A plate-fin heat exchanger test device and test method

Abstract

The present invention belongs to the technical field of heat exchanger test experimental equipment, and discloses a plate-fin heat exchanger test experimental device and test method, the device includes a controller and a high-pressure gas source part, a cooling part, a front-end regulating valve group, a first data acquisition part, an experimental specimen part, a second data acquisition part and a rear-end regulating valve group connected in sequence through pipelines; wherein, it also includes a heat exchange flow stock part connected to the experimental specimen part, providing heat exchange flow stocks for the experimental specimen part; the front-end regulating valve group and the rear-end regulating valve group respectively include at least three regulating valves arranged in parallel; the controller is connected to the first data acquisition part, the second data acquisition part, the front-end regulating valve group and the rear-end regulating valve group. The device and method are positive pressure wind tunnel type experimental devices, which can provide a large range of working conditions for the heat exchanger. Multiple regulating valves are linked and controlled, with good stability, can meet the stable test of high flow conditions, and are suitable for testing plate-fin heat exchangers.

Description

Technical Field

[0001] The invention belongs to the technical field of heat exchanger test experimental equipment, and in particular relates to a plate-fin heat exchanger test experimental device and a test method. Background Art

[0002] Plate-fin heat exchangers are a type of compact heat exchangers with high specific surface area, large number of heat transfer units and efficient heat transfer characteristics. A large number of tests have shown that at the same flow rate, the heat transfer performance of plate-fin heat exchangers is 3 to 5 times higher than that of tube-fin heat exchangers. At the same resistance loss, the heat transferred by plate-fin heat exchangers is 6 to 7 times that of tube-fin heat exchangers, and the floor space can be saved by 3 to 5 times.

[0003] In the design of heat exchangers, the basic heat transfer and flow resistance data available with sufficient accuracy are mainly for the flow in round tubes and around round tube bundles. However, plate-fin heat exchangers are widely used in industrial sectors such as petrochemicals, aviation, vehicles, power machinery, air separation, deep cryogenic fields, atomic energy and aerospace. In these applications, the size and weight of the plate-fin heat exchanger directly affect the final size of the entire equipment and the performance of the corresponding equipment. Therefore, in addition to excellent heat transfer flow resistance performance, the plate-fin heat exchanger also needs to be small in size and light in weight. For this reason, people have developed efficient and compact plate-fin heat exchangers, whose heat transfer characteristics are better than those of round tube bundles. However, due to the lack of basic heat transfer and flow resistance data, its application has been limited for a long time. The experimental heat transfer data and flow resistance data of compact plate-fin heat exchangers are difficult to measure accurately, which has become an important factor restricting its development.

[0004] The heat transfer process of the plate-fin heat exchanger is mainly completed through the heat conduction of the fins, and the convection or phase change heat transfer between the fins and the fluid. Obtaining the relationship between the dimensionless heat transfer factor j and the flow resistance factor f of the fin and the Reynolds number Re is of great significance for guiding and improving the design of the heat exchanger and reducing the design margin. At the same time, these basic data are also the basis for developing new fins, reducing the weight of plate-fin heat exchangers, and improving product competitiveness.

[0005] The plate-fin heat exchanger performance test platform is a relatively complex test system, which needs to consider the wind tunnel form, test range, control and data acquisition and analysis. Among them, the wind tunnel form refers to the pressure state in the test piece channel, which can be divided into positive pressure test platform and negative pressure test platform according to the wind tunnel form. The existing negative pressure test platform has the advantage of high stability, but cannot provide a large enough test range; the positive pressure test platform can provide a large enough test range, but there are problems of difficult control and poor stability, especially under high flow conditions, the system stability is worse. Therefore, it is difficult for the existing plate-fin heat exchanger performance test platform to obtain accurate performance parameters of the plate-fin heat exchanger under a larger range of operating conditions, which restricts the development and application of plate-fin heat exchangers. Summary of the invention

[0006] In view of the problems existing in the above-mentioned prior art, the present invention provides a plate-fin heat exchanger testing experimental device and a testing method. The device and method are positive pressure wind tunnel type experimental devices, which can provide a large range of operating conditions for the heat exchanger. Through the linkage control of multiple regulating valves, it has good stability and can meet the stable testing of high flow conditions. It is suitable for the testing of plate-fin heat exchangers.

[0007] The technical solution adopted by the present invention is as follows:

[0008] A plate-fin heat exchanger test experimental device, comprising a controller and a high-pressure gas source part, a cooling part, a front-end regulating valve group, a first data acquisition part, an experimental specimen part, a second data acquisition part and a rear-end regulating valve group connected in sequence through pipelines;

[0009] Among them, it also includes a heat exchange flow stream part connected to the experimental specimen part, providing heat exchange flow streams for the experimental specimen part;

[0010] The front-end regulating valve group and the rear-end regulating valve group respectively include at least three regulating valves arranged in parallel;

[0011] The controller is connected to the first data acquisition unit, the second data acquisition unit, the front-end regulating valve group and the rear-end regulating valve group.

[0012] In one embodiment of the present application, the high-pressure gas source unit includes a plurality of air compressor units arranged in parallel, and the air compressor units are connected to the controller;

[0013] And / or, the cooling part includes a heat exchanger connected to the outlet end of the high-pressure gas source part and a cooling water tower connected to the heat exchanger, and a first flow regulating valve and a first temperature detector are provided between the heat exchanger and the cooling water tower, and the first flow regulating valve and the first temperature detector are both connected to the controller.

[0014] In one embodiment of the present application, a buffer tank is further connected between the front-end regulating valve group and the experimental specimen part, and the outlet end of each regulating valve in the front-end regulating valve group is connected to the buffer tank.

[0015] In one embodiment of the present application, a first pressure detector is provided on the buffer tank, and the first pressure detector is connected to the controller and associated with the front-end regulating valve group.

[0016] In one embodiment of the present application, a flow meter is further provided on the pipeline between the buffer tank and the first data acquisition unit, and the flow meter is connected to the controller and associated with the rear-end regulating valve group.

[0017] In one embodiment of the present application, the front-end regulating valve group and the rear-end regulating valve group each include three regulating valves with different calibers;

[0018] And / or, the first data acquisition unit and the second data acquisition unit both include a first flow detector, a second pressure detector and a second temperature detector.

[0019] In one embodiment of the present application, the outlet end of the heat exchange stream section is connected in series with a second flow regulating valve and a third data acquisition unit, the inlet end of the heat exchange stream section is connected in series with a fourth data acquisition unit and a third flow regulating valve, and the second flow regulating valve, the third data acquisition unit, the fourth data acquisition unit and the third flow regulating valve are all connected to the controller;

[0020] The third data acquisition unit and the fourth data acquisition unit both include a third temperature detector and a second flow detector.

[0021] In one embodiment of the present application, the maximum test condition Reynolds number Re of the experimental device is greater than 30,000, and the average maximum test condition Reynolds number Re is greater than 15,000.

[0022] A plate-fin heat exchanger testing method, using the plate-fin heat exchanger testing experimental device as described in any one of the above, comprises the following steps:

[0023] S1, open the high-pressure gas source to pressurize the plate-fin heat exchanger test experimental device to reach the target pressure;

[0024] S2, slowly adjust the front-end regulating valve group and the rear-end regulating valve group to make the air flow through the test specimen reach the target flow, and then start the automatic adjustment program to control the air flow to stabilize to the working condition requirements;

[0025] S3, after the air flow is stable, the flow rate and temperature of the heat exchange stream are adjusted so that the air flow exchanges heat with the heat exchange stream in the experimental specimen and remains stable for a certain period of time;

[0026] S4, after stabilization for a certain period of time, collect, record and calculate the test data to obtain the performance parameters of the experimental specimen.

[0027] In one embodiment of the present application, in step S1, part of the high-pressure gas source is opened to pre-pressurize the experimental device and detect the sealing of the experimental device. After the sealing test is qualified, the remaining part or all of the high-pressure gas source is opened to pressurize the experimental device so that the air flow channel of the experimental device reaches the target pressure;

[0028] and / or, when collecting and recording the test data in step S4, the test pressure fluctuation in the experimental device is less than 0.25% and less than 1 kPa;

[0029] And / or, it also includes step S5, after completing the data collection of one working condition, adjusting the front-end regulating valve group and the rear-end regulating valve group, adjusting the air flow flowing through the experimental specimen to the next target flow, and through the automatic adjustment program, controlling the air flow to be stable to the next working condition requirement, and then repeating the operations of steps S3~S4 to complete the test of the experimental specimen.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The plate-fin heat exchanger test experimental device and test method of the present invention are provided with a high-pressure gas source part at the front end of the device, adopt a positive pressure wind tunnel type design, and are provided with a front end regulating valve group, a rear end regulating valve group and a first data acquisition part, and a second data acquisition part. The front end regulating valve group and the rear end regulating valve group respectively adjust the airflow through at least three regulating valves arranged in parallel, and are linked in real time with the data collected by the first data acquisition part and the second data acquisition part. When the data in the test area fluctuates slightly, the regulating valve group can be fine-tuned in real time, so that the device can meet the test requirements of a larger working condition range, and can ensure the stability of the test process and the accuracy and reliability of the results.

[0032] 2. The plate-fin heat exchanger test experimental device and test method of the present invention, by setting a buffer tank, a high-pressure air source part and setting multiple air compressor units in parallel, etc., make the experimental device can well meet the needs of a very large test range, and the airflow can remain stable for a long time during the test. The maximum working condition of the experimental device for testing the experimental piece can reach a Reynolds number Re30000 or more, and the average of the maximum working condition can reach Re15000 and above. Under the turbulent conditions of ultra-large flow and ultra-large Re, the test pressure fluctuation of the experimental device is below 1kPa, and the pressure fluctuation does not exceed 0.25% relative to the test condition; in addition, the experimental device and the test method are fast to adjust, and can quickly reach stability after changing the flow condition (stability can be achieved within 5 minutes), and the stable state of each condition can theoretically be extended indefinitely.

[0033] 3. The device of the present invention overcomes the problem of small test range (maximum operating Reynolds number Re < 8000) of the same type of negative pressure test platform, and solves the problems of poor stability and inaccurate test results when suitable for ultra-large test range. The device has high stability and accuracy, and can accurately obtain the flow resistance characteristics (resistance factor f) and heat transfer performance (heat transfer factor j) of various fin forms of plate-fin heat exchangers, and finally obtain the heat transfer factor j and resistance factor f required for the design of plate-fin heat exchangers, which can be used to establish a database under various fin types and processing technologies for the development and application of plate-fin heat exchangers. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 It is a structural schematic diagram of the plate-fin heat exchanger test experimental device of the present invention.

[0036] Figure 2 It is a schematic diagram of the front structure of an experimental specimen in the present invention.

[0037] Figure 3 It is a schematic diagram of the side structure of an experimental specimen in the present invention.

[0038] Figure 4 It is a schematic diagram of the flow chart of the plate-fin heat exchanger testing method of the present invention.

[0039] Reference numerals:

[0040] 1. High pressure gas source;

[0041] 2. Cooling unit; 21. Heat exchanger; 22. Cooling tower;

[0042] 3. Front end regulating valve group;

[0043] 4. The first data collection unit;

[0044] 5. Experimental specimen department;

[0045] 6. Second data collection unit;

[0046] 7. Rear end regulating valve group; 71. Muffler;

[0047] 8. Heat exchange stream section;

[0048] 9. Buffer tank; 91. First pressure detector; 92. Flow meter. DETAILED DESCRIPTION

[0049] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0050] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "inside", "outside", "middle" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships conventionally placed when the product of the present invention is used, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0051] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention.

[0054] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0055] The embodiment of the present invention provides a plate-fin heat exchanger test experimental device and a test method, such as Figure 1 As shown, the plate-fin heat exchanger test experimental device includes a controller (not shown in the figure) and a high-pressure gas source part 1, a cooling part 2, a front-end regulating valve group 3, a first data acquisition part 4, an experimental specimen part 5, a second data acquisition part 6 and a rear-end regulating valve group 7 which are connected in sequence through pipelines.

[0056] The experimental specimen part 5 is used to install the experimental specimen to be tested (such as a plate-fin heat exchanger element); and also includes a heat exchange stream part 8 connected to the experimental specimen part 5, and the heat exchange stream part 8 is used to provide heat exchange streams for the experimental specimen part 5, and the heat exchange streams exchange heat with the air flow in the experimental specimen to be tested. Usually, the heat exchange stream part 8 provides high-temperature heat exchange streams, and the high-temperature heat exchange streams are mostly high-temperature water.

[0057] The front-end regulating valve group 3 and the rear-end regulating valve group respectively include at least three regulating valves arranged in parallel.

[0058] The controller is connected to the first data acquisition unit 4, the second data acquisition unit 6, the front-end regulating valve group 3 and the rear-end regulating valve group 7, etc., and can collect, record, store and calculate data, and perform linkage control on the front-end regulating valve group 3 and the rear-end regulating valve group 7.

[0059] A silencer 71 is arranged at the outlet of the rear regulating valve group 7. The high-pressure air flow for testing passes through the silencer 71 to be silenced and discharged into the atmosphere, with low noise and no pollution to the environment.

[0060] like Figure 2 and Figure 3 As shown, the experimental specimen part 5 can be detachably installed with various different types of experimental specimens to meet the testing requirements of various experimental specimens. All connection parts in the experimental device are connected by flange bolt connection structure, and various soft connection methods are abandoned to ensure that the requirements of higher pressure of the test condition are met, which is safer and more reliable. Figure 2 and Figure 3 In the experimental specimen shown, the middle front part / the middle left and right parts are the inlet and outlet of the air flow, which are sealed and connected to the experimental specimen part 5 or the pipeline through flanges; the upper and lower parts are the inlet and outlet of the heat exchange flow, which are also sealed and connected to the experimental specimen part 5 or the pipeline through flanges.

[0061] Preferably, the high-pressure gas source unit 1 is composed of multiple air compressor units connected in parallel, and each air compressor unit is connected to a controller, and the controller controls the switch and operation size. The high-pressure gas source unit 1 is configured as multiple air compressor units connected in parallel, which can well meet the requirements of a wider range of pressure airflow test conditions.

[0062] The cooling unit 2 includes a heat exchanger 21 and a cooling water tower 22 connected to each other, wherein the heat exchanger 21 is connected to the outlet end of the high-pressure gas source unit 1 to cool the high-temperature high-pressure air compressed by the high-pressure gas source unit 1 .

[0063] Preferably, a first flow regulating valve (not shown in the figure) and a first temperature detector (not shown in the figure) are provided on the pipeline between the heat exchanger 21 and the cooling tower 22, and the first temperature detector and the first flow regulating valve are both connected to the controller. The controller can collect and record the detected temperature data and control the switch and flow size of the first flow regulating valve, so as to automatically control and accurately adjust the high-pressure air to a desired temperature.

[0064] Preferably, the front-end regulating valve group 3 and the rear-end regulating valve group 7 each include three regulating valves arranged in parallel, and the calibers of the three regulating valves arranged in parallel are all different, and are determined according to the maximum and minimum gas flow rates, and are divided into three levels from small to large. The three regulating valves with different calibers are arranged in parallel for flow regulation, and can be combined and adjusted in a variety of operating modes, can adapt to the requirements of a wider range of air flow test conditions, and have high regulation accuracy, and can achieve precise regulation within the control range; in conjunction with multiple air compressor units arranged in parallel, it can better meet the stable test of the positive pressure super-large test range (pressure and flow). The front-end regulating valve group 3 and the rear-end regulating valve group 7 use three regulating valves with different calibers arranged in parallel, which can well meet the requirements of the test condition range, ensure the stability of regulation, and the control program design is simpler and the equipment investment is lower. Of course, the front-end regulating valve group 3 and the rear-end regulating valve group 7 can also use more than three regulating valves arranged in parallel, but it will increase the control difficulty and equipment cost.

[0065] The maximum test condition Reynolds number Re of the experimental device can reach more than 30000, and the average maximum test condition Reynolds number Re can reach more than 15000. Preferably, the regulating valves in the front regulating valve group 3 and the rear regulating valve group 7 are pneumatic regulating valves.

[0066] In one embodiment, a buffer tank 9 is further connected between the front-end regulating valve group 3 and the experimental specimen part 5, and the outlet end of each regulating valve in the front-end regulating valve group 3 is connected to the buffer tank 9; that is, the airflow regulated by the front-end regulating valve group 3 directly enters the buffer tank 9, and the airflow required for subsequent tests is then led out of the buffer tank 9 through a pipeline, thereby ensuring the stability of the airflow and preventing the airflow entering the experimental specimen part 5 from being affected by the regulation of the regulating valve and causing large fluctuations.

[0067] Furthermore, a first pressure detector 91 is provided on the buffer tank 9, and the first pressure detector 91 is connected to the controller. The controller can collect, record, store and calculate the data collected by the first pressure detector 91, and associate the data detected by the first pressure detector 91 with the front-end regulating valve group 3, so as to further coordinate the control of the front-end regulating valve group 3, realize fine-tuning correction, and further improve the stability of the test airflow pressure when the front-end regulating valve group 3 and the rear-end regulating valve group 7 are linked.

[0068] A flow meter 92 is also provided on the pipeline between the outlet of the buffer tank 9 and the first data acquisition unit 4. The flow meter 92 is connected to the controller. The controller can collect, record, store and calculate the data collected by the flow meter 92, and associate the data detected by the flow meter 92 with the rear-end regulating valve group 7, so as to coordinate the rear-end regulating valve group 7 with the other collected data to achieve fine-tuning correction. When the front-end regulating valve group 3 and the rear-end regulating valve group 7 are linked, the stability of the test airflow flow is further improved.

[0069] Pressure and flow are related and corresponding parameters. Pressure fluctuations are bound to cause flow fluctuations, and flow fluctuations caused by pressure fluctuations will have a certain hysteresis. By setting a first pressure detector 91 on the front buffer tank 9 and associating it with the front regulating valve group 3, and setting a flow meter 92 after the buffer tank 9 and before the first data acquisition unit 4 and associating it with the rear regulating valve group 7, it is possible to better achieve fine-tuning of the test airflow, ensure the stability of the test airflow entering the experimental specimen unit 5, and ensure that the first data acquisition unit 4 and the second data acquisition unit 6 collect accurate and reliable data, thereby ensuring the stability and accuracy of the test results.

[0070] By setting the buffer tank 9, the first pressure detector 91, the flow meter 92, etc. in association with the front-end regulating valve group 3 and the rear-end regulating valve group 7, linkage control and real-time fine-tuning are realized, so that the test airflow flowing through the experimental specimen part 5 can achieve long-term stability, and even in the turbulent state of ultra-large flow and ultra-large Reynolds number Re, the pressure fluctuation can be controlled below 1kPa; and relative to the test condition, the pressure fluctuation can be controlled below 0.25% (and the flow fluctuation caused by pressure fluctuation has a fluctuation range smaller than the pressure fluctuation range, so the flow fluctuation of the test airflow flowing through the experimental specimen part 5 is smaller). In addition, in conjunction with multiple air compressor units arranged in parallel and regulating valve groups of different calibers arranged in parallel, after changing the flow condition, the experimental device can quickly adjust to meet the requirements of the required test condition and achieve stability (the time required to change the flow and achieve stability is usually within 5 minutes), and the time to maintain stability of each condition can theoretically be extended indefinitely.

[0071] The first data acquisition unit 4 is arranged at the airflow inlet end of the experimental specimen unit 5, and the second data acquisition unit 6 is arranged at the airflow outlet end of the experimental specimen unit 5. The first data acquisition unit 4 and the second data acquisition unit 6 both include a first flow detector, a second pressure detector and a second temperature detector, which are used to collect the flow, pressure and temperature of the airflow entering and flowing out of the experimental specimen unit 5 in real time.

[0072] Correspondingly, the outlet end of the heat exchange stream section 8 is provided with a second flow regulating valve (not shown in the figure) and a third data acquisition unit (not shown in the figure), and the inlet end of the heat exchange stream section 8 is provided with a fourth data acquisition unit (not shown in the figure) and a third flow regulating valve (not shown in the figure). The second flow regulating valve, the third data acquisition unit, the fourth data acquisition unit and the third flow regulating valve are all connected to the controller, which collects, records, stores and calculates the corresponding data, and controls the switch and flow size of the second flow regulating valve and the third flow regulating valve. The third data acquisition unit and the fourth data acquisition unit both include a third temperature detector and a second flow detector, and the third data acquisition unit and the fourth data acquisition unit are arranged near the inlet and outlet of the heat exchange stream channel of the experimental specimen section 5, which can accurately collect the temperature and flow parameters of the heat exchange streams entering and leaving the experimental specimen section 5 in real time, ensuring the accuracy of the calculation test results and the accuracy of the control adjustment.

[0073] The above-mentioned collected and recorded data are recorded and analyzed by the controller. On the one hand, they are used for the calculation and processing of the test results (mainly involving the data collected by the first data acquisition unit 4, the second data acquisition unit 6, the third data acquisition unit and the fourth data acquisition unit) to obtain the performance parameters of the experimental specimen (such as obtaining the heat transfer factor j, the resistance factor f, etc.); on the other hand, they serve the regulation of the six regulating valves in the front-end regulating valve group 3 and the rear-end regulating valve group 7, as well as the regulation of the first flow regulating valve, the second flow regulating valve, the third flow regulating valve, etc. That is, the automatic stable control of the entire experimental device system is realized through the controller.

[0074] Based on the same inventive concept, the embodiment of the present invention also provides a plate-fin heat exchanger testing method, such as Figure 4 As shown, the plate-fin heat exchanger test method is based on the above-mentioned plate-fin heat exchanger test experimental device and includes the following steps:

[0075] S1, open the high-pressure air source part 1 to pressurize the plate-fin heat exchanger test experimental device so that the air flow in the plate-fin heat exchanger test experimental device reaches a preset target pressure.

[0076] S2, then slowly adjust the front-end regulating valve group 3 and the rear-end regulating valve group 7 to make the air flow through the experimental specimen part 5 reach the target flow, and then start the automatic adjustment program in the controller for fine-tuning to control the air flow (including pressure and flow) to stabilize to the required test conditions.

[0077] S3, after the air flow is stable, the flow rate and temperature of the heat exchange stream are adjusted to the test condition requirements, so that the air flow exchanges heat with the heat exchange stream in the experimental specimen in the experimental specimen part 5 and remains stable for a certain period of time.

[0078] Specifically, the pressure, flow rate and temperature of the air flow are kept stable, as well as the temperature and flow rate of the heat exchange stream, etc. Subsequent tests are usually performed after maintaining stability for 30 minutes or more.

[0079] S4, after being stable for a certain period of time, collect, record and calculate the test data to obtain the performance parameters of the experimental specimen. Specifically, the test data includes the temperature, pressure and flow data of the air flow entering and leaving the experimental specimen part 5, and the temperature and flow data of the heat exchange flow entering and leaving the experimental specimen part 5.

[0080] Preferably, in step S1, a part of the high-pressure gas source part 1 is first opened, such as a parallel air compressor unit, to pre-pressurize the experimental device, and various parts of the air flow path of the experimental device are leak-checked, that is, the sealing of the experimental device is tested; after the sealing test is qualified, the remaining part or all of the high-pressure gas source part 1 is opened, that is, according to the test working condition requirements, the remaining part or all of the parallel air compressor units are opened to pressurize the experimental device so that the air flow path of the experimental device reaches the target pressure.

[0081] The high-pressure gas source part 1 adopts multiple air compressor units connected in parallel, which can not only meet the test range requirements of larger flow and pressure, but also only turn on some air compressor units during leak detection operations or low-flow and low-pressure test conditions to achieve low-energy operation and effectively save test costs.

[0082] In step S4, when collecting and recording the test data for each working condition, the fluctuation of the test pressure in the experimental device relative to the required pressure of the working condition is less than 0.25%, and less than 1 kPa, that is, the maximum fluctuation does not exceed 1 kPa. This fluctuation refers in particular to the pressure fluctuation at the inlet end of the experimental specimen part 5. Controlling the pressure fluctuation within this range can effectively ensure the accuracy of the test data.

[0083] Furthermore, the plate-fin heat exchanger test method also includes step S5. Step S5 is to adjust the front-end regulating valve group 3 and the rear-end regulating valve group 7 after completing the data collection of one working condition, adjust the air flow through the experimental specimen part 5 to the next target flow, and control the air flow to stabilize to the next working condition requirement through the automatic adjustment program, and then repeat the operations of the above steps S3 to S4 to obtain the performance parameters of the experimental specimen under the next working condition, and repeat this until the test of the experimental specimen is completed.

[0084] It should be noted that before the test experiment, a preparation step S0 is also included. Step S0 includes preheating the heat exchange stream 8 to prepare constant temperature water, and preparating a stable air source required by the pneumatic control valves in the front-end control valve group 3 and the rear-end control valve group 7 in advance.

[0085] After completing the test of the experimental specimen, stop the experiment, turn off the heating system and power system of the heat exchange flow section 8; turn off the air compressor unit of the high-pressure air source section 1, and slowly exhaust the high-pressure air in the experimental device until the entire device is depressurized; turn off the data acquisition section and each detector, and turn off the remaining powered modules, etc.

Claims

1. A plate-fin heat exchanger test experimental device, characterized in that: It comprises a controller and a high-pressure gas source unit (1), a cooling unit (2), a front-end regulating valve group (3), a first data acquisition unit (4), an experimental specimen unit (5), a second data acquisition unit (6) and a rear-end regulating valve group (7) which are sequentially connected via pipelines; It also includes a heat exchange flow section (8) connected to the experimental specimen section (5) to provide a heat exchange flow section for the experimental specimen section (5); The front-end regulating valve group (3) and the rear-end regulating valve group (7) respectively include three regulating valves arranged in parallel, and the calibers of the three regulating valves arranged in parallel are all different; The controller is connected to the first data acquisition unit (4), the second data acquisition unit (6), the front-end regulating valve group (3) and the rear-end regulating valve group (7); The high-pressure gas source unit (1) comprises a plurality of air compressor units arranged in parallel, and the air compressor units are connected to the controller; A buffer tank (9) is also connected between the front-end regulating valve group (3) and the experimental specimen part (5), and the outlet end of each regulating valve in the front-end regulating valve group (3) is connected to the buffer tank (9); The buffer tank (9) is provided with a first pressure detector (91), the first pressure detector (91) is connected to the controller and is associated with the front-end regulating valve group (3); A flow meter (92) is also provided on the pipeline between the buffer tank (9) and the first data acquisition unit (4); the flow meter (92) is connected to the controller and is associated with the rear-end regulating valve group (7).

2. The plate-fin heat exchanger test experimental device according to claim 1, characterized in that: The cooling part (2) comprises a heat exchanger (21) connected to the outlet end of the high-pressure gas source part (1) and a cooling water tower (22) connected to the heat exchanger (21); a first flow regulating valve and a first temperature detector are provided between the heat exchanger (21) and the cooling water tower (22); and the first flow regulating valve and the first temperature detector are both connected to the controller.

3. The plate-fin heat exchanger test experimental device according to claim 1, characterized in that: The first data acquisition unit (4) and the second data acquisition unit (6) both comprise a first flow detector, a second pressure detector and a second temperature detector.

4. The plate-fin heat exchanger test experimental device according to claim 1, characterized in that: A second flow regulating valve and a third data acquisition unit are connected in series at the outlet end of the heat exchange stream section (8), a fourth data acquisition unit and a third flow regulating valve are connected in series at the inlet end of the heat exchange stream section (8), and the second flow regulating valve, the third data acquisition unit, the fourth data acquisition unit and the third flow regulating valve are all connected to the controller; The third data acquisition unit and the fourth data acquisition unit both include a third temperature detector and a second flow detector.

5. The plate-fin heat exchanger test experimental device according to claim 1, characterized in that: The maximum test condition Reynolds number Re of the experimental device is greater than 30000, and the average maximum test condition Reynolds number Re is greater than 15000.

6. A plate-fin heat exchanger testing method, characterized in that: The plate-fin heat exchanger test experimental device according to any one of claims 1 to 5 is used, comprising the following steps: S1, open the high-pressure gas source to pressurize the plate-fin heat exchanger test experimental device to reach the target pressure; S2, slowly adjust the front-end regulating valve group and the rear-end regulating valve group to make the air flow through the test specimen reach the target flow, and then start the automatic adjustment program to control the air flow to stabilize to the working condition requirements; S3, after the air flow is stable, the flow rate and temperature of the heat exchange stream are adjusted so that the air flow exchanges heat with the heat exchange stream in the experimental specimen and remains stable for a certain period of time; S4, after stabilization for a certain period of time, collect, record and calculate the test data to obtain the performance parameters of the experimental specimen.

7. The plate-fin heat exchanger testing method according to claim 6, characterized in that: In step S1, a part of the high-pressure gas source is opened to pre-pressurize the experimental device and detect the sealing of the experimental device. After the sealing test is qualified, the remaining part or all of the high-pressure gas source is opened to pressurize the experimental device so that the air flow channel of the experimental device reaches the target pressure; and / or, when collecting and recording the test data in step S4, the test pressure fluctuation in the experimental device is less than 0.25% and less than 1 kPa; And / or, it also includes step S5, after completing the data collection of one working condition, adjusting the front-end regulating valve group and the rear-end regulating valve group, adjusting the air flow flowing through the experimental specimen to the next target flow, and through the automatic adjustment program, controlling the air flow to be stable to the next working condition requirement, and then repeating the operations of steps S3~S4 to complete the test of the experimental specimen.

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