Engine exhaust plume injection port flame hydraulic regulation experimental device and control method thereof

Abstract

An engine exhaust plume injection port flame hydraulic regulation experimental device, including: engine exhaust plume injection port, flame regulation device, flame detection device, the engine exhaust plume injection port is opposite the inlet end of flame regulation device setting, the outlet end of flame regulation device is provided with flame detection device;The adjustable metal thin wall plate is relatively arranged in the adjustable gas nozzle, the area between two metal thin wall plates is the exhaust plume injection area, each metal thin wall plate is fixed in the flame regulation device by three hydraulic cylinders, the metal thin wall plate deforms along with the lifting of three hydraulic cylinders when the engine exhaust plume injection port injects the exhaust plume.The design is not only safe and reliable, but also realizes fine control, effectively improves work efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to an engine exhaust plume injection port flame hydraulic regulation experiment device and a control method thereof, and particularly relates to the accuracy and stability control of the exhaust plume injection experiment. BACKGROUND

[0002] The flame hydraulic regulation experiment device is used for regulating the size of the engine exhaust plume injection port flame, and the equipment state directly affects the safety of the engine. For a long time, the response measures for the hydraulic drive mechanism fault of the flame hydraulic regulation experiment device are limited to the redundancy of the hydraulic drive mechanism and other actuators, that is, when a set of hydraulic drive mechanism fails, a sound and light alarm is triggered, and another set of hydraulic drive mechanism is replaced, which seriously affects the safety and stability of the engine and the working efficiency. SUMMARY

[0003] The present application aims to overcome the problems of single control means and poor safety in the prior art, and provides an engine exhaust plume injection port flame hydraulic regulation experiment device and a control method thereof with fine control and high safety and reliability.

[0004] To achieve the above purpose, the technical solution of the present application is as follows:

[0005] An engine exhaust plume injection port flame hydraulic regulation experiment device, comprising: an engine exhaust plume injection port, a flame regulation device, and a flame detection device, wherein the engine exhaust plume injection port is arranged opposite to the inlet end of the flame regulation device, and the outlet end of the flame regulation device is provided with the flame detection device; a pair of adjustable metal thin-walled plates are arranged oppositely in the flame regulation device, and the area between the two metal thin-walled plates is the exhaust plume injection area; each metal thin-walled plate is fixed to the inside of the flame regulation device by three hydraulic cylinders, and the metal thin-walled plate deforms with the lifting of the three hydraulic cylinders when the engine exhaust plume injection port injects the exhaust plume.

[0006] The piston rod end of the hydraulic cylinder is connected to the outer side wall of the metal thin-walled plate through a universal bearing, and the cylinder seat of the hydraulic cylinder is fixed to the bracket inside the flame regulation device.

[0007] The oil circuit of each hydraulic cylinder is connected to the hydraulic pump station through a servo valve group, and the control end of the servo valve group and the hydraulic pump station is connected to the corresponding control signal output end of the controller.

[0008] A displacement sensor and a pressure sensor are arranged in each hydraulic cylinder, and a deformation sensor, an acceleration sensor and a temperature sensor are installed at the connection between each universal bearing and the metal thin-walled plate.

[0009] The signal output ends of the displacement sensor, pressure sensor, deformation sensor, acceleration sensor and temperature sensor are connected in communication with corresponding feedback signal input ends on the controller.

[0010] An outlet temperature sensor is arranged in the flame detection device, and a signal output end of the outlet temperature sensor is connected in communication with a corresponding feedback signal input end on the controller.

[0011] A control method of an engine exhaust flame injection port flame hydraulic regulation experimental device, comprising the following steps:

[0012] S1, preliminary setting of threshold value:

[0013] When the hydraulic regulation experimental device is working, the hydraulic oil cylinder is controlled by adjusting the opening of the servo valve group and the pressure of the hydraulic pump station, and then the shape of the metal thin-walled plate is changed to achieve the purpose of regulating the outlet temperature; the change requirements of the engine exhaust flame injection port are known, and the requirements of the set outlet temperature change and the set outlet temperature change rate of the outlet end of the flame regulation device are known, the corresponding cylinder pressure threshold value, thin-walled plate temperature threshold value, thin-walled plate deformation threshold value, thin-walled plate acceleration threshold value, each cylinder displacement threshold value and the change requirements of the cylinder displacement change rate threshold value are obtained according to the known requirements, and an outlet flame temperature PID feedback regulation model is constructed, and the proportional gain parameter, integral gain parameter and differential gain parameter are set;

[0014] Then the above set threshold value requirements and the outlet flame temperature PID feedback regulation model are imported into the controller, and then S2 is entered;

[0015] S2, ignition experiment:

[0016] S2.1 After the controller imports the set requirements, the engine is ignited, and the engine exhaust flame injection port ejects flame;

[0017] S2.2 The controller collects the temperature signal output by the flame detection device in real time, and monitors the temperature accuracy and temperature stability of the outlet flame respectively, when the outlet flame detection device detects that the outlet flame temperature exceeds the set outlet temperature threshold value ± 2℃, S3 is entered; when the outlet flame detection device detects that the outlet flame temperature change rate exceeds the set outlet temperature change rate threshold value ± 0.8℃ / 50ms, S4 is entered;

[0018] S2.3 When the experiment is completed, the engine is turned off, the controller controls the hydraulic oil cylinder to move to adjust the shape of the metal thin-walled plate to the initial ignition shape, and then the controller stops monitoring;

[0019] S3, outlet flame temperature accuracy control of the hydraulic regulation experimental device:

[0020] When the outlet flame detection device detects that the outlet flame temperature exceeds the set outlet temperature threshold ± 2℃, first, the average value of the hydraulic cylinder rod cavity pressure is controlled to reach the cylinder pressure threshold range by adjusting the outlet end pressure of the hydraulic pump station; then, the average value of the collected temperature on the metal thin-walled plate is controlled to reach the thin-walled plate temperature threshold range by adjusting the opening of the servo valve group; finally, the displacement of all cylinders is controlled to meet the set cylinder displacement threshold requirement by adjusting the proportional gain parameter, and after all the adjustments are completed, the flame temperature precision and the flame temperature stability are continued to be monitored in S2.2.

[0021] S4, outlet flame temperature stability control of the hydraulic adjustment experimental device:

[0022] When the outlet flame detection device detects whether the outlet flame temperature rate of change exceeds the set outlet flame temperature rate of change threshold ± 0.8℃ / 50ms, first, the average value of the deformation is controlled to reach the thin-walled plate deformation threshold range by adjusting the differential gain parameter and the integral gain parameter; then, the average value of the acceleration is controlled to reach the thin-walled plate acceleration threshold range by adjusting the opening of the servo valve group; finally, the displacement rate of change of all cylinders is controlled to meet the cylinder displacement rate of change threshold requirement by adjusting the differential gain parameter and the integral gain parameter, and then the outlet flame temperature stability control is completed; the flame temperature precision and the flame temperature stability are continued to be monitored in S2.2.

[0023] In the S3 outlet flame temperature precision control of the hydraulic adjustment experimental device, the following contents are included:

[0024] S3.1, the controller checks whether the average value of the pressure collected by the pressure sensor of all the hydraulic cylinders is within the cylinder pressure threshold ± 0.1MPa range; if not, the control system is adjusted to increase or decrease the outlet end pressure of the hydraulic pump station, so that the hydraulic cylinder pressure meets the cylinder pressure threshold requirement, and then S3.2 is entered; if it is within the threshold range, S3.2 is directly entered.

[0025] S3.2, the controller checks whether the average value of the temperature collected by the temperature sensor installed on the metal thin-walled plate is within the thin-walled plate temperature threshold ± 0.5℃ range; if it is within the threshold range, S3.3 is directly entered.

[0026] If it is not within the threshold range, the control system is adjusted to increase or decrease the opening of the servo valve: when the average value of the collected temperature is less than the thin-walled plate temperature threshold, the opening of the servo valve group is increased so that the measured temperature meets the thin-walled plate temperature threshold requirement, and then S3.3 is entered; when the average value of the collected temperature is greater than the thin-walled plate temperature threshold, the opening of the servo valve group is decreased so that the measured temperature meets the thin-walled plate temperature threshold requirement, and then S3.3 is entered.

[0027] S3.3, check whether each oil cylinder displacement sensor is within the corresponding oil cylinder displacement threshold ± 5mm, if the hydraulic oil cylinder displacement parameter is not within the oil cylinder displacement threshold range, adjust the proportional gain parameter in the outlet flame temperature PID feedback adjustment model:

[0028] If the oil cylinder displacement is less than the corresponding oil cylinder displacement threshold, increase the proportional gain parameter by a certain amplitude until all oil cylinder displacements meet the set oil cylinder displacement threshold requirement, at which time the outlet flame temperature precision control is completed;

[0029] If the oil cylinder displacement is greater than the corresponding oil cylinder displacement threshold, decrease the proportional gain parameter by a certain amplitude until all oil cylinder displacements meet the set oil cylinder displacement threshold requirement, at which time the outlet flame temperature precision control is completed;

[0030] If both are within the range, directly determine that the outlet flame temperature precision control is completed;

[0031] Return to S2.2 to continue monitoring the flame temperature precision and the flame temperature stability.

[0032] The S4, the outlet flame temperature stability control of the hydraulic regulating experimental device, comprises the following contents:

[0033] S4.1, check whether the average value of the deformation of all deformation sensors is within the thin-walled plate deformation threshold ± 50με, if the average value of the deformation is within the thin-walled plate deformation threshold range, directly enter S4.2;

[0034] If the average value of the deformation is greater than the thin-walled plate deformation threshold range, decrease the integral gain parameter by a certain amplitude until the average value of the deformation meets the thin-walled plate deformation threshold range, and enter S4.2;

[0035] If the average value of the deformation is less than the thin-walled plate deformation threshold range, increase the differential gain parameter by a certain amplitude until the average value of the deformation meets the thin-walled plate deformation threshold range, and enter S4.2;

[0036] S4.2, check whether the average value of the acceleration collected by all acceleration sensors is within the thin-walled plate acceleration threshold ± 0.02g, if it is within the thin-walled plate acceleration threshold range, directly enter S4.3;

[0037] If it is not within the threshold range, adjust the control system to increase or decrease the servo valve opening:

[0038] When the average value of the collected acceleration is less than the thin-walled plate acceleration threshold, increase the opening of the servo valve group so that the measured temperature meets the thin-walled plate acceleration threshold requirement and enters S4.3; when the average value of the collected acceleration is greater than the thin-walled plate acceleration threshold, decrease the opening of the servo valve group so that the measured acceleration meets the thin-walled plate temperature threshold requirement and enters S4.3;

[0039] S4.3, check whether the displacement rate of change of each oil cylinder is within the oil cylinder displacement rate of change threshold value ± 0.6mm / 50ms,

[0040] If the displacement rate of change of the oil cylinder is greater than the oil cylinder displacement rate of change threshold value range, the integral gain parameter is reduced by a certain amplitude until the displacement rate of change of the oil cylinder meets the oil cylinder displacement rate of change threshold value range, and the outlet flame temperature stability control is completed.

[0041] If the displacement rate of change of the oil cylinder is less than the oil cylinder displacement rate of change threshold value range, the differential gain parameter is increased by a certain amplitude until the displacement rate of change of the oil cylinder meets the oil cylinder displacement rate of change threshold value range, and the outlet flame temperature stability control is completed.

[0042] If the displacement rate of change of all oil cylinders meets the oil cylinder displacement rate of change threshold value requirement, the outlet flame temperature stability control is completed.

[0043] Return to S2.2 to continue monitoring the flame temperature precision and the flame temperature stability.

[0044] Compared with the prior art, the beneficial effects of the present application are:

[0045] 1、The engine tail flame injection port flame hydraulic regulation experimental device in the application utilizes the lifting control of the oil cylinder to control the deformation of the metal thin-walled plate, so that various required shapes are simulated for tail flame injection experiments. In the tail flame injection process, the metal thin-walled plate is in a high-temperature environment, and its hardness is reduced and flexibility is enhanced, which is more conducive to its deformation. Therefore, the experimental device structure of the design is reasonable, and can meet different experimental requirements.

[0046] 2、The engine tail flame injection port flame hydraulic regulation experimental device in the application connects the hydraulic oil cylinder and the metal thin-walled plate through a universal bearing, so that the connecting metal thin-walled plate is smoother, the reliability of the equipment is improved, and multiple sensors are installed at the hydraulic oil cylinder and the metal thin-walled plate, which provides a basis for the equipment to realize PID feedback regulation. Therefore, the design has high reliability and is convenient for realizing PID feedback control.

[0047] 3、The control method of the engine tail flame injection port flame hydraulic regulation experimental device in the application realizes the stable change of the temperature of the flame outlet of the flame hydraulic regulation experimental device through feedback regulation PID control, effectively controls the precision of the outlet temperature and the stability of the outlet temperature rate of change, so as to meet the requirements of accurate control of the experiment. Therefore, the design can ensure the steady state of the experiment, and effectively improve the experimental precision and experimental efficiency.

[0048] 4. The control method for the experimental device for hydraulic pressure regulation of an engine tail flame jet port, utilizing multi-directional sensor monitoring of the device, ensures a stable operating environment for the hydraulic equipment to the greatest extent possible, optimizing the equipment's operating environment and effectively preventing equipment failures caused by extreme operating environments. This effectively reduces the failure rate and extends the equipment's service life. Therefore, this design optimizes the hydraulic equipment's operating environment and effectively extends its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a structural schematic diagram of the present invention.

[0050] Figure 2 It is a schematic diagram of the PID control model in the control method of the present invention.

[0051] In the figure: engine tail flame injection port 1, flame adjustment device 2, metal thin-walled plate 21, universal bearing 22, flame detection device 3, hydraulic cylinder 4. DETAILED DESCRIPTION

[0052] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] See also Figure 1 , an engine tail flame injection port flame hydraulic adjustment experimental device, comprising: an engine tail flame injection port 1, a flame adjustment device 2, and a flame detection device 3. The engine tail flame injection port 1 is arranged opposite to the inlet end of the flame adjustment device, and the outlet end of the flame adjustment device 2 is provided with the flame detection device 3; adjustable metal thin-walled plates 21 are relatively arranged in the flame adjustment device 2, and the area between the two metal thin-walled plates 21 is the tail flame injection area. Each of the metal thin-walled plates 21 is fixed to the inside of the flame adjustment device 2 by three hydraulic cylinders 4. When the engine tail flame injection port 1 ejects the tail flame, the metal thin-walled plate 21 is deformed as the three hydraulic cylinders 4 rise and fall.

[0054] The piston rod end of the hydraulic cylinder 4 is connected to the outer wall of the metal thin-walled plate 21 through a universal bearing 22 , and the cylinder seat of the hydraulic cylinder 4 is fixed on a bracket inside the flame adjustment device 2 .

[0055] The oil circuit of each hydraulic cylinder 4 is connected to the hydraulic pump station through a servo valve group, and the control ends of the servo valve group and the hydraulic pump station are respectively connected to corresponding control signal output ends on the controller.

[0056] Each of the hydraulic cylinders 4 is provided with a displacement sensor and a pressure sensor, and each of the connections between the universal bearing 22 and the metal thin-walled plate 21 is provided with a deformation sensor, an acceleration sensor and a temperature sensor;

[0057] The signal output ends of the displacement sensor, pressure sensor, deformation sensor, acceleration sensor and temperature sensor are connected to the corresponding feedback signal input ends of the controller.

[0058] The outlet temperature sensor is arranged in the flame detection device 3, and the signal output end of the outlet temperature sensor is connected to the corresponding feedback signal input end of the controller.

[0059] A control method of an engine exhaust flame injection port flame hydraulic regulation experiment device, comprising the following steps:

[0060] S1, preliminary setting of threshold value:

[0061] When the hydraulic regulation experiment device is working, the hydraulic cylinder 4 is controlled by adjusting the opening of the servo valve group and the pressure of the hydraulic pump station, so as to change the shape of the metal thin-walled plate 21 and achieve the purpose of regulating the outlet temperature; the change requirements of the engine exhaust flame injection port 1 are known, and the requirements of the set outlet temperature change and the set outlet temperature change rate of the outlet end of the flame regulation device 2 are known, the corresponding cylinder pressure threshold value, thin-walled plate temperature threshold value, thin-walled plate deformation threshold value, thin-walled plate acceleration threshold value, each cylinder displacement threshold value and the change requirements of the cylinder displacement change rate threshold value are obtained according to the known requirements, and an outlet flame temperature PID feedback regulation model is constructed, and the proportional gain parameter, integral gain parameter and differential gain parameter are set;

[0062] Then the above setting threshold value requirements and the outlet flame temperature PID feedback regulation model are imported into the controller, and then S2 is entered;

[0063] S2, ignition experiment:

[0064] S2.1 After the controller imports the setting requirements, the engine is ignited, and the engine exhaust flame injection port 1 sprays flame;

[0065] S2.2 The controller collects the temperature signal output by the flame detection device 3 in real time, and monitors the temperature accuracy and temperature stability of the outlet flame respectively, when the outlet flame detection device 3 detects that the outlet flame temperature exceeds the set outlet temperature threshold value ± 2℃, S3 is entered; when the outlet flame detection device 3 detects that the outlet flame temperature change rate exceeds the set outlet temperature change rate threshold value ± 0.8℃ / 50ms, S4 is entered;

[0066] S2.3 When the experiment is completed, the engine is turned off, the controller controls the hydraulic cylinder to move to adjust the shape of the metal thin-walled plate 21 to the initial ignition shape, and then the controller stops monitoring;

[0067] S3, outlet flame temperature accuracy control of the hydraulic regulation experiment device:

[0068] When the outlet flame detection device detects that the outlet flame temperature exceeds the set outlet temperature threshold ± 2℃, first, the average value of the hydraulic cylinder rod cavity pressure is controlled to reach the cylinder pressure threshold range by adjusting the outlet end pressure of the hydraulic pump station; then, the average value of the collected temperature on the metal thin plate 21 is controlled to reach the thin plate temperature threshold range by adjusting the opening of the servo valve group; finally, the displacement of all cylinders is controlled to meet the set cylinder displacement threshold requirement by adjusting the proportional gain parameter, and after all adjustments are completed, the flame temperature precision and the flame temperature stability are monitored in S2.2 again;

[0069] S4, outlet flame temperature stability control of the hydraulic adjustment experimental device:

[0070] When the outlet flame detection device detects whether the outlet flame temperature rate of change exceeds the set outlet flame temperature rate of change threshold ± 0.8℃ / 50ms, first, the average value of the deformation is controlled to reach the thin plate deformation threshold range by adjusting the differential gain parameter and the integral gain parameter; then, the average value of the acceleration is controlled to reach the thin plate acceleration threshold range by adjusting the opening of the servo valve group; finally, the displacement rate of change of all cylinders is controlled to meet the cylinder displacement rate of change threshold requirement by adjusting the differential gain parameter and the integral gain parameter, and then the outlet flame temperature stability control is completed; the flame temperature precision and the flame temperature stability are monitored in S2.2 again.

[0071] In the S3 outlet flame temperature precision control of the hydraulic adjustment experimental device, the following contents are included:

[0072] S3.1, the controller checks whether the average value of the pressure collected by the pressure sensor of all hydraulic cylinders is within the cylinder pressure threshold ± 0.1MPa range; if not, the control system is adjusted to increase or decrease the outlet end pressure of the hydraulic pump station, so that the hydraulic cylinder pressure meets the cylinder pressure threshold requirement, and then S3.2 is entered; if it is within the threshold range, it is directly entered into S3.2;

[0073] S3.2, the controller checks whether the average value of the temperature collected by the temperature sensor installed on the metal thin plate 21 is within the thin plate temperature threshold ± 0.5℃ range; if it is within the threshold range, it is directly entered into S3.3;

[0074] If it is not within the threshold range, the control system is adjusted to increase or decrease the opening of the servo valve: when the average value of the collected temperature is less than the thin plate temperature threshold, the opening of the servo valve group is increased so that the measured temperature meets the thin plate temperature threshold requirement, and then S3.3 is entered; when the average value of the collected temperature is greater than the thin plate temperature threshold, the opening of the servo valve group is decreased so that the measured temperature meets the thin plate temperature threshold requirement, and then S3.3 is entered;

[0075] S3.3, check whether each oil cylinder displacement sensor is within the corresponding oil cylinder displacement threshold ± 5mm, if the hydraulic oil cylinder displacement parameter is not within the oil cylinder displacement threshold range, adjust the proportional gain parameter in the outlet flame temperature PID feedback adjustment model:

[0076] If the oil cylinder displacement is less than the corresponding oil cylinder displacement threshold, increase the proportional gain parameter by a certain amplitude until all oil cylinder displacements meet the set oil cylinder displacement threshold requirement, at which time the outlet flame temperature precision control is completed;

[0077] If the oil cylinder displacement is greater than the corresponding oil cylinder displacement threshold, decrease the proportional gain parameter by a certain amplitude until all oil cylinder displacements meet the set oil cylinder displacement threshold requirement, at which time the outlet flame temperature precision control is completed;

[0078] If both are within the range, directly determine that the outlet flame temperature precision control is completed;

[0079] Return to S2.2 to continue monitoring the flame temperature precision and the flame temperature stability.

[0080] The S4, the outlet flame temperature stability control in the hydraulic regulating experiment device, includes the following contents:

[0081] S4.1, check whether the average value of the deformation of all deformation sensors is within the thin-walled plate deformation threshold ± 50με, if the average value of the deformation is within the thin-walled plate deformation threshold range, directly enter S4.2;

[0082] If the average value of the deformation is greater than the thin-walled plate deformation threshold range, decrease the integral gain parameter by a certain amplitude until the average value of the deformation meets the thin-walled plate deformation threshold range, enter S4.2;

[0083] If the average value of the deformation is less than the thin-walled plate deformation threshold range, increase the differential gain parameter by a certain amplitude until the average value of the deformation meets the thin-walled plate deformation threshold range, enter S4.2;

[0084] S4.2, check whether the average value of the acceleration collected by all acceleration sensors is within the thin-walled plate acceleration threshold ± 0.02g, if it is within the thin-walled plate acceleration threshold range, directly enter S4.3;

[0085] If it is not within the threshold range, adjust the control system to increase or decrease the servo valve opening:

[0086] When the average value of the collected acceleration is less than the thin-walled plate acceleration threshold, increase the opening of the servo valve group so that the measured temperature meets the thin-walled plate acceleration threshold requirement and enters S4.3; when the average value of the collected acceleration is greater than the thin-walled plate acceleration threshold, decrease the opening of the servo valve group so that the measured acceleration meets the thin-walled plate temperature threshold requirement and enters S4.3;

[0087] S4.3, check whether the displacement rate of each oil cylinder is within the oil cylinder displacement rate threshold ± 0.6 mm / 50 ms,

[0088] If the displacement rate of the oil cylinder is greater than the oil cylinder displacement rate threshold range, the integral gain parameter is reduced by a certain amplitude until the displacement rate of the oil cylinder meets the oil cylinder displacement rate threshold range, and the outlet flame temperature stability control is completed.

[0089] If the displacement rate of the oil cylinder is less than the oil cylinder displacement rate threshold range, the differential gain parameter is increased by a certain amplitude until the displacement rate of the oil cylinder meets the oil cylinder displacement rate threshold range, and the outlet flame temperature stability control is completed.

[0090] If the displacement rates of all oil cylinders meet the oil cylinder displacement rate threshold requirement, the outlet flame temperature stability control is completed.

[0091] Return to S2.2 to continue monitoring the flame temperature precision and the flame temperature stability.

[0092] The principles of the present application are described as follows:

[0093] The average value in the method of the present application is obtained by averaging the real-time values collected by the sensor.

[0094] Embodiment 1:

[0095] An engine exhaust flame injection port flame hydraulic adjusting experimental device, comprising: an engine exhaust flame injection port 1, a flame adjusting device 2, and a flame detection device 3, wherein the engine exhaust flame injection port 1 is arranged opposite to the inlet end of the flame adjusting device 2, the outlet end of the flame adjusting device 2 is provided with the flame detection device 3; the flame adjusting device 2 is relatively provided with an adjustable metal thin plate 21, the area between the two metal thin plates 21 is the exhaust flame injection area, each metal thin plate 21 is fixed in the flame adjusting device 2 by three hydraulic cylinders 4, and the metal thin plate 21 deforms along with the lifting of the three hydraulic cylinders 4 when the engine exhaust flame injection port 1 injects the exhaust flame.

[0096] The oil circuit of each hydraulic cylinder 4 is communicated with a hydraulic pump station through a servo valve group, and the control ends of the servo valve group and the hydraulic pump station are respectively communicated with the corresponding control signal output ends on the controller.

[0097] A displacement sensor and a pressure sensor are arranged in each hydraulic cylinder 4, and a deformation sensor, an acceleration sensor, and a temperature sensor are installed at the connection between each universal bearing 22 and the metal thin plate 21.

[0098] The signal output ends of the displacement sensor, pressure sensor, deformation sensor, acceleration sensor and temperature sensor are connected in communication with corresponding feedback signal input ends on the controller.

[0099] An outlet temperature sensor is arranged in the flame detection device 3; the signal output end of the outlet temperature sensor is connected in communication with a corresponding feedback signal input end on the controller.

[0100] A control method of an engine exhaust flame injection port flame hydraulic regulation experimental device, comprising the following steps:

[0101] S1, preliminary setting of threshold value:

[0102] When the hydraulic regulation experimental device is working, the hydraulic cylinder 4 is controlled by adjusting the opening of the servo valve group and the pressure of the hydraulic pump station, and then the shape of the metal thin-walled plate 21 is changed to achieve the purpose of regulating the outlet temperature; the change requirements of the engine exhaust flame injection port 1 are known during the experiment, and the requirements of the set outlet temperature change and the set outlet temperature change rate of the outlet end of the flame regulation device 2 are known, the corresponding cylinder pressure threshold value, thin-walled plate temperature threshold value, thin-walled plate deformation threshold value, thin-walled plate acceleration threshold value, each cylinder displacement threshold value and the change requirements of the cylinder displacement change rate threshold value are obtained according to the known requirements, and an outlet flame temperature PID feedback regulation model is constructed, and the proportional gain parameter, integral gain parameter and differential gain parameter are set;

[0103] Then the above setting threshold value requirements and the outlet flame temperature PID feedback regulation model are imported into the controller, and then S2 is entered;

[0104] S2, ignition experiment:

[0105] S2.1 After the controller imports the setting requirements, the engine is ignited, and the engine exhaust flame injection port 1 sprays flame;

[0106] S2.2 The controller collects the temperature signal output by the flame detection device 3 in real time, and monitors the temperature accuracy and temperature stability of the outlet flame respectively, when the outlet flame detection device 3 detects that the outlet flame temperature exceeds the set outlet temperature threshold value ± 2℃, S3 is entered; when the outlet flame detection device 3 detects that the outlet flame temperature change rate exceeds the set outlet temperature change rate threshold value ± 0.8℃ / 50ms, S4 is entered;

[0107] S2.3 When the experiment is completed, the engine is turned off, the controller controls the hydraulic cylinder to move to adjust the shape of the metal thin-walled plate 21 to the initial ignition shape, and then the controller stops monitoring;

[0108] S3, outlet flame temperature accuracy control of the hydraulic regulation experimental device:

[0109] When the outlet flame detection device detects that the outlet flame temperature exceeds the set outlet temperature threshold ± 2℃, first, the average value of the hydraulic cylinder rod cavity pressure is controlled to reach the cylinder pressure threshold range by adjusting the outlet end pressure of the hydraulic pump station; then, the average value of the collected temperature on the metal thin-walled plate 21 is controlled to reach the thin-walled plate temperature threshold range by adjusting the opening of the servo valve group; finally, the displacement of all the cylinders is controlled to meet the set cylinder displacement threshold requirement by adjusting the proportional gain parameter, and after all the adjustments are completed, the flame temperature precision and the flame temperature stability are continued to be monitored in S2.2.

[0110] S4, outlet flame temperature stability control of the hydraulic adjustment experimental device:

[0111] When the outlet flame detection device detects whether the outlet flame temperature rate of change exceeds the set outlet flame temperature rate of change threshold ± 0.8℃ / 50ms, first, the average value of the deformation is controlled to reach the thin-walled plate deformation threshold range by adjusting the differential gain parameter and the integral gain parameter; then, the average value of the acceleration is controlled to reach the thin-walled plate acceleration threshold range by adjusting the opening of the servo valve group; finally, the displacement rate of change of all the cylinders is controlled to meet the cylinder displacement rate of change threshold requirement by adjusting the differential gain parameter and the integral gain parameter, and then the outlet flame temperature stability control is completed; the flame temperature precision and the flame temperature stability are continued to be monitored in S2.2.

[0112] Example 2:

[0113] Example 2 is basically the same as Example 1, and the difference is that:

[0114] The piston rod end of the hydraulic cylinder 4 is connected to the outer side wall of the metal thin-walled plate 21 through a universal bearing 22, and the cylinder seat of the hydraulic cylinder 4 is fixed to the bracket inside the flame adjustment device 2.

[0115] In the outlet flame temperature precision control of the S3 hydraulic adjustment experimental device, the following contents are included:

[0116] S3.1, the controller checks whether the average value of the pressure collected by the pressure sensor of the rod cavity of all the cylinders is within the cylinder pressure threshold ± 0.1MPa range; if not, the control system is adjusted to increase or decrease the outlet end pressure of the hydraulic pump station, so that the hydraulic cylinder pressure meets the cylinder pressure threshold requirement and enters S3.2; if it is within the threshold range, it directly enters S3.2;

[0117] S3.2, the controller checks whether the average value of the temperature collected by the temperature sensor installed on the metal thin-walled plate 21 is within the thin-walled plate temperature threshold ± 0.5℃ range, if it is within the threshold range, it directly enters S3.3;

[0118] If not in the threshold range, adjust the control system to increase or decrease the servo valve opening: when the average value of the collected temperature is less than the thin-walled plate temperature threshold, the opening of the servo valve group is increased, and when the measured temperature meets the thin-walled plate temperature threshold requirement, it enters S3.3; when the average value of the collected temperature is greater than the thin-walled plate temperature threshold, the opening of the servo valve group is reduced, and when the measured temperature meets the thin-walled plate temperature threshold requirement, it enters S3.3;

[0119] S3.3, check whether each oil cylinder displacement sensor is within the corresponding oil cylinder displacement threshold ±5mm range, if the displacement parameter of the hydraulic oil cylinder is not within the oil cylinder displacement threshold range, adjust the proportional gain parameter in the outlet flame temperature PID feedback adjustment model:

[0120] If the oil cylinder displacement is less than the corresponding oil cylinder displacement threshold, the proportional gain parameter is increased by a certain amplitude until all oil cylinder displacements meet the set oil cylinder displacement threshold requirement, at which time the outlet flame temperature precision control is completed;

[0121] If the oil cylinder displacement is greater than the corresponding oil cylinder displacement threshold, the proportional gain parameter is reduced by a certain amplitude until all oil cylinder displacements meet the set oil cylinder displacement threshold requirement, at which time the outlet flame temperature precision control is completed;

[0122] If they are all within the range, it is directly determined that the outlet flame temperature precision control is completed;

[0123] Return to S2.2 to continue monitoring the flame temperature precision and the flame temperature stability.

[0124] The S4, the outlet flame temperature stability control of the hydraulic regulating experimental device, includes the following contents:

[0125] S4.1, check whether the average value of the deformation of all deformation sensors is within the thin-walled plate deformation threshold ±50με range, if the average value of the deformation is within the thin-walled plate deformation threshold range, directly enter S4.2;

[0126] If the average value of the deformation is greater than the thin-walled plate deformation threshold range, the integral gain parameter is reduced by a certain amplitude until the average value of the deformation meets the thin-walled plate deformation threshold range, and enters S4.2;

[0127] If the average value of the deformation is less than the thin-walled plate deformation threshold range, the differential gain parameter is increased by a certain amplitude until the average value of the deformation meets the thin-walled plate deformation threshold range, and enters S4.2;

[0128] S4.2, check whether the average value of the acceleration collected by all acceleration sensors is within the thin-walled plate acceleration threshold ±0.02g range, if it is within the thin-walled plate acceleration threshold range, directly enter S4.3;

[0129] If it is not within the threshold range, adjust the control system to increase or decrease the servo valve opening:

[0130] When the average value of the collected acceleration is less than the thin-walled plate acceleration threshold, the servo valve group opening is increased until the measured temperature meets the thin-walled plate acceleration threshold, and then the process enters S4.3. When the average value of the collected acceleration is greater than the thin-walled plate acceleration threshold, the servo valve group opening is decreased until the measured acceleration meets the thin-walled plate temperature threshold, and then the process enters S4.3.

[0131] S4.3. Check whether the displacement change rate of each oil cylinder displacement sensor is within the range of the oil cylinder displacement change rate threshold ±0.6mm / 50ms.

[0132] If the displacement change rate of a cylinder is greater than the cylinder displacement change rate threshold range, the integral gain parameter is reduced by a certain amount until the displacement change rate of the cylinder meets the cylinder displacement change rate threshold range, and the outlet flame temperature stability control is completed;

[0133] If the displacement change rate of a cylinder is less than the cylinder displacement change rate threshold range, the differential gain parameter is increased by a certain amplitude until the displacement change rate of the cylinder meets the cylinder displacement change rate threshold range, and the outlet flame temperature stability control is completed;

[0134] If the displacement change rates of all cylinders meet the cylinder displacement change rate threshold requirements, the outlet flame temperature stability control is completed;

[0135] Return to S2.2 to continue monitoring the flame temperature accuracy and flame temperature stability.

Claims

1. An experimental device for hydraulic pressure regulation of flame at the tail flame jet of an engine, characterized by: include: An engine tail flame injection port (1), a flame regulating device (2), and a flame detection device (3), wherein the engine tail flame injection port (1) is arranged opposite to the inlet end of the flame regulating device (2), and the outlet end of the flame regulating device (2) is provided with a flame detection device (3); adjustable metal thin-walled plates (21) are arranged relatively in the flame regulating device (2), and the area between the two metal thin-walled plates (21) is the tail flame injection area, and each of the metal thin-walled plates (21) is fixed to the inside of the flame regulating device (2) through three hydraulic cylinders (4); when the engine tail flame injection port (1) injects the tail flame, the metal thin-walled plates (21) are deformed as the three hydraulic cylinders (4) rise and fall, and the cylinder seats of the hydraulic cylinders (4) are fixed to the bracket inside the flame regulating device (2); The piston rod end of the hydraulic cylinder (4) is connected to the outer wall of the metal thin-walled plate (21) through a universal bearing (22), a displacement sensor and a pressure sensor are provided in each hydraulic cylinder (4), and a deformation sensor, an acceleration sensor and a temperature sensor are installed at the connection between each universal bearing (22) and the metal thin-walled plate (21); The signal output ends of the displacement sensor, pressure sensor, deformation sensor, acceleration sensor and temperature sensor are all connected to the corresponding feedback signal input ends on the controller.

2. The engine tail flame jet hydraulic pressure adjustment experimental device according to claim 1, characterized in that: The oil circuit of each hydraulic cylinder (4) is connected to the hydraulic pump station through a servo valve group, and the control ends of the servo valve group and the hydraulic pump station are respectively connected to corresponding control signal output ends on the controller.

3. The engine tail flame jet hydraulic pressure adjustment experimental device according to claim 1 or 2, characterized in that: An outlet temperature sensor is provided in the flame detection device (3); a signal output terminal of the outlet temperature sensor is connected to a corresponding feedback signal input terminal on the controller.

4. A control method for an engine tail flame injection port flame hydraulic adjustment experimental device according to any one of claims 1 to 3, characterized in that: The steps include: S1. Preliminary setting of threshold: When the hydraulic regulating experimental device is in operation, the hydraulic cylinder (4) is controlled by adjusting the opening of the servo valve group and the pressure of the hydraulic pump station, thereby changing the shape of the metal thin-walled plate (21) to achieve the purpose of regulating the outlet temperature; the jet flame change requirement of the engine tail flame jet port (1) during the experiment is known, and the set outlet temperature change requirement and the set outlet temperature change rate requirement that need to be achieved at the outlet end of the flame regulating device (2) are also known. According to the known requirements, the corresponding cylinder pressure threshold, thin-walled plate temperature threshold, thin-walled plate deformation threshold, thin-walled plate acceleration threshold, each cylinder displacement threshold and cylinder displacement change rate threshold are obtained, and an outlet flame temperature PID feedback regulation model is constructed, and the proportional gain parameter, integral gain parameter and differential gain parameter are set; Then the threshold requirement and outlet flame temperature PID feedback regulation model are imported into the controller and then enter S2; S2. Ignition test: After the S2.1 controller imports the setting requirements, the engine ignites and the engine tail flame ejection port (1) ejects flames; The S2.2 controller collects the temperature signal output by the flame detection device (3) in real time, and monitors the temperature accuracy and temperature stability of the outlet flame respectively. When the outlet flame detection device (3) detects that the outlet flame temperature exceeds the set outlet temperature threshold value of ±2°C, it enters S3; when the outlet flame detection device (3) detects that the outlet flame temperature change rate exceeds the set outlet temperature change rate threshold value of ±0.8°C / 50ms, it enters S4; S2.3 When the experiment is completed and the engine is turned off, the controller controls the hydraulic cylinder to move and adjust the shape of the metal thin-walled plate (21) to the initial ignition shape, and then the controller stops monitoring; S3. Accuracy control of flame temperature at the outlet of hydraulic pressure regulating experimental device: When the outlet flame detection device detects that the outlet flame temperature exceeds the set outlet temperature threshold of ±2°C, firstly, the outlet pressure of the hydraulic pump station is adjusted to control the average pressure of the hydraulic cylinder rod chamber to reach the cylinder pressure threshold range; then, the opening of the servo valve group is adjusted to control the average temperature collected on the metal thin-walled plate (21) to reach the thin-walled plate temperature threshold range; finally, the proportional gain parameter is adjusted to control the displacement of all cylinders to meet the set cylinder displacement threshold requirement. After all adjustments are completed, return to S2.2 to continue monitoring the flame temperature accuracy and flame temperature stability; S4. Hydraulic adjustment test device outlet flame temperature stability control: When the outlet flame detection device detects whether the outlet flame temperature change rate exceeds the set outlet flame temperature change rate threshold of ±0.8℃ / 50ms, the differential gain parameter and the integral gain parameter are first adjusted to control the average value of the deformation to reach the thin-walled plate deformation threshold range; then the opening of the servo valve group is adjusted to control the average acceleration to reach the thin-walled plate acceleration threshold range; finally, the differential gain parameter and the integral gain parameter are adjusted to control the displacement change rate of all cylinders to meet the cylinder displacement change rate threshold requirement, and the outlet flame temperature stability control is completed; return to S2.2 to continue monitoring the flame temperature accuracy and flame temperature stability.

5. The control method of the engine tail flame injection port flame hydraulic adjustment experimental device according to claim 4 is characterized in that: The S3 hydraulic pressure adjustment experimental device outlet flame temperature precision control includes the following contents: S3.1: The controller checks whether the average pressure collected by the rod cavity pressure sensors of all cylinders is within the cylinder pressure threshold ±0.1 MPa. If not, the control system adjusts to increase or decrease the pressure at the hydraulic pump station outlet so that the hydraulic cylinder pressure meets the cylinder pressure threshold and then proceeds to S3.

2. If within the threshold, the controller directly proceeds to S3.

2. S3.2, the controller checks whether the average value of the temperature collected by all temperature sensors installed on the metal thin-walled plate (21) is within the range of ±0.5°C of the thin-walled plate temperature threshold. If it is within the threshold range, it directly enters S3.3; If it is not within the threshold range, the control system is adjusted to increase or decrease the servo valve opening: when the average value of the collected temperature is less than the thin-walled plate temperature threshold, the servo valve group opening is increased so that the measured temperature meets the thin-walled plate temperature threshold and then enters S3.3; when the average value of the collected temperature is greater than the thin-walled plate temperature threshold, the servo valve group opening is reduced so that the measured temperature meets the thin-walled plate temperature threshold and then enters S3.3; S3.

3. Check whether the displacement sensor of each cylinder is within the range of ±5mm of the corresponding cylinder displacement threshold. If the displacement parameter of the hydraulic cylinder is not within the cylinder displacement threshold range, adjust the proportional gain parameter in the outlet flame temperature PID feedback adjustment model: If the cylinder displacement is less than the corresponding cylinder displacement threshold, the proportional gain parameter is increased by a certain amplitude until the displacement of all cylinders meets the set cylinder displacement threshold requirement. At this time, the outlet flame temperature accuracy control is completed; If the cylinder displacement is greater than the corresponding cylinder displacement threshold, the proportional gain parameter is reduced by a certain amount until all cylinder displacements meet the set cylinder displacement threshold requirement. At this time, the outlet flame temperature accuracy control is completed; If both are within the range, it is directly determined that the outlet flame temperature accuracy control is completed; Return to S2.2 to continue monitoring the flame temperature accuracy and flame temperature stability.

6. The control method of the engine tail flame injection port flame hydraulic adjustment experimental device according to claim 5, characterized in that: The S4, hydraulic pressure adjustment experimental device outlet flame temperature stability control, includes the following contents: S4.

1. Check whether the average value of the deformation variables of all deformation sensors is within the range of the thin-walled plate deformation threshold ±50με. If the average value of the deformation variables is within the range of the thin-walled plate deformation threshold, directly proceed to S4.

2. If the average value of the deformation variable is greater than the thin-walled plate deformation threshold range, the integral gain parameter is reduced by a certain amount until the average value of the deformation variable meets the thin-walled plate deformation threshold range, and then enter S4.2; If the average value of the deformation variable is less than the thin-walled plate deformation threshold range, the differential gain parameter is increased by a certain amount until the average value of the deformation variable meets the thin-walled plate deformation threshold range, and then enter S4.2; S4.

2. Check whether the average value of the acceleration collected by all acceleration sensors is within the range of the thin-wall plate acceleration threshold ±0.02g. If it is within the range of the thin-wall plate acceleration threshold, directly proceed to S4.

3. If it is not within the threshold range, adjust the control system to increase or decrease the servo valve opening: When the average value of the collected acceleration is less than the thin-walled plate acceleration threshold, the servo valve group opening is increased until the measured temperature meets the thin-walled plate acceleration threshold, and then the process enters S4.

3. When the average value of the collected acceleration is greater than the thin-walled plate acceleration threshold, the servo valve group opening is decreased until the measured acceleration meets the thin-walled plate temperature threshold, and then the process enters S4.

3. S4.

3. Check whether the displacement change rate of each oil cylinder displacement sensor is within the range of the oil cylinder displacement change rate threshold ±0.6mm / 50ms. If the displacement change rate of a cylinder is greater than the cylinder displacement change rate threshold range, the integral gain parameter is reduced by a certain amount until the displacement change rate of the cylinder meets the cylinder displacement change rate threshold range, and the outlet flame temperature stability control is completed; If the displacement change rate of a cylinder is less than the cylinder displacement change rate threshold range, the differential gain parameter is increased by a certain amplitude until the displacement change rate of the cylinder meets the cylinder displacement change rate threshold range, and the outlet flame temperature stability control is completed; If the displacement change rates of all cylinders meet the cylinder displacement change rate threshold requirements, the outlet flame temperature stability control is completed; Return to S2.2 to continue monitoring the flame temperature accuracy and flame temperature stability.

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