SU575571A1

SU575571A1 - Device for measuring alternation factor of turbulent streams

Info

Publication number: SU575571A1
Application number: SU7502149498A
Authority: SU
Inventors: Станислав Аронович Бобров; Виталий Васильевич Дегтярь; Лев Моисеевич Корсунский
Original assignee: Предприятие П/Я В-2539
Priority date: 1975-07-01
Filing date: 1975-07-01
Publication date: 1977-10-05

Description

Изобретение относитс к измерительной технике и может быть использовано дл измерени характеристик потоков жидкости газа.The invention relates to a measurement technique and can be used to measure the characteristics of a liquid gas flow.

Известны устройства дл измерени ха- рактеристик потоков жидкости газа ij.Devices are known for measuring the flow characteristics of a gas liquid ij.

Однако такие устройства не обеспечивают измерени коэффициента перемежаемости потока , показывающего, какую часть времени наблюдени существует турбулентность в потоке.However, such devices do not provide a measure of the flux intermittency ratio, indicating how much of the observation time there is turbulence in the flux.

Известно устройство дл измерени коэффициента перемежаемости, содержащее преобразователь скорости потока, подключенный к последовательно соединенным усили- телю-ограничителю и триггеру Шмитта, интегратор и индикатор .A device for measuring the intermittency coefficient is known, comprising a flow velocity transducer connected to a series-connected limiting amplifier and Schmitt trigger, an integrator and an indicator.

Недостатком этого устройства вл етс зависимость результата измерени от амплитуды сигнала на выходе преобразовател , что приводит к снижению точности и уменьшению динамического диапазона устройства.A disadvantage of this device is the dependence of the measurement result on the amplitude of the signal at the output of the converter, which leads to a decrease in accuracy and a decrease in the dynamic range of the device.

Целью изобретени вл етс повышение точности измерени и расширение динамического диапазона устройства.The aim of the invention is to improve the measurement accuracy and expand the dynamic range of the device.

Дл этого к выходу усилител -ограничител дополнительно подключены последовательно соединенные инвертор и второй триггер Шмитта, а между выходами обоих триггеров Шмитта и входом интегратора включен сумматор.For this purpose, an inverter and a second Schmitt trigger are additionally connected to the output of the limiter amplifier, and an adder is connected between the outputs of both Schmitt triggers and the integrator input.

На чертеже представлена блок-схема устройства.The drawing shows the block diagram of the device.

Преобразователь 1 скорости потока пооключен к усилителю-ограничителю 2, выход которого соединен с триггером 3 Шмигта непосредственно и с триггером 4 Шмитта через инвертор 5. Выходы триггеров Шмит- та подключены к входам сумматора б, соединенного через интегратор 7 с индикатором 8.The flow rate converter 1 is connected to the limiting amplifier 2, the output of which is connected to the Schmitt trigger 3 directly and to the Schmitt trigger 4 via the inverter 5. Schmitt trigger triggers are connected to the inputs of the adder b connected via the integrator 7 with the indicator 8.

Устройство работает следующим образом.The device works as follows.

Claims

The pulsation of the flow is converted by the speed converter 1 into an alternating electrical signal, which is amplified and limited in actuality by the amplifier-limiter 2. Then this signal is sent to two parallel branches. In one branch, the trigger is a Schmitt trigger 3, one of the half-waves of the alternating signal is converted into a rectangular pulse. To transform the second half-wave, there is a second branch consisting of a series-connected inverter 5 and Schmitt trigger 4. Both pulse sequences are summed and fed to integrator 7, the output of which relieves a voltage proportional to the total pulse duration of both successive ones and. This voltage is applied to indicator 8, with which the value of the intermittency coefficient is measured. Claims An apparatus for measuring the intermittency coefficient of turbulent flows, comprising a flow velocity transducer. connected to a serially connected amplifier limiter and trigger UJMHTTa, an integrator and an indicator, characterized in that, in order to improve the accuracy of measurement and expansion of the dynamic range of the device, the series-connected inverter and the second trigger UjMHTTa are additionally connected to the output of the limiter amplifier Triggers Shksttta and integrator input enabled adder. Sources of information taken into account in the examination: 1. USSR author's certificate number 498552, Q 01, p 5/00, 1973.

2.M. Kin, V.P., Donchenko, E.G. Electronic Systems for Automated Measurement of Fluid and Gas Flow Characteristics, Moscow, Energii, 1970, p. 27.