CN211527774U - Heat exchanger multi-field synchronous measurement system - Google Patents
Heat exchanger multi-field synchronous measurement system Download PDFInfo
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- CN211527774U CN211527774U CN202020389994.1U CN202020389994U CN211527774U CN 211527774 U CN211527774 U CN 211527774U CN 202020389994 U CN202020389994 U CN 202020389994U CN 211527774 U CN211527774 U CN 211527774U
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Abstract
The utility model discloses a heat exchanger multi-field synchronous measurement system, which comprises a circulating water tunnel experiment platform, a temperature change image speed measurement subsystem and a pressure measurement subsystem; the circulating water tunnel experiment platform comprises a heat exchanger, a water tank, a submersible pump, an electromagnetic flowmeter and a frequency converter, the temperature change image speed measurement subsystem comprises a thermocouple, a heat source and a PLC (programmable logic controller), and the pressure measurement subsystem comprises a pressure sensor; the heat exchanger comprises a heat exchanger body and a base detachably connected with the heat exchanger body, a microstructure is arranged on the base, and a thermocouple and a heat source are fixed on the base. The utility model discloses a build miniature circulation water tunnel experiment platform test heat exchanger's heat transfer drag reduction effect, reduced manufacturing and test cost.
Description
Technical Field
The utility model relates to a miniature hydrologic cycle water conservancy and energy-conserving engineering technical field especially relate to a heat exchanger multi-field synchronous measurement system.
Background
Since the energy crisis outbreak since the seventies of the last century, environmental and socioeconomic problems centered on energy have been increasingly aggravated, countries in the world have fully recognized the significance of energy conservation, and the efficiency of energy utilization has become a core problem of development. In order to improve the utilization efficiency of energy and relieve the situation of energy shortage, all countries in the world actively explore new ways for energy conservation. For example, how to efficiently recover a large amount of waste heat in the industrial production processes of chemical industry, petroleum and the like and make full use of the waste heat is researched, and the heat exchanger with the most economical life cycle cost and the highest efficiency can be developed for small compact air conditioners and the like.
The heat exchanger is important equipment in a thermal process and is widely applied to industries such as chemical industry, petroleum, refrigeration, metallurgy, energy, power, medicine and the like. According to statistics, in a thermal power plant, the investment of a heat exchanger accounts for more than 60% of the total investment of the whole power plant; in general petrochemical enterprises, the heat exchanger accounts for 40-50% of the total investment; in the refrigerating machine, the mass of the evaporator accounts for 30-40% of the total mass of the refrigerating machine, and the aerodynamic consumption accounts for about 20-30% of the total value. Therefore, from the viewpoint of energy saving, materials, low investment and operation cost, and sustainable development, it is necessary to develop heat exchangers with various drag reduction microstructures having high heat exchange efficiency and small fluid resistance.
There are many at home and abroad and reference bionics result, study structure and heat transfer, fluidology law, realize the maximum energy-conservation, utility model a lot of drag reduction, energy-conserving microstructure product, developed the surface and had the mould similar to sharkskin or lotus leaf micro-structure internal surface based on various advanced manufacturing means. In order to test the resistance reduction or heat transfer effect of the structures, a large number of fluid test experiments are required, and the fluid experiments are usually completed in a water tunnel or a wind tunnel.
The method for measuring the fluid flow characteristics of the microstructure by adopting the water tunnel or the wind tunnel is a conventional method, but the price for building a whole set of large water tunnel or wind tunnel is very expensive, and meanwhile, a sample tested in the water tunnel or the wind tunnel must meet the size requirements of certain length and width, otherwise, a stable boundary layer cannot be formed, so that the influence of the tested sample on the fluid flow cannot be measured.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides a heat exchanger multi-field synchronous measurement system, aims at realizing the heat transfer drag reduction effect through buildding miniature circulation water tunnel experiment platform test heat exchanger, reduces manufacturing and test cost.
In order to realize the aim, the utility model provides a heat exchanger multi-field synchronous measurement system, which comprises a circulating water tunnel experiment platform, a temperature change image speed measurement subsystem and a pressure measurement subsystem;
the circulating water tunnel experiment platform comprises a heat exchanger, a water tank, a submersible pump, an electromagnetic flowmeter and a frequency converter, the temperature change image speed measurement subsystem comprises a thermocouple, a heat source and a PLC (programmable logic controller), and the pressure measurement subsystem comprises a pressure sensor;
the heat exchanger comprises a heat exchanger body and a base detachably connected with the heat exchanger body, the heat exchanger body and the base are sealed to form a heat exchange cavity, a microstructure is arranged on the base, and the thermocouple and the heat source are fixed on the base;
the submersible pump is located in the water tank, the submersible pump is connected with one end of the heat exchanger body, the other end of the heat exchanger body is connected with the water tank, the electromagnetic flow meter is sequentially connected between the other end of the heat exchanger body and the water tank, the thermocouple, the electromagnetic flow meter and the frequency converter are respectively connected with the PLC, and the frequency converter is further connected with the submersible pump.
The utility model discloses a further technical scheme is, still including the heat dissipation fan, the heat dissipation fan connect in the immersible pump with between the heat exchanger body.
The utility model discloses a further technical scheme is, still including connect in electromagnetic flowmeter with temperature sensor between the other end of heat exchanger body, temperature sensor still with the PLC controller is connected.
The utility model discloses a further technical scheme be, still include with the display screen that the PLC controller is connected.
The utility model discloses a further technical scheme is, the one end and the other end of heat exchanger body are gradually flaring or convergent mouth shape.
The utility model discloses many field synchronous measurement system of heat exchanger's beneficial effect is:
1. the utility model can greatly reduce the cost for constructing the experiment platform by constructing the small-sized circulating water tunnel experiment platform, realize the miniaturization of constructing the water tunnel and the improvement of the measurement precision, and has simple operation and unlimited site;
2. for a small water circulation system, the size of the sample to be measured can be greatly reduced, and although the resistance characteristic formed by the fluid flowing through the sample at one time is not obvious, the effect can be amplified continuously through circulation accumulation. Therefore, the size of the sample needing to be processed and prepared can be greatly reduced, so that the processing production cost and the testing cost are reduced.
3. The utility model discloses built the temperature variation image speed measurement subsystem, not only can measure fluidic resistance field, also can measure the temperature field simultaneously, realized the effect of the many field measurements of a system.
Drawings
FIG. 1 is a schematic structural diagram of a preferred embodiment of the multi-field synchronous measurement system of the heat exchanger of the present invention;
the purpose of the present invention, its implementation, functional features and advantages will be described with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Consider that to adopt water tunnel or wind-tunnel to measure the fluid flow characteristic of micro-structure among the prior art usually, but the price of building a whole set of large-scale water tunnel or wind-tunnel is very expensive to, the sample of testing also must reach the dimensional requirement of certain length and width in water tunnel or wind-tunnel simultaneously, otherwise, can't form stable boundary layer, lead to can't measuring the influence of being surveyed the sample to fluid flow, from this, the utility model provides a solution.
Specifically, the utility model provides a many field synchronization measurement system of micro-structure surface heat exchanger based on small-size circulating water hole.
The utility model discloses the technical scheme who adopts is mainly: the utility model discloses borrow for reference up-to-date bionics research achievement, at first adopt modeling and fluid simulation technique, design and the resistance reduction heat transfer effect of the bionical sharkskin structure of prediction. By means of ultra-precision machining, a template with a bionic complex microstructure is machined on the metal surface, a reasonable machining process and machining parameters are formulated to improve the cutting machining efficiency, and the drag reduction and high-efficiency heat exchanger equipment inner surface microstructure with high-precision surface quality and optimized morphological characteristics is obtained. In addition, to traditional sample that has functional structure and heat exchange equipment's the measurement and the aassessment of drag reduction characteristic and heat transfer efficiency more complicated and expensive always, the utility model discloses combine the characteristics experiment investigation of ultra-precision machining, a set of simple heat transfer and flow resistance detecting system of creative establishment.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a preferred embodiment of a multi-field synchronous measurement system of a heat exchanger according to the present invention.
As shown in fig. 1, in this embodiment, the heat exchanger multi-field synchronous measurement system includes a circulating water tunnel experiment platform, a temperature change image speed measurement subsystem, and a pressure measurement subsystem.
Wherein, circulation water tunnel experiment platform includes heat exchanger 1, water tank 2, immersible pump 3, electromagnetic flowmeter 4 and converter 5, and the temperature variation image speed measurement subsystem includes thermocouple 6, heat source 7, PLC controller 8, and the pressure measurement subsystem includes pressure sensor 9.
The heat exchanger 1 comprises a heat exchanger body 101 and a base 102 detachably connected with the heat exchanger body 101, and the base 102 and the heat exchanger body 101 are detachably connected, so that the fluid action effect of different microstructure surfaces can be flexibly and conveniently monitored.
The heat exchanger body 101 and the base 102 are sealed to form a heat exchange cavity, the base 102 is provided with a microstructure, and the thermocouple 6 and the heat source 7 are fixed on the base 102.
In the embodiment, the heat source 7 is used for heating the base 102 of the heat exchanger 1, the frequency converter 5 and the submersible pump 3 are used for enabling water to stably flow in the heat exchange cavity when the thermocouple 6 detects that the temperature of the base 102 rises to a stable value, and the electromagnetic flowmeter 4 is used for detecting the flow rate of the water;
the thermocouple 6 is used for acquiring temperature data of the base 102 within a preset time period according to a preset acquisition frequency, and the pressure sensor 9 is used for synchronously acquiring pressure data between one end and the other end of the heat exchanger 1 within the preset time period according to the preset acquisition frequency.
The PLC 8 is used for analyzing the temperature data of the thermocouple 6 to obtain the heat transfer coefficient of the base 102 when the temperature detected by the thermocouple 6 does not drop any more and reaches a stable state, and analyzing the pressure data synchronously acquired by the pressure sensor 9 and the flow rate of the water detected by the electromagnetic flowmeter 4 to obtain the drag reduction coefficient of the base 102.
The PLC 8 is also used for obtaining the slope of a temperature drop curve according to the temperature data of the thermocouple 6 and obtaining the heat transfer coefficient of the base 102 according to the slope of the temperature drop curve.
The PLC controller 8 is further configured to obtain a current and voltage variation value of the submersible pump 3, calculate a power value of the submersible pump 3 according to the current and voltage variation value, and obtain a drag reduction coefficient of the base 102 according to the pressure data synchronously acquired by the pressure sensor 9, the flow rate of the water detected by the electromagnetic flowmeter 4, and the power value of the submersible pump 3, where an ammeter for measuring a current of the submersible pump 3 may be disposed between the submersible pump 3 and the PLC controller 8.
It can be understood that, in the present embodiment, the submersible pump 3 and one end of the heat exchanger body 101, and the water tank 2 and the other end of the heat exchanger body 101 may be connected by the PVC water pipe 10. Data signals acquired by the thermocouple 6, the electromagnetic flowmeter 4 and the pressure sensor 9 can be transmitted to the PLC 8 through the signal conditioner and the data acquisition card, and when the water pump switch is triggered, the data acquisition card is controlled to acquire data. Therefore, synchronous observation and measurement of the flow field on the surface of the microstructure by various experimental measurement equipment are realized, and finally, comprehensive research on the complex flow phenomenon of multi-field coupling, namely flow field resistance and heat transfer, is realized.
Further, in this embodiment, the heat exchanger multi-field synchronous measurement system further includes a heat dissipation fan, the heat dissipation fan is connected between the submersible pump 3 and the heat exchanger body 101, and the heat dissipation fan can be installed on the PVC water pipe 10 to dissipate heat from the PVC water pipe 10, so as to keep the water temperature in the water temperature water pipe 10 constant.
Further, in this embodiment, the heat exchanger multi-field synchronous measurement system further includes a temperature sensor 11, the temperature sensor 11 is connected between the electromagnetic flow meter 4 and the other end of the heat exchanger body 101, and the temperature sensor 11 is further connected with the PLC controller 8. The temperature sensor 11 is used for detecting the temperature of the PVC water pipe 10.
Further, in this embodiment, the heat exchanger multi-field synchronous measurement system further includes a display screen 12 connected to the PLC controller 8, so as to present the measurement result of the microstructure surface flow field to a user.
In addition, it is worth mentioning that in the present embodiment, one end and the other end of the heat exchanger body 101 are in a gradually flared or gradually tapered shape, so that the flow of water in the heat exchange cavity can be uniform and stable.
The working flow of the multi-field synchronous measurement system of the heat exchanger is further explained below.
Firstly, a heat source is turned on to heat a base of a heat exchanger, meanwhile, a thermocouple sensor detects the temperature of the base, when the temperature rises to a stable value, a submersible pump is turned on, and flowing parameters are adjusted to enable water to flow stably in a heat exchange cavity; then respectively starting the temperature image speed measuring subsystem and the pressure measuring subsystem, and respectively setting the acquisition frequency and the acquisition time length of the temperature image speed measuring subsystem and the pressure measuring subsystem; then, enabling the temperature image speed measuring subsystem and the pressure measuring subsystem to be in a waiting triggering state; and finally, when the temperature detected by the thermocouple does not drop any more and reaches a stable state, analyzing the multi-field synchronous acquired data through the PLC, and finishing the experiment after the steps are finished.
It will be appreciated that the effect on the fluid flow regime of the structured surface is necessarily different for different microstructures. The utility model discloses carry out the concrete mode of analysis to many synchronous acquisition data as follows:
1. for analysis of the temperature field, this data is derived from data collected by the thermocouple. When the base with the microstructure is heated to a certain temperature by the heat source, a water pump switch of the submersible pump is turned on, circulating water starts to flow on the surface of the microstructure of the base, the temperature of the base continuously drops along with the circulating water, and finally a stable value is reached. For different microstructures, the slope of the curve of temperature drop is different due to different heat transfer effects, and the corresponding stable temperature values are different after the temperature is not dropped any more. Analyzing the descending rules of different temperature curves is an important basis for judging the heat transfer performance.
2. For the analysis of the flow resistance field, the data is obtained from the data collected by an energy measuring instrument (measuring the voltage and current changes of the water pump), a pressure sensor and an electromagnetic flowmeter. The different microstructures differ in drag reduction properties of the fluid. There are two experimental test methods for the analysis of the flow resistance field in this example: firstly, keeping the same fluid flow speed, replacing different microstructure bases, and collecting pressure change data (measured by a pressure sensor) at two ends of a heat exchanger body; and secondly, keeping the pressure difference between the two sides of the heat exchanger body unchanged, and replacing the microstructure base to collect data (measured by the electromagnetic flowmeter) of the flow velocity change. And then, the laboratory is made, the current and voltage change values of the water pump are collected at the same time, and the power value is calculated through a formula. Through the change of the pressure difference, the change of the flow velocity is matched with the change of the power of the water pump, and the micro-structure surface with better drag reduction effect can be analyzed.
The utility model discloses many field synchronous measurement system of heat exchanger's beneficial effect is:
1. the utility model can greatly reduce the cost for constructing the experiment platform by constructing the small-sized circulating water tunnel experiment platform, realize the miniaturization of constructing the water tunnel and the improvement of the measurement precision, and has simple operation and unlimited site;
2. for a small water circulation system, the size of the sample to be measured can be greatly reduced, and although the resistance characteristic formed by the fluid flowing through the sample at one time is not obvious, the effect can be amplified continuously through circulation accumulation. Therefore, the size of the sample needing to be processed and prepared can be greatly reduced, so that the processing production cost and the testing cost are reduced.
3. The utility model discloses built the temperature variation image speed measurement subsystem, not only can measure fluidic resistance field, also can measure the temperature field simultaneously, realized the effect of the many field measurements of a system.
The above is only the preferred embodiment of the present invention, and the patent scope of the present invention is not limited thereby, and all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings of the present invention or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (5)
1. A heat exchanger multi-field synchronous measurement system is characterized by comprising a circulating water tunnel experiment platform, a temperature change image speed measurement subsystem and a pressure measurement subsystem;
the circulating water tunnel experiment platform comprises a heat exchanger, a water tank, a submersible pump, an electromagnetic flowmeter and a frequency converter, the temperature change image speed measurement subsystem comprises a thermocouple, a heat source and a PLC (programmable logic controller), and the pressure measurement subsystem comprises a pressure sensor;
the heat exchanger comprises a heat exchanger body and a base detachably connected with the heat exchanger body, the heat exchanger body and the base are sealed to form a heat exchange cavity, a microstructure is arranged on the base, and the thermocouple and the heat source are fixed on the base;
the submersible pump is located in the water tank, the submersible pump is connected with one end of the heat exchanger body, the other end of the heat exchanger body is connected with the water tank, the electromagnetic flow meter is sequentially connected between the other end of the heat exchanger body and the water tank, the thermocouple, the electromagnetic flow meter and the frequency converter are respectively connected with the PLC, and the frequency converter is further connected with the submersible pump.
2. The heat exchanger multi-field synchronous measurement system according to claim 1, further comprising a heat dissipation fan connected between the submersible pump and the heat exchanger body.
3. The heat exchanger multi-field synchronous measurement system according to claim 1, further comprising a temperature sensor connected between the electromagnetic flow meter and the other end of the heat exchanger body, the temperature sensor being further connected with the PLC controller.
4. The heat exchanger multi-field synchronous measurement system according to claim 1, further comprising a display screen connected with the PLC controller.
5. The heat exchanger multi-field synchronous measurement system according to claim 1, wherein one end and the other end of the heat exchanger body are in a shape of a gradually flared opening or a gradually tapered opening.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112504719A (en) * | 2020-12-28 | 2021-03-16 | 成都成发泰达航空科技有限公司 | Comprehensive detection system for aviation heat exchanger |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112504719A (en) * | 2020-12-28 | 2021-03-16 | 成都成发泰达航空科技有限公司 | Comprehensive detection system for aviation heat exchanger |
| CN112504719B (en) * | 2020-12-28 | 2021-09-14 | 成都成发泰达航空科技有限公司 | Comprehensive detection system for aviation heat exchanger |
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