CN111122395A - Mobile supersonic nozzle continuous measurement system - Google Patents
Mobile supersonic nozzle continuous measurement system Download PDFInfo
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- CN111122395A CN111122395A CN201911229750.5A CN201911229750A CN111122395A CN 111122395 A CN111122395 A CN 111122395A CN 201911229750 A CN201911229750 A CN 201911229750A CN 111122395 A CN111122395 A CN 111122395A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means, e.g. by light scattering, diffraction, holography or imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention relates to a mobile supersonic nozzle continuous measurement experiment system, which comprises a mobile supersonic nozzle experiment device and a software closed-loop control system; the system can obtain the unsteady condensed flow pressure fluctuation characteristic of the supersonic nozzle through the relative motion of the rectangular nozzle and the high-frequency response pressure sensor, overcomes the defect of poor consistency of the traditional supersonic nozzle along-the-way pressure measurement, and measures the droplet size distribution of all areas of the supersonic nozzle by adopting an extinction method; the system realizes multi-channel data acquisition, automatic storage and out-of-limit alarm through a data acquisition program, and continuous large-capacity dynamic data is stored by establishing a database; the system adopts motor pulsation control, the control precision is 0.01mm, and the synchronization of data acquisition and motor control is realized; the invention not only considers the continuous measurement of experimental data of the supersonic nozzle, but also realizes the closed-loop control of system software, and can be used for experimental research of the condensation characteristic of the supersonic nozzle.
Description
Technical Field
The invention belongs to the field of gas-liquid two-phase flow measurement, and relates to a mobile supersonic nozzle continuous measurement system.
Background
The supersonic nozzle is a core component in supersonic equipment and is widely used at presentWidely applied to the fields of petroleum, natural gas, chemical industry, pharmacy, energy conservation, environmental protection, aviation, aerospace and the like[1]. The supersonic cyclone separation technology is a multi-component gas condensation separation method combining cyclone separation technology and condensation separation technology[2]Supersonic nozzles are key components of supersonic separators that produce a coagulation effect. The condensation effect is that the saturated wet steam expands to supersonic speed in the supersonic nozzle when passing through the supersonic nozzle, low pressure and low temperature are generated, and liquid phase is condensed and nucleated[3]. The research method of the condensation phenomenon of the supersonic nozzle can adopt theoretical analysis, numerical simulation and experimental methods. Due to the complexity of the spontaneous condensation effect, the experimental method for researching the internal condensation characteristic of the supersonic nozzle is very important. Research on coagulation effect in supersonic nozzles requires that the pressure distribution of the nozzle tube flow field and the droplet size distribution are essential factors.
The traditional method for measuring the on-way pressure is to drill a series of pressure guide holes around the throat part of the nozzle and load a pressure sensor to measure the pressure[4]. Because a plurality of pressure guide holes need to be drilled in the traditional experimental device, the pressure guide holes are not in the same horizontal plane, the equivalence of pressure data near the condensation position of the throat part cannot be completely explained, and meanwhile, the types of pressure sensors at different sections are different, and the consistency is relatively poor. And because the size of the nozzle is small, the pressure guide holes cannot be arranged too much, so that the pressure at a plurality of pressure guide holes can be measured, and the continuous measurement of the pressure along the nozzle cannot be realized.
Disclosure of Invention
The invention provides a mobile supersonic nozzle continuous measurement experiment system. The device comprises a mobile supersonic nozzle experimental device and a software closed-loop control system. The experimental system can obtain the unsteady condensation flow characteristics of the supersonic nozzle.
In order to solve the problems in the prior art, the invention adopts the following technical scheme:
1. a mobile supersonic nozzle continuous measurement system comprises a mobile supersonic nozzle experimental device and a software closed-loop control system, wherein the mobile supersonic nozzle experimental device is composed of a mobile supersonic nozzle, a driving motor, an air source mechanism and an experimental data measurement mechanism; wherein: the movable supersonic nozzle comprises a nozzle base body, a rectangular nozzle and a transmission rod;
the software closed-loop control system comprises a static data acquisition module, a continuous dynamic data acquisition module, a motor drive control module and a database; wherein:
the static data acquisition module adjusts an air source through the acquired inlet pressure and temperature and humidity values to enable an experiment system to reach set experiment conditions;
the continuous dynamic data acquisition module analyzes and fuses data measured by the experimental data measurement mechanism to obtain the unsteady condensation flow characteristic of the supersonic nozzle;
the motor drive control module indirectly drives the rectangular nozzle to move, and the supersonic nozzle along-path pressure distribution and the droplet particle size measurement of the whole area are realized through the relative motion of the rectangular nozzle and the dynamic measurement part in the experimental data measurement mechanism;
the database records continuous high-capacity dynamic data acquired by the continuous dynamic data acquisition module.
The experimental data measuring mechanism comprises: the device comprises an inlet pressure sensor, an inlet temperature and humidity sensor, an outlet pressure sensor, an outlet temperature and humidity sensor, a high-frequency response pressure sensor and an extinction method liquid drop granularity measuring instrument; wherein:
the movable supersonic nozzle is connected with the driving motor through a transmission rod;
the inlet of the nozzle base body is connected with the air source mechanism, and an inlet pressure sensor and an inlet temperature and humidity sensor are mounted at the inlet of the nozzle base body;
the outlet pressure sensor and the outlet temperature and humidity sensor are mounted at the outlet of the nozzle base body;
a high-frequency-response pressure sensor is arranged on the inner wall of the nozzle base body;
and the front side and the rear side of the middle position of the nozzle matrix are provided with extinction method liquid drop granularity measuring instruments which are respectively a measuring instrument light transmitting part and a measuring instrument light receiving part.
The software closed-loop control system adopts the following algorithm to obtain the unsteady condensation flow characteristic of the supersonic nozzle:
s1, opening an air source mechanism, and adjusting an air source by the static data acquisition module through comparing preset inlet pressure, temperature and humidity values with a sensor display value to enable an experiment system to reach set experiment conditions;
s2, the motor driving control module controls the driving motor by adopting a mode of setting a pulse generator, sets pulse driving parameters, starts the driving motor, and drives the motor to rotate to enable the nozzle to move; the motor driving control module controls the motor precision by comparing the input pulse number with the motor receiving pulse number;
s3, outputting the pulse number required by one-time on-way pressure measurement by the motor driving control module, and after the rectangular nozzle moves in place once, starting to read the data of the high-frequency response pressure sensor and the data of the extinction method liquid drop granularity measuring instrument by the continuous dynamic data acquisition module;
s4, after the data reading is finished, the step S3 is circulated, the motor is controlled to rotate continuously to enable the rectangular nozzle to move continuously, all data collected by the continuous dynamic data collection module are analyzed and fused, and the on-way pressure distribution and the droplet size distribution of all areas of the nozzle can be obtained;
and S5, after the set output pulse number is finished, the digital pulse output unit in the continuous dynamic data acquisition module controls a Boolean button to trigger the motor to stop, and meanwhile, the local variable of the Boolean button in the data measurement block diagram is also effective, so that the while circulation in the data measurement structure is triggered to stop, and the data measurement is stopped.
Advantageous effects
1. The invention comprises a movable supersonic nozzle experimental device and a software closed-loop control system, can obtain the unsteady condensed flow pressure fluctuation characteristic of the supersonic nozzle through the relative motion of a rectangular nozzle and a high-frequency response pressure sensor, overcomes the defect of poor consistency of the conventional supersonic nozzle along-the-way pressure measurement, and measures the droplet size distribution of all regions of the supersonic nozzle by adopting an extinction method. The measured on-way pressure distribution and the droplet particle size distribution information are fused, so that the unsteady condensation flow characteristic of the supersonic nozzle can be obtained.
2. The invention realizes multi-channel data acquisition, automatic storage and out-of-limit alarm through a data acquisition program, and continuous large-capacity dynamic data is stored by establishing a database.
Drawings
FIG. 1 is a schematic cross-sectional view of a mobile supersonic nozzle experimental apparatus;
FIG. 2 is a flow chart of a software closed loop control system;
FIG. 3 is a schematic diagram of a data processing module.
Detailed Description
In order to further understand the features and technical means of the present invention and achieve specific objects and functions, the following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings.
The schematic section view of the mobile supersonic nozzle experimental device is shown in fig. 1, and the mobile supersonic nozzle experimental device comprises a mobile supersonic nozzle, a driving motor 2, an air source mechanism 3 and an experimental data measuring mechanism.
The traveling supersonic nozzle includes a nozzle base 11, a rectangular nozzle 12, and a drive rod 13. The rectangular nozzle 12 is fixedly connected with the transmission rod 13, and the rectangular nozzle 12 is driven to do translational motion through the translational motion of the transmission rod 13; the rectangular nozzle 12 and the transmission rod 13 are embedded in the inner cavity of the nozzle base body 11 in a sliding manner, and the inner cavity formed by the rectangular nozzle 12 and the nozzle base body 11 forms the cross sectional area of the movable supersonic nozzle; the cross-sectional area of the supersonic nozzle is changed continuously due to the translation of the rectangular nozzle 12, so that the moving type is realized.
The experimental data measuring mechanism comprises an inlet pressure sensor 41, an inlet temperature and humidity sensor 42, an outlet pressure sensor 43, an outlet temperature and humidity sensor 44, a high-frequency response pressure sensor 45 and an extinction method liquid drop granularity measuring instrument 46. The high-frequency response pressure sensor 45 is arranged in a pressure guide hole of the nozzle base body wall 11, the measurement of the transient pressure of the nozzle along the way is realized through the relative movement of the rectangular nozzle 12 and the high-frequency response pressure sensor 45, and the unsteady condensation flow pressure fluctuation characteristic of the supersonic nozzle can be obtained. The extinction method droplet size measuring instrument 46 is used for measuring droplets with the particle size of 0.01-1 mu m in the pipeline DN40-DN80, adopts a multi-wavelength extinction method to measure and invert the droplet size and concentration, and adopts a signal cross-correlation method to measure the droplet speed. As shown in fig. 1, extinction droplet size measuring instruments, which are a measuring instrument light transmitting portion and a measuring instrument light receiving portion, are installed on both front and rear sides of the center of the nozzle base 11. The basic principle is that a sending light source passes through a measuring area, the sending light can be attenuated due to the scattering phenomenon of water drops in the measuring area, and the size and the particle size distribution of the water drops are obtained through inverse calculation by measuring the sending light intensity and the transmission light intensity. Due to the relative motion between the extinction droplet sizer 46 and the rectangular nozzle 12, the droplet size distribution over the entire area of the supersonic nozzle can be measured. The measured on-way pressure distribution and the droplet particle size distribution information are fused, so that the unsteady condensation flow characteristic of the supersonic nozzle can be obtained.
Referring to fig. 2, the software closed-loop control system includes a static data acquisition module, a continuous dynamic data acquisition module, a database (as shown in fig. 3), and a motor drive control module; the software closed-loop control system adopts the following algorithm to obtain the unsteady condensation flow characteristic of the supersonic nozzle:
s1, opening an air source mechanism, and adjusting an air source by the static data acquisition module through comparing preset inlet pressure, temperature and humidity values with a sensor display value to enable an experiment system to reach set experiment conditions;
s2, the motor driving control module controls the driving motor by adopting a mode of setting a pulse generator, sets pulse driving parameters, starts the driving motor, and drives the motor to rotate to enable the nozzle to move; the motor driving control module controls the motor precision by comparing the input pulse number with the motor receiving pulse number;
s3, outputting the pulse number required by one-time on-way pressure measurement by the motor driving control module, and after the rectangular nozzle moves in place once, starting to read the data of the high-frequency response pressure sensor and the data of the extinction method liquid drop granularity measuring instrument by the continuous dynamic data acquisition module;
s4, after the data reading is finished, the step S3 is circulated, the motor is controlled to rotate continuously to enable the rectangular nozzle to move continuously, all data collected by the continuous dynamic data collection module are analyzed and fused, and the on-way pressure distribution and the droplet size distribution of all areas of the nozzle can be obtained;
and S5, after the set output pulse number is finished, the digital pulse output unit in the continuous dynamic data acquisition module controls a Boolean button to trigger the motor to stop, and meanwhile, the local variable of the Boolean button in the data measurement block diagram is also effective, so that the while circulation in the data measurement structure is triggered to stop, and the data measurement is stopped.
Referring to fig. 3, the static data acquisition module adjusts the gas source according to the acquired inlet pressure and temperature and humidity values, so that the experimental system reaches the set experimental conditions; the continuous dynamic data acquisition module analyzes and fuses data measured by the experimental data measurement mechanism to obtain the unsteady condensation flow characteristic of the supersonic nozzle; the data acquisition, automatic storage and out-of-limit alarm of multiple channels are realized through a data acquisition program, and the continuous high-capacity dynamic data is stored by establishing a database.
The above embodiments are intended to explain the technical solutions of the device structure, the control strategy, etc. of the present invention in detail, and the present invention is not limited to the above implementation routines, but it is within the scope of the present invention that a person of ordinary skill in the art should modify and replace the present invention based on the above principles and spirit.
Claims (3)
1. A mobile supersonic nozzle continuous measurement system comprises a mobile supersonic nozzle experimental device and a software closed-loop control system, and is characterized in that:
the mobile supersonic nozzle experimental device consists of a mobile supersonic nozzle, a driving motor, an air source mechanism and an experimental data measuring mechanism; wherein: the movable supersonic nozzle comprises a nozzle base body, a rectangular nozzle and a transmission rod;
the software closed-loop control system comprises a static data acquisition module, a continuous dynamic data acquisition module, a motor drive control module and a database; wherein:
the static data acquisition module adjusts an air source through the acquired inlet pressure and temperature and humidity values to enable an experiment system to reach set experiment conditions;
the continuous dynamic data acquisition module analyzes and fuses data measured by the experimental data measurement mechanism to obtain the unsteady condensation flow characteristic of the supersonic nozzle;
the motor drive control module indirectly drives the rectangular nozzle to move, and the supersonic nozzle along-path pressure distribution and the droplet particle size measurement of the whole area are realized through the relative motion of the rectangular nozzle and the dynamic measurement part in the experimental data measurement mechanism;
the database records continuous high-capacity dynamic data acquired by the continuous dynamic data acquisition module.
2. The mobile supersonic nozzle continuous measurement system of claim 1, wherein:
the experimental data measuring mechanism comprises: the device comprises an inlet pressure sensor, an inlet temperature and humidity sensor, an outlet pressure sensor, an outlet temperature and humidity sensor, a high-frequency response pressure sensor and an extinction method liquid drop granularity measuring instrument; wherein:
the movable supersonic nozzle is connected with the driving motor through a transmission rod;
the inlet of the nozzle base body is connected with the air source mechanism, and an inlet pressure sensor and an inlet temperature and humidity sensor are mounted at the inlet of the nozzle base body;
the outlet pressure sensor and the outlet temperature and humidity sensor are mounted at the outlet of the nozzle base body;
a high-frequency-response pressure sensor is arranged on the inner wall of the nozzle base body;
and the front side and the rear side of the middle position of the nozzle matrix are provided with extinction method liquid drop granularity measuring instruments which are respectively a measuring instrument light transmitting part and a measuring instrument light receiving part.
3. The mobile supersonic nozzle continuous measurement system according to claim 2, wherein: the software closed-loop control system adopts the following algorithm to obtain the unsteady condensation flow characteristic of the supersonic nozzle:
s1, opening an air source mechanism, and adjusting an air source by the static data acquisition module through comparing preset inlet pressure, temperature and humidity values with a sensor display value to enable an experiment system to reach set experiment conditions;
s2, the motor driving control module controls the driving motor by adopting a mode of setting a pulse generator, sets pulse driving parameters, starts the driving motor, and drives the motor to rotate to enable the nozzle to move; the motor driving control module controls the positioning precision of the motor by comparing the input pulse number with the motor receiving pulse number;
s3, outputting the pulse number required by one-time on-way pressure measurement by the motor driving control module, and after the rectangular nozzle moves in place once, starting to read the data of the high-frequency response pressure sensor and the data of the extinction method liquid drop granularity measuring instrument by the continuous dynamic data acquisition module;
s4, after the data reading is finished, the step S3 is circulated, the motor is controlled to rotate continuously to enable the rectangular nozzle to move continuously, all data collected by the continuous dynamic data collection module are analyzed and fused, and the on-way pressure distribution and the droplet size distribution of all areas of the nozzle can be obtained;
and S5, after the set output pulse number is finished, the digital pulse output unit in the continuous dynamic data acquisition module controls a Boolean button to trigger the motor to stop, and meanwhile, the local variable of the Boolean button in the data measurement block diagram is also effective, so that the while circulation in the data measurement structure is triggered to stop, and the data measurement is stopped.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113390765A (en) * | 2021-06-30 | 2021-09-14 | 中国人民解放军战略支援部队航天工程大学 | Research method for influence of shock wave on evaporation process of fuel liquid drops under supersonic airflow |
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