Nozzle and blade flow detection test system and method with correction calculation

Abstract

The invention relates to the technical field of water flow detection, and particularly discloses a nozzle and blade flow detection test system and method with correction calculation. A filter is located 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 pipeline leads to the measuring pipeline, and the other pipeline leads to the overflow pipeline; an electric control valve is arranged on the overflow pipeline, a pipeline behind the electric control valve is connected with the water storage tank, and the overflow flow is controlled by adjusting the opening degree of the electric control valve; the measuring pipeline is sequentially connected with an electromagnetic flowmeter, a pressure sensor and a temperature sensor and is used for testing actual flow, pressure and temperature entering a measured piece, and data detected by the sensors are uploaded to a PLC (Programmable Logic Controller) through a shielded wire for correction processing; according to the method, the flow loss in an actual rough pipeline is considered, and a test result is corrected through a speed distribution formula in the rough pipeline, so that the test precision is further improved.

Description

Technical Field

[0001] The invention 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 Art

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

[0003] The design and manufacture of nozzles and blades have a direct impact on fluid mechanics performance, especially in the fields of aircraft engines, gas turbines and hydropower generation. Through water flow testing, actual working conditions can be simulated to observe the performance of nozzles and blades at different flow rates, pressures and angles. This test can not only examine the processing deviation range of the same batch of components, but also help optimize the design and discover potential failure modes in advance, thereby improving the safety and performance of the overall system. Using simple and effective methods for rapid detection and troubleshooting is a more popular pursuit in industrial production. Most of the existing flow detection methods are relatively simple, and do not take into account the impact of factors such as pipeline losses in actual flow on the test results. For this purpose, a nozzle and blade flow detection test system and method with correction calculation is provided. Summary of the invention

[0004] The purpose of the present invention is to provide a nozzle and blade flow detection test system and method with correction calculation to address the defects of the prior art and solve the problems raised by the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: a nozzle and blade flow detection test system with correction calculation, the system 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 a host machine;

[0006] The filter is located on the pipeline connecting the water tank outlet and the booster pump inlet, and is used to filter impurities in the water to prevent damage to the booster pump; the booster pump outlet is provided with a three-way pipeline, one leading to the measurement pipeline and the other leading to the overflow pipeline;

[0007] An electric regulating valve is arranged on the overflow pipeline, and the pipeline behind the electric regulating valve is connected to the water storage tank. The overflow flow is controlled by adjusting the opening of the electric regulating valve, thereby controlling the flow and pressure leading to the measuring pipeline;

[0008] The measuring pipeline is connected with an electromagnetic flowmeter, a pressure sensor, and a temperature sensor in sequence to test the actual flow, pressure, and temperature entering the measured object, wherein the pressure sensor is installed on the pipeline close to the measured object, and the data detected by the electromagnetic flowmeter, pressure sensor, and temperature sensor are uploaded to the PLC controller by a shielded line for correction processing;

[0009] The water passing through the tested piece enters the return water pipeline, and a reversing valve is arranged on the return water pipeline. The reversing valve is used to control the connection between the return water pipeline and the water storage tank or the weighing container.

[0010] As a preferred technical solution of the present invention, the PLC controller is connected to the host computer and the electric regulating valve respectively.

[0011] As a preferred technical solution of the present invention, the maximum flow range of the booster pump is 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 invention, the overflow pipeline uses an electric regulating valve to adjust the return water volume to control the flow and pressure entering the measuring pipeline. The actual measurement flow range of the measuring pipeline is 1m 3 / h~10m 3 / h, the pressure range is within 0.3Mpa-1.0Mpa.

[0013] As a preferred technical solution of the present invention, the reversing valve on the return water pipeline is used to adjust the return water route according to different measurement methods;

[0014] When the measurement method is the weighing method, the reversing valve is adjusted to flow the pipeline to the weighing container, and the water flow passing through within a certain period of time is collected and weighed to obtain the mass flow Q passing through the measured object. m ;

[0015]

[0016] When the measurement method is the Bernoulli equation method, the reversing valve is adjusted to the return water of the water storage tank, and the values ​​obtained by the electromagnetic flow meter, temperature sensor, and pressure sensor are used to calculate the equivalent flow area A through the measured object according to the Bernoulli equation;

[0017]

[0018] The PLC controller collects pressure data through the control system, makes corrections based on the turbulent flow velocity distribution equation, and solves the equation to calculate the actual flow area of ​​the measured object:

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

[0020]

[0021] In the formula, k is 0.3-0.5, Δ is the equivalent roughness, which is 0.001-0.01, and C2 is 8.2-8.7. Integrate both ends of the formula to get

[0022]

[0023] Where D is the equivalent diameter of the actual flow area of ​​the test piece to be calculated, v * is the power speed, and the expression is:

[0024]

[0025] in Substitute it into:

[0026]

[0027] in:

[0028] Q—indication of electromagnetic flowmeter, τ—test time, D—equivalent diameter of flow area of ​​the tested piece, p1—indication of pressure sensor, p2—local atmospheric pressure, ρ—temperature sensor and water density under the temperature sensor indication, A1—cross-sectional area of ​​the pipe in front of the tested piece.

[0029] A nozzle and blade flow detection method with correction calculation is implemented by the above system. The specific detection steps are as follows:

[0030] Step 1: Check the water level in the water tank to ensure that the water storage capacity is above 1 / 2, and check the filter to ensure that the filter is not clogged;

[0031] Step 2: Prepare for calibration before use, connect the standard nozzle, adjust the reversing valve to the return pipe connected to the water tank, and fully open the electric regulating valve;

[0032] Step 3: Turn on the booster pump and observe whether the electromagnetic flowmeter has numerical feedback and whether the pressure gauge connected to the pressure sensor has pressure numerical feedback;

[0033] Step 4: Use the PLC controller to adjust the electric regulating valve to gradually reduce the flow through the overflow pipeline, observe that the electromagnetic flowmeter reading gradually increases, the pressure sensor reading gradually increases, and when the pressure sensor reading increases to 0.2MPa, record the electromagnetic flowmeter reading, and then continue to adjust the electric regulating valve. Record the electromagnetic flowmeter reading when the pressure sensor reading is 0.25MPa, 0.3MPa, 0.35MPa, 0.4Mpa, 0.45Mpa, and 0.5Mpa, respectively. Calculate the standard nozzle cross-sectional area at different pressures through the Bernoulli equation, and compare it with the actual cross-sectional area to obtain the error curve. The maximum error can be detected within 2%;

[0034] Step 5: Replace the standard nozzle with the object to be tested and repeat the above steps to obtain the actual cross-sectional area of ​​the object to be tested;

[0035] Step 6: Based on the pressure and flow data recorded during the test, the calculated equivalent diameter is corrected using the turbulent flow velocity distribution equation in the rough pipe.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention discloses a nozzle and blade flow detection test system and method with correction calculation, which is simple, reliable, economical and practical, and can select different test methods according to the characteristics of the test piece and other actual test conditions to improve the test efficiency; the method takes into account the flow loss in the actual rough pipeline, and corrects the test results through the velocity distribution formula in the rough pipe, so that the test accuracy is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the nozzle and blade flow rate detection test system with correction calculation of the present invention;

[0038] Figure 2 This is the control logic diagram of the system of the present invention;

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

[0040] 101-water 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-test piece, 201-PLC controller, 202-host computer. DETAILED DESCRIPTION

[0041] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0042] Example: Combination Figures 1-2 As shown, an embodiment of the present invention provides a nozzle and blade flow detection test system with correction calculation, which is composed of a water 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, etc.

[0043] The filter 102 is located on the pipeline connecting the outlet of the water 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; a three-way pipeline is set at the outlet of the booster pump 103, one way leads to the measuring pipeline, and the other way leads to the overflow pipeline; an electric regulating valve 104 is set on the overflow pipeline, and the pipeline behind the electric regulating valve 104 is connected to the water tank 101. The overflow flow is controlled by adjusting the opening of the electric regulating valve 104, so as to control the flow and pressure leading to the measuring pipeline; the electromagnetic flowmeter 105, the pressure sensor 106, and the temperature sensor 107 are connected to the measuring pipeline in sequence to test the actual flow, pressure, and temperature parameters entering the measured object, among which the pressure sensor 106 is as close to the measured object as possible, and the data of each sensor is uploaded to the PLC controller 201 by the shielded line for processing; the interface of the tested object is set at the back, and the water after passing through the test object enters the return water pipeline. A reversing valve 108 is set on the return water pipeline, and different test methods are selected according to the characteristics of different tested objects.

[0044] Different test methods include weighing method and Bernoulli equation method. When using the weighing method, the reversing valve 109 is used to adjust the pipeline flow to the water collection weighing container 109, and the water flow passing through within a certain period of time is collected and weighed to obtain the mass flow through the test piece. When using the Bernoulli equation method, the reversing valve 108 is used to adjust the pipeline flow to the water storage tank 101 to return water, and the equivalent flow area through the test piece is calculated according to the Bernoulli equation through the feedback values ​​of the electromagnetic flowmeter 105, the temperature sensor 106, and the pressure sensor 107. Since the equivalent flow area is measured using the Bernoulli equation method based on the assumption that the pipeline is in a uniform flow state, considering that the velocity cross-section distribution of the actual flow in the pipeline is in a non-uniform state, the turbulent flow velocity distribution equation in the rough pipe is used to correct the calculated equivalent diameter.

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

[0046] Step 1: Check the water level of the water tank 101 to ensure that the water storage capacity is above 1 / 2, and check the filter 102 to ensure that the filter is not clogged;

[0047] Step 2: Prepare for calibration work before use, connect the standard nozzle, adjust the reversing valve 108 to the return water pipeline, and fully open the electric regulating valve 104;

[0048] Step 3: Turn on the booster pump 103, and observe whether the electromagnetic flow meter 105 has numerical feedback, and whether the pressure gauge 106 has pressure numerical feedback;

[0049] Step 4: Adjust the electric regulating valve 104 to gradually reduce the flow through the overflow pipeline, observe that the reading of the electromagnetic flowmeter 105 gradually increases, the reading of the pressure sensor 106 gradually increases, and when the reading of the pressure sensor 106 increases to 0.2MPa, record the reading of the electromagnetic flowmeter 105, and then continue to adjust the electric regulating valve 104, and record the reading of the electromagnetic flowmeter 105 when the reading of the pressure sensor 106 is 0.25MPa, 0.3MPa, 0.35MPa, 0.4Mpa, 0.45Mpa, and 0.5Mpa, respectively. Calculate the standard nozzle cross-sectional area at different pressures through the Bernoulli equation, and compare it with the actual cross-sectional area to obtain the error curve. The maximum error can be detected within 2%;

[0050] Step 5: Replace the standard nozzle with the test piece and repeat the above steps to obtain the actual flow cut-off area of ​​the test piece.

[0051] Step 6: Based on the pressure and flow data recorded during the test, use the flow velocity distribution formula in the rough pipe to correct the calculated equivalent diameter.

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

[0053]

[0054] The above embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A nozzle and blade flow detection test system with correction calculation, characterized in that: The system is composed of a water storage tank (101), a filter (102), a booster pump (103), an electric regulating valve (104), an electromagnetic flow meter (105), a pressure sensor (106), a temperature sensor (107), a reversing valve (108), a weighing container (109), a PLC controller (201) and a host computer (202); The filter (102) is located on a 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); a three-way pipeline is provided at the outlet of the booster pump (103), one of which leads to the measurement pipeline and the other leads to the overflow pipeline; An 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). The overflow flow is controlled by adjusting the opening of the electric regulating valve (104), so as to control the flow and pressure leading to the measuring pipeline; The measuring pipeline is connected in sequence to an electromagnetic flowmeter (105), a pressure sensor (106), and a temperature sensor (107) for testing the actual flow, pressure, and temperature of the measured object (110), wherein the pressure sensor (106) is installed on a pipeline close to the measured object (110), and the data detected by the electromagnetic flowmeter (105), the pressure sensor (106), and the temperature sensor (107) are uploaded to the PLC controller (201) via a shielded line for correction processing; The water passing through the tested object (110) enters the return water pipeline, and a reversing valve (108) is arranged on the return water pipeline. The reversing valve (108) is used to control the communication between the return water pipeline and the water storage tank (101) or the weighing container (109).

2. The nozzle and blade flow rate detection test system with correction calculation according to claim 1 is characterized in that: The PLC controller (201) is connected to the host computer (202) and the electric regulating valve (104) respectively.

3. The nozzle and blade flow rate detection and testing system with correction calculation according to claim 1 is characterized in that: The maximum flow rate of the booster pump (103) is within 6m 3 / h~14m 3 / h, and the maximum outlet pressure is within 0.6~1.2Mpa.

4. The nozzle and blade flow rate detection test system with correction calculation according to claim 1 is characterized in that: The overflow pipeline uses an electric regulating valve (104) to adjust the return water volume, which is used to control the flow rate and pressure entering the measuring pipeline. The actual measuring flow range of the measuring pipeline is 1m 3 / h~10m 3 / h, the pressure range is within 0.3Mpa-1.0Mpa.

5. The nozzle and blade flow rate detection and testing system with correction calculation according to claim 1 is characterized in that: The reversing valve (108) on the water return pipeline is used to adjust the water return route according to different measurement methods; When the measuring method is the weighing method, the reversing valve (108) is used to adjust the pipeline flow to the weighing container (109), and the water flow passing through within a certain period of time is collected and weighed to obtain the mass flow Q passing through the measured object (110). m ; When the measurement method is the Bernoulli equation method, the reversing valve (108) is adjusted to return water from the water storage tank (101), and the values ​​obtained by the electromagnetic flow meter (105), the temperature sensor (107), and the pressure sensor (106) are used to calculate the equivalent flow area A through the measured object (110) according to the Bernoulli equation; The PLC controller (201) collects pressure data through the control system, makes corrections based on the turbulent flow velocity distribution equation, and solves the equation to calculate the actual flow area of ​​the measured object: in: Q—indication of electromagnetic flowmeter, τ—test time, D—equivalent diameter of flow area of ​​the tested piece, p1—indication of pressure sensor, p2—local atmospheric pressure, ρ—temperature sensor and water density under the temperature sensor indication, A1—cross-sectional area of ​​the pipe in front of the tested piece.

6. A nozzle and blade flow detection method with correction calculation, characterized in that: The detection is implemented by the system according to any one of claims 1 to 5, and the specific detection steps are as follows: Step 1: Check the water level in the water tank (101) to ensure that the water storage capacity is above 1 / 2, and check the filter (102) to ensure that the filter is not clogged; Step 2: Prepare for calibration before use, connect the standard nozzle, adjust the reversing valve (108) to the return water pipeline connected to the water storage tank (101), and fully open the electric regulating valve (104); Step 3: Turn on the booster pump (103) and observe whether the electromagnetic flow meter (105) has any numerical feedback and whether the pressure gauge connected to the pressure sensor (106) has any pressure numerical feedback; Step 4: Regulate the electric regulating valve (104) through the PLC controller (201) to gradually reduce the flow through the overflow pipeline, observe that the reading of the electromagnetic flowmeter (105) gradually increases, and the reading of the pressure sensor (106) gradually increases. When the reading of the pressure sensor (106) increases to 0.2MPa, record the reading of the electromagnetic flowmeter (105), and then continue to adjust the electric regulating valve (104). When the reading of the pressure sensor (106) is 0.25MPa, 0.3MPa, 0.35MPa, 0.4Mpa, 0.45Mpa, and 0.5Mpa, respectively, the reading of the electromagnetic flowmeter (105) is recorded, and the standard nozzle cross-sectional area under different pressures is calculated by the Bernoulli equation, and compared with the actual cross-sectional area, so as to obtain an error curve. The maximum error can be detected within 2%; Step 5: Replace the standard nozzle with the test piece (110), and repeat the above steps to obtain the actual flow interception area of ​​the test piece (110); Step 6: Based on the pressure and flow data recorded during the test, the calculated equivalent diameter is corrected using the turbulent flow velocity distribution equation in the rough pipe.

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