Combustion atmosphere simulation assembly and control method

Abstract

The invention belongs to the technical field of aerospace equipment, and particularly relates to a combustion atmosphere simulation assembly and a control method. The combustion atmosphere simulation assembly comprises a fuel gas generator system and a measurement and control system. The fuel gas generator system comprises a fuel gas generator, a fuel supply pipeline, an air supply pipeline and a cooling medium supply pipeline, a combustion chamber is formed in the fuel gas generator, and the fuel supply pipeline, the air supply pipeline and the cooling medium supply pipeline all communicate with the combustion chamber. The measurement and control system is connected with the fuel gas generator system and is configured to control the fuel supply pipeline, the air supply pipeline and the cooling medium supply pipeline so as to regulate and control the temperature and pressure in the combustion chamber. The combustion atmosphere simulation assembly can simulate and reduce the combustion atmosphere environment of the aviation gas turbine, and can be compatible with temperature control and pressure regulation functions so as to truly reduce the internal combustion environment of the aviation gas turbine.

Description

Technical Field

[0001] This application belongs to the technical field of aerospace equipment, and in particular relates to a combustion atmosphere simulation assembly and a control method. Background Art

[0002] In the field of aeroengines, the simulation of the combustion atmosphere of an aero-gas turbine is mainly achieved by induction heating or natural gas combustion in the prior art. Its core goal is to simulate the high-temperature and high-pressure combustion environment inside the aero-gas turbine, providing basic conditions for experimental research and equipment testing.

[0003] Although the induction heating method can quickly heat up and provide high temperature control accuracy and temperature load curves, it cannot generate combustion products (such as water vapor, carbon dioxide, etc.), so it is difficult to truly reproduce the chemical environment of the combustion atmosphere in the aero-gas turbine. In addition, the heat distribution uniformity of this method is poor, thus affecting the reliability of experimental results. Moreover, the induction heating method cannot directly simulate the high-pressure environment inside the aero-gas turbine.

[0004] Although the natural gas combustion method can generate high-temperature gases, due to its fuel characteristics, there are still differences between the generated combustion atmosphere and the actual combustion environment of the aero-gas turbine. For example, the combustion reaction rate and heat release rate of natural gas are significantly different from those of kerosene, which makes it difficult for the experimental results to fully correspond to the actual working conditions. In addition, since the heat released by the fuel during natural gas combustion is relatively constant, there are limitations in dynamic temperature control, and its temperature control system is difficult to maintain a stable temperature under rapidly changing experimental conditions. Moreover, although the natural gas combustion method can adjust the pressure by changing the air flow rate, the regulation accuracy is relatively low only by the air flow rate.

[0005] In summary, it can be seen that although the induction heating method can achieve high-precision temperature control, it is difficult to control the pressure. Although the natural gas combustion method has a certain ability to adjust the pressure, there are limitations in temperature control, that is, the existing methods are difficult to be compatible with the temperature control and pressure regulation functions to truly restore the high-temperature and high-pressure environment of the internal combustion of the aero-gas turbine, and both are difficult to reproduce the chemical environment of the combustion atmosphere in the aero-gas turbine. Summary of the Invention

[0006] This application provides a combustion atmosphere simulation assembly and a control method to solve the technical problems that the existing simulation methods of the combustion atmosphere of aero-gas turbines are difficult to restore the combustion atmosphere environment and are difficult to be compatible with the temperature control and pressure regulation functions to truly restore the internal combustion environment of the aero-gas turbine.

[0007] According to one aspect of the present application, a combustion atmosphere simulation assembly is provided, including a gas generator system and a measurement and control system. The gas generator system includes a gas generator, a fuel supply pipeline, an air supply pipeline, and a cooling medium supply pipeline. A combustion chamber is formed in the gas generator, and the fuel supply pipeline, the air supply pipeline, and the cooling medium supply pipeline are all connected to the combustion chamber. The measurement and control system is connected to the gas generator system and is configured to control the fuel supply pipeline, the air supply pipeline, and the cooling medium supply pipeline to regulate the temperature and pressure in the combustion chamber.

[0008] In an alternative embodiment of the present application, the fuel supply pipeline includes a fuel source and a fuel pump connected in sequence. The fuel pump is connected to the measurement and control system and is used to pump the fuel in the fuel source into the combustion chamber.

[0009] In an alternative embodiment of the present application, the fuel supply pipeline further includes a fuel flow regulating valve, which is disposed between the fuel pump and the gas generator; the fuel flow regulating valve is connected to the measurement and control system, and the measurement and control system is configured to control the valve opening of the fuel flow regulating valve and / or the rotational speed of the fuel pump to adjust the fuel flow rate entering the combustion chamber, thereby regulating the temperature in the combustion chamber.

[0010] In an alternative embodiment of the present application, the air supply pipeline includes an air source and an air flow regulating valve connected in sequence. The air provided by the air source enters the gas generator through the air flow regulating valve; the air flow regulating valve is connected to the measurement and control system, and the measurement and control system is configured to control the opening of the air flow regulating valve to adjust the air flow rate entering the combustion chamber.

[0011] In an alternative embodiment of the present application, the cooling medium supply pipeline includes a cooling medium source and a cooling medium flow regulating valve connected in sequence. The cooling medium provided by the cooling medium source enters the nozzle of the gas generator through the cooling medium flow regulating valve; the cooling medium flow regulating valve is connected to the measurement and control system, and the measurement and control system is configured to control the opening of the cooling medium flow regulating valve to adjust the throat area of the nozzle of the gas generator, thereby regulating the pressure in the combustion chamber.

[0012] In an alternative embodiment of the present application, a fatigue testing machine is further included. The fatigue testing machine is configured to apply a mechanical load to a sample located in the combustion chamber; the fatigue testing machine is connected to the measurement and control system, and the measurement and control system is configured to control the mechanical load applied by the fatigue testing machine to the sample.

[0013] According to another aspect of the present application, a combustion atmosphere simulation control method is provided, which is applied to the above combustion atmosphere simulation assembly and includes:

[0014] Obtain the preset target temperature, preset target pressure, preset target air flow rate, the actual temperature and actual pressure of the combustion chamber, the fuel pressure in the fuel supply pipeline, the actual air flow rate and air pressure in the air supply pipeline, and the cooling medium pressure in the cooling medium supply pipeline;

[0015] Regulate the valve opening of the air flow regulating valve in the air supply pipeline according to the preset target air flow rate, actual air flow rate and air pressure, so that the actual air flow rate reaches the preset target air flow rate;

[0016] Regulate the rotation speed of the fuel pump and / or the valve opening of the fuel flow regulating valve in the fuel supply pipeline according to the preset target temperature, actual temperature and fuel pressure, so that the temperature in the combustion chamber reaches the preset target temperature;

[0017] Regulate the valve opening of the cooling medium flow regulating valve in the cooling medium supply pipeline according to the preset target pressure, actual pressure and cooling medium pressure, so that the pressure in the combustion chamber reaches the preset target pressure.

[0018] In an alternative embodiment of the present application, regulating the valve opening of the air flow regulating valve in the air supply pipeline according to the preset target air flow rate, actual air flow rate and air pressure, so that the actual air flow rate reaches the preset target air flow rate, includes:

[0019] Based on the PID algorithm and according to the preset target air flow rate and actual air flow rate, obtain the change amount of the valve opening of the air flow regulating valve;

[0020] Adjust and correct the change amount of the valve opening of the air flow regulating valve according to the air pressure to obtain the corrected change amount of the valve opening of the air flow regulating valve, so as to regulate the valve opening of the air flow regulating valve.

[0021] In an alternative embodiment of the present application, regulating the rotation speed of the fuel pump and / or the valve opening of the fuel flow regulating valve in the fuel supply pipeline according to the preset target temperature, actual temperature and fuel pressure, so that the temperature in the combustion chamber reaches the preset target temperature, includes:

[0022] Based on the PID algorithm and according to the preset target temperature and actual temperature, obtain the change amount of the valve opening of the fuel flow regulating valve;

[0023] Correct the change amount of the valve opening of the fuel flow regulating valve according to the fuel pressure to obtain the corrected change amount of the valve opening of the fuel flow regulating valve, so as to regulate the valve opening of the fuel flow regulating valve.

[0024] In an alternative embodiment of the present application, regulating the valve opening of the cooling medium flow regulating valve in the cooling medium supply pipeline according to the preset target pressure, actual pressure and cooling medium pressure, so that the pressure in the combustion chamber reaches the preset target pressure, includes:

[0025] Based on the PID algorithm, the change amount of the valve opening of the cooling medium flow regulating valve is obtained according to the preset target pressure and the actual pressure;

[0026] The change amount of the valve opening of the cooling medium flow regulating valve is corrected according to the cooling medium pressure to obtain the corrected change amount of the valve opening of the cooling medium flow regulating valve, so as to regulate the valve opening of the cooling medium flow regulating valve.

[0027] In summary, the combustion atmosphere simulation assembly and control method provided by the present application at least have the following beneficial effects:

[0028] The fuel supplied by the fuel supply pipeline in the combustion atmosphere simulation assembly is the fuel used by an aero gas turbine, generally kerosene. Compared with the induction heating method and the natural gas combustion method, it can better reproduce the real combustion atmosphere environment in the aero gas turbine, significantly improving the reliability of the simulation results. In addition, the fuel supply pipeline, the air supply pipeline, and the cooling medium supply pipeline are controlled by the measurement and control system to adjust the fuel supply flow rate, the air supply flow rate, and the cooling medium supply flow rate, so that the temperature and pressure in the combustion chamber reach the preset target values, realizing automatic regulation of the temperature and pressure in the combustion chamber, that is, the combustion atmosphere simulation assembly can compatibly adjust the temperature and pressure in the combustion chamber R.

[0029] Furthermore, the fuel flow rate and the air flow rate are independently regulated by the PID control strategy. The dynamic control of the temperature takes the target combustion chamber temperature as the input, and can adjust the fuel pump speed and the air valve opening as the output, realizing precise temperature regulation ability and meeting the requirements of complex temperature load spectrum experiments.

[0030] The PID control is used to control the cooling medium flow rate to achieve precise regulation of the combustion chamber pressure. Different from the prior art, the present invention dynamically adjusts the effective nozzle throat area by using the cooling medium, which can not only quickly respond to the pressure change requirements, but also significantly improve the pressure control accuracy, filling the gap that the induction heating technology cannot simulate the real pressure environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 FIG. is a block diagram of the composition of a combustion atmosphere simulation assembly provided according to one embodiment of the present application;

[0033] Figure 2 Schematic diagram of the connection relationship of the combustion atmosphere simulation assembly provided according to one embodiment of the present application;

[0034] Figure 3 is Figure 2 Cross-sectional view of the gas generator in

[0035] Figure 4 Flow chart of steps of the combustion atmosphere simulation control method provided according to one embodiment of the present application;

[0036] Figure 5 Flow chart of air flow control provided according to one embodiment of the present application;

[0037] Figure 6 Flow chart of temperature control provided according to one embodiment of the present application;

[0038] Figure 7 Flow chart of temperature control provided according to another embodiment of the present application;

[0039] Figure 8 Flow chart of pressure control provided according to one embodiment of the present application.

[0040] Reference numerals are as follows:

[0041] 100, combustion atmosphere simulation assembly;

[0042] 10, gas generator system; 11, gas generator; 111, housing assembly; 112, atomizing nozzle; 113, igniter; 114, cooling nozzle structure; 115, sensor; R, combustion chamber;

[0043] 12, fuel supply pipeline; 121, fuel source; 122, fuel pump; 123, fuel flow regulating valve;

[0044] 13, air supply pipeline; 131, air source; 132, air flow regulating valve;

[0045] 14, cooling medium supply pipeline; 141, cooling medium source; 142, cooling medium flow regulating valve;

[0046] 20, measurement and control system; 21, host computer; 22, HMI human-machine interface; 23, data acquisition card; 24, controller; 25, isolation module; 26, relay;

[0047] 30, fatigue testing machine; 31, fixture;

[0048] 40, sample. Detailed implementation manners

[0049] In this application, unless otherwise clearly specified and defined, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection, it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] In the description of this specification, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0051] Figure 1 It is a block diagram of the combustion atmosphere simulation assembly 100 provided according to one embodiment of this application. Figure 2 It is a schematic diagram of the connection relationship of the combustion atmosphere simulation assembly 100 provided according to one embodiment of this application. Figure 3 It is Figure 2 a cross-sectional view of the gas generator 11 in Figure 1 and Figure 2 , the combustion atmosphere simulation assembly 100 at least includes a gas generator system 10 and a measurement and control system 20.

[0052] The gas generator system 10 includes a gas generator 11, a fuel supply pipeline 12, an air supply pipeline 13, and a cooling medium supply pipeline 14. A combustion chamber R is formed in the gas generator 11, and the fuel supply pipeline 12, the air supply pipeline 13, and the cooling medium supply pipeline 14 are all communicated with the combustion chamber R.

[0053] The measurement and control system 20 is connected to the gas generator system 10 and is configured to control the fuel supply pipeline 12, the air supply pipeline 13, and the cooling medium supply pipeline 14 to regulate the temperature and pressure in the combustion chamber R.

[0054] In this embodiment, the gas generator system 10 is used to form a combustion atmosphere. Specifically, a combustion chamber R is formed inside the gas generator 11 to provide a place for combustion. The fuel supply pipeline 12 can supply the fuel required for combustion, the air supply pipeline 13 can supply the combustion-supporting gas required for combustion, and the cooling medium supply pipeline 14 can be used to regulate the pressure inside the combustion chamber R. Obviously, the fuel supply pipeline 12 and the air supply pipeline 13 can be used to regulate the temperature inside the combustion chamber R.

[0055] The measurement and control system 20 is connected to the gas generator system 10 for control. By controlling the actuating devices on the corresponding pipelines in the gas generator system 10, the supply flow rates of fuel, air, and cooling medium are regulated to achieve the purpose of regulating the temperature and pressure inside the combustion chamber R, and thus the combustion chamber R can be made to be in the required combustion atmosphere environment.

[0056] To facilitate understanding of this solution, the following will describe how the gas generator system 10 forms a combustion atmosphere in combination with Figure 3 the shown gas generator 11. In Figure 3 the shown embodiment, the gas generator 11 includes a housing assembly 111, an atomizing nozzle 112, an igniter 113, and a cooling nozzle structure 114.

[0057] Among them, a combustion chamber R is formed inside the housing assembly 111. The atomizing nozzle 112 and the cooling nozzle structure 114 are respectively arranged at the two axial ends of the housing assembly 111, and the igniter 113 is arranged on the housing assembly 111 and close to the atomizing nozzle 112.

[0058] It should be noted that openings communicating with the combustion chamber R are respectively provided at the two axial ends of the housing assembly 111 and are correspondingly an inlet end and an outlet end. The atomizing nozzle 112 is installed at the inlet end, and the cooling nozzle structure 114 is installed at the outlet end.

[0059] Among them, both the fuel supply pipeline 12 and the air supply pipeline 13 are connected to the atomizing nozzle 112 to form atomized fuel inside the combustion chamber R. The igniter 113 is used to ignite the atomized fuel, so as to form a high-temperature and high-pressure gas environment inside the combustion chamber R.

[0060] It can be understood that the high-temperature and high-pressure gas needs to be ejected from the cooling nozzle structure 114 located at the outlet end. A nozzle opening is formed inside the cooling nozzle structure 114, and the throat of the nozzle opening is the place with the minimum flow cross-sectional area of the nozzle opening. The cooling medium supply pipeline 14 is connected to the cooling nozzle structure 114 and can eject the cooling medium into the nozzle opening, thereby squeezing the area of the nozzle throat, that is, adjusting the area of the nozzle throat.

[0061] It should be understood that the area of the nozzle throat affects the ejection of the gas formed inside the combustion chamber R, and thus affects the pressure inside the combustion chamber R. Changing the area of the nozzle throat can achieve the adjustment of the pressure inside the combustion chamber R.

[0062] Further, the gas generator 11 further includes a sensor 115 disposed on the housing assembly 111 for detecting the temperature and pressure in the combustion chamber R. In a specific application, the measurement and control system 20 is connected to the sensor 115 and can obtain the temperature and pressure signals collected by the sensor 115, that is, the actual temperature and actual pressure in the combustion chamber R.

[0063] As can be seen from the above, the combustion atmosphere simulation assembly 100 has at least the following advantages. First, the fuel supplied by the fuel supply pipeline 12 is the fuel used in an aero gas turbine, generally kerosene, which can better reproduce the real combustion atmosphere environment in the aero gas turbine compared with the induction heating method and the natural gas combustion method, significantly improving the reliability of the simulation results. Second, the fuel supply pipeline 12, the air supply pipeline 13, and the cooling medium supply pipeline 14 are controlled by the measurement and control system 20 to adjust the fuel supply flow rate, the air supply flow rate, and the cooling medium supply flow rate, so that the temperature and pressure in the combustion chamber R reach the preset target values, realizing the automatic regulation of the temperature and pressure in the combustion chamber R, that is, the combustion atmosphere simulation assembly can compatibly adjust the temperature and pressure in the combustion chamber R.

[0064] In some alternative embodiments, the fuel supply pipeline 12 includes a fuel source 121 and a fuel pump 122 connected in sequence. The fuel pump 122 is used to pump the fuel in the fuel source 121 into the combustion chamber R. The fuel pump 122 is connected to the measurement and control system 20 and is used to pump the fuel in the fuel source 121 into the combustion chamber R.

[0065] In this embodiment, the fuel source 121 in the fuel supply pipeline 12 provides fuel, and the fuel pump 122 serves as the power source for fuel delivery. In a specific application, the fuel source 121 is a container tank filled with fuel, a fuel supply pipeline, etc., and is directly pumped out by the fuel pump 122 and pumped into the combustion chamber R. It can be understood that the rotation speed of the fuel pump 122 is one of the important factors affecting the fuel flow rate in the fuel supply pipeline 12.

[0066] In a further alternative embodiment, the fuel supply pipeline 12 further includes a fuel flow regulating valve 123 disposed between the fuel pump 122 and the gas generator 11.

[0067] The fuel flow regulating valve 123 is connected to the measurement and control system 20, and the measurement and control system 20 is configured to control the opening degree of the fuel flow regulating valve 123 and / or the rotation speed of the fuel pump 122 to adjust the fuel flow rate entering the combustion chamber R, thereby regulating the temperature in the combustion chamber R.

[0068] In this embodiment, the fuel supply pipeline 12 further includes a fuel flow regulating valve 123, which can be used to regulate the fuel flow in the fuel supply pipeline 12. It should be understood that the valve opening degree of the fuel flow regulating valve 123 is one of the important factors affecting the fuel flow in the fuel supply pipeline 12. In specific applications, the fuel source 121, the fuel pump 122, the fuel flow regulating valve 123, and the atomizing nozzle 112 of the gas generator 11 are sequentially connected by pipelines.

[0069] The measurement and control system 20 is connected to the fuel pump 122 and the fuel flow regulating valve 123 for control, and can control at least one of the rotation speed of the fuel pump 122 and the valve opening degree of the fuel flow regulating valve 123.

[0070] In an alternative embodiment, the valve opening degree of the fuel flow regulating valve 123 is fixed, and the measurement and control system 20 only controls the rotation speed of the fuel pump 122 to regulate the fuel flow in the fuel supply pipeline 12, that is, the fuel flow entering the combustion chamber R. It can be understood that the fuel flow can affect the combustion temperature, and thus achieve the purpose of regulating the temperature in the combustion chamber R.

[0071] In another alternative embodiment, the rotation speed of the fuel pump 122 is fixed, and the measurement and control system 20 only controls the valve opening degree of the fuel flow regulating valve 123 to regulate the fuel flow in the fuel supply pipeline 12, and thus achieve the purpose of regulating the temperature in the combustion chamber R.

[0072] In yet another alternative embodiment, the measurement and control system 20 can both control the rotation speed of the fuel pump 122 and the valve control of the fuel flow regulating valve 123, so that the fuel flow in the fuel supply pipeline 12 reaches the required fuel flow, and thus achieve the purpose of regulating the temperature in the combustion chamber R.

[0073] It can be seen that the fuel flow can be adjusted in three modes. The first is by controlling the rotation speed of the fuel pump 122, the second is by controlling the valve opening degree of the fuel flow regulating valve 123, and the third is the combination of controlling the rotation speed of the fuel pump 122 and the valve opening degree of the fuel flow regulating valve 123, that is, the combination of the first two fuel flow adjustment modes, but this adjustment mode is relatively complex. In specific applications, the fuel flow is adjusted by controlling the rotation speed of the fuel pump 122.

[0074] In some alternative embodiments, the air supply pipeline 13 includes an air source 131 and an air flow regulating valve 132 connected in sequence, and the air provided by the air source 131 enters the gas generator 11 through the air flow regulating valve 132.

[0075] The air flow regulating valve 132 is connected to the measurement and control system 20, and the measurement and control system 20 is configured to control the opening degree of the air flow regulating valve 132 to adjust the air flow entering the gas generator 11.

[0076] In this embodiment, the air source 131 is used to supply air. In a specific application, the air source 131 can be an air supply pipeline equipped with an air compressor, a compressor, etc., capable of supplying air at a certain pressure. It should be understood that the air source 131, the air flow regulating valve 132, and the gas generator 11 are sequentially connected by pipelines. By controlling the valve opening of the air flow regulating valve 132, the air flow in the air supply pipeline 13 can be changed.

[0077] In this embodiment, the measurement and control system 20 can control the valve opening of the air flow regulating valve 132, so that the air flow entering the combustion chamber R is the required air flow.

[0078] It should be noted that the air supply pipeline 13 can be connected to the atomizing nozzle 112 of the gas generator 11 for atomizing fuel and mixing it with fuel for combustion. Therefore, the air flow entering the combustion chamber R is also one of the important factors affecting the combustion chamber R.

[0079] In some alternative embodiments, the cooling medium supply pipeline 14 includes a cooling medium source 141 and a cooling medium flow regulating valve 142 connected in sequence. The cooling medium provided by the cooling medium source 141 enters the nozzle of the gas generator 11 through the cooling medium flow regulating valve 142.

[0080] The cooling medium flow regulating valve 142 is connected to the measurement and control system 20. The measurement and control system 20 is configured to control the opening of the cooling medium flow regulating valve 142 to adjust the throat area of the nozzle of the gas generator 11, so as to regulate the pressure in the combustion chamber R.

[0081] In this embodiment, the cooling medium source 141, the cooling medium flow regulating valve 142, and the cooling nozzle structure 114 of the gas generator 11 can be sequentially connected by pipelines. The cooling medium source 141 provides the cooling medium, which can be specifically a cooling medium supply pipeline, a pressure tank containing the cooling medium, etc. In a specific application, the cooling medium can be water or a non-flammable liquid containing water with a cooling effect.

[0082] The valve opening of the cooling medium flow regulating valve 142 can affect the cooling medium flow in the cooling medium supply pipeline 14. The measurement and control system 20 can control the valve opening of the cooling medium flow regulating valve 142 so that the cooling medium flow in the cooling medium supply pipeline 14 reaches the required cooling medium flow.

[0083] The cooling medium flow can affect the injection depth of the cooling medium at the throat of the nozzle to squeeze the throat area of the nozzle, so that the throat area of the nozzle can be changed, and thus the purpose of regulating the pressure in the combustion chamber R can be achieved.

[0084] It should be noted that the fuel flow regulating valve 123, the air flow regulating valve 132, and the cooling medium flow regulating valve 142 can all be electric flow regulating valves. The measurement and control system 20 can issue the opening signals of the fuel flow regulating valve, the air flow regulating valve, and the cooling medium flow regulating valve to control the valve openings of the corresponding regulating valves. Of course, the measurement and control system 20 can also issue the fuel pump speed signal to control the speed of the fuel pump 122.

[0085] In some alternative embodiments, the combustion atmosphere simulation assembly further includes a fatigue testing machine 30, which is configured to apply a mechanical load to the specimen 40 located in the combustion chamber R.

[0086] The fatigue testing machine 30 is connected to the measurement and control system 20, and the measurement and control system 20 is configured to control the mechanical load applied by the fatigue testing machine 30 to the specimen 40.

[0087] In this embodiment, the specimen 40 here can refer to an alloy block to be applied to an aero gas turbine, such as an alloy used on a turbine blade. The gas generator system 10 can simulate the high-temperature and high-pressure gas atmosphere environment where the specimen 40 is located. The measurement and control system 20 can control the operation of the fatigue testing machine 30 to simulate the mechanical load that the specimen 40 needs to bear, so as to test the fatigue performance of the specimen 40. In specific applications, the measurement and control system 20 can obtain the mechanical load loading signal sent by the fatigue testing machine 30 to make the fatigue testing machine 30 reach the required mechanical load.

[0088] It can be seen that the combustion atmosphere simulation assembly 100 combines the gas generator system 10 and the fatigue testing machine 30 to simulate the real working environment of the test specimen as much as possible.

[0089] In one embodiment, the fatigue testing machine 30 further includes a fixture 31, which is used to fix the specimen 40 to ensure that the specimen 40 is firmly fixed in the combustion chamber R. It can be understood that at least part of the fixture 31 is located in the combustion chamber R, so the fixture 31 will also be affected by the high temperature in the combustion chamber R. In one alternative embodiment, the cooling medium supply pipeline 14 includes a cooling medium branch connected to the fixture 31 to cool the fixture 31.

[0090] In some alternative embodiments, the measurement and control system 20 includes a host computer 21, an HMI human-machine interface 22, a data acquisition card 23, a controller 24, an isolation module 25, and a relay 26.

[0091] The host computer 21 is connected to the data acquisition card 23 to receive the data collected by the data acquisition card 23, and can design the required mechanical load and parameters such as the target temperature and target pressure in the combustion chamber R.

[0092] The isolation module 25 is connected to the data acquisition card 23. The real-time temperature and pressure data, etc. in the combustion chamber R collected by the sensor 115 are sent to the data acquisition card 23 via the isolation module 25. The isolation module 25 plays a role in protecting the data acquisition card 23 and preventing high-power signals from damaging the data acquisition card 23.

[0093] The relay 26 is connected to the data acquisition card 23 and the controller 24 and is used to output a control signal to solve the problem of insufficient power of the data acquisition card.

[0094] The controller 24 is connected to the upper computer 21 via the HMI human-machine interface 22. The HMI human-machine interface 22 realizes real-time communication between the upper computer 21 and the controller 24. The controller 24 is used to receive signals and realize the closed-loop control of the air flow rate and the temperature and pressure in the combustion chamber R.

[0095] In an optional embodiment, the measurement and control system 20 is constructed based on a programmable logic controller (PLC), that is, the controller 24 is a PLC controller. The upper computer 21 can be, for example, a personal computer, a smart phone, a smart tablet, etc. The HMI human-machine interface 22 uses a touch screen. Of course, the measurement and control system 20 is not limited to this. For example, it can be constructed based on a single-chip microcomputer, a microprocessor, etc.

[0096] In a specific application, pressure sensors (not shown in the figure) are provided on the fuel supply pipeline 12, the air supply pipeline 13, and the cooling medium supply pipeline 14 to send fuel pressure signals, air pressure signals, and cooling medium pressure signals to the controller 24. These pressure signals can be used as correction signals to correct the valve opening degrees of the regulating valves on the corresponding pipelines.

[0097] Figure 4 It is a step block diagram of a combustion atmosphere simulation control method provided according to one embodiment of the present application. Please refer to Figure 4 On the other hand, the present application also provides a combustion atmosphere simulation control method. This control method can be applied to the above-mentioned combustion atmosphere simulation assembly, specifically on the measurement and control system 20 that does not belong to the combustion atmosphere simulation assembly. This control method at least includes the following steps:

[0098] S41. Obtain the preset target temperature, preset target pressure, preset target air flow rate, the actual temperature and actual pressure of the combustion chamber R, the fuel pressure of the fuel supply pipeline 12, the actual air flow rate and air pressure of the air supply pipeline 13, and the cooling medium pressure of the cooling medium supply pipeline 14;

[0099] S42. Adjust the valve opening degree of the air flow regulating valve 132 in the air supply pipeline 13 according to the preset target air flow rate, the actual air flow rate, and the air pressure so that the actual air flow rate reaches the preset target air flow rate;

[0100] S43. Adjust the rotational speed of the fuel pump 122 and / or the valve opening of the fuel flow regulating valve 123 in the fuel supply pipeline 12 according to the preset target temperature, the actual temperature, and the fuel pressure, so that the temperature in the combustion chamber R reaches the preset target temperature;

[0101] S44. Adjust the valve opening of the cooling medium flow regulating valve 142 in the cooling medium supply pipeline 14 according to the preset target pressure, the actual pressure, and the cooling medium pressure, so that the pressure in the combustion chamber R reaches the preset target pressure.

[0102] In this embodiment, for S41, the preset target temperature, the preset target pressure, and the preset air flow rate can all be set through the host computer 21 in the measurement and control system 20. Among them, the preset target temperature and the preset target pressure refer to the temperature and pressure required to be reached in the combustion chamber R, and the preset air flow rate refers to the air flow rate required to be provided in the air supply pipeline 13.

[0103] The actual temperature and actual pressure in the combustion chamber R can be obtained through the temperature and pressure signals in the combustion chamber sent by the sensor 115 on the gas generator 11.

[0104] In one embodiment, a fuel pressure sensor (not shown in the figure) is provided between the fuel pump 122 and the fuel flow regulating valve 123 in the fuel supply pipeline 12. The fuel pressure sensor can be located at the inlet of the fuel flow regulating valve 123 to detect the fuel pressure and generate a fuel pressure signal, which is sent to the controller 24 in the measurement and control system 20. In this way, the measurement and control system 20 can obtain the fuel pressure on the inlet side of the fuel flow regulating valve 123.

[0105] In one embodiment, an air pressure sensor (not shown in the figure) is provided between the air source 131 and the air flow regulating valve 132 in the air supply pipeline 13. Moreover, an air flow sensor (not shown in the figure) is provided downstream of the air flow regulating valve 132 to detect the air flow rate entering the combustion chamber R and generate an air flow rate signal. The air pressure sensor can be located at the inlet of the air flow regulating valve 132 to detect the air pressure and generate an air pressure signal. The air flow rate signal and the air pressure signal are sent to the controller 24 in the measurement and control system 20. In this way, the measurement and control system 20 can obtain the actual air flow rate entering the combustion chamber R and the air pressure on the inlet side of the air flow regulating valve 132.

[0106] In one embodiment, a cooling medium pressure sensor (not shown in the figure) is directly provided between the cooling medium source 141 in the cooling medium supply line 14 and the cooling medium flow regulating valve 142. The cooling medium pressure sensor can be located at the inlet of the cooling medium flow regulating valve 142 to detect the cooling medium pressure and generate a cooling medium pressure signal, which is sent to the controller 24 in the measurement and control system 20. In this way, the measurement and control system 20 can obtain the cooling medium pressure on the inlet side of the cooling medium flow regulating valve 142.

[0107] For S42, the measurement and control system 20 can control the valve opening of the air flow regulating valve 132 according to the preset target air flow and the actual air flow obtained in the air supply line 13 to affect the air flow in the line. The measurement and control system 20 can also correct the valve opening of the air flow regulating valve 132 according to the air pressure, so as to achieve high-precision regulation of the air flow in the air supply line 13 and make the air flow in the line accurately reach the preset target air flow.

[0108] For S43, in an alternative embodiment, only the fuel pump 122 is provided in the fuel supply line 12. The measurement and control system 20 can directly control the rotation speed of the fuel pump 122 according to the preset target temperature and the actual temperature obtained in the combustion chamber R to adjust the fuel flow so that the temperature in the combustion chamber R reaches the preset target temperature.

[0109] In another alternative embodiment, the fuel supply line 12 is further provided with a fuel flow regulating valve 123. The measurement and control system 20 can directly control only the valve opening of the fuel flow regulating valve 123 according to the preset target temperature and the actual temperature obtained in the combustion chamber R to change the fuel flow in the line. Further, the measurement and control system 20 can also correct the valve opening of the fuel flow regulating valve 123 according to the fuel pressure to make the fuel flow in the line fluctuate more finely, which is beneficial to ensuring that the temperature in the combustion chamber R accurately reaches the preset target temperature.

[0110] In yet another alternative embodiment, the measurement and control system 20 can simultaneously adjust the rotation speed of the fuel pump 122 and the valve opening of the fuel flow regulating valve 123, and let the two cooperate to control the fuel flow in the line, so as to make the temperature in the combustion chamber R reach the preset target temperature.

[0111] It should be understood that both the air flow and the fuel flow have a certain impact on the temperature in the combustion chamber R. In this solution, the air flow regulation step (S42) is carried out first, that is, before the temperature regulation in the combustion chamber R (before S43), it is ensured that the air flow is the preset target air flow. In other words, the temperature control in the combustion chamber R is achieved by adjusting the fuel flow under a constant air flow.

[0112] For S44, the measurement and control system 20 can control the valve opening of the cooling medium flow regulating valve 142 according to the preset target pressure and the actual pressure in the combustion chamber R, so as to change the flow rate of the cooling medium in the pipeline. Further, the measurement and control system can also correct the valve opening of the cooling medium flow regulating valve 142 according to the cooling medium pressure, so that the flow rate of the cooling medium in the pipeline fluctuates more precisely, which is conducive to ensuring that the pressure in the combustion chamber R is accurately at the preset target pressure.

[0113] It should be noted that for the temperature control step (S43) and the pressure control step (S44), since the two do not interfere with each other, the two steps can be carried out simultaneously without a sequence.

[0114] Figure 5 It is a flow chart of air flow control provided according to one embodiment of the present application. Please refer to Figure 5 , in some alternative embodiments, for S42, the following steps may be included:

[0115] Based on the PID algorithm and according to the preset target air flow rate and the actual air flow rate, obtain the change amount of the valve opening of the air flow regulating valve 132.

[0116] According to the air pressure adjustment, correct the change amount of the valve opening of the air flow regulating valve 132 to obtain the corrected change amount of the valve opening of the air flow regulating valve 132, so as to control the valve opening of the air flow regulating valve 132.

[0117] In this embodiment, multiple PID modules are integrated in the controller 24 of the measurement and control system 20, and the PID algorithm is integrated therein. The controller 24 can obtain the target air flow rate and the actual air flow rate in the pipeline, and adjust the valve opening of the air flow regulating valve 132 based on the PID algorithm.

[0118] It can be understood that when the valve opening of the air flow regulating valve 132 is constant, the greater the air pressure, the greater the air flow rate flowing out through the air flow regulating valve 132 generally is. That is, the air pressure has a certain influence on the air flow rate. Therefore, in this embodiment, the air pressure is introduced to correct the change amount of the valve opening in a single PID control, and the air flow regulating valve 132 is adjusted with the corrected change amount of the valve opening.

[0119] Figure 6 It is a flow chart of temperature control provided according to one embodiment of the present application. Figure 7 It is a flow chart of temperature control provided according to another embodiment of the present application. Please refer to Figure 6 , in some alternative embodiments, for S43, the following steps may be included:

[0120] Based on the PID algorithm and according to the preset target temperature and the actual temperature, obtain the valve opening change amount of the fuel flow regulating valve 123.

[0121] According to the fuel pressure, correct the valve opening change amount of the fuel flow regulating valve 123 to obtain the corrected valve opening change amount of the fuel flow regulating valve 123, so as to regulate the valve opening of the fuel flow regulating valve 123.

[0122] In this embodiment, the controller 24 in the measurement and control system 20 can transmit the obtained preset target temperature and the actual temperature in the combustion chamber R to its PID module, and based on the PID algorithm, regulate the valve opening of the fuel flow regulating valve 123.

[0123] It can be understood that when the valve opening of the fuel flow regulating valve 123 is constant, the greater the fuel pressure, the generally greater the fuel flow passing through the fuel flow regulating valve 123. Therefore, in this embodiment, the fuel pressure is introduced to correct the single-time valve opening change amount after PID control, and the fuel flow regulating valve 123 is regulated with the corrected valve opening change amount.

[0124] Please refer to Figure 7 , for the temperature control in the combustion chamber R, it can be achieved only by controlling the rotation speed of the fuel pump 122. Of course, in this case, the temperature in the combustion chamber R is also controlled based on the PID algorithm. Comparing the two temperature control methods, this temperature control method does not need to introduce correction parameters, and the control method is simpler, so it will not be elaborated in detail here.

[0125] Figure 8 It is a pressure control flow block diagram provided according to one embodiment of the present application. Please refer to Figure 8 , in some alternative embodiments, for S44, it may include the following steps:

[0126] Based on the PID algorithm and according to the preset target pressure and the actual pressure, obtain the valve opening change amount of the cooling medium flow regulating valve 142;

[0127] According to the cooling medium pressure, correct the valve opening change amount of the cooling medium flow regulating valve 142 to obtain the corrected valve opening change amount of the cooling medium flow regulating valve 142, so as to regulate the valve opening of the cooling medium flow regulating valve 142.

[0128] In this embodiment, the controller 24 in the measurement and control system 20 can obtain the preset target pressure and the actual pressure in the combustion chamber R and transmit them to its PID module, and based on the PID algorithm, regulate the valve opening of the cooling medium flow regulating valve 142.

[0129] Understandably, when the valve opening of the cooling medium flow regulating valve 142 is constant, the greater the cooling medium pressure, the generally greater the cooling medium flow rate passing through the cooling medium flow regulating valve 142. Therefore, in this embodiment, the cooling medium pressure is introduced to correct the single-time valve opening change amount after PID control, and the fuel cooling medium flow regulating valve 142 is adjusted with the corrected valve opening change amount.

[0130] It should be noted here that the PID control algorithm is a widely used automatic control algorithm. By calculating the deviation between the set value (target value) and the actual measured value, and adjusting the output of the controller according to the magnitude of the deviation, the integral of the deviation, and the rate of change of the deviation.

[0131] The PID control module refers to a combined control module of three control links: proportional, integral, and derivative. By setting appropriate proportional coefficients, integral coefficients, and derivative coefficients, the PID control module can achieve precise control of various systems.

[0132] It should be noted that when the controller 24 is a PLC controller, the existing PLC controller internally integrates a PID control module.

[0133] Combined with the above, the valve openings of the flow regulating valves in the pipeline are all obtained after the PID control algorithm gets the single-time valve opening change amount, and then the fluid pressure is introduced to correct the single-time valve opening change amount, which specifically conforms to the following formula:

[0134]

[0135] It should be noted that Δx1 is the single-time valve opening change amount obtained by the PID control algorithm, and Δx2 is the corrected valve opening change amount. P is the fluid pressure at the inlet of the regulating valve. Thus, it can be seen that the corrected valve opening change amount is inversely proportional to the fluid pressure at the inlet of the regulating valve for correction, that is, the greater the fluid pressure, the smaller the corrected valve opening change amount.

[0136] Exemplarily, if Δx1 is the single-time valve opening change amount of the fuel flow regulating valve 123 obtained by the PID control algorithm, then Δx2 is the corrected valve opening change amount of the fuel flow regulating valve 123, and P is the fuel pressure at the inlet of the fuel flow regulating valve 123. Similarly, it can be analogized to the air flow regulating valve 132 and the cooling medium flow regulating valve 142.

[0137] In summary, the combustion atmosphere simulation assembly and its control method provided by the present application have at least the following advantages. First, kerosene can be used as the fuel for mixed combustion with air, and high-temperature combustion gas closer to the actual working conditions of an aero gas turbine can be generated. As the fuel, the combustion products of kerosene are highly consistent with the actual combustion environment of an aero gas turbine, significantly improving the reliability of the simulation results.

[0138] Second, the fuel flow rate and air flow rate are independently adjusted through the PID control strategy. The dynamic control of temperature takes the target combustion chamber temperature as the input, and the output can be achieved by adjusting the fuel pump speed and the opening degree of the air valve, realizing precise temperature control ability and meeting the requirements of complex temperature load spectrum experiments.

[0139] Third, the precise regulation of the combustion chamber pressure is achieved by controlling the flow rate of the cooling medium through PID. Different from the prior art, the present invention dynamically adjusts the effective nozzle throat area by using the cooling medium, which can not only quickly respond to the pressure change requirements but also significantly improve the pressure control accuracy, filling the gap that the induction heating technology cannot simulate the real pressure environment.

[0140] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A combustion atmosphere simulation assembly, characterized in that, Comprising: A gas generator system (10), including a gas generator (11), a fuel supply pipeline (12), an air supply pipeline (13), and a cooling medium supply pipeline (14). A combustion chamber (R) is formed inside the gas generator (101), and the fuel supply pipeline (12), the air supply pipeline (13), and the cooling medium supply pipeline (14) are all connected to the combustion chamber (R); and A measurement and control system (20), connected to the gas generator system (10) and configured to control the fuel supply pipeline (12), the air supply pipeline (13), and the cooling medium supply pipeline (14) to regulate the temperature and pressure inside the combustion chamber (R).

2. The combustion atmosphere simulation assembly according to claim 1, characterized in that The fuel supply pipeline (12) includes a fuel source (121) and a fuel pump (122) connected in sequence. The fuel pump (122) is connected to the measurement and control system (20) and is used to pump the fuel in the fuel source (121) into the combustion chamber (R).

3. The combustion atmosphere simulation assembly according to claim 2, characterized in that, The fuel supply pipeline (12) further includes a fuel flow regulating valve (123), and the fuel flow regulating valve (123) is arranged between the fuel pump (122) and the gas generator (11); The fuel flow regulating valve (123) is connected to the measurement and control system (20), and the measurement and control system (20) is configured to control the valve opening of the fuel flow regulating valve (123) and / or the rotation speed of the fuel pump (122) to adjust the fuel flow rate entering the combustion chamber (R), thereby regulating the temperature inside the combustion chamber (R).

4. The combustion atmosphere simulation assembly according to claim 1, wherein, The air supply pipeline (13) includes an air source (131) and an air flow regulating valve (132) connected in sequence. The air provided by the air source (131) enters the gas generator (11) through the air flow regulating valve (132); The air flow regulating valve (132) is connected to the measurement and control system (20), and the measurement and control system (20) is configured to control the opening of the air flow regulating valve (132) to adjust the air flow rate entering the combustion chamber (R).

5. The combustion atmosphere simulation assembly according to claim 1, characterized in that The cooling medium supply pipeline (14) includes a cooling medium source (141) and a cooling medium flow regulating valve (142) connected in sequence. The cooling medium provided by the cooling medium source (141) enters the nozzle of the gas generator (11) through the cooling medium flow regulating valve (142); The cooling medium flow regulating valve (142) is connected to the measurement and control system (20), and the measurement and control system (20) is configured to control the opening of the cooling medium flow regulating valve (142) to adjust the throat area of the nozzle of the gas generator (11) to regulate the pressure inside the combustion chamber (R).

6. The combustion atmosphere simulation assembly according to any one of claims 1 to 5, characterized in that, It further includes a fatigue testing machine (30), and the fatigue testing machine (30) is arranged to be able to apply a mechanical load to a specimen (40) located inside the combustion chamber (R); The fatigue testing machine (30) is connected to the measurement and control system (20), and the measurement and control system (20) is configured to control the mechanical load applied by the fatigue testing machine (30) to the sample (40).

7. A combustion atmosphere simulation control method, characterized in that, Applied to the combustion atmosphere simulation assembly according to any one of claims 1 to 6 and including: Obtaining a preset target temperature, a preset target pressure, a preset target air flow rate, the actual temperature and actual pressure of the combustion chamber (R), the fuel pressure of the fuel supply pipeline (12), the actual air flow rate and air pressure of the air supply pipeline (13), and the cooling medium pressure of the cooling medium supply pipeline (14); Adjusting the valve opening degree of the air flow regulating valve (132) in the air supply pipeline (13) according to the preset target air flow rate, the actual air flow rate, and the air pressure, so that the actual air flow rate reaches the preset target air flow rate; Adjusting the rotation speed of the fuel pump (122) and / or the valve opening degree of the fuel flow regulating valve (123) in the fuel supply pipeline (12) according to the preset target temperature, the actual temperature, and the fuel pressure, so that the temperature in the combustion chamber (R) reaches the preset target temperature; Adjusting the valve opening degree of the cooling medium flow regulating valve (142) in the cooling medium supply pipeline (14) according to the preset target pressure, the actual pressure, and the cooling medium pressure, so that the pressure in the combustion chamber (R) reaches the preset target pressure.

8. The combustion atmosphere simulation control method according to claim 7, characterized in that, The adjusting the valve opening degree of the air flow regulating valve (132) in the air supply pipeline (13) according to the preset target air flow rate, the actual air flow rate, and the air pressure, so that the actual air flow rate reaches the preset target air flow rate, includes: Based on the PID algorithm and according to the preset target air flow rate and the actual air flow rate, obtaining the valve opening degree change amount of the air flow regulating valve (132); Adjusting and correcting the valve opening degree change amount of the air flow regulating valve (132) according to the air pressure to obtain the corrected valve opening degree change amount of the air flow regulating valve (132), so as to adjust the valve opening degree of the air flow regulating valve (132).

9. The combustion atmosphere simulation control method according to claim 7, wherein, The adjusting the rotation speed of the fuel pump (122) and / or the valve opening degree of the fuel flow regulating valve (123) in the fuel supply pipeline (12) according to the preset target temperature, the actual temperature, and the fuel pressure, so that the temperature in the combustion chamber (R) reaches the preset target temperature, includes: Based on the PID algorithm and according to the preset target temperature and the actual temperature, obtaining the valve opening degree change amount of the fuel flow regulating valve (123); Adjusting and correcting the valve opening degree change amount of the fuel flow regulating valve (123) according to the fuel pressure to obtain the corrected valve opening degree change amount of the fuel flow regulating valve (123), so as to adjust the valve opening degree of the fuel flow regulating valve (123).

10. The combustion atmosphere simulation control method according to claim 7, characterized in that, Adjusting the valve opening of the cooling medium flow regulating valve (142) in the cooling medium supply pipeline (14) according to the preset target pressure, the actual pressure, and the cooling medium pressure, so that the pressure in the combustion chamber (R) reaches the preset target pressure, includes: Obtaining the valve opening change amount of the cooling medium flow regulating valve (142) based on the PID algorithm and according to the preset target pressure and the actual pressure; Correcting the valve opening change amount of the cooling medium flow regulating valve (142) according to the cooling medium pressure to obtain the corrected valve opening change amount of the cooling medium flow regulating valve (142), so as to adjust the valve opening of the cooling medium flow regulating valve (142).

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