Liquid engine thermal test post-processing method

Abstract

The invention discloses a liquid engine thermal test post-processing method which comprises the following steps: after an engine thermal test is finished, opening each discharge path of an engine, and injecting preset dry gas from a pump inlet, a thrust chamber head cavity and a generator head cavity of the engine for at least a first preset duration so as to blow off and rewarm an inner cavity of the engine; in the blowing and rewarming process of the engine, preset dry gas is injected from the gas path blind cavity of the engine and lasts for at least a second preset duration, so that the gas path blind cavity of the engine is blown; and after blowing and rewarming of the engine are finished, dew point detection is conducted on the target point position of the engine till the detection result of dew point detection meets the preset condition. On one hand, the engine thermal test post-treatment process is simplified, the engine thermal test period is shortened, on the other hand, the engine inner cavity and the engine blind cavity are blown off at the same time, the blowing-off effect of the engine is improved, and the reusability of the engine is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of liquid rocket engines, and in particular to a liquid engine thermal test post-processing method. Background Art

[0002] Liquid engines usually refer to rocket engines that use liquid fuel and oxidizer as propellants. For example, liquid oxygen-methane engines use liquid oxygen and liquid methane as propellants and are currently widely used in various space vehicles. As a reusable engine that uses cryogenic propellants, the liquid oxygen-methane engine should ensure that the engine cavity is always in a dry and clean environment to prevent electrochemical corrosion of metal parts on the engine and the generation of ice blockages and other excess materials. Therefore, after the engine thermal test is completed, the engine cavity should be treated in time to prevent external water vapor from being sucked back into the engine cavity, and the liquid water remaining in the engine cavity as a result of the combustion products should be treated in time.

[0003] However, the existing post-treatment methods for engine thermal tests take a long time and have poor blowing effects. Therefore, how to improve the blowing effect after engine thermal tests is an urgent problem to be solved. Summary of the invention

[0004] The embodiment of the present application provides a liquid engine thermal test post-treatment method, which solves the technical problems of long time and poor blowing effect in the prior art engine thermal test post-treatment methods, and achieves the technical effect of shortening the engine thermal test cycle and improving the blowing effect after the engine thermal test.

[0005] In a first aspect, the present application provides a liquid engine thermal test post-processing method, the method comprising:

[0006] After the engine heat test is completed, each drain path of the engine is opened, and a preset dry gas is injected from a pump inlet, a thrust chamber head cavity, and a generator head cavity of the engine for at least a first preset time period;

[0007] Injecting a preset dry gas from a gas path blind cavity of the engine for at least a second preset time, the gas path blind cavity comprising a gas path pressure pipe, a starting path, a thrust chamber ignition channel, and a generator ignition channel of the engine;

[0008] After the engine is blown off and rewarmed, a dew point detection is performed on a target point of the engine until a detection result of the dew point detection meets a preset condition.

[0009] Furthermore, after the engine is blown off and rewarmed, a dew point detection is performed on a target point of the engine until a detection result of the dew point detection meets a preset condition, and the method further includes:

[0010] Continue to use the engine for the hot test until the engine hot test is completed; or,

[0011] The engine is protected by positive pressure.

[0012] Furthermore, the positive pressure protection of the engine includes:

[0013] Restoring the engine to the factory state;

[0014] Blowing and replacing the engine;

[0015] A preset dry gas is filled into the inner cavity of the engine to provide positive pressure protection for the engine.

[0016] Further, the blowing and replacing of the engine comprises:

[0017] Opening the outlets of the engine, including the outlet of the thrust chamber, the outlet of the exhaust pipe, and the outlets of various outlet paths;

[0018] continuously supplying a preset dry gas at a preset pressure to an inner chamber of the engine from a pump inlet of the engine;

[0019] Opening the main valve, the secondary valve and the shaft cooling outlet valve of the engine for a third preset time period;

[0020] Opening the discharge valve of the engine, closing the main valve and the secondary valve of the engine, sealing the thrust chamber outlet and the exhaust pipe outlet of the engine, and continuing for a fourth preset time period;

[0021] Closing the exhaust valve of the engine, closing the exhaust outlets of each exhaust path of the engine, and continuing for a fifth preset time period;

[0022] The supply of the preset dry gas from the pump inlet of the engine is stopped, and the shaft cooling drain valve of the engine is closed.

[0023] Further, the injecting of the preset dry gas from the blind cavity of the gas path of the engine and continuing for at least a second preset time period includes:

[0024] After the preset dry gas is injected from the pump inlet, thrust chamber head cavity and generator head cavity of the engine and continues for at least the fifth preset time period, the preset dry gas is injected from the gas path blind cavity of the engine and continues for at least the second preset time period; the first preset time period is greater than the fifth preset time period.

[0025] Further, when the engine is ignited by a powder igniter during a heat test, the injection of a preset dry gas from the blind cavity of the gas path of the engine and continuing for at least a second preset time period includes:

[0026] Disconnecting the connection between the gas line pressure measuring point sensor of the engine and the gas line pressure pipe, and injecting a preset dry gas into the inner cavity of the engine from the gas line pressure pipe interface for at least the second preset time period;

[0027] Injecting a preset dry gas into the inner cavity of the engine from a downstream pipeline interface of a starting valve of the engine and continuing for at least the second preset time period;

[0028] Removing the thrust chamber igniter housing of the engine, and injecting a preset dry gas from the thrust chamber ignition channel of the engine for at least the second preset time period;

[0029] The generator igniter housing of the engine is removed, and a preset dry gas is injected from the generator ignition passage of the engine and lasts for at least the second preset time period.

[0030] Further, when the engine is ignited by a torch igniter during a thermal test, the injection of a preset dry gas from the gas path blind cavity of the engine and continuing for at least a second preset time period includes:

[0031] Disconnecting the connection between the gas line pressure measuring point sensor of the flare igniter of the engine and the gas line pressure pipe, and injecting a preset dry gas into the inner cavity of the engine from the interface of the gas line pressure pipe for at least the second preset time;

[0032] Disconnecting the connection between the gas line pressure measuring point sensor of the engine and the gas line pressure pipe, and injecting a preset dry gas into the inner cavity of the engine from the gas line pressure pipe interface for at least the second preset time period;

[0033] Injecting a preset dry gas into the inner cavity of the engine from a downstream pipeline interface of a starting valve of the engine and continuing for at least the second preset time period;

[0034] Removing the thrust chamber igniter housing of the engine, and injecting a preset dry gas from the thrust chamber ignition channel of the engine for at least the second preset time period;

[0035] The generator igniter housing of the engine is removed, and a preset dry gas is injected from the generator ignition passage of the engine and lasts for at least the second preset time period.

[0036] Further, after the engine is blown off and rewarmed, a dew point detection is performed on a target point of the engine until a detection result of the dew point detection meets a preset condition, including:

[0037] Remove the gas inlet plugs on the sealing tools corresponding to the thrust chamber outlet and the exhaust pipe outlet of the engine respectively;

[0038] Injecting a preset dry gas from the pump inlet of the engine, opening the main valve of the engine, and continuing for a sixth preset time period;

[0039] During the process of injecting the preset dry gas from the pump inlet of the engine, a dew point detector is connected to the gas charging port on the sealing tooling at the thrust chamber outlet of the engine to detect the dew point at the thrust chamber outlet of the engine;

[0040] When the actual dew point value at the outlet of the thrust chamber of the engine is less than a preset threshold value, determining that the detection result of the dew point detection at the outlet of the thrust chamber of the engine meets a preset condition, and disconnecting the dew point detector connected to the outlet of the thrust chamber of the engine;

[0041] When the actual dew point value at the outlet of the thrust chamber of the engine is greater than or equal to a preset threshold value, it is determined that the detection result of the dew point detection at the outlet of the thrust chamber of the engine does not meet the preset condition, and a preset dry gas is continuously injected from the pump inlet of the engine until it is determined that the detection result of the dew point detection at the outlet of the thrust chamber of the engine meets the preset condition, and the dew point detector connected to the outlet of the thrust chamber of the engine is disconnected.

[0042] Further, after the engine is blown off and rewarmed, a dew point detection is performed on a target point of the engine until a detection result of the dew point detection meets a preset condition, including:

[0043] During the process of injecting the preset dry gas from the pump inlet of the engine, opening the secondary valve of the engine and closing the primary valve of the engine for a seventh preset time period;

[0044] Connecting a dew point detector to the air filling port on the sealing tooling at the exhaust pipe outlet of the engine to perform dew point detection on the exhaust pipe outlet of the engine;

[0045] When the actual dew point value at the exhaust pipe outlet of the engine is less than a preset threshold value, determining that the detection result of the dew point detection at the exhaust pipe outlet of the engine meets a preset condition, and disconnecting the dew point detector connected to the exhaust pipe outlet of the engine;

[0046] When the actual dew point value at the exhaust pipe outlet of the engine is greater than or equal to a preset threshold value, it is determined that the detection result of the dew point detection at the exhaust pipe outlet of the engine does not meet the preset condition, and the preset dry gas is continuously injected from the pump inlet of the engine until it is determined that the detection result of the dew point detection at the exhaust pipe outlet of the engine meets the preset condition, the dew point detector connected to the exhaust pipe outlet of the engine is disconnected, the bypass valve of the engine is closed, and the injection of the preset dry gas from the pump inlet of the engine is stopped.

[0047] Furthermore, the preset drying gas is nitrogen.

[0048] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0049] After the engine thermal test is completed, the embodiment of the present application opens each exhaust path of the engine, and injects a preset dry gas from the pump inlet, thrust chamber head cavity and generator head cavity of the engine for at least a first preset time to purge the inner cavity of the engine; injects a preset dry gas from the gas path blind cavity of the engine for at least a second preset time to purge the gas path blind cavity of the engine; after the engine is purged and rewarmed, the target point of the engine is tested for dew point until the detection result of the dew point detection meets the preset conditions. It can be seen that the embodiment of the present application provides a simple and efficient liquid oxygen engine thermal test post-processing method, which not only purges the engine inner cavity, but also purges the engine blind cavity, thereby improving the engine purge effect. On the one hand, the embodiment of the present application simplifies the engine thermal test post-processing process and shortens the engine thermal test cycle. On the other hand, the engine inner cavity and the engine blind cavity are purged at the same time, thereby improving the engine purge effect and greatly improving the reusability of the engine. In addition, the thermal test post-processing method used in the embodiment of the present application usually takes only a few hours, which simplifies the engine thermal test post-processing process, can greatly shorten the engine thermal test processing cycle, and ensure that the engine is delivered to the rocket on schedule. At the same time, the embodiment of the present application performs positive pressure protection after the engine is blown off, which can fully eliminate adverse factors during the storage of the engine, prevent water vapor in the environment from entering the engine, and improve the reliability and reusability of the engine during the later thermal test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0051] Figure 1 A schematic flow chart of a liquid engine thermal test post-processing method provided in an embodiment of the present application;

[0052] Figure 2 A schematic diagram of the structure of a liquid engine provided in an embodiment of the present application;

[0053] Figure 3 A schematic diagram of a gas circuit corresponding to step S11 provided in an embodiment of the present application;

[0054] Figure 4 A schematic flow chart of another liquid engine thermal test post-processing method provided in an embodiment of the present application.

[0055] Reference numerals:

[0056] 1-methane pump inlet, 2-oxygen pump inlet, 3-thrust chamber outlet, 4-exhaust pipe outlet, 5-methane leakage outlet, 6-oxygen leakage outlet, 7-methane shaft cold leakage outlet, 8-oxygen shaft cold leakage outlet, 9-starting road inlet, 10-starting road blow-off port, 11-thrust chamber, 12-generator, 131-turbine pump, 132-turbine pump, 133-turbine pump, 14-main valve, 142-main valve, 15-secondary valve, 152-bypass valve, 161-leakage valve, 162-leakage valve, 171-axial cooling leakage valve, 172-axial cooling leakage valve, 18-starting valve, 19-exhaust pipe, 20-thrust chamber igniter / torch igniter, 21-generator igniter / torch igniter, 221-gunpowder igniter ignition channel, 222-gunpowder igniter ignition channel, 23-thrust chamber head cavity, 24-generator head cavity. DETAILED DESCRIPTION

[0057] The embodiment of the present application provides a liquid engine thermal test post-treatment method, which solves the technical problems of the prior art that the engine thermal test post-treatment method has a long time and a poor blowing effect.

[0058] The technical solution of the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows:

[0059] After the engine thermal test is completed, the embodiment of the present application opens each exhaust path of the engine, and injects a preset dry gas from the pump inlet, thrust chamber head cavity and generator head cavity of the engine for at least a first preset time to purge the inner cavity of the engine; injects a preset dry gas from the gas path blind cavity of the engine for at least a second preset time to purge the gas path blind cavity of the engine; after the engine is purged and rewarmed, the target point of the engine is tested for dew point until the detection result of the dew point detection meets the preset conditions. It can be seen that the embodiment of the present application provides a simple and efficient liquid oxygen engine thermal test post-processing method, which not only purges the engine inner cavity, but also purges the engine blind cavity, thereby improving the engine purge effect. On the one hand, the embodiment of the present application simplifies the engine thermal test post-processing process and shortens the engine thermal test cycle. On the other hand, the engine inner cavity and the engine blind cavity are purged at the same time, thereby improving the engine purge effect and greatly improving the reusability of the engine. In addition, the thermal test post-processing method used in the embodiment of the present application usually takes only a few hours, which simplifies the engine thermal test post-processing process, can greatly shorten the engine thermal test processing cycle, and ensure that the engine is delivered to the rocket on schedule. At the same time, the embodiment of the present application performs positive pressure protection after the engine is blown off, which can fully eliminate adverse factors during the storage of the engine, prevent water vapor in the environment from entering the engine, and improve the reliability and reusability of the engine during the later thermal test process.

[0060] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0061] First of all, the term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0062] The present application embodiment provides Figure 1 A liquid engine thermal test post-processing method is shown, and the method includes steps S11 to S13.

[0063] Step S11, after the engine heat test is completed, opening each drain path of the engine, and injecting a preset dry gas from the pump inlet, the thrust chamber head cavity and the generator head cavity of the engine for at least a first preset time to purge the inner cavity of the engine;

[0064] Step S12, injecting a preset dry gas from the gas path blind cavity of the engine for at least a second preset time to blow out the gas path blind cavity of the engine, wherein the gas path blind cavity includes the gas path pressure pipe, the starting path, the thrust chamber ignition channel, and the generator ignition channel of the engine;

[0065] Step S13, after the engine is blown off and rewarmed, a dew point detection is performed on a target point of the engine until a detection result of the dew point detection meets a preset condition.

[0066] It should be noted that step S11 is executed before step S12 and step S13. Step S12 and step S13 can be executed simultaneously, or step S12 can be executed first and then step S13. The specific selection can be made according to the actual situation, and the embodiment of the present application does not limit this. The engine in the embodiment of the present application refers to a liquid engine, for example, it can be a liquid oxygen methane engine. Figure 2 Shown is a schematic diagram of the structure of a certain liquid oxygen-methane engine.

[0067] Step S11 is mainly used to blow out the main passage of the engine cavity, step S12 is mainly used to blow out the blind cavity of the engine, and step S13 is mainly used to detect the blowing effect of the engine. The preset dry gas used in the embodiment of the present application can be selected according to actual conditions, for example, nitrogen can be selected, and the cost of nitrogen is relatively low.

[0068] Regarding step S11, after the engine thermal test is completed, the various exhaust paths of the engine are opened, and preset dry gas is injected from the pump inlet, thrust chamber head cavity and generator head cavity of the engine and lasts for at least a first preset time to blow out the inner cavity of the engine.

[0069] The engine is a liquid engine. After the thermal test, the temperature of the engine is very low, usually around -173°C. In order to better purge the inside of the engine and reduce the impact of ice or liquid water on the engine, the preset dry gas of this application needs to be heated (for example, in a water bath) to a certain temperature (for example, 60°C-70°C) before being introduced into the engine.

[0070] After the engine heat test is completed, the various drains of the engine are opened, and the preset dry gas that has been heated is injected from the pump inlet, the thrust chamber head cavity, and the generator head cavity of the engine. As the preset dry gas is injected into the engine for an increasing period of time, the temperature of the engine will gradually increase to the ambient temperature or a temperature state higher than the ambient temperature.

[0071] Among them, Figure 2As shown, the exhaust path of the engine may include an oxygen exhaust port, a methane exhaust port, a methane axial cooling exhaust port, and an oxygen axial cooling exhaust port. Opening each exhaust path of the engine specifically means connecting each exhaust path of the engine, that is, controlling the valves on each exhaust path to be in an open state. Figure 2 For the oxygen leakage outlet in the embodiment, it is necessary to open the corresponding leakage path valve 161. Figure 2 For the methane outlet in the embodiment, it is necessary to open the corresponding outlet valve 162. Figure 2 For the oxygen shaft cooling outlet in the, it is necessary to open the corresponding shaft cooling outlet valve 171. Figure 2 For the methane shaft cooling leakage outlet, the corresponding shaft cooling leakage outlet valve 172 needs to be opened.

[0072] The preset dry gas injected into the engine cavity also needs to maintain a certain pressure, for example, 0.6-1.0 MPa of preset dry gas is continuously injected into the engine cavity.

[0073] The interior of the engine is divided into a low-temperature medium area and a high-temperature gas area. When the engine is in operation, the valve between the low-temperature medium area and the high-temperature gas area will be opened. When the engine is not in operation, the valve between the low-temperature medium area and the high-temperature gas area will be closed. Therefore, it is necessary to inject the heated preset dry gas into the engine from multiple injection ports (specifically including the pump inlet, the thrust chamber head cavity, and the generator head cavity). Among them, the valves between the low-temperature medium area and the high-temperature gas area mainly include the main valve and the secondary valve.

[0074] like Figure 3 As shown, Figure 3 The red path in the figure is a schematic diagram of the distribution of the blow-off gas path corresponding to step S11, specifically, a schematic diagram of the distribution of the gas path after opening each leakage path of the engine and injecting the heated preset dry gas from the pump inlet, thrust chamber head cavity and generator head cavity of the engine.

[0075] The first preset duration can be set according to actual conditions, and is usually not less than 2 hours.

[0076] In actual operation, step S12 may be performed after the fifth preset time length is performed in step S11, and the fifth preset time length is shorter than the first preset time length. For example, the fifth preset time length may be 1 hour.

[0077] Regarding step S12, a preset dry gas is injected from the gas path blind cavity of the engine and lasts for at least a second preset time to blow out the gas path blind cavity of the engine, and the gas path blind cavity includes the gas path pressure pipe, starting path, thrust chamber ignition channel and generator ignition channel of the engine.

[0078] After the preset dry gas is injected from the pump inlet, thrust chamber head cavity and generator head cavity of the engine for at least the fifth preset time period, the preset dry gas is injected from the gas path blind cavity of the engine for at least the second preset time period to purge the gas path blind cavity of the engine; the first preset time period is greater than the fifth preset time period.

[0079] The execution of step S12 can be specifically divided into two situations. One situation is that the engine is ignited by a gunpowder igniter during the thermal test, and the other situation corresponds to that the engine is ignited by a torch igniter during the thermal test.

[0080] [Regarding the ignition of the gunpowder igniter] The corresponding gas line pressure measuring point sensors respectively correspond to the gas line pressure pipes mainly distributed in the combustion chamber of the thrust chamber, the combustion chamber of the generator, and the downstream of the combustion chambers of both. This process may specifically include steps S121 to S124.

[0081] Step S121, disconnecting the connection between the gas line pressure measuring point sensor of the engine and the gas line pressure pipe, and injecting a preset dry gas into the inner cavity of the engine from the interface of the gas line pressure pipe for at least the second preset time. The gas line pressure measuring point sensor of the engine, when the gunpowder igniter is ignited, can be a sensor at various positions such as the combustion chamber of the thrust chamber, the combustion chamber of the generator, and the downstream of the combustion chambers of the two.

[0082] Step S122, injecting a preset dry gas into the inner cavity of the engine from the downstream pipeline interface of the starting valve of the engine and continuing for at least the second preset time period.

[0083] Step S123, removing the thrust chamber igniter housing of the engine, and injecting a preset dry gas from the thrust chamber ignition channel of the engine for at least the second preset time period.

[0084] Step S124, removing the generator igniter housing, injecting a preset dry gas from the generator ignition channel of the engine and continuing for at least the second preset time period.

[0085] Regarding step S121 to step S124, they can be executed simultaneously or sequentially, and the specific selection can be made according to the actual situation. If they are executed simultaneously, the blowing efficiency of the engine can be greatly improved.

[0086] In step S121 to step S124, the preset blowing pressure of the drying gas may be 0.3-0.5 MPa, and the second preset time length may be no less than 2 minutes.

[0087] [Regarding ignition of the torch igniter] The corresponding gas line pressure measuring point sensors respectively correspond to the gas line pressure pipes mainly distributed in the combustion chamber of the thrust chamber, the combustion chamber of the generator, the combustion chamber of the torch igniter and the downstream of the combustion chambers of the three. This process may specifically include steps S125 to S129.

[0088] Step S125, disconnecting the gas line pressure measuring point sensor of the engine's torch igniter from the gas line pressure pipe, and injecting a preset dry gas into the inner cavity of the engine from the gas line pressure pipe interface for at least the second preset time.

[0089] Step S126, disconnect the connection between the gas line pressure measuring point sensor of the engine and the gas line pressure pipe, and inject the preset dry gas into the inner cavity of the engine from the interface of the gas line pressure pipe for at least the second preset time. The gas line pressure measuring point sensor of the engine, when the flare igniter is ignited, can be a sensor at various positions such as the combustion chamber of the thrust chamber, the combustion chamber of the generator, the combustion chamber of the flare igniter, and the downstream of the combustion chambers of the three.

[0090] Step S127, injecting a preset dry gas into the inner cavity of the engine from the downstream pipeline interface of the starting path valve of the engine and continuing for at least the second preset time period.

[0091] Step S128, removing the thrust chamber igniter housing of the engine, and injecting a preset dry gas from the thrust chamber ignition channel of the engine for at least the second preset time period.

[0092] Step S129, removing the generator igniter housing, injecting a preset dry gas from the generator ignition channel of the engine and continuing for at least the second preset time period.

[0093] Steps S125 to S129 can be performed simultaneously or sequentially, and the specific selection can be made according to the actual situation. If the simultaneous execution is selected, the blowing efficiency of the engine can be greatly improved.

[0094] In step S125 to step S129, the preset blowing pressure of the drying gas may be 0.3-0.5 MPa, and the second preset time length may be no less than 2 minutes.

[0095] It should be noted that steps S121 to S124 are respectively the same as steps S126 to S129. That is, the difference between the process of ignition by a powder igniter and the process of ignition by a torch igniter lies in step S125. When blowing is performed in the case of ignition by a powder igniter, step S125 does not need to be performed. When blowing is performed in the case of ignition by a torch igniter, step S125 needs to be performed so as to blow the corresponding gas path and ensure a better blowing effect.

[0096] Regarding step S13, after the engine is blown off and rewarmed, a dew point detection is performed on a target point of the engine until the detection result of the dew point detection meets a preset condition.

[0097] Step S13 specifically includes step S131 to step S139.

[0098] Step S131, removing the inflation port plugs on the sealing tools corresponding to the thrust chamber outlet and the exhaust pipe outlet of the engine respectively.

[0099] Step S132, injecting a preset dry gas from the pump inlet of the engine, opening the main valve of the engine, and continuing for a sixth preset time period, wherein the preset blowing pressure of the dry gas may be 0.4-0.6 MPa, and the sixth preset time period is 10-15 minutes.

[0100] Step S133, during the process of injecting the preset dry gas from the pump inlet of the engine, a dew point detector is connected to the inflation port on the sealing tooling at the thrust chamber outlet of the engine to perform dew point detection on the thrust chamber outlet of the engine.

[0101] Step S134, when the actual dew point value at the outlet of the thrust chamber of the engine is less than a preset threshold value, it is determined that the detection result of the dew point detection at the outlet of the thrust chamber of the engine meets the preset condition, and the dew point detector connected to the outlet of the thrust chamber of the engine is disconnected.

[0102] Step S135, when the actual dew point value at the outlet of the thrust chamber of the engine is greater than or equal to a preset threshold value, it is determined that the detection result of the dew point detection at the outlet of the thrust chamber of the engine does not meet the preset condition, and the preset dry gas is continuously injected from the pump inlet of the engine until it is determined that the detection result of the dew point detection at the outlet of the thrust chamber of the engine meets the preset condition, and the dew point detector connected to the outlet of the thrust chamber of the engine is disconnected.

[0103] Step S136, during the process of injecting the preset dry gas from the pump inlet of the engine, the secondary valve of the engine is opened, the main valve of the engine is closed, and the seventh preset time is continued. The preset blowing pressure of the dry gas can be 0.4-0.6MPa, and the seventh preset time is 10-15 minutes.

[0104] Step S137, connecting a dew point detector to the air filling port on the sealing tooling at the exhaust pipe outlet of the engine to perform dew point detection on the exhaust pipe outlet of the engine.

[0105] Step S138, when the actual dew point value at the exhaust pipe outlet of the engine is less than a preset threshold, determine that the detection result of the dew point detection at the exhaust pipe outlet of the engine meets the preset conditions, and disconnect the dew point detector connected to the exhaust pipe outlet of the engine.

[0106] Step S139, when the actual dew point value at the exhaust pipe outlet of the engine is greater than or equal to a preset threshold value, it is determined that the detection result of the dew point detection at the exhaust pipe outlet of the engine does not meet the preset condition, and the preset dry gas is continuously injected from the pump inlet of the engine until it is determined that the detection result of the dew point detection at the exhaust pipe outlet of the engine meets the preset condition, the dew point detector connected to the exhaust pipe outlet of the engine is disconnected, the bypass valve of the engine is closed, and the injection of the preset dry gas from the pump inlet of the engine is stopped.

[0107] On the basis of the above-mentioned scheme, the embodiment of the present application continues to provide the following technical scheme. Specifically, after the engine is blown off and rewarmed, a dew point detection is performed on the target point of the engine until the detection result of the dew point detection meets the preset conditions. The method also includes step S21-step S22. In each operation process, step S21 and step S22 are used one by one.

[0108] Step S21, continue to use the engine to perform the thermal test until the engine thermal test is completed.

[0109] Step S22, performing positive pressure protection on the engine.

[0110] After the engine dew point test is qualified, if the engine still needs to continue the heat test, step S21 is executed, that is, the engine is continued to be used for the heat test. After the heat test of step S21 is completed, the execution returns to step S11-step S13. After the engine dew point test is qualified, if the engine does not need to be subjected to the heat test, step S22 is executed to perform positive pressure protection on the engine.

[0111] If the engine has passed the dew point test before step S21, there is no need to perform the dew point test before the thermal test. Instead, step S21 can be directly executed and the engine can continue to be used for the thermal test. This can reduce the dew point test procedure and shorten the test cycle.

[0112] Wherein step S22 comprises:

[0113] Step S221, restoring the engine to the factory state;

[0114] Step S222, blowing and replacing the engine;

[0115] Step S223, filling the inner cavity of the engine with a preset dry gas to perform positive pressure protection on the engine.

[0116] Among them, step S222, the blowing and replacing of the engine includes steps S2221 to S2226.

[0117] Step S2221, opening the outlets of the engine, wherein the outlets include the thrust chamber outlet, the exhaust pipe outlet, and the outlets of various outlet paths.

[0118] Step S2222: continuously supplying a preset dry gas of a preset pressure to the inner cavity of the engine from the pump inlet of the engine. The preset pressure may be 0.3-0.5 MPa.

[0119] Step S2223, opening the main valve, the secondary valve and the shaft cooling outlet valve of the engine and continuing for a third preset time period; the third preset time period may be 5 minutes.

[0120] Step S2224, open the discharge valve of the engine, close the main valve and the secondary valve of the engine, seal the thrust chamber outlet and the exhaust pipe outlet of the engine, and continue for a fourth preset time period; the fourth preset time period may be 5 minutes.

[0121] Step S2225, closing the exhaust valve of the engine, closing the exhaust ports of each exhaust path of the engine, and continuing for a fifth preset time period; the fifth preset time period may be 5 minutes.

[0122] Step S2226, stop supplying the preset dry gas from the pump inlet of the engine, and close the shaft cooling outlet valve of the engine.

[0123] Regarding step S223, a preset dry gas is filled into the inner cavity of the engine to perform positive pressure protection on the engine, and the positive pressure protection pressure may be 0.1-0.3 MPa.

[0124] In summary, after the engine thermal test is completed, the embodiment of the present application opens the various discharge paths of the engine, and injects preset dry gas from the pump inlet, thrust chamber head cavity and generator head cavity of the engine for at least a first preset time to blow out the inner cavity of the engine; injects preset dry gas from the blind cavity of the gas path of the engine for at least a second preset time to blow out the blind cavity of the gas path of the engine; after the engine is blown and rewarmed, the target point of the engine is tested for dew point until the detection result of the dew point detection meets the preset conditions. It can be seen that the embodiment of the present application provides a simple and efficient liquid engine thermal test post-processing method, which not only blows out the inner cavity of the engine, but also blows out the blind cavity of the engine, thereby improving the blowing effect of the engine. On the one hand, the embodiment of the present application simplifies the engine thermal test post-processing process and shortens the engine thermal test cycle. On the other hand, the engine inner cavity and the engine blind cavity are blown out at the same time, thereby improving the blowing effect of the engine and greatly improving the reusability of the engine. In addition, the thermal test post-processing method used in the embodiment of the present application usually takes only a few hours, which simplifies the engine thermal test post-processing process, can greatly shorten the engine thermal test processing cycle, and ensure that the engine is delivered to the rocket on schedule. At the same time, the embodiment of the present application performs positive pressure protection after the engine is blown off, which can fully eliminate adverse factors during the storage of the engine, prevent water vapor in the environment from entering the engine, and improve the reliability and reusability of the engine during the later thermal test process.

[0125] Now through a blow-off example, combined with Figure 4 The flow chart shown illustrates the thermal test post-processing method provided in the above-mentioned embodiment of the present application.

[0126] (1) After the engine heat test is completed, the engine cavity is blown out and reheated using heated nitrogen.

[0127] After the engine hot test is completed, open the engine drain valve and the shaft cooling drain valve, fill the engine pump inlet, thrust chamber head cavity and generator head cavity with heated nitrogen at a pressure of 1MPa and a temperature of 60-70℃, and blow out and reheat the engine inner cavity for 2 hours.

[0128] (2) During the engine blowdown and rewarming process, the blind cavity of the engine gas path is blown away.

[0129] After the engine is blown off and rewarmed for 1 hour in step (1), the engine gas circuit is blown off, including the gas circuit pressure pipe at the engine gas circuit pressure measuring point, the starting circuit and the ignition channel of the gunpowder igniter. The specific method is as follows:

[0130] (a) Disconnect the connection between the gas line pressure measuring point sensor and the gas line pressure pipe. The pressure measuring points include but are not limited to the thrust chamber pressure, generator pressure, turbine inlet pressure and turbine outlet pressure. Blow nitrogen from the gas line pressure pipe interface into the engine cavity. The blowing pressure is 0.5MPa and the blowing time is 2 minutes. After the blowing is completed, restore the connection between the pressure sensor and the gas line pressure pipe. For engines ignited by a torch igniter, blow away the igniter-related pressure measuring points such as the igniter chamber pressure at the same time;

[0131] (b) If conditions permit, a purge port may be provided on the downstream pipeline of the engine starting valve. Otherwise, the pressure measuring point sensor on the downstream pipeline of the engine starting valve and the gas line pressure pipe may be disconnected, and nitrogen may be purged from the purge port or the gas line pressure pipe interface into the engine cavity. The purge pressure is 0.5 MPa and the purge time is 2 minutes. After the purge is completed, the above interface connection is restored;

[0132] (c) Remove the thrust chamber igniter housing and purge the thrust chamber ignition channel with nitrogen at a pressure of 0.5 MPa for 2 minutes. After the purge is completed, seal the thrust chamber ignition channel.

[0133] (d) Remove the generator igniter housing and purge the generator ignition channel with nitrogen at a pressure of 0.5 MPa for 2 minutes. After the purge is completed, seal the thrust chamber ignition channel.

[0134] (e) If the engine is ignited by a torch igniter, it is not necessary to purge the ignition passage in steps (c) and (d);

[0135] (3) Engine dew point detection:

[0136] The engine is tested for dew point. The specific method is as follows:

[0137] (a) Remove the air inlet plugs from the sealing fixtures for the engine thrust chamber outlet and exhaust pipe outlet;

[0138] (b) Maintain a nitrogen supply of 0.4 MPa at the engine pump inlet, open the engine main valve, and blow it out for 15 minutes;

[0139] (c) Connect a dew point detector to the inflation port on the thrust chamber sealing fixture to test the thrust chamber dew point;

[0140] (d) The thrust chamber dew point is acceptable if it is not higher than -45°C. If the thrust chamber dew point is unacceptable, disconnect the dew point detector and continue to purge the engine for 15 minutes until the thrust chamber dew point is acceptable.

[0141] (e) Close the main valve of the engine, open the secondary valve of the engine, and blow it for 10 minutes;

[0142] (f) Connect a dew point detector to the inflation port on the exhaust pipe sealing tooling to perform exhaust pipe dew point detection;

[0143] (g) The exhaust pipe dew point is qualified if it is not higher than -45℃. If the exhaust pipe dew point is unqualified, disconnect the dew point detector and continue to blow the engine for 15 minutes until the exhaust pipe dew point is qualified;

[0144] (h) Close the engine bypass valve, shut off the nitrogen supply to the engine pump inlet, and restore the sealing plug of the engine external interface;

[0145] (i) The dew point test after the engine hot test may be combined with the dew point test before the next hot test.

[0146] (4) The engine continues to perform a hot test. After the test is completed, steps (1) to (3) are executed. Otherwise, step (5) is executed.

[0147] (5) The engine is returned to the factory for purge and replacement. After purge and replacement, the engine cavity is filled with dry and clean gas to provide positive pressure protection for the engine:

[0148] The engine is restored to factory condition after being removed from the factory and then blown out and replaced. The specific method is as follows:

[0149] (a) Remove the gas inlet plugs from the thrust chamber outlet, exhaust pipe outlet, and drain outlet sealing fixtures;

[0150] (b) Maintain a nitrogen supply of 0.5 MPa at the engine pump inlet;

[0151] (c) Open the engine main valve, auxiliary valve and shaft cooling drain valve and blow for 5 minutes;

[0152] (d) Open the engine drain valve, close the engine main valve and auxiliary valve, install the air inlet plugs on the engine thrust chamber outlet and exhaust pipe outlet sealing tooling, and blow them away for 5 minutes;

[0153] (e) Open and close the engine drain valve, install the air inlet plug on the engine drain outlet sealing tool, and blow it out for 5 minutes;

[0154] (f) Turn off the nitrogen supply to the engine pump inlet, close the shaft cooling drain valve, and install the engine and the inflation port plug on the sealing tooling.

[0155] After the engine is blown off and replaced, 0.1-0.3MPa nitrogen is filled from the engine pump inlet, thrust chamber outlet and exhaust pipe outlet to provide positive pressure protection for the engine cavity during engine storage.

[0156] It can be seen from the above process that the post-treatment method for thermal testing provided in the embodiment of the present application can complete the blowing work in about 2 hours at the fastest, shortening the engine thermal testing treatment cycle and ensuring that the engine is delivered on schedule. The embodiment of the present application blows out the blind cavity of the engine, and its blowing effect is greatly improved. Positive pressure protection is performed during the idle period of the engine (when no thermal testing is performed), further reducing the possibility of corrosion inside the engine due to water vapor, ensuring good preservation quality of the engine.

[0157] Since the electronic device introduced in this embodiment is an electronic device used to implement the information processing method in the embodiment of the present application, based on the information processing method introduced in the embodiment of the present application, a person skilled in the art can understand the specific implementation of the electronic device of the present embodiment and its various variations, so how the electronic device implements the method in the embodiment of the present application is not described in detail here. As long as a person skilled in the art implements the electronic device used by the information processing method in the embodiment of the present application, it belongs to the scope of protection of this application.

[0158] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0159] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0160] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1A function specified in one or more boxes.

[0161] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0162] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0163] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A liquid engine thermal test post-processing method, characterized in that: The method comprises: After the engine heat test is completed, each drain path of the engine is opened, and a preset dry gas is injected from a pump inlet, a thrust chamber head cavity, and a generator head cavity of the engine for at least a first preset time period; Injecting a preset dry gas from a gas path blind cavity of the engine for at least a second preset time, the gas path blind cavity comprising a gas path pressure pipe, a starting path, a thrust chamber ignition channel, and a generator ignition channel of the engine; After the engine is blown off and rewarmed, a dew point detection is performed on a target point of the engine until a detection result of the dew point detection meets a preset condition.

2. The method according to claim 1, characterized in that After the engine is blown off and rewarmed, dew point detection is performed on a target point of the engine until a detection result of the dew point detection meets a preset condition, the method further includes: Continue to use the engine for the hot test until the engine hot test is completed; or, The engine is protected by positive pressure.

3. The method according to claim 2, characterized in that The positive pressure protection of the engine comprises: Restoring the engine to the factory state; Blowing and replacing the engine; A preset dry gas is filled into the inner cavity of the engine to provide positive pressure protection for the engine.

4. The method according to claim 3, characterized in that The blowing and replacing of the engine comprises: Opening the outlets of the engine, including the outlet of the thrust chamber, the outlet of the exhaust pipe, and the outlets of each outlet path; continuously supplying a preset dry gas at a preset pressure to an inner chamber of the engine from a pump inlet of the engine; Opening the main valve, the secondary valve and the shaft cooling outlet valve of the engine for a third preset time period; Opening the discharge valve of the engine, closing the main valve and the secondary valve of the engine, sealing the thrust chamber outlet and the exhaust pipe outlet of the engine, and continuing for a fourth preset time period; Closing the exhaust valve of the engine, closing the exhaust outlets of each exhaust path of the engine, and continuing for a fifth preset time period; The supply of the preset dry gas from the pump inlet of the engine is stopped, and the shaft cooling drain valve of the engine is closed.

5. The method according to claim 1, characterized in that The step of injecting a preset dry gas from the blind cavity of the gas path of the engine and continuing the injection of the preset dry gas for at least a second preset time period comprises: After the preset dry gas is injected from the pump inlet, thrust chamber head cavity and generator head cavity of the engine and continues for at least the fifth preset time period, the preset dry gas is injected from the gas path blind cavity of the engine and continues for at least the second preset time period; the first preset time period is greater than the fifth preset time period.

6. The method according to claim 1 or 5, characterized in that When the engine is ignited by a powder igniter during a heat test, the step of injecting a preset dry gas from the gas path blind cavity of the engine for at least a second preset time period includes: Disconnecting the connection between the gas line pressure measuring point sensor of the engine and the gas line pressure pipe, and injecting a preset dry gas into the inner cavity of the engine from the gas line pressure pipe interface for at least the second preset time period; Injecting a preset dry gas into the inner cavity of the engine from a downstream pipeline interface of a starting valve of the engine and continuing for at least the second preset time period; Removing the thrust chamber igniter housing of the engine, and injecting a preset dry gas from the thrust chamber ignition channel of the engine for at least the second preset time period; The generator igniter housing of the engine is removed, and a preset dry gas is injected from the generator ignition passage of the engine and lasts for at least the second preset time period.

7. The method according to claim 1 or 5, characterized in that When the engine is ignited by a torch igniter during a hot test, the step of injecting a preset dry gas from the gas path blind cavity of the engine and continuing for at least a second preset time period includes: Disconnecting the connection between the gas line pressure measuring point sensor of the flare igniter of the engine and the gas line pressure pipe, and injecting a preset dry gas into the inner cavity of the engine from the interface of the gas line pressure pipe for at least the second preset time; Disconnecting the connection between the gas line pressure measuring point sensor of the engine and the gas line pressure pipe, and injecting a preset dry gas into the inner cavity of the engine from the gas line pressure pipe interface for at least the second preset time period; Injecting a preset dry gas into the inner cavity of the engine from a downstream pipeline interface of a starting valve of the engine and continuing for at least the second preset time period; Removing the thrust chamber igniter housing of the engine, and injecting a preset dry gas from the thrust chamber ignition channel of the engine for at least the second preset time period; The generator igniter housing of the engine is removed, and a preset dry gas is injected from the generator ignition passage of the engine and lasts for at least the second preset time period.

8. The method according to claim 1, characterized in that After the engine is blown off and rewarmed, dew point detection is performed on a target point of the engine until the detection result of the dew point detection meets a preset condition, including: Remove the gas inlet plugs on the sealing tools corresponding to the thrust chamber outlet and the exhaust pipe outlet of the engine respectively; Injecting a preset dry gas from the pump inlet of the engine, opening the main valve of the engine, and continuing for a sixth preset time period; During the process of injecting the preset dry gas from the pump inlet of the engine, a dew point detector is connected to the gas charging port on the sealing tooling at the thrust chamber outlet of the engine to detect the dew point at the thrust chamber outlet of the engine; When the actual dew point value at the outlet of the thrust chamber of the engine is less than a preset threshold value, determining that the detection result of the dew point detection at the outlet of the thrust chamber of the engine meets a preset condition, and disconnecting the dew point detector connected to the outlet of the thrust chamber of the engine; When the actual dew point value at the outlet of the thrust chamber of the engine is greater than or equal to a preset threshold value, it is determined that the detection result of the dew point detection at the outlet of the thrust chamber of the engine does not meet the preset condition, and a preset dry gas is continuously injected from the pump inlet of the engine until it is determined that the detection result of the dew point detection at the outlet of the thrust chamber of the engine meets the preset condition, and the dew point detector connected to the outlet of the thrust chamber of the engine is disconnected.

9. The method according to claim 8, characterized in that After the engine is blown off and rewarmed, dew point detection is performed on a target point of the engine until the detection result of the dew point detection meets a preset condition, including: During the process of injecting the preset dry gas from the pump inlet of the engine, opening the secondary valve of the engine and closing the primary valve of the engine for a seventh preset time period; Connecting a dew point detector to the air filling port on the sealing tooling at the exhaust pipe outlet of the engine to perform dew point detection on the exhaust pipe outlet of the engine; When the actual dew point value at the exhaust pipe outlet of the engine is less than a preset threshold value, determining that the detection result of the dew point detection at the exhaust pipe outlet of the engine meets a preset condition, and disconnecting the dew point detector connected to the exhaust pipe outlet of the engine; When the actual dew point value at the exhaust pipe outlet of the engine is greater than or equal to a preset threshold value, it is determined that the detection result of the dew point detection at the exhaust pipe outlet of the engine does not meet the preset condition, and the preset dry gas is continuously injected from the pump inlet of the engine until it is determined that the detection result of the dew point detection at the exhaust pipe outlet of the engine meets the preset condition, the dew point detector connected to the exhaust pipe outlet of the engine is disconnected, the bypass valve of the engine is closed, and the injection of the preset dry gas from the pump inlet of the engine is stopped.

10. The method according to claim 1, characterized in that The default drying gas is nitrogen.

Images