SU488140A1 - The method of measuring the rms value of the pulsations of the velocity of the liquid phase of a gas-liquid flow - Google Patents

Description

Channel 4 is connected with a time delay signal and forming channel 5, to which block 6 is also connected to determine the intermittency coefficient. Both channels are connected to the switch 7. The signals from the switch and the unit for determining the intermittency coefficient are fed to the attenuator 8, and the output signal from the attenuator is given by a voltmeter of 9 mean square values.

During the movement of a gas-liquid flow, the sensor of a thermometer detects fast-variable values of the velocity of the liquid phase and also gas inclusions; the characteristic signal is represented in the time diagram. Dependence irotekeyun1, interp flow in; The sensor is proportional to the velocity of the fluid flow, heat exchange in the fluid, and heat exchange in the gas phase. The magnitudes of the current in the liquid; i gas phase are significantly different in levels. Since sensor 1 has a low inertia, it is possible to record both velocity pulsations and emissions corresponding to gas inclusions m.

The output signal from the hot-wire anemometer enters the channel channel.

In Kagal 4, the electrical signal is delayed by a time, -, where m; - time of passage of gas inclusion. In the M-channel of channel 5, the signal from the hot-wire anemometer 3 is delayed for time, but T2-STg, and the leading edge of the signal ejection from the thermo-thermometer and the back of the delayed signal are generated by control pulses; switch 7, to which a signal is delayed in channel 4. At the output of the switch 7, a signal is received without outliers. D) the intermittent factor is determined by the current connected to the forming channel 5; the gas-liquid flow as the sum of the times corresponding to the gas turn on for the specified integration time:

K -,

where K is the coefficient of intermittency;

ET; - sum of times corresponding to gas inclusions during integration;

to-time integration. A signal proportional to the intermittency coefficient controls the attenuator 8, to which a signal from switch 7 is supplied. A voltmeter 9 of rms values is connected to the output of the attenuator, the readings of which are the rms value of the liquid phase liquid-gas flow.

Claims (1)

Invention Formula The method of measuring the root-mean-square value of the pulsations of the velocity of the liquid phase of the gas-flux flow, based on the differentiation of the thermoanemometer signal, characterized in that, in order to simplify and reduce the value of the thermoaneMOMeiipa, the signal is delayed in time and the switch is applied, timed pulses corresponding to the sum of the dwell time of the sensor in the gaseous environment and the delay time, the output signal from the switch is fed to the attenuator, the unit is controlled to determine the intermittency coefficient, n The proportional ratio of the amount of time the sensor of the hot-wire anemometer in gas averaged to the specified integration time and the output of the attenuator are measured with a volt-meter rms value. 111 i ii. Aav. ||, h. FIG. 2 3adepfXOHHbiy signal HoSpe, 1i S and a f a fie 5cdevMaHHbiv signal / fio SpeM / J I S on nánale 5 and the pulses would go 5 Sugio / s nommitator ilf- N