Critical flow venturi nozzle assembly and flow detection system

Abstract

The utility model provides a critical flow venturi nozzle assembly and a flow detection system, and the critical flow venturi nozzle assembly comprises a critical flow venturi nozzle distributor, a pneumatic flow amplifier and a heater. The critical flow venturi nozzle distributor comprises a stagnation container, a collection container, a sonic nozzle, an air cylinder, a temperature detection device and a pressure detection device, an air inlet of the stagnation container is connected with an outlet of the pneumatic flow amplifier, the two ends of the sonic nozzle are located in the stagnation container and the collection container respectively, and the air cylinder is in driving connection with the sonic nozzle; the temperature detection device and the pressure detection device are communicated with the stagnation container and are used for detecting the gas temperature and the gas pressure in the stagnation container so as to calculate the flow of the gas to be detected; an inlet of the heater communicates with the air source assembly, and an outlet of the heater communicates with an inlet of the pneumatic flow amplifier. According to the critical flow venturi nozzle assembly and the flow detection system, the requirement for the detection environment can be lowered, and the reliability of the detection result is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flow detection equipment, in particular to a critical flow Venturi nozzle assembly and a flow detection system. BACKGROUND

[0002] In order to improve the working efficiency of an aero-engine and reduce the working temperature of turbine blades, high-pressure gas is introduced from a compressor to cool the inner cavity of the engine blade. However, excessive introduction of gas will reduce the working efficiency of the compressor. Therefore, the flow of cooling gas of the engine blade needs to be accurately controlled to ensure the working reliability and efficiency of the aero-engine.

[0003] At present, whether the engine blade meets the design requirements is detected by detecting the air flow in the inner cavity of the engine blade. The detection method applies a certain pressure at the inlet of the cooling gas flow in the inner cavity of the engine blade, measures the air flow at the inlet to obtain the flow detection result, and verifies the gas flow capacity of the inner cavity of the turbine blade. The inventors found that the existing technology at least has the following disadvantages in the process of implementing the present application: since the detection medium is air, the state of the air is easily changed, such as expansion when heated and compression when cooled. In order to meet the uniformity and reliability of the measurement data, a very strict detection environment is required, which is difficult to achieve or requires a very high cost, and there is a problem of inconvenient detection operation. SUMMARY

[0004] Therefore, the present application provides a critical flow Venturi nozzle assembly and a flow detection system to improve the problems of low reliability of detection results and high requirements for detection environment in the prior art.

[0005] To achieve the above-mentioned purpose, the technical scheme of the embodiments of the present application is as follows:

[0006] On the one hand, the present application provides a critical flow Venturi nozzle assembly for detecting the gas flow in the inner cavity of an engine blade, comprising a critical flow Venturi nozzle distributor, a pneumatic flow amplifier and a heater.

[0007] The critical flow Venturi nozzle distributor comprises a stagnation container, a collection container, a sonic nozzle, a cylinder, a temperature detection device and a pressure detection device, the gas inlet of the stagnation container is connected with the outlet of the pneumatic flow amplifier, the gas inlet end of the sonic nozzle is located in the stagnation container, the gas outlet end of the sonic nozzle is located in the collection container, the cylinder is drivingly connected with the sonic nozzle, the temperature detection device and the pressure detection device are respectively communicated with the stagnation container for detecting the gas temperature and the gas pressure in the stagnation container to calculate the gas flow to be detected; the inlet of the heater is communicated with the gas source assembly, and the outlet of the heater is communicated with the inlet of the pneumatic flow amplifier.

[0008] In one of the embodiments, the critical flow Venturi nozzle assembly further comprises a pressure regulator and a control valve, the control valve is arranged at the gas inlet end of the heater for controlling the on-off of the gas flow into the heater; the pressure regulator is arranged between the heater and the pneumatic flow amplifier for adjusting the pressure of the gas entering the critical flow Venturi nozzle distributor.

[0009] In one of the embodiments, the number of the critical flow Venturi nozzle distributors is more than two, all the critical flow Venturi nozzle distributors are respectively and parallelly connected, each of the critical flow Venturi nozzle distributors respectively comprises a plurality of the sonic nozzles, and each of the sonic nozzles is drivingly connected with a cylinder.

[0010] In one of the embodiments, the plurality of the sonic nozzles at least comprises two specifications, and the sonic nozzles of different specifications respectively have different gas flow range.

[0011] In another aspect, the embodiments of the present application provide a flow detection system, which comprises the critical flow Venturi nozzle assembly as described above, and further comprises a gas source assembly and a measurement machine;

[0012] The gas source assembly is used for providing compressed gas, and the gas outlet end of the gas source assembly is communicated with the gas inlet end of the critical flow Venturi nozzle assembly;

[0013] The measurement machine comprises a control assembly and a test bin, the control assembly is used for controlling each component of the flow detection system, the test bin is used for placing the engine blade to be detected, and the gas outlet of the collection container is used for being communicated with the inner cavity of the engine blade.

[0014] In one of the embodiments, the gas source assembly comprises an air compressor, a gas storage tank, a dryer and a pressure stabilizing tank which are sequentially connected through pipelines.

[0015] In one of the embodiments, the gas source assembly further comprises a coarse filter and a fine filter, the coarse filter being connected in series to the pipeline between the gas tank and the drier, and the fine filter being connected in series to the pipeline between the drier and the pressure stabilizer.

[0016] In one of the embodiments, the gas source assembly further comprises a cold drier, the gas inlet of the cold drier being connected to the gas outlet of the pressure stabilizer, and the gas outlet of the cold drier being connected to the gas inlet of the critical flow Venturi nozzle assembly.

[0017] In one of the embodiments, the control assembly comprises a control panel module and a controller, the control panel module being configured to perform control on the controller through operation and display the flow measurement results obtained by the controller on the control panel; and the controller being configured to receive and execute the operation instructions of the control panel module.

[0018] In one of the embodiments, the controller comprises a receiving unit and a calculation unit, the receiving unit being configured to receive the detection results of the temperature detection device and the pressure detection device and transmit the detection results to the calculation unit; the calculation unit being configured to automatically calculate the flow measurement results according to the received detection results; and the calculation unit being further configured to calculate the number and the number of the supersonic nozzles to be opened according to different detection requirements.

[0019] The critical flow Venturi nozzle assembly provided by the present application has the following advantages: the critical flow Venturi nozzle assembly provided by the present application provides the gas flowing into the engine blades through the critical flow Venturi nozzle distributor, when the supersonic nozzle reaches the critical state, the mass flow value of the gas flowing through the supersonic nozzle is a constant value, which has the advantages of high accuracy and good long-term stability, and can significantly improve the accuracy of flow measurement. In addition, the pneumatic flow amplifier and the heater are respectively arranged at the front end of the critical flow Venturi nozzle distributor, and the two devices can accurately control the flow and temperature of the gas entering the critical flow Venturi nozzle distributor, so that the gas reaches the preset parameter range required for detection, reduces the measurement error caused by the change of the state of the gas itself, improves the measurement accuracy, reduces the requirements for the measurement environment, facilitates the measurement operation, and reduces the cost required for measurement. The flow detection system provided by the present application comprises the critical flow Venturi nozzle assembly described above, and therefore also has the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 FIG. 1 is a structural schematic diagram of the critical flow Venturi nozzle assembly of the embodiment of the present application.

[0021] Figure 2 FIG. 4 is a schematic diagram of the external structure of the critical flow Venturi nozzle distributor of the embodiment of the present application.

[0022] Figure 3 Fig. 3 is a schematic diagram of the internal structure of the critical flow Venturi nozzle distributor of the embodiment of the present application (the outer shell of the stagnation container and the collection container are removed).

[0023] Figure 4 Fig. 4 is a schematic diagram of the structure of the air source assembly of the embodiment of the present application.

[0024] Figure 5 Fig. 5 is a schematic diagram of the structure of the measuring machine of the embodiment of the present application.

[0025] Figure 6 Fig. 6 is a schematic diagram of the assembly structure of the test chamber of the measuring machine and the critical flow Venturi nozzle assembly of the embodiment of the present application (the side plate of the test chamber and the side plate outside the critical flow Venturi nozzle assembly are removed).

[0026] The meanings of the respective reference numerals in the drawings are as follows:

[0027] 1. Critical flow Venturi nozzle assembly; 11. Critical flow Venturi nozzle distributor; 111. Temperature detection device; 112. Cylinder; 113. Stagnation container; 114. Pressure detection device; 115. Collection container; 116. Sonic nozzle; 12. Pneumatic flow amplifier; 13. Heater; 14. Pressure regulator; 15. Control valve;

[0028] 2. Air source assembly; 21. Air compressor; 22. Air storage tank; 23. Coarse filter; 24. Drier; 25. Fine filter; 26. Pressure stabilizing tank; 27. Cold dryer;

[0029] 3. Measuring machine; 31. Test chamber; 32. Control panel module. DETAILED DESCRIPTION

[0030] The technical solutions of the present application are further described in detail below in combination with the drawings and specific embodiments.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0032] In the description of the application, it needs to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In the description of the application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0033] In the description of the application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0034] Please refer to Figure 1 The critical flow Venturi nozzle assembly 1 of the embodiment of the application is used for detecting the gas flow in the inner cavity of the engine blade, which comprises a critical flow Venturi nozzle distributor 11, a pneumatic flow amplifier 12 and a heater 13.

[0035] As Figures 1 to 3 shown, the critical flow Venturi nozzle distributor 11 comprises a stagnation container 113, a collection container 115, a sonic nozzle 116, a cylinder 112, a temperature detection device 111 and a pressure detection device 114, the gas inlet of the stagnation container 113 is connected with the outlet of the pneumatic flow amplifier 12, the gas inlet end of the sonic nozzle 116 is located in the stagnation container 113, the gas outlet end of the sonic nozzle 116 is located in the collection container 115, the cylinder 112 is drivingly connected with the sonic nozzle 116, the temperature detection device 111 and the pressure detection device 114 are respectively communicated with the stagnation container 113, which are used for detecting the gas temperature (i.e. the stagnation temperature of the gas before the sonic nozzle) and the gas pressure (i.e. the stagnation pressure of the gas before the sonic nozzle) in the stagnation container 113, so as to calculate the gas flow to be detected. The inlet of the heater 13 is communicated with the gas source assembly 2, and the outlet of the heater 13 is communicated with the inlet of the pneumatic flow amplifier 12. When the sonic nozzle 116 reaches the critical state, the gas mass flow value through the sonic nozzle 116 is a constant value.

[0036] The temperature detection device 111 can be a temperature sensor, and the pressure detection device 114 can be a pressure sensor.

[0037] Specifically, in this embodiment, the critical flow venturi nozzle assembly 1 further includes a pressure regulator 14 and a control valve 15. The heater 13 in this embodiment can be, for example, an electric heater 13, used to heat the flowing gas to achieve precise temperature control under different requirements. The control valve 15 is located on the inlet pipe of the heater 13 and is used to control the flow of gas into the heater 13; this control valve 15 can be, for example, a pneumatic ball valve. The pressure regulator 14 is located between the heater 13 and the pneumatic flow amplifier 12, used to adjust the pressure of the gas entering the critical flow venturi nozzle distributor 11 according to actual needs, so that the gas exiting the pressure regulator 14 is output in a stable pressure state, reducing pressure fluctuations in the gas output.

[0038] In some embodiments, two or more critical flow Venturi nozzle distributors 11 may be provided, all of which are connected in parallel. For example, a three-way or multi-way assembly may be added after the pneumatic flow amplifier 12. For instance, the inlet of the three-way assembly is connected to the outlet of the pneumatic flow amplifier 12, and the outlet of the three-way assembly is connected to the inlet of the critical flow Venturi nozzle distributor 11. The outlet of the critical flow Venturi nozzle distributor 11 is used to communicate with the inner cavity of the engine blade to be measured (through a test chamber). Each critical flow Venturi nozzle distributor 11 includes multiple sonic nozzles 116, and each sonic nozzle 116 is driven by a cylinder 112. In this embodiment, each sonic nozzle 116 is individually controlled by a cylinder 112 to form various combinations of sonic nozzles 116, thereby meeting the different measurement requirements of gas flow of the engine blades to a wider range.

[0039] In some embodiments, each sonic nozzle 116 can be selected with a specific measurement range according to different user needs. For example, various specifications can be provided among these sonic nozzles 116, with different specifications of sonic nozzles 116 having different gas flow ranges. This allows the sonic nozzles 116 to be combined to create more flow ranges, making the applicable measurement range wider. For example, the flow range when two sonic nozzles 116 are combined is the sum of the flow ranges of the two sonic nozzles 116. The same principle applies to setting two or more critical flow Venturi nozzle distributors 11, which allows for more combination modes of measurement ranges and a wider applicable measurement range.

[0040] like Figure 4 and Figure 5 As shown in the embodiments of this application, a measurement and detection system is also provided, including the critical flow venturi nozzle assembly 1 in the above embodiments, as well as the gas source assembly 2 and the measuring machine 3.

[0041] The air source assembly 2 is used to provide compressed air, and the air outlet of the air source assembly 2 is in communication with the air inlet of the critical flow Venturi nozzle assembly 1.

[0042] The measuring machine 3 comprises a control assembly and a test chamber 31, the control assembly is used to control each component of the flow detection system, and the test chamber 31 is used to place the engine blade to be detected, such as Figure 6 As shown, the air outlet of the collection container 115 is connected to the air inlet of the test chamber 31 to realize communication with the inner cavity of the engine blade.

[0043] Specifically, as shown in Figure 4 The air source assembly 2 comprises an air compressor 21, an air tank 22, a coarse filter 23, a drying machine 24, a fine filter 25, a pressure stabilizing tank 26 and a cold drying machine 27 connected in sequence by pipelines. The air outlet of the cold drying machine 27 is connected to the air inlet of the critical flow Venturi nozzle assembly 1.

[0044] As shown in Figure 5 The control assembly comprises a control screen module 32 and a controller (not shown), the control screen module 32 is used to control the controller by operation and display the flow measurement result obtained by the controller on the control screen; and the controller is used to receive and execute the operation instruction of the control screen module 32. For example, the control screen can be used to control the controller to execute the gas flow measurement step.

[0045] The controller comprises a receiving unit and a calculation unit, the receiving unit is used to receive the detection result of the temperature detection device 111 and the pressure detection device 114 and transmit the detection result to the calculation unit; the calculation unit is used to automatically calculate the flow measurement result according to the received detection result; and the calculation unit is also used to calculate the number and the number of the supersonic nozzles 116 to be selected according to different detection requirements. Specifically, in order to facilitate the selection of the supersonic nozzles 116, the supersonic nozzles 116 can be numbered, such as No. 1 nozzle, No. 2 nozzle, etc., and when one or more supersonic nozzles 116 need to be opened, the corresponding number can be controlled. The specific selection method of the supersonic nozzles 116 can be selected according to actual needs, for example, the pressure ratio (absolute pressure / atmospheric pressure) can be set, the maximum air source pressure can be set, and whether it is within the range of a certain supersonic nozzle 116 can be judged according to the pressure ratio and the air source pressure value, and when the range of a single supersonic nozzle 116 is exceeded, the combination of multiple supersonic nozzles 116 is recommended.

[0046] The working principle of the flow detection system is as follows: after the air compressor 21 is started, air is compressed and enters the gas storage tank 22 through the pipeline to be stored in the gas storage tank 22 at a certain pressure. The compressed air is filtered to remove large impurities, oil and water and the like through the coarse filter 23, and then enters the drying machine 24 for further drying and dehumidification, and then enters the fine filter 25 for further filtering impurities, and then enters the pressure stabilizing tank 26 to form compressed air with relatively stable pressure, and finally enters the critical flow Venturi nozzle distributor 11 after being cooled and dehumidified by the cold dryer 27. The design of the gas source assembly 2 can ensure the stability of the gas, thereby improving the measurement accuracy.

[0047] The compressed air enters the heater 13 through the pneumatic ball valve to obtain the gas at the required measurement temperature, and then enters the pressure regulator 14. The pressure regulator 14 outputs the gas at a constant pressure according to the set output pressure, and then the input signal of the gas flow is converted and amplified by the pneumatic flow amplifier 12 to more accurately control the output air pressure, thereby further improving the stability and accuracy of the measurement. Finally, the gas enters the stagnation container 113 of the critical flow Venturi nozzle distributor 11. The calculation unit of the controller calculates the nozzle combination mode, controls the corresponding air cylinder 112 to act, pushes the gas out of the selected sonic nozzle 116 to the collection container 115, and finally enters the inner cavity of the engine blade to be detected. The temperature detection device 111 and the pressure detection device 114 in the stagnation container 113 detect the temperature and pressure of the gas and feed back the detection results to the receiving unit of the controller.

[0048] The calculation formula of the measured gas flow is as follows: q m = KPHT 1 / 2 , wherein: q m is the mass flow of the gas flowing through the sonic nozzle (i.e. the flow to be measured), K is the K coefficient of the sonic nozzle, H is the humidity correction coefficient, P is the stagnation pressure of the gas before the sonic nozzle, and T is the stagnation temperature of the gas before the sonic nozzle. Among them, K and H can be pre-set in the software mathematical model of the computer, and P and T can be calculated by measuring and automatically sampling by the computer. In the embodiment of the application, only the gas pressure and temperature before the sonic nozzle need to be measured when calculating the measured gas flow, which can be calculated by the formula, which is very simple and convenient.

[0049] The critical flow Venturi nozzle assembly and the flow detection system of the embodiment of the application effectively improve the detection accuracy of the gas flow, reduce the dependence on the detection environment, and improve the convenience of the detection operation through the cooperation of each component. According to the comparison of experimental data, the detection error of the flow detection system of the embodiment of the application is improved from 2% of the traditional equipment to 5 ‰, which has a wide application prospect. Through the accurate detection of the gas flow in the inner cavity of the engine blade, the designer can detect the rationality of the design, ensure that the blade works more effectively, and further improve the product quality.

[0050] It should be noted that in this paper, the term "includes", "contains" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "includes a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0051] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A critical flow Venturi nozzle assembly for detecting gas flow in an engine vane internal cavity, characterized by, The critical flow Venturi nozzle distributor, the pneumatic flow amplifier and the heater; The critical flow Venturi nozzle distributor comprises a stagnation container, a collection container, a sonic nozzle, a cylinder, a temperature detection device and a pressure detection device, the gas inlet of the stagnation container is connected with the outlet of the pneumatic flow amplifier, the gas inlet end of the sonic nozzle is located in the stagnation container, the gas outlet end of the sonic nozzle is located in the collection container, the cylinder is drivingly connected with the sonic nozzle, the temperature detection device and the pressure detection device are respectively communicated with the stagnation container, and the temperature detection device and the pressure detection device are respectively communicated with the stagnation container, and the temperature detection device and the pressure detection device are respectively communicated with the stagnation container, and the temperature detection device and the pressure detection device are respectively communicated with the stagnation container, and the temperature detection device and the pressure detection device are respectively communicated with the stagnation container, and the temperature detection device and the pressure detection device are respectively communicated with the stagnation container, and the temperature detection device and the pressure detection device are respectively communicated with the stagnation container, and the temperature detection device and the pressure detection device are respectively communicated with the stagnation container, and the temperature detection device and the pressure detection device are respectively communicated with the stagnation container, and the temperature detection device and the pressure detection device are 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The critical flow Venturi nozzle assembly of claim 1, wherein, ​ 3. The critical flow Venturi nozzle assembly of claim 2, wherein, ​ 4. The critical flow Venturi nozzle assembly of claim 3, wherein, ​ 5. A flow detection system characterized by, ​ ​ ​ 6. The flow detection system of claim 5, wherein, ​ 7. The flow detection system of claim 6, wherein, ​ 8. The flow detection system of claim 6, wherein, ​ 9. The flow detection system of claim 5, wherein, ​ 10. The flow detection system of claim 9, wherein, ​ The computing unit is used for automatically calculating flow measurement results according to the received detection results; and the computing unit is also used for calculating different detection requirements and obtaining the number and serial number of the opened sound velocity nozzles which need to be selected.

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