Rapid cook-off test device for solid engine

Abstract

A solid engine quick cook-off test device is characterized in that a tested solid engine is placed above an oil tank through a fixing device, fuel in the oil tank is ignited by an ignition system to generate flame, and the flame is enabled to directly face the outer surface of the solid engine to heat; the environment temperature monitoring system is used for monitoring the environment temperature around the solid engine in the test process; the solid engine temperature monitoring system is used for monitoring the temperature of the surface and internal measuring points of the solid engine; the video monitoring system is used for recording the flame combustion condition in the rapid cook-off test process, the reaction condition of the solid engine, the working condition of each monitoring system measuring point and the working condition of the verification plate; the thermal infrared imager is used for recording radiation heat in the rapid cook-off test process; the ground and air shock wave overpressure monitoring system is used for monitoring shock wave overpressure generated when the solid engine reacts, and the verification plate is used for receiving impact of solid matter flying out when the solid engine reacts.

Description

Technical Field

[0001] The invention relates to a solid engine rapid baking test device, which is used to test the maximum heat flux, occurrence response time and result that a solid engine can safely withstand when directly exposed to a flame environment, and ultimately evaluate the safety performance of the solid engine in a rapid baking environment. Background Art

[0002] A solid engine is a power device that generates high-temperature and high-pressure combustion gas through the normal combustion of solid propellant, and the combustion gas is accelerated through the nozzle expansion to generate thrust. It is easy to use, simple to maintain, and can be stored for a long time, and is widely used in the field of missile weapons and aerospace vehicles. The solid propellant is an energetic substance that will undergo a stable and orderly combustion reaction under normal ignition. The temperature and gas generated by the combustion meet the requirements for the use of solid engines. However, when a solid engine is placed in an accident such as a fire, the solid propellant may react rapidly due to thermal stimulation such as the flame burning destroying the shell structure and the continuous fire accumulating heat, resulting in safety accidents such as combustion and explosion in the solid engine.

[0003] The rapid bake-off test is one of the important test projects in the field of solid motor safety research. During the test, the solid motor is placed at a certain height above the ground, the surface of the solid motor is continuously heated by fuel, and thermocouples, verification plates, overpressure sensors and video monitors are arranged around the solid motor to monitor the temperature, pressure, shell crushing and other conditions around the solid motor during the rapid bake-off test, and observe the response of the solid motor under thermal stimulation.

[0004] The existing standard QJ20153-2012 "Solid Propellant Rapid Cook-off Test Method" provides the rapid cook-off test principle and test method for solid propellants, such as Figure 1 As shown, it can be used to determine the response of the propellant under standard rapid combustion test conditions.

[0005] However, this method is only applicable to the rapid baking test of propellants. The solid motor used for charging in the standard has a diameter of only Φ100mm, and the barrel and end cover are made of carbon stainless steel and are a closed structure. This method is also not applicable to the current actual solid motor rapid baking test in terms of structural dimensions. For example, the solid motor in the standard is a cylindrical sealed structure, while the actual solid motor has spherical, ellipsoidal, cylindrical, conical, etc. and some protruding structures, which are not closed structures; the diameter of the solid motor in the standard is Φ100mm, while the diameter of the solid motor developed for actual application has a large span, which can reach Φ1000mm to Φ2000mm and above; the solid motor in the standard has a simple structure, only carbon stainless steel and propellant, while the actual solid motor has a complex structure such as composite material shell, metal parts, rubber layer, lining, propellant, etc.; the propellant of the solid motor in the standard is a solid structure, which is obviously different from the complex medicine structure of the actual solid motor propellant. In addition, the method of this standard is insufficient in applicability, accuracy and reliability.

[0006] Therefore, based on the actual development needs, a new solid engine rapid combustion test device was proposed for the rapid combustion test of solid engines. Summary of the invention

[0007] The technical problem to be solved by the present invention is: QJ20153-2012 "Solid Propellant Rapid Cooking Test Method" only provides a solid propellant rapid cooking test method, and the test specimens made of solid propellant are greatly different from the size, structure, material, composition, etc. of the solid engine developed for actual application. The present invention solves the problem that it cannot directly reflect the rapid cooking safety of the actual solid engine.

[0008] The purpose of the present invention is achieved through the following technical solutions:

[0009] A solid engine rapid cooking test device, comprising a fixing device, a fire baking device, an environmental temperature monitoring system, a solid engine temperature monitoring system, a video monitoring system, an infrared thermal imager, a ground shock wave overpressure monitoring system, an air shock wave overpressure monitoring system, and a verification board; the fire baking device comprises an oil tank, fuel, and an ignition system;

[0010] The solid motor under test is placed above the oil tank by a fixing device, and the fuel in the oil tank is ignited by an ignition system to generate a flame so that the flame heats the outer surface of the solid motor;

[0011] The ambient temperature monitoring system is used to monitor the ambient temperature around the solid motor during the test. If the solid motor reacts, the impact of the solid motor on the ambient temperature can be monitored.

[0012] The solid motor temperature monitoring system is used to monitor the temperature of the solid motor surface and internal measuring points. It can reflect the changes in the solid motor surface and internal temperature during the solid motor rapid burning test. If the solid motor reacts, the changes in the solid motor surface and internal temperature can be recorded.

[0013] The video monitoring system is used to record the flame combustion conditions, solid engine reaction conditions, working conditions of each monitoring system measurement point, and working conditions of the verification board during the rapid cooking test;

[0014] The infrared thermal imager is used to record the radiant heat during the rapid cooking test and to analyze the heating conditions of the solid motor;

[0015] The ground shock wave overpressure monitoring system is used to monitor the shock wave overpressure generated in the ground direction when the solid engine reacts. The air shock wave overpressure monitoring system is used to monitor the shock wave overpressure generated in the air direction when the solid engine reacts. The verification plate is used to receive the impact of solid matter flying out when the solid engine reacts.

[0016] A test method based on the solid motor rapid cooking test device comprises:

[0017] Surface temperature measuring points and internal temperature measuring points are arranged on the surface and inside of the solid engine; the surface temperature measuring points are evenly distributed in the vertical and horizontal directions along the solid engine equatorial spacing direction, and the internal temperature measuring points are arranged on the inner surface of the combustion chamber grain at the front, middle and rear of the inner hole, the bottom of the wing slot, the front opening and the rear opening;

[0018] Place the fixture in the center of the oil tank and fix it, slowly lift the solid engine onto the fixture and fix it;

[0019] Arrange temperature measuring points of the ambient temperature monitoring system in the horizontal direction and above the outside of the solid rocket;

[0020] Verification panels are arranged on the sides and front of the solid rocket in the horizontal direction. The size of the verification panels should cover the projected area of ​​the rocket in that direction.

[0021] Arrange ground and air shock wave overpressure monitoring systems, video monitoring systems, and infrared thermal imagers at the test site;

[0022] Check and confirm all monitoring systems and complete debugging;

[0023] Fill the tank with fuel and complete the ignition system layout;

[0024] After the personnel evacuated to a safe area, the ignition control system was activated;

[0025] The ignition system is unlocked, an ignition signal is sent, and the monitoring system is started at the same time. The fuel is ignited to produce a baking flame. The internal temperature of the solid engine rises due to the heat. The monitoring system starts to record data, and the rapid baking test begins;

[0026] The video monitoring system is used to observe whether the solid rocket engine reacts and whether flames or fireballs are produced. After confirming that the engine reaction is complete, the engine reaction level is determined through the verification plate, temperature, and shock wave overpressure data.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The present invention can conduct a rapid cooking test on a solid motor without using a sample characterization, so the cooking safety of the solid motor under test can be directly obtained;

[0029] (2) The present invention proposes a universal solid motor rapid cooking test method, which is generally applicable to various types of solid motors, and the test results can be compared and referenced with each other;

[0030] (3) The present invention can obtain the shock wave overpressure of the solid motor on the ground and in the air during the solid motor rapid burning test;

[0031] (4) The present invention can obtain the ambient temperature of the solid motor in the horizontal and vertical directions during the solid motor rapid burnout test;

[0032] (5) The present invention can obtain thermal radiation infrared imaging of solid motors during rapid cooking tests of solid motors;

[0033] (6) The present invention adopts a combination of internal and external temperature measurement points to more accurately monitor the temperature changes in the solid engine rapid combustion test, and can determine the location of the hot spot area inside the solid engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of a solid propellant rapid cooking test system in the prior art.

[0035] Figure 2 It is a schematic diagram of the solid motor rapid baking test system of the present invention.

[0036] Figure 3 It is a top view schematic diagram of the solid motor rapid baking combustion test system of the present invention.

[0037] Figure 4 Schematic diagram of the distribution of temperature measurement points inside the solid rocket engine in the present invention. DETAILED DESCRIPTION

[0038] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] A solid engine fast cooking test device, such as Figure 2 and Figure 3 As shown, it includes a fixing device, a fire roasting device (including an oil tank, fuel, and an ignition system), a ground shock wave overpressure monitoring system, an air shock wave overpressure monitoring system, an ambient temperature monitoring system, a solid engine temperature monitoring system, a verification board, a video monitoring system, an infrared thermal imager, etc.

[0040] Before the rapid cooking test, Figure 4 A solid engine temperature monitoring system is set up. Surface temperature measuring points are arranged on the surface of the solid engine case. The surface temperature measuring points are evenly distributed axially according to the spacing length of the solid engine case equator, and are arranged circumferentially in the horizontal and vertical directions. Internal temperature measuring points are arranged on the surface of the internal grain of the solid engine combustion chamber. The internal temperature measuring points are arranged at characteristic positions such as the front, middle and rear of the inner hole, the bottom of the wing slot, the front opening, and the rear opening.

[0041] When conducting a rapid baking test, the solid engine under test is placed above the oil tank via a fixing device, and the ignition system is used to ignite the fuel in the oil tank to generate a flame so that the flame heats the outer surface of the solid engine. At the beginning of ignition, each monitoring system is started and data is recorded.

[0042] The environmental temperature monitoring system is used to monitor the ambient temperature around the solid engine during the test. If the solid engine reacts, the impact of the solid engine on the ambient temperature can be monitored. The solid engine temperature monitoring system is used to monitor the temperature of the solid engine surface and internal measuring points. It can reflect the changes in the surface and internal temperature of the solid engine during the rapid baking test, and if the solid engine reacts, it can record the changes in the surface and internal temperature of the solid engine. The infrared thermal imager is used to record the radiant heat during the rapid baking test and analyze the heating conditions of the solid engine. The video monitoring system is used to record the flame combustion conditions, solid engine reaction conditions, working conditions of each monitoring system measuring point, and working conditions of the verification plate during the rapid baking test. The ground shock wave overpressure monitoring system is used to monitor the shock wave overpressure generated in the ground direction when the solid engine reacts. The air shock wave overpressure monitoring system is used to monitor the shock wave overpressure generated in the air direction when the solid engine reacts. The verification plate is used to receive the impact of flying solid matter when the solid engine reacts.

[0043] Through the environmental temperature monitoring system, solid engine temperature monitoring system, infrared thermal imager and video monitoring system, the location of hot spots inside the solid engine during the rapid baking test can be analyzed, as well as the internal and external temperature change patterns of the engine from heating to combustion or explosion.

[0044] The ground and air shock wave overpressure monitoring system and verification plate are used to determine the reaction level of the solid motor. If the verification plate has perforations, pits, plastic deformation, and significant shock wave overpressure is detected, it means that the solid motor has exploded. If the solid motor reaction produces flames, the verification plate is intact after the reaction, and no overpressure is detected, it is considered that the solid motor has burned.

[0045] A solid rocket rapid cooking test method, comprising:

[0046] 1. Transport the solid engine, fixture, fire baking device (including oil tank, fuel, ignition system), ground shock wave overpressure monitoring system, air shock wave overpressure monitoring system, ambient temperature monitoring system, solid engine temperature monitoring system, verification board, video monitoring system, infrared thermal imager, etc. used in the test to the test site;

[0047] 2. Arrange surface temperature measuring points and internal temperature measuring points on the surface and inside of the solid engine. Surface temperature measuring points are evenly distributed 3 to 10 in the vertical and horizontal directions along the solid engine equatorial spacing direction. Internal temperature measuring points are arranged on the inner surface of the combustion chamber grain at the front, middle and rear of the inner hole, the bottom of the wing slot, the front opening, the rear opening and other characteristic positions. Two measuring points are arranged at each characteristic position (one of which is a backup), and the solid engine temperature monitoring system is set up;

[0048] 3. Place the fixture in the center of the oil tank and fix it, slowly lift the solid engine onto the fixture and fix it;

[0049] 4. Arrange temperature measuring points of the ambient temperature monitoring system horizontally and above the outside of the solid engine, with the temperature measuring points 50 cm away from the surface of the solid engine;

[0050] 5. Place verification plates on the sides and front of the solid engine in the horizontal direction. The distance between the verification plates and the solid engine surface is 100 cm. The size of the verification plates should cover the engine projection area in that direction.

[0051] 6. Arrange ground and air shock wave overpressure monitoring systems, video monitoring systems, infrared thermal imagers, etc. at the test site;

[0052] 7. Check and confirm all monitoring systems and complete debugging;

[0053] 8. Pour fuel into the oil tank and complete the ignition system layout;

[0054] 9. After the personnel evacuate to the safe area, the ignition control system is activated;

[0055] 10. The ignition system is unlocked, an ignition signal is sent, and the monitoring system is started at the same time. The fuel is ignited to produce a fire flame. The internal temperature of the solid engine rises due to the heat. The monitoring system starts to record data, and the rapid burning test begins;

[0056] 11. Use the video monitoring system to observe whether the solid rocket engine reacts, whether flames or fireballs are generated, etc. After confirming that the engine reaction is complete, determine the engine reaction level through verification plates, temperature, shock wave overpressure data, etc.

[0057] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

[0058] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A solid engine rapid cooking test device, characterized in that: It includes a fixing device, a fire roasting device, an environmental temperature monitoring system, a solid engine temperature monitoring system, a video monitoring system, an infrared thermal imager, a ground shock wave overpressure monitoring system, an air shock wave overpressure monitoring system, and a verification board; the fire roasting device includes an oil tank, fuel, and an ignition system; The solid motor under test is placed above the oil tank by a fixing device, and the fuel in the oil tank is ignited by an ignition system to generate a flame so that the flame heats the outer surface of the solid motor; The ambient temperature monitoring system is used to monitor the ambient temperature around the solid motor during the test. If the solid motor reacts, the impact of the solid motor on the ambient temperature can be monitored. The solid motor temperature monitoring system is used to monitor the temperature of the solid motor surface and internal measuring points. It can reflect the changes in the solid motor surface and internal temperature during the solid motor rapid burning test. If the solid motor reacts, the changes in the solid motor surface and internal temperature can be recorded. The video monitoring system is used to record the flame combustion conditions, solid engine reaction conditions, working conditions of each monitoring system measurement point, and working conditions of the verification board during the rapid cooking test; The infrared thermal imager is used to record the radiant heat during the rapid cooking test and to analyze the heating conditions of the solid motor; The ground shock wave overpressure monitoring system is used to monitor the shock wave overpressure generated in the ground direction when the solid engine reacts. The air shock wave overpressure monitoring system is used to monitor the shock wave overpressure generated in the air direction when the solid engine reacts. The verification plate is used to receive the impact of solid matter flying out when the solid engine reacts.

2. The solid engine rapid cooking test device according to claim 1, characterized in that: Surface temperature measuring points are arranged on the surface of the solid motor case. The surface temperature measuring points are evenly distributed axially according to the spacing length of the solid motor case equator, and are arranged circumferentially in the horizontal and vertical directions.

3. The solid engine rapid cooking test device according to claim 1, characterized in that: Internal temperature measuring points are arranged on the surface of the internal grain of the solid motor combustion chamber. The internal temperature measuring points are arranged at the front, middle and rear of the inner hole, the bottom of the wing slot, the front opening and the rear opening.

4. The solid engine rapid cooking test device according to claim 1, characterized in that: Through the environmental temperature monitoring system, solid engine temperature monitoring system, infrared thermal imager and video monitoring system, it is possible to analyze the location of hot spots inside the solid engine during the rapid baking test, as well as the internal and external temperature changes of the engine from heating to combustion or explosion.

5. The solid engine rapid cooking test device according to claim 1, characterized in that: The ground shock wave overpressure monitoring system, the air shock wave overpressure monitoring system and the verification plate are used to determine the reaction level of the solid engine. If perforations, pits, and plastic deformations appear on the verification plate after the reaction, and significant shock wave overpressure is monitored, it means that the solid engine has exploded.

6. The solid engine rapid cooking test device according to claim 1, characterized in that: The ground shock wave overpressure monitoring system, the air shock wave overpressure monitoring system and the verification plate are used to determine the reaction level of the solid motor. If the solid motor reaction produces flames, the verification plate is intact after the reaction, and no overpressure is detected, it is considered that the solid motor is burning.

7. A test method based on the solid engine rapid cooking test device according to claim 1, characterized in that: include: Surface temperature measuring points and internal temperature measuring points are arranged on the surface and inside of the solid engine; the surface temperature measuring points are evenly distributed in the vertical and horizontal directions along the solid engine equatorial spacing direction, and the internal temperature measuring points are arranged on the inner surface of the combustion chamber grain at the front, middle and rear of the inner hole, the bottom of the wing slot, the front opening and the rear opening; Place the fixture in the center of the oil tank and fix it, slowly lift the solid engine onto the fixture and fix it; Arrange temperature measuring points of the ambient temperature monitoring system in the horizontal direction and above the outside of the solid rocket; Verification panels are arranged on the sides and front of the solid rocket in the horizontal direction. The size of the verification panels should cover the projected area of ​​the rocket in that direction. Arrange ground and air shock wave overpressure monitoring systems, video monitoring systems, and infrared thermal imagers at the test site; Check and confirm all monitoring systems and complete debugging; Fill the tank with fuel and complete the ignition system layout; After the personnel evacuated to a safe area, the ignition control system was activated; The ignition system is unlocked, an ignition signal is sent, and the monitoring system is started at the same time. The fuel is ignited to produce a baking flame. The internal temperature of the solid engine rises due to the heat. The monitoring system starts to record data, and the rapid baking test begins; The video monitoring system is used to observe whether the solid rocket engine reacts and whether flames or fireballs are produced. After confirming that the engine reaction is complete, the engine reaction level is determined through the verification plate, temperature, and shock wave overpressure data.

8. The test method according to claim 7, characterized in that: The solid motor external temperature measurement point shall be no less than 50 cm away from the solid motor surface.

9. The test method according to claim 7, characterized in that: The verification plate shall be no less than 100 cm away from the surface of the solid rocket.

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