archimedes branch line and a measuring circuit.

In order to obtain a signal according to the speed and direction of flow, this device measures two time intervals, according to the passage of time, the passers-by mark the ring receiver and the receiver ao in the form of an Archimedes spiral.

To determine the direction of the velocity vector, the ratio of time intervals is calculated. In this case, the formation of tags is made with a constant frequency of 1.

However, this device does not directly determine the direction of flow relative to the rear axle.

The purpose of the invention is to expand the functionality by non-conforming determination of the angle, directing the flow velocity relative to a given axis.

This goal is achieved by the fact that in a known device measuring

10, the circuit is designed as a phase difference meter, the inputs of which through amplifiers are connected to receivers, and the ring receiver is connected to the generator of pulses of the source of labels.

IS

The drawing shows a diagram of the proposed device.

Claims (1)

The device contains a source of 1 tags, made in the form of a discharge unit that is flush with the casing of a mobile object and connected to a generator of 2 high-voltage pulses, receiving electrodes 3 and 4, which respectively have the shape of a ring and an Archive spiral to be connected through amplifiers 5 and O coaxes meter 7 phase. Moreover, the output of the ring receiver through the amplifier 5 is connected to the generator 2 of high voltage pulses. The device works as follows. In the measurement process, the generator 2 generates a pulse, which is applied to the discharge 1, the latter creating a mark in the form of a cloud of charged ions, which moves jointly with a controlled flow, due to the spark breakdown. A span above the ring electrode 3, the label induces a pulse signal, which is amplified by amplifier 5 and restarts generator 2, causing the formation of the next label. Thus, the system that includes the elements of the device 2, 1, 3 and 5 forms an oscillator, the generation frequency f of which depends on the magnitude of the flow velocity and is determined by the expression --VR-l where Y is the velocity vector modulus; R is the radius of the ring receiver. The frequency f is used to generate the output signal V over a velocity measurement channel. In this case, the output characteristic is linear. The instantaneous spatial phase, which determines the instantaneous spatial position of the mark relative to the ring electrode 3, can be represented as, where E is the current distance between the mark and the discharge. Since in this case, the generation of a new mark occurs at 6 R, then the phase of the 1Y angle of the periodic signal, which is detected by the ring electrode, will be 2 IT. Obviously, this periodic signal can be considered as a reference with the zero phase, since its phase does not depend on the measured parameters. The phase of the signal recorded by the helix receiver 4 is determined by .lfCpR where Kdl is the Archimedes spiral radius vector; K is the coefficient determining the spiral steepness; EC is the angle of deviation of the flow velocity vector relative to a given axis. The phase difference between the two signals can be represented as lb-in-vv-2 rr1r11 ;, then the angle of the deviation of the velocity vector is defined as OSD: (d0Ha.HP: (1) / 27SK. From this ratio it can be seen that the measured angle pr proportional to the phase difference of the recorded signals. Obviously, the receivers can be positioned so that the sign of the phase angle corresponds to the sign of the angle being measured. This is achieved when the receivers are located so that they have an intersection point through which the base axis of measurement When this is done conditions |) -R f. For the purpose of averaging the phase difference of the signals and obtaining the signal in the digital code, it is advisable to use digital phase meters. Apparatus of the Invention A device for measuring the flow rate of a gas or liquid according to the author. St. No. 655975, characterized in that, with an extension circuit, by directly determining the direction angle of the flow velocity with respect to a given axis, the measurement circuit is designed as a phase difference meter, the inputs of which are connected to the receivers through amplifiers, and the ring receiver is connected to a generator pulse source tags. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 655975, cl. GOl P 5/18, 1977 (prototype).