CN107063615A - A kind of single gravel erosion combustion gas big gun experimental rig - Google Patents

Abstract

The invention relates to the test field of gravel impact of aircraft engine blades, especially a gas cannon test device for single gravel erosion, comprising an air chamber, an elastic air bag, a gun barrel, and a gas injection ignition system; the gas injection ignition system includes a connecting elastic The gas injection pipe of the airbag, the gas inlet and air inlet connected to the gas injection pipe, the electric spark plug for ignition, the pressure sensor for detecting the pressure inside the elastic airbag, and the controller; the controller is used to receive the pressure signal transmitted by the pressure sensor and to Control the activation of the electric spark plug and the opening and closing of the throttle valve. The test device can control the basic energy of the detonation shock wave through the ratio and pressure of the injected gas and air mixture, and calibrate and fine-tune the pressure of launching the projectile to the preset speed through the balance chamber. The instantaneous pressure generated by the detonation shock wave is sufficient to make the The projectile is lifted to a supersonic speed greater than 400m/s, and the invention can realize the gravel speed required in the blade test through a simple structure.

Description

A gas cannon test device for single gravel erosion

technical field

The invention relates to the technical test field of aircraft, in particular to a high-speed impact test device for aircraft engine blades.

Background technique

At present, the high-speed impact test of a single gravel is required for helicopter engine blades. The energy density of the existing free-expanding air cannon air source is not enough to accelerate the gravel to about supersonic (400m/s), so it is difficult to obtain high-speed impact of gravel. Accurate impact test data on helicopter engine blades.

And in the relevant technical field, existing high-velocity gas cannon comprises: 1, the cannon driven by gunpowder gas, the general launch velocity is at 1-2km/s, belongs to the equipment that military equipment field uses. 2. Two-stage or multi-stage light gas guns, with a firing speed exceeding 3km/s, which belong to the equipment used in the fields of high-energy physics and ultra-high-speed collisions. The relative speed of research in the field of aero-engine foreign object swallowing is generally in the transonic-supersonic region, so the above two high-speed air cannons are not applicable, and the above-mentioned equipment has a complex structure and high risk.

Therefore, a new technical solution is needed to solve the above problems.

Contents of the invention

Purpose of the invention: In order to solve the above problems, provide a small-scale gas cannon test device using gas detonation as the power of the launch gas source, which can control the basic energy of the detonation shock wave through the ratio and pressure of the injected gas and air mixture. The balance chamber calibrates and fine-tunes the pressure to launch the projectile to a preset velocity.

Technical solution: In order to achieve the above object, the present invention can adopt the following technical solutions:

A gas cannon test device for single gravel erosion, comprising a gas chamber, an elastic air bag located in the gas chamber, a pressure relief balance chamber connected to the front end of the gas chamber, a gun barrel connected to the pressure relief balance chamber and extending forward, located on the gun barrel The projectile filling section, gas injection ignition system; the gas injection ignition system includes a gas injection pipe connected to the elastic airbag and through the air outlet chamber with a throttle valve, a gas inlet and an air inlet connected to the gas injection pipe, and an electric spark plug for ignition 1. A pressure sensor for detecting the pressure inside the elastic airbag, and a controller; wherein the controller is used to receive the pressure signal transmitted by the pressure sensor and to control the activation of the electric spark plug and the opening and closing of the throttle valve.

Beneficial effects: the gas cannon test device for single gravel erosion provided by the present invention is mainly used in the blade test of helicopters or other aircraft that need to have engine blades. Among them, the basic energy of the detonation shock wave can be controlled by the ratio and pressure of the injected gas and air mixture, and the pressure of launching the projectile to the preset speed is calibrated and fine-tuned through the balance chamber. The instantaneous pressure generated by the detonation shock wave is enough to make the projectile Increased to a supersonic speed greater than 400m/s, the invention can realize the gravel velocity required in the blade test through a simple structure, and the replacement of projectiles and elastic airbags is very convenient, which is conducive to improving the test efficiency. By controlling the basic energy of the detonation shock wave through the ratio and pressure of the injected gas and air mixture, the required projectile velocity can be adjusted, and the simulation of sand and gravel impacting the blade at different speeds can be realized, which improves the versatility.

Further, the gas injection ignition system further includes a gas injection distribution valve, and the gas injection distribution valve is also controlled by a controller.

Further, the projectile loading section includes a translation fast-loading ring sleeved on the gun barrel, and the gun barrel is provided with an opening at a position corresponding to the translation fast-loading ring; That is, it is used to load projectiles, and after the projectiles are loaded, the fast-loading ring is moved in translation to return to the original position to close the opening; the projectile loading section also includes a projectile holder located in the opening.

Further, the outlet of the gun barrel is provided with a hydraulic damping block type bullet holder separator.

Further, it also includes a bracket with a slide rail, and the bracket with a slide rail is used to carry the air chamber, the pressure relief balance chamber, the gun barrel, and the gas injection ignition system.

Further, the air chamber includes an air chamber rear cover for opening and closing the inner cavity of the air chamber, a trigger platform is embedded in the air chamber rear cover, and the electric spark plug and the pressure sensor are installed on the trigger platform , and the opening of the elastic airbag is wrapped on the triggering platform and the opening of the elastic airbag is stuck on the triggering platform by buckling.

And the present invention also provides a kind of technical scheme of the control method of above-mentioned gas cannon test device:

The gas injection distribution valve and the throttle valve are controlled by the controller to inject a mixture of gas and air into the elastic airbag as a combustible gas, and the air chamber is used as a mold-preserving cavity. The pressure sensor detects the real-time air pressure in the elastic airbag, and the real-time air pressure reaches the set pressure. At this time, the controller controls the electric spark plug to ignite, and the combustible mixture in the elastic airbag detonates to generate a shock wave, which reaches the calibrated pressure in the pressure relief balance chamber, pushing the projectile to launch.

Description of drawings

Fig. 1 is the structural view of the gas cannon test device for single gravel erosion of the present invention.

detailed description

Please refer to Figure 1, a single gas cannon test device for gravel erosion, including a gas chamber 1, an elastic air bag 2 located in the gas chamber, a pressure relief balance chamber 3 connected to the front end of the gas chamber 1, and a pressure relief balance chamber 3 And the gun barrel 4 extending forward, the projectile loading section 5 positioned on the gun barrel 4, the gas injection ignition system, the hydraulic damping block type bullet rest separator 6 positioned at the gun barrel outlet, and the slide rail support 7. The bracket 7 with slide rails is used to carry the air chamber 1, the pressure relief balance chamber 3, the gun barrel 4, and the gas injection ignition system. Wherein, the gas injection ignition system includes a gas injection pipe 81 connected to the elastic airbag 2 and passing through the air outlet chamber 1 with a throttle valve 82, a gas inlet 83 and an air inlet 84 connected to the gas injection pipe 81, and an electrical circuit located in the elastic airbag 2. A spark plug 85, a pressure sensor 86 and a controller 87 (in this embodiment, the controller is a PRC controller) are also located in the elastic airbag 2 . The controller 87 is used to receive the pressure signal transmitted by the pressure sensor 86 and to control the activation of the electric spark plug 85 and the opening and closing of the throttle valve 82 . The gas injection ignition system also includes a gas injection distribution valve 88, the gas injection distribution valve 88 is also controlled by the controller 87 to adjust the ratio of the gas and air entering the elastic airbag 2 to form different ratios of combustible mixed gas.

The control method of the above-mentioned gas cannon test device is to control the gas injection distribution valve 88 and the throttle valve 82 to inject gas and air mixture gas into the elastic air bag 2 as combustible gas through the controller 87, and the gas chamber 1 is used as a mold-preserving cavity. The sensor 86 detects the real-time air pressure in the elastic airbag 2. When the real-time air pressure reaches the set pressure, the controller 87 controls the electric spark plug 85 to ignite, and the combustible mixture in the elastic airbag 2 detonates to generate a shock wave, reaching the calibration pressure in the pressure relief balance chamber , to promote projectile 9 (projectile is to simulate the debris that aircraft blades such as sand and gravel in reality may encounter) to launch. Wherein, the elastic airbag 2 is made of thin-walled combustible material.

In this embodiment, the gas cannon test device is used for single gravel impact, that is, the gravel shot out in one test is single, and new gravel can be reloaded after shot out. In order to achieve this effect, the projectile loading section 5 includes a translation fast-loading ring 51 sleeved on the gun barrel 4, and the gun barrel 4 is provided with an opening at a position corresponding to the translation fast-loading ring 51; when the translation fast-loading ring 51 is moved along When the gun barrel 4 translates and opens relative to the opening, it is used to load the projectile 9, and after the projectile 9 is filled, the translation quick-loading ring 51 returns to the closed opening. The projectile loading section 5 also includes a projectile holder 52 located in the opening for carrying positioning projectiles 9 . The inner side of the translation fast installation ring 51 is provided with a nitrile rubber sealing ring 53 for sealing between the translation quick installation ring 51 and the gun barrel 4 .

And similarly, the air chamber 1 includes an air chamber back cover 11 for opening and closing the inner chamber of the air chamber 1, the air chamber back cover 11 is embedded with a trigger platform 12, the electric spark plug 85 and the pressure sensor 86 are all installed on the trigger platform 12, and the opening of the elastic airbag 2 is wrapped on the trigger platform 12 and the opening of the elastic airbag is stuck on the trigger platform 12 through the buckle 13. Buckle 13 also plays a role in sealing the elastic airbag 2, and the elastic airbag 2 can be replaced quickly by the buckle 13. When a new projectile is loaded after a test, it also needs to be replaced with a new elastic airbag 2 to enter the next trials. The air chamber rear cover 11 is fixed on the air chamber main body by a hinge 14 and a buckle 15, and a tetrafluoroethylene sealing ring 16 is provided on the inner surface of the air chamber rear cover 11 to seal the inner cavity of the air chamber.

The gas cannon test device for single gravel erosion provided by the present invention is mainly used in the blade test of helicopters or other aircraft that need to have engine blades. Among them, the basic energy of the detonation shock wave can be controlled by the ratio and pressure of the injected gas and air mixture, and the pressure of launching the projectile to the preset speed is calibrated and fine-tuned through the balance chamber. The instantaneous pressure generated by the detonation shock wave is enough to make the projectile Increased to a supersonic speed greater than 400m/s, the invention can realize the gravel velocity required in the blade test through a simple structure, and the replacement of projectiles and elastic airbags is very convenient, which is conducive to improving the test efficiency.

In addition, there are many specific implementation methods and approaches of the present invention, and the above descriptions are only preferred implementation modes of the present invention. It should be pointed out that those skilled in the art can make some improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. All components that are not specified in this embodiment can be realized by existing technologies.

Claims (7)

1. A gas cannon test device for single gravel erosion, characterized in that it comprises an air chamber, an elastic air bag positioned in the air chamber, a pressure relief balance chamber connected to the front end of the air chamber, a pressure relief balance chamber connected with the pressure relief balance chamber and extending forward. Tube, projectile loading section on the barrel, gas injection ignition system; The gas injection ignition system includes a gas injection pipe connected to the elastic airbag and passing through the air outlet chamber with a throttle valve, a gas inlet and an air inlet connected to the gas injection pipe, an electric spark plug for ignition, and a pressure sensor for detecting the pressure inside the elastic airbag. Sensors and controllers; the controller is used to receive the pressure signal transmitted by the pressure sensor and to control the activation of the electric spark plug and the opening and closing of the throttle valve. 2. The gas cannon test device according to claim 1, wherein the gas injection ignition system further comprises a gas injection distribution valve, and the gas injection distribution valve is also controlled by a controller. 3. The gas cannon test device according to claim 1 or 2, characterized in that: the projectile loading section includes a translation fast-loading ring sleeved on the gun barrel, and the gun barrel is provided at a position corresponding to the translation fast-loading ring. There is an opening; when the translational quick-loading ring moves along the barrel and opens relative to the opening, it is used to load projectiles, and after the projectiles are loaded, the translational quick-loading ring returns to close the opening; the projectile loading section also includes a bullet holder located in the opening . 4. The gas cannon test device according to claim 3, characterized in that: the exit of the gun barrel is provided with a hydraulic damping block type bullet holder separator. 5. The gas cannon test device according to claim 4, characterized in that: it also includes a bracket with slide rails, and the bracket with slide rails is used to carry the gas chamber, the pressure relief balance chamber, the gun barrel, and the gas injection ignition system. 6. The gas gun test device according to claim 5, characterized in that: the gas chamber includes a gas chamber rear cover for opening and closing the inner chamber of the gas chamber, and a trigger platform is embedded in the gas chamber rear cover , the electric spark plug and the pressure sensor are installed on the trigger platform, and the opening of the elastic airbag is wrapped on the trigger platform, and the opening of the elastic airbag is stuck on the trigger platform by buckling. 7. According to the control method of the gas cannon test device described in any one of claims 1 to 6, it is characterized in that: the gas injection distribution valve and the throttle valve are controlled by the controller to inject gas and air mixed gas into the elastic air bag as a possible Gas, the air chamber is used as a mold-preserving cavity, and the pressure sensor detects the real-time air pressure in the elastic airbag. When the real-time air pressure reaches the set pressure, the controller controls the electric spark plug to ignite, and the combustible mixture in the elastic airbag detonates to generate shock waves. The calibrated pressure is reached in the cavity, pushing the projectile to launch.