Nozzle and vane flow calibration test system and method with correction calculation

Abstract

The application relates to the technical field of water flow detection, and particularly discloses a nozzle and a vane flow detection test system and method with correction calculation, wherein a filter is arranged on a pipeline connecting an outlet of a water storage tank and an inlet of a booster pump; a three-way pipeline is arranged at an outlet of the booster pump, one way of which leads to a measuring pipeline, and the other way leads to an overflow pipeline; an electric regulating valve is arranged on the overflow pipeline, and a pipeline after the electric regulating valve is connected with the water storage tank, so that the overflow flow is controlled by adjusting the opening degree of the electric regulating valve; an electromagnetic flowmeter, a pressure sensor and a temperature sensor are sequentially connected on the measuring pipeline, and are used for testing the actual flow, pressure and temperature of a measured piece; and the data detected by the sensors is transmitted to a PLC controller through shielding lines and is subjected to correction processing; the method considers the flow loss in an actual rough pipeline, and the test result is corrected through a velocity distribution formula in the rough pipeline, so that the test precision is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water flow detection, in particular to a nozzle and blade flow detection test system and method with correction calculation. BACKGROUND

[0002] In China, with the rapid development of aerospace, gas turbine, automobile and other fields, the machining precision of key components such as nozzles and blades is increasingly valued. In order to obtain the actual flow area and deviation range of the same batch of components, water flow detection test system has gradually become a key research and testing tool for evaluating the performance of nozzles and blades in fluid dynamics environment, and ensuring their reliability and efficiency in actual application.

[0003] The design and manufacture of nozzles and blades have a direct impact on fluid dynamics performance, especially in the fields of aircraft engines, gas turbines and hydroelectric power generation. Through water flow test, the actual working conditions can be simulated, and the performance of nozzles and blades under different flow rates, pressures and angles can be observed. This test not only investigates the machining deviation range of the same batch of components, but also helps to optimize the design and discover potential failure modes in advance, thereby improving the safety and performance of the overall system. Rapid detection and troubleshooting using simple and effective methods are more popular in industrial production. Most of the existing flow detection methods are relatively single, and do not take into account the influence of factors such as pipeline loss in actual flow on test results. Therefore, a nozzle and blade flow detection test system and method with correction calculation are provided. SUMMARY

[0004] The purpose of the present application is to overcome the defects of the prior art and provide a nozzle and blade flow detection test system and method with correction calculation to solve the problems raised in the background.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a nozzle and blade flow detection test system with correction calculation, which is composed of a water storage tank, a filter, a booster pump, an electric regulating valve, an electromagnetic flowmeter, a pressure sensor, a temperature sensor, a reversing valve, a weighing container, a PLC controller and an upper computer.

[0006] The filter is located on the pipeline connecting the outlet of the water storage tank and the inlet of the booster pump, and is used to filter impurities in the water to prevent damage to the booster pump. The outlet of the booster pump is provided with a three-way pipeline, one of which leads to the measuring pipeline and the other of which leads to the overflow pipeline.

[0007] The overflow pipeline is provided with an electric regulating valve, and the pipeline behind the electric regulating valve is connected to the water storage tank. By adjusting the opening of the electric regulating valve, the overflow flow can be controlled, so as to control the flow and pressure of the measuring pipeline.

[0008] The measuring pipeline is sequentially connected with an electromagnetic flowmeter, a pressure sensor and a temperature sensor, which are used for testing the actual flow, pressure and temperature of the entering measured member, wherein the pressure sensor is installed close to the pipeline of the measured member, and the data detected by the electromagnetic flowmeter, the pressure sensor and the temperature sensor are transmitted to the PLC controller through shielding lines for correction processing.

[0009] The water after passing through the measured member enters the return water pipeline, and a reversing valve is arranged on the return water pipeline, which is used for controlling the communication between the return water pipeline and the water storage tank or the weighing container.

[0010] As a preferred technical solution of the present application, the PLC controller is connected with an upper computer and an electric regulating valve respectively.

[0011] As a preferred technical solution of the present application, the maximum flow range of the booster pump is within 6m 3 / h-14m 3 / h, and the maximum outlet pressure is within 0.6-1.2Mpa.

[0012] As a preferred technical solution of the present application, the overflow pipeline is adjusted by the electric regulating valve to return water, which is used for realizing the control of the flow and pressure entering the measuring pipeline, and the actual measuring flow range of the measuring pipeline is within 1m 3 / h-10m 3 / h, and the pressure range is within 0.3Mpa-1.0Mpa.

[0013] As a preferred technical solution of the present application, the reversing valve on the return water pipeline is used for adjusting the return water route according to different measuring methods.

[0014] When the measuring method is the weighing method, the reversing valve is adjusted to flow to the weighing container, the water flow passing through in a certain time is collected and weighed, and the mass flow Q m passing through the measured member can be obtained.

[0015]

[0016] When the measuring method is the Bernoulli equation method, the reversing valve is adjusted to return water to the water storage tank, and the values obtained by the electromagnetic flowmeter, the temperature sensor and the pressure sensor are used to calculate the equivalent flow area A passing through the measured member according to the Bernoulli equation.

[0017]

[0018] The PLC controller collects the pressure data through the control system, corrects according to the turbulent flow velocity distribution equation, and calculates the actual flow area of the measured member by solving the equation.

[0019] Since the Bernoulli equation method is based on the assumption that the pipeline is in a uniform flow state when measuring the equivalent flow area, considering the actual velocity distribution in the pipeline is in a non-uniform state, the flow velocity distribution formula in the rough pipe is used to correct the calculated equivalent diameter:

[0020]

[0021] Where k is 0.3-0.5, Δ is the equivalent roughness, 0.001-0.01, and C2 is 8.2-8.7. Integrating both ends of the formula gives

[0022]

[0023] Where D is the equivalent diameter of the actual flow area of the measured part, v * is the dynamic velocity, and the expression is:

[0024]

[0025] Where Substituting gives:

[0026]

[0027] Where:

[0028] Q - electromagnetic flow meter reading, τ - test time, D - equivalent diameter of the flow area of the measured part, p1 - pressure sensor reading, p2 - local atmospheric pressure, ρ - water density at the temperature sensor and temperature sensor reading, A1 - pipe cross-sectional area before the measured part.

[0029] A nozzle and blade flow detection method with correction calculation, realized by the above system, the specific detection steps are as follows:

[0030] Step one: Check the water level of the water storage tank to ensure that the water storage capacity is more than 1 / 2, and check the filter to ensure that there is no filter screen blockage;

[0031] Step two: Prepare for calibration before use, connect the standard nozzle, adjust the reversing valve to the backwater pipeline connected to the water storage tank, and fully open the electric regulating valve;

[0032] Step three: Turn on the booster pump and observe whether the electromagnetic flow meter has a numerical feedback, and whether the pressure gauge connected to the pressure sensor has a pressure numerical feedback;

[0033] Step four: adjust the electric regulating valve through the PLC controller, so that the flow through the overflow pipeline gradually decreases, the electromagnetic flowmeter reading gradually increases, and the pressure sensor reading gradually increases, when the pressure sensor reading increases to 0.2 MPa, the electromagnetic flowmeter reading is recorded, then the electric regulating valve is continuously adjusted, and the electromagnetic flowmeter readings are recorded when the pressure sensor readings are 0.25 MPa, 0.3 MPa, 0.35 MPa, 0.4 MPa, 0.45 MPa and 0.5 MPa respectively, the standard nozzle flow area under different pressures is calculated through the Bernoulli equation, and compared with the actual flow area, so that the error curve is obtained, and the maximum error is within 2%, so that the detection can be carried out;

[0034] Step five: the standard nozzle is replaced by the measured piece, and the above steps are repeated, so that the actual flow area of the measured piece is obtained;

[0035] Step six: according to the pressure and flow data recorded in the test process, the calculated equivalent diameter is corrected by using the velocity distribution equation of turbulent flow in a rough pipe.

[0036] Compared with the prior art, the beneficial effects of the present application are that the nozzle and blade flow detection test system and method with correction calculation are disclosed, the method is simple, reliable, economical, practical and can select different test methods according to the characteristics of the measured piece and other actual test conditions, and the test efficiency is improved; the actual flow loss in the actual rough pipeline is considered, and the test result is corrected through the velocity distribution formula in the rough pipe, so that the test precision is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0037] Fig. 1 It is a schematic diagram of the nozzle and blade flow detection test system with correction calculation of the present application;

[0038] Fig. 2 It is a system control logic diagram of the present application;

[0039] In the above drawings, the meanings of the reference signs are as follows:

[0040] 101-water storage tank, 102-filter, 103-boosting pump, 104-electric regulating valve, 105-electromagnetic flowmeter, 106-pressure sensor, 107-temperature sensor, 108-reversing valve, 109-weighing container, 110-measured piece, 201-PLC controller, 202-upper computer. DETAILED DESCRIPTION

[0041] The preferred embodiments of the present application are described in detail below with reference to the drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the protection scope of the present application is more clearly and explicitly defined.

[0042] Example:Figs. 1-2 As shown, the embodiment of the present application provides a nozzle and vane flow detection test system with correction calculation, which is composed of a water storage tank 101, a filter 102, a booster pump 103, an electric regulating valve 104, an electromagnetic flowmeter 105, a pressure sensor 106, a temperature sensor 107, a reversing valve 108, a weighing container 109, a PLC controller 201 and the like.

[0043] The filter 102 is located on the pipeline connecting the outlet of the water storage tank 101 and the inlet of the booster pump 103, and is used to filter impurities in the water to prevent damage to the booster pump 103; the outlet of the booster pump 103 is provided with a three-way pipeline, one of which leads to a measuring pipeline, and the other of which leads to an overflow pipeline; the electric regulating valve 104 is arranged on the overflow pipeline, and the pipeline behind the electric regulating valve 104 is connected to the water storage tank 101, so as to control the overflow flow by adjusting the opening of the electric regulating valve 104, thereby realizing the control of the flow and pressure to the measuring pipeline; the measuring pipeline is sequentially connected with the electromagnetic flowmeter 105, the pressure sensor 106 and the temperature sensor 107, which are used to test the actual flow, pressure and temperature parameters of the measured member, wherein the pressure sensor 106 is as close as possible to the measured member, and the data of each sensor is transmitted to the PLC controller 201 by shielded wire for processing; a measured member interface is arranged at the rear, and the water after the test member enters a backwater pipeline, and the reversing valve 108 is arranged on the backwater pipeline, so as to select different test methods according to the characteristics of different measured members.

[0044] Different test methods include weighing method and Bernoulli equation method; when the weighing method is used, the reversing valve 109 is adjusted to guide the pipeline flow to the water collecting weighing container 109, the water flow passing through the test member within a certain time is collected and weighed, so as to obtain the mass flow passing through the test member; when the Bernoulli equation method is used, the reversing valve 108 is adjusted to guide the pipeline flow to the water storage tank 101 backwater, and the feedback values of the electromagnetic flowmeter 105, the temperature sensor 106 and the pressure sensor 107 are used to calculate the equivalent flow area passing through the test member according to the Bernoulli equation. Since the Bernoulli equation method is based on the assumption that the pipeline is in a uniform flow state, the rough pipe turbulent flow velocity distribution equation is used to correct the calculated equivalent diameter considering that the actual flow velocity cross-section distribution in the pipeline is in a non-uniform state.

[0045] A nozzle and vane flow detection method with correction calculation, and the specific test steps are as follows:

[0046] Step one: check the water level of the water storage tank 101 to ensure that the water storage capacity is more than 1 / 2, and check the filter 102 to ensure that there is no filter screen blockage;

[0047] Step two: calibrate the work before use, connect the standard nozzle, adjust the reversing valve 108 to the backwater pipeline, and fully open the electric regulating valve 104;

[0048] Step three: open the booster pump 103, observe whether the electromagnetic flowmeter 105 has a numerical feedback, whether the pressure gauge 106 has a pressure numerical feedback;

[0049] Step four: adjust the electric regulating valve 104, so that the flow through the overflow pipeline gradually decreases, observe the electromagnetic flowmeter 105 gradually increases, the pressure sensor 106 gradually increases, when the pressure sensor 106 shows 0.2MPa, record the electromagnetic flowmeter 105, then continue to adjust the electric regulating valve 104, respectively, when the pressure sensor 106 shows 0.25MPa, 0.3MPa, 0.35MPa, 0.4Mpa, 0.45Mpa, 0.5Mpa, record the electromagnetic flowmeter 105, calculate the standard nozzle cross-sectional area under different pressures by Bernoulli equation, and compare with the actual cross-sectional area, so as to obtain the error curve, the maximum error is within 2%, which can be detected;

[0050] Step five: replace the standard nozzle with the test piece, repeat the above steps, and the actual cross-sectional area of the measured piece can be obtained;

[0051] Step six: according to the pressure flow data recorded in the test process, the calculated equivalent diameter is corrected by using the flow velocity distribution formula in rough pipe.

[0052] The following is the comparison of the results calculated by Bernoulli equation and the corrected results of turbulent flow velocity distribution equation when the standard nozzle is used as the measured piece in the flow test system of the application. It can be seen that the corrected cross-sectional area by the flow velocity distribution formula in rough pipe is closer to the true value, the error of Bernoulli equation method is about 2%, and the error value after correction is reduced by about 0.3%-0.5%, which shows that the test system and method of the application are real and effective.

[0053]

[0054] The above examples only express the embodiments of the application, and the description is more specific and detailed, but it cannot be understood as limiting the scope of the patent. It should be noted that for ordinary skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which are within the scope of protection of the application.

Claims

1. A nozzle and vane flow verification test system with correction calculation, characterized by: The system is composed of a water storage tank (101), a filter (102), a booster pump (103), an electric regulating valve (104), an electromagnetic flowmeter (105), a pressure sensor (106), a temperature sensor (107), a reversing valve (108), a weighing container (109), a PLC controller (201) and an upper computer (202); The filter (102) is located on the pipeline connecting the outlet of the water storage tank (101) and the inlet of the booster pump (103), and is used to filter impurities in the water to prevent damage to the booster pump (103); the outlet of the booster pump (103) is provided with a three-way pipeline, one of which leads to a measuring pipeline and the other of which leads to an overflow pipeline; The overflow pipeline is provided with an electric regulating valve (104), and the pipeline behind the electric regulating valve (104) is connected to the water storage tank (101); by adjusting the opening of the electric regulating valve (104), the overflow flow is controlled, and the flow and pressure to the measuring pipeline are controlled; The measuring pipeline is sequentially connected with an electromagnetic flowmeter (105), a pressure sensor (106) and a temperature sensor (107), which are used to test the actual flow, pressure and temperature of the water entering the measured member (110); the installation position of the pressure sensor (106) is close to the pipeline of the measured member (110); the data detected by the electromagnetic flowmeter (105), the pressure sensor (106) and the temperature sensor (107) are transmitted to the PLC controller (201) through shielded wires for correction and processing; The water after passing through the measured member (110) enters a backwater pipeline, and the backwater pipeline is provided with a reversing valve (108); the reversing valve (108) is used to control the communication between the backwater pipeline and the water storage tank (101) or the weighing container (109).

2. The nozzle and vane flow verification test system with corrected calculations of claim 1, wherein: The PLC controller (201) is connected with the upper computer (202) and the electric regulating valve (104) respectively.

3. The nozzle and vane flow verification test system with corrected calculations of claim 1, wherein: The maximum flow range of the booster pump (103) is within 6m 3 / h~14m 3 The maximum outlet pressure is within 0.6~1.2Mpa.

4. The nozzle and vane flow verification test system with corrected calculations of claim 1, wherein: The overflow pipeline is regulated by an electric regulating valve (104) to regulate the water return, so as to control the flow and pressure entering the measuring pipeline, the actual measuring flow range of the measuring pipeline is 1m 3 / h~10m 3 / h, and the pressure range is within 0.3Mpa-1.0Mpa.

5. The nozzle and vane flow verification test system with corrected calculations of claim 1, wherein: The reversing valve (108) on the backwater pipeline is used to adjust the backwater route according to different measurement methods; When the measuring method is the weighing method, the reversing valve (108) is adjusted to direct the pipeline flow to the weighing container (109), the water flow passing through in a certain time is collected and weighed, and the mass flow Q passing through the measured piece (110) can be obtained m ; When the measurement method is the Bernoulli equation method, the reversing valve (108) is adjusted to the water storage tank (101) backwater; the values obtained by the electromagnetic flowmeter (105), the temperature sensor (107) and the pressure sensor (106) are used to calculate the equivalent flow area A of the measured member (110) according to the Bernoulli equation; The PLC controller (201) collects pressure data through the control system, corrects them according to the turbulent flow velocity distribution equation, and calculates the actual flow area of the measured member by solving the equation: Wherein: Q—electromagnetic flowmeter reading, τ—test time, D—equivalent diameter of the flow area of the measured member, p1—pressure sensor reading, p2—local atmospheric pressure, ρ—water density at the temperature sensor reading, A1—cross-sectional area of the pipeline before the measured member.

6. A method of nozzle and vane flow detection with correction calculation, characterized by: The specific detection steps are as follows by using the system of any one of claims 1-5: Step one: check the water level of the water storage tank (101) to ensure that the water storage capacity is more than 1 / 2, and check the filter (102) to ensure that there is no filter screen blockage; Step two: calibration before use, connect the standard nozzle, adjust the reversing valve (108) to the backwater pipeline connected with the water tank (101), and open the electric regulating valve (104); Step three: open the booster pump (103), and observe whether the electromagnetic flowmeter (105) has numerical feedback and whether the pressure gauge connected with the pressure sensor (106) has pressure numerical feedback; Step four: adjust the electric regulating valve (104) through the PLC controller (201), so that the flow through the overflow pipeline gradually decreases, and observe that the electromagnetic flowmeter (105) gradually increases, and the pressure sensor (106) gradually increases. When the pressure sensor (106) increases to 0.2 MPa, record the electromagnetic flowmeter (105) reading. Then continue to adjust the electric regulating valve (104), and record the electromagnetic flowmeter (105) reading when the pressure sensor (106) reading is 0.25 MPa, 0.3 MPa, 0.35 MPa, 0.4 MPa, 0.45 MPa, and 0.5 MPa, respectively. Calculate the standard nozzle cross-sectional area under different pressures by Bernoulli equation, and compare it with the actual cross-sectional area, so as to obtain the error curve. The maximum error within 2% can be detected; Step five: replace the standard nozzle with the measured piece (110), and repeat the above steps to obtain the actual cross-sectional area of the measured piece (110); Step six: according to the pressure flow data recorded during the test, use the rough pipe turbulent flow velocity distribution equation to correct the calculated equivalent diameter.

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