Pressure testing device for muzzle flow field of barrel weapon

Abstract

The utility model relates to the field of weapon launch testing systems, in particular to a pressure testing device for a muzzle flow field of a barrel weapon. The device comprises a base, a bracket, a pressure sensor mounting mechanism and a pressure sensor, the bracket is fixedly mounted on the base; the pressure sensor mounting mechanism is arranged on the bracket and is used for mounting a pressure sensor and adjusting the angle of the pressure sensor; two groups of pressure sensor mounting mechanisms and pressure sensors are arranged, and the height of a symmetric line between the two groups of pressure sensors is consistent with the height of the center line of the muzzle. Compared with the prior art, the device is simple in structure and small in size, reduces additional interference to a flow field of the bore port as much as possible, can accurately monitor the pressure of the bore port, and further analyzes interference characteristics of the ground to shock waves of the bore port.

Description

Technical Field

[0001] The utility model relates to the field of weapon firing test systems, in particular to a pressure test device for the muzzle flow field of a barreled weapon. Background Art

[0002] With the rapid development of science and technology and the continuous evolution of modern warfare, the testing of modern weapons has become an important part of the research and development of military equipment. Historical experience shows that every major breakthrough in weapon technology is accompanied by a major breakthrough in the corresponding testing technology. The test field test of barreled weapons is a method of testing the performance of weapon systems in a real environment. By implementing various test items, such as stress and strain measurement, dynamic pressure measurement, heat flux measurement, noise measurement, motion parameter test, vibration measurement, and muzzle flow field measurement, we can fully understand the performance of weapon systems in actual battlefield environments, evaluate the performance of weapon systems under various complex conditions, and provide important basis for weapon development and use. Among them, the transient pressure test of key characteristic points in the muzzle flow field is one of the means to study the development characteristics of the muzzle flow field. The muzzle flow field will bring initial disturbances to the flight of the projectile, reduce the shooting accuracy of the projectile, and increase the dispersion of the projectile's landing point. The core velocity in the gunpowder gas jet generally exceeds 2000m / s, acting on the tail of the projectile at a relative speed of 3-5 Mach numbers, causing the projectile to continue to accelerate. For projectiles with initial attack angles or asymmetric tail fins, the influence of muzzle gunpowder gas flow field is more serious. Therefore, the experimental and theoretical research on the muzzle flow field of artillery is of great significance to improving the design accuracy and striking performance of projectiles.

[0003] For large-caliber artillery tests in open spaces, there is currently no unified muzzle flow field transient pressure test device. The muzzle flow field is a three-dimensional circumferentially symmetrical spherical structure, so the transient pressure changes of the four upper, lower, left and right monitoring points symmetrical about the central axis should be consistent in theory. In order to provide an experimental basis for theoretical research, it is necessary to uniformly monitor the monitoring points with the same transient pressure changes during the test. If the artillery is close to the ground, the reflection of the muzzle shock wave by the ground makes the transient pressure changes of the lower monitoring point and the upper monitoring point different. In order to study the interference law of the ground on the muzzle flow field, it is even more necessary to monitor the transient pressure of the upper and lower monitoring points symmetrically centered on the central axis.

[0004] However, the muzzle pressure test device in the prior art can only simply measure the transient pressure change of a single monitoring point, or its measuring position cannot maintain a consistent distance from the muzzle line of fire. The measuring method is simple, the measuring device is large in size, and the additional interference to the muzzle flow field is large. In addition, most measurements have no theoretical basis as support, and it is impossible to determine a reasonable monitoring position. The measurement process cannot achieve a refined description of the three-dimensional structural characteristics of the muzzle flow field. Therefore, the design and use of a test device that can simultaneously monitor the pressure changes of the upper and lower monitoring points symmetrical with the central axis is very necessary. Utility Model Content

[0005] The utility model aims to provide a testing device for transient pressure changes in the muzzle flow field when a barreled weapon is fired close to the ground. The test requires monitoring points that are symmetrical up and down (with the axis of the muzzle as the center line). Under the premise of minimizing the additional interference of the testing device to the muzzle flow field, the problem of verifying and comparing the transient pressures of symmetrical monitoring points in the muzzle flow field is solved.

[0006] A technical solution for achieving the purpose of the utility model: a device for testing the flow field pressure of a gun muzzle, comprising a base, a bracket, a pressure sensor mounting mechanism and a pressure sensor; the bracket is fixedly mounted on the base; the pressure sensor mounting mechanism is mounted on the bracket and is used to mount the pressure sensor and adjust the angle of the pressure sensor; the pressure sensor mounting mechanism and the pressure sensor are provided in two groups, and the height of the symmetry line between the two groups of pressure sensors is consistent with the height of the muzzle centerline.

[0007] Furthermore, the bracket has two groups of holes for respectively installing sensor mounting mechanisms.

[0008] Furthermore, the two groups of hole groups on the bracket are axially symmetrically installed, and the symmetry axis is highly consistent with the muzzle center line.

[0009] Furthermore, the number of holes in each group of holes is ≥2.

[0010] Furthermore, the sensor installation mechanism includes a slider and a connecting block; the slider is fixedly installed in the hole group on the bracket, the connecting block is fixedly installed on the slider according to the required angle, and the sensor is installed in the connecting block.

[0011] Furthermore, the measuring angle of the sensor is perpendicular to the section of the muzzle wavefront at the monitoring point.

[0012] Furthermore, the slider has a block structure with a through hole in the middle, which is sleeved on the bracket, and the side wall of the slider is provided with a mounting hole for fixing the slider, the connecting block and the bracket with screws.

[0013] Furthermore, a connection block fixing portion and a sensor mounting portion are provided on the connection block; the connection block fixing portion of the connection block is fixedly connected to the slider and the bracket by screws.

[0014] Compared with the prior art, the utility model has the following significant advantages:

[0015] (1) The pressure test device for the muzzle flow field of a barreled weapon when it is fired close to the ground provided by the utility model has a simple structure and a small volume, and can reduce additional interference to the muzzle flow field as much as possible;

[0016] (2) The pressure testing device provided by the utility model can simultaneously measure the transient pressure changes of monitoring points that are symmetrical up and down (with the axis of the muzzle as the center line), and can realize the experimental verification and comparison needs of academic research on the interference characteristics of the muzzle shock wave on the monitoring surface;

[0017] (3) The bracket in the pressure testing device of the utility model has multiple threaded holes and can be disassembled and replaced to meet the testing requirements of different symmetrical points;

[0018] (4) The slider and the connecting block in the pressure testing device of the utility model can be connected at different angles to ensure that the sensor can be perpendicular to the muzzle shock wave front no matter where the testing device is placed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a pressure testing device for a gun muzzle flow field according to the utility model;

[0020] Figure 2 It is a front view of the pressure testing device for the muzzle flow field of a gun according to the utility model;

[0021] Figure 3 It is a three-dimensional diagram of a slider of the utility model for a pressure test device for a gun muzzle flow field;

[0022] Figure 4 It is a three-dimensional diagram of the connection block of the pressure testing device for the gun muzzle flow field of the utility model;

[0023] Figure 5 It is a three-dimensional diagram of a slide block and a connecting block of a pressure testing device for a gun muzzle flow field of the utility model;

[0024] Figure 6 It is the meridian pressure cloud diagram of the numerical simulation of the muzzle flow field of the barreled weapon near the ground;

[0025] Figure 7 It is a graph showing the change of muzzle pressure over time at two upper and lower symmetrical monitoring points (with the muzzle centerline as the symmetry axis) in a gun firing test of the muzzle flow field pressure test device of the utility model; DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] like Figure 1-Figure 7 As shown, the utility model is a pressure testing device for the muzzle flow field of a gun, which is placed on the ground at a distance in front of the muzzle. The pressure testing device includes a base 1, a bracket 2, an upper slider 3, an upper connecting block 4, a lower slider 5, a lower connecting block 6, an upper sensor 7, and a lower sensor 8.

[0028] The base 1 is square, with a short threaded rod 9 in the middle for mounting the bracket 2; the bracket 2 is a round tube, with the lower end connected to the base 1 by a thread; the bracket 2 has an upper threaded hole group 10 and a lower threaded hole group 11, the upper slider 3 and the bracket 2 are connected by bolts through a threaded hole in the upper threaded hole group 10, and the lower slider 5 and the bracket 2 are connected by bolts through a threaded hole in the lower threaded hole group 11;

[0029] The upper connecting block 4 is connected to the upper sliding block 3, and the angle adjustment and fixation of the upper connecting block 4 are achieved by screws, so that the sensor measurement direction is perpendicular to the section of the muzzle shock wave front at this monitoring point; the lower connecting block 6 is connected to the lower sliding block 5, and can also be fixed at different angles; the upper sensor 7 is placed in the upper connecting block 4 and tightened by bolts; the lower sensor 8 is placed in the lower connecting block 5 and tightened by bolts to fix the sensor.

[0030] The upper threaded hole group 10 and the lower threaded hole group 11 on the bracket 2 are installed axially symmetrically, and the height of the symmetry axis from the bottom surface is consistent with the height of the muzzle center line from the ground.

[0031] Furthermore, the upper sensor 7 and the lower sensor 8 are free field pressure sensors EPE type KD2002L-02.

[0032] Further, the number of holes in the upper threaded hole group 10 and the lower threaded hole group 11 is ≥ 2;

[0033] The height of the upper connecting block 4 and the lower connecting block 6 from the bottom surface is consistent with the height of the muzzle center line from the ground.

[0034] like Figure 3 As shown, the upper slider 3 and the lower slider 5 have the same structure, which is a block structure with a through hole in the middle, and is sleeved on the bracket 2. The side walls of the upper slider 3 and the lower slider 5 are provided with mounting holes for fixing the slider (referring to the upper slider 3 or the lower slider 5), the connecting block (referring to the upper connecting block 4 or the lower connecting block 6) and the bracket 2 with screws.

[0035] like Figure 4As shown, the upper connecting block 4 and the lower connecting block 6 have the same structure, and a connecting block fixing portion and a sensor mounting portion are provided on the connecting block; the connecting block fixing portion of the connecting block is fixedly connected to the slider and the bracket by screws. The sensor mounting portion is used to install and fix the sensor (referring to the upper sensor 7 or the lower sensor 8).

[0036] Based on the above muzzle flow field pressure test device, the specific steps for studying the change of muzzle flow field pressure when the barrel weapon is fired close to the ground are as follows:

[0037] S1: Determine the test parameters of barreled weapons;

[0038] The structural parameters, internal ballistic loading parameters, firing parameters and firing indexes of the barreled weapon are determined as the initial conditions for the numerical simulation calculation.

[0039] S2: Establish the coordinate system for the test site and simulation analysis of barreled weapons;

[0040] Determine the height h of the muzzle center from the ground as the boundary condition of the numerical simulation calculation. Take the muzzle center of the tested gun as the origin, the projectile flight direction as the x-axis, the vertical ground upward as the y-axis, and the vertical xy plane as the z-axis;

[0041] S3: Based on the muzzle shock wave theory, the reflection phenomenon of the muzzle flow field encountering the ground is analyzed, and then a simulation analysis is performed.

[0042] S3.1: The pressure, density, and velocity of the gas after the shock wave is reflected normally from the ground can be determined by the following relationship:

[0043]

[0044] The pressure, density and velocity of the gas after the shock wave is reflected obliquely on the ground can be determined by the following relationship:

[0045]

[0046]

[0047] The gas behind the incident wavefront is at pressure p1, density ρ1, wave velocity D1, particle velocity q1, and Mach number M1. The gas state behind the reflected shock wave is at pressure p2, density ρ2, wave velocity D2, particle velocity q2, and Mach number M2. The angle between the reflected shock wavefront and the ground is

[0048] If the velocity component of the flow perpendicular to the wall is obtained after the reflected wave, it will cause the contact point (triple point) between the incident wave and the reflected wave to move outward from the wall. At this time, a third shock wave and a Mach wave will be formed, and its front extends from the triple point downward to the wall, and is perpendicular to the wall when it approaches the wall. It can be seen that the muzzle shock wave encounters the ground and undergoes direct reflection, oblique reflection and Mach reflection, generating a reflected shock wave and a Mach rod, and at the same time forming a high-pressure area above the ground. It can be predicted that the pressure below the muzzle is greater than the pressure above the muzzle.

[0049] S4: perform numerical simulation calculation of muzzle flow field and analyze the simulation results of muzzle shock wave;

[0050] S4.1: According to the simulation results, select the pressure monitoring points in the test and arrange them at the key characteristic points that can reflect the ground effect, that is, in the high pressure area and at the position of the Mach rod, and determine the horizontal and vertical coordinates of the monitoring points;

[0051] S4.2: According to the selected monitoring point, determine the section angle of the muzzle shock wave front, that is, according to the three-dimensional numerical simulation results, obtain the propagation direction of the muzzle shock wave, keep the sensor direction consistent with the propagation direction, and measure the total pressure parameters in the pressure field.

[0052] S5: According to the position of the pressure monitoring point determined in the above steps, install and adjust the pressure testing device and adjust the installation angle of the pressure sensor;

[0053] During installation, the height of the symmetry line between the upper connecting block 4 and the lower connecting block 6 from the ground is consistent with the height of the center line of the test gun muzzle from the ground. Place the upper slider 3 and the lower slider 5 at the heights to be measured respectively and tighten them. Connect the upper connecting block 4 and the lower connecting block 6 to the upper slider 3 and the lower slider 5 respectively with bolts, and fix the upper sensor 7 and the sensor 8 in the upper connecting block 4 and the lower connecting block 6 respectively, so that the measurement angle of the sensor is perpendicular to the section of the muzzle wavefront at the monitoring point.

[0054] S6: Conduct a test to obtain the muzzle pressure at the monitoring point;

[0055] By monitoring the transient pressure signal through the test system, the pressure change curve of the upper and lower symmetrical monitoring points (with the axis of the muzzle as the center line) over time is obtained.

[0056] S7: Analysis results. The influence of the ground on the development and evolution characteristics of the muzzle flow field shock wave is obtained by combining theory, numerical simulation and experiment. That is, the flow field structure that should be symmetrical in the circumference is distorted, the pressure below the muzzle is higher than the pressure above, a Mach rod structure is generated above the ground, and a local high-pressure area is generated.

[0057] Example:

[0058] In this embodiment, in order to test and analyze the muzzle pressure in front of a large-caliber balanced gun, the coordinates of the selected monitoring points are (5000, 500, 500) mm and (5000, -500, 500) mm; Figure 5 and Figure 6 As shown, Figure 5 Meridian pressure cloud diagram of the pressure numerical simulation of the muzzle flow field of a large-caliber balanced gun; Figure 6 The curves of pressure variation with time at the two monitoring points are as follows. This test was conducted close to the ground. By comparison, we can see that the ground has an impact on the development and evolution of the muzzle flow field, causing the pressure in the lower part of the flow field to be higher than the pressure in the upper part.

[0059] The utility model provides a muzzle flow field pressure testing device for barreled weapons during close-to-ground firing, which has a simple structural design principle, is easy to implement, is economical and practical, reduces additional interference to the muzzle flow field, and can simultaneously measure transient changes in pressure at upper and lower symmetrical monitoring points (with the muzzle axis as the center line), so as to study the influence of the ground on the muzzle flow field during close-to-ground firing, conduct accurate experimental verification and comparison, and achieve good test results.

[0060] The above is a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the essence and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A pressure test device for the muzzle flow field of a barreled weapon, characterized in that: The device includes a base, a bracket, a pressure sensor mounting mechanism and a pressure sensor; the bracket is fixedly mounted on the base; the pressure sensor mounting mechanism is mounted on the bracket and is used to mount the pressure sensor and adjust the angle of the pressure sensor; the pressure sensor mounting mechanism and the pressure sensor are provided in two groups, and the height of the symmetry line between the two groups of pressure sensors from the bottom surface is consistent with the height of the muzzle center line from the ground.

2. The pressure testing device for the muzzle flow field of a barreled weapon according to claim 1, characterized in that: The bracket has two groups of holes for installing sensor installation mechanisms respectively.

3. The pressure testing device for the muzzle flow field of a barreled weapon according to claim 2, characterized in that: The two groups of holes on the bracket are axially symmetrically installed, and the symmetry axis is highly consistent with the muzzle center line.

4. The pressure testing device for the muzzle flow field of a barreled weapon according to claim 2, characterized in that: The number of holes in each group of holes is ≥ 2.

5. The pressure testing device for muzzle flow field of a barreled weapon according to claim 1, characterized in that: The sensor installation mechanism includes a slider and a connecting block; the slider is fixedly installed in a hole group on the bracket, the connecting block is fixedly installed on the slider according to a required angle, and the sensor is installed in the connecting block.

6. The pressure testing device for muzzle flow field of a barreled weapon according to claim 1, characterized in that: The measuring angle of the sensor is perpendicular to the section of the muzzle wavefront at the monitoring point.

7. The pressure testing device for the muzzle flow field of a barreled weapon according to claim 5, characterized in that: The slider has a block structure with a through hole in the middle and is sleeved on the bracket. The side wall of the slider is provided with mounting holes for fixing the slider, the connecting block and the bracket with screws.

8. The pressure testing device for muzzle flow field of a barreled weapon according to claim 5, characterized in that: The connecting block is provided with a connecting block fixing part and a sensor mounting part; the connecting block fixing part of the connecting block is fixedly connected with the sliding block and the bracket through screws.

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