CN114509229A - Shock tube with porous spacer and design method thereof - Google Patents
Shock tube with porous spacer and design method thereof Download PDFInfo
- Publication number
- CN114509229A CN114509229A CN202210142218.5A CN202210142218A CN114509229A CN 114509229 A CN114509229 A CN 114509229A CN 202210142218 A CN202210142218 A CN 202210142218A CN 114509229 A CN114509229 A CN 114509229A
- Authority
- CN
- China
- Prior art keywords
- section
- cover plate
- porous
- determining
- rear cover
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000035939 shock Effects 0.000 title claims abstract description 56
- 238000013461 design Methods 0.000 title claims abstract description 33
- 125000006850 spacer group Chemical group 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 31
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000002955 isolation Methods 0.000 claims abstract description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- 239000011148 porous material Substances 0.000 claims description 34
- 238000002474 experimental method Methods 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 8
- 239000007789 gas Substances 0.000 abstract description 26
- 238000005474 detonation Methods 0.000 abstract description 12
- 238000005192 partition Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 description 9
- 229910001369 Brass Inorganic materials 0.000 description 5
- 239000010951 brass Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000002360 explosive Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000002372 labelling Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 230000000916 dilatatory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention discloses a shock tube with a porous spacer and a design method thereof. An isolation diaphragm is fixedly arranged between the driving section and the porous spacing section through a front cover plate, and a main diaphragm is fixedly arranged between the porous spacing section and the expansion section through a rear cover plate. Porous partition section composed ofNThe front part of the circular hole is gradually reduced, the tail part of the circular hole is gradually enlarged, high-pressure nitrogen is filled into the circular hole in advance, the opening number, the opening position and the opening time of the circular through holes can be adjusted according to test requirements, the front cover plate and the rear cover plate are round table thin plates with similar structures, gradually reduced (gradually enlarged) circular holes corresponding to the circular hole are arranged on the surfaces of the front cover plate and the rear cover plate, and the gradually changing angle of the circular hole is consistent with the expanding angle of the expanding section. The invention effectively solves the problem of insufficient single diaphragm strength and pressure bearing capacity, improves the shock wave strength and the positive pressure duration time in the experimental section, and effectively avoids the detonation gas product from polluting the test gas.
Description
Technical Field
The invention belongs to the technical field of large-scale explosion wave simulation, and mainly relates to a shock tube with a porous spacer and a design method thereof.
Background
The large shock tube is a shock tube testing device capable of performing foot size experiments on most weaponry and engineering structures, is also called a large explosive wave simulation device, and mainly comprises a driving section and a driven section, wherein the driven section can be subdivided into a shaping section, an experimental section and an outlet section, and part of the shock tube device is also provided with an expansion section. A single large-diameter diaphragm with the same inner diameter as the driving section is usually arranged between the driving section and the driven section and used for sealing gas and improving the pressure of shock waves entering the experimental section.
In the existing shock tube, a driving section and a driven section are often separated only by a diaphragm, and after the diaphragm is broken, a large amount of high-temperature and high-pressure detonation gas products quickly rush into the driven section, so that test gas can be polluted. If the combustible gas is adopted for driving, the combustible gas can be caused to be continuously combusted after being filled into the driven section, which is unfavorable for the simulation of far-field explosion shock waves, can influence the test effect and has potential safety hazards. Meanwhile, with the increase of the requirement of large-scale and even full-size tests on weaponry, the pipe diameter of the shock tube is also increased continuously, the strength design requirement, the construction cost and the pressure bearing capacity of the single large-diameter diaphragm are difficult to meet the test requirement, and the isolation structure of the driving section and the driven section needs to be redesigned.
The existing mode for improving the shock wave strength in the shock wave tube experimental section is mainly to improve the explosive equivalent weight in the driving section, which puts higher requirements on the strength design of the driving section, so that the construction cost of the shock wave tube is increased, and certain potential safety hazards exist, therefore, a new mode is needed to be adopted to improve the shock wave strength in the experimental section.
In summary, it is necessary to design a shock tube structure with reasonable design and simple structure to solve the problem of insufficient single diaphragm strength and pressure bearing capability in the existing shock tube, further improve the shock wave strength and the positive pressure duration time in the experimental section, avoid the test gas from being polluted, and improve the test performance and the test effect of the shock tube device.
Disclosure of Invention
The invention aims to provide a shock tube with a porous spacer section, which effectively solves the problem of insufficient strength and pressure bearing capacity of a diaphragm in a single-diaphragm shock tube, can reduce the strength requirement on the front end part of a driving section, improves the shock wave strength and the positive pressure duration time in an experimental section under the condition of not increasing the explosive equivalent, effectively avoids detonation gas products from polluting test gas, can improve the test performance of a shock tube device, obtains better test effect and has good application prospect.
The technical solution for realizing the purpose of the invention is as follows: the utility model provides a shock tube of porous interval section in area, includes buffer segment, drive section, expansion section and the experiment section that connects gradually from the preceding back, adds porous interval section between drive section and expansion section to the preceding terminal surface at porous interval section links firmly the isolation diaphragm through the front shroud, and the rear end face links firmly the main diaphragm through the back shroud, the internal face smooth transition of porous interval section and expansion section.
The porous spacing section is a cylinder, N parallel circular pore channels are distributed along the direction of a central shaft, N is more than or equal to 1, the N circular pore channels are uniformly distributed around the central axis, and the circular pore channels are composed of a gradually reducing section, a straight section and an expanding section which are sequentially connected from front to back.
A method for designing a shock tube with a porous spacer comprises the following steps:
step 1, determining the diameter d and the length L of a driving section according to the test performance requirement of a shock tube device1Length L of porous spacer2The number N of circular pore canals in the porous spacing section and the distance r between the axis of the circular pore canals and the axis of the porous spacing section1Expansion angle alpha of expansion section, diameter D of experimental section and length L of experimental section4And the thickness l of the front cover plate4，
And (5) transferring to the step 2.
And 2, determining the radius r of the buffer section, and turning to the step 3.
Step 3, determining the length L of the expansion segment3And (5) turning to the step 4.
Compared with the prior art, the invention has the remarkable advantages that:
(1) the invention has clear and reasonable structural design, and the buffer section is arranged at the front end of the driving section, so that the pressure bearing of the front end part of the driving section can be effectively reduced.
(2) The porous spacer provided by the invention can realize the regulation of the shock wave intensity of the experimental section and prolong the positive pressure duration time of the shock wave by controlling the number, the position and the time of opening the circular pore channels; high-pressure nitrogen is pre-filled in the circular pore channel of the porous spacing section, so that detonation product gas and test gas can be isolated, the test gas is prevented from being polluted, and the shock wave strength and the positive pressure duration time in the experiment section can be improved.
(3) The invention arranges a reducing section at the front part of the circular pore canal of the porous spacing section, arranges a gradually expanding section at the tail part of the circular pore canal, and the reducing angle, the gradually expanding angle and the expanding angle of the expanding section are consistent, thereby improving the aerodynamic performance of the porous spacing section, reducing the generation of vortex and improving the intensity of shock wave in the experimental section.
(4) The invention designs a front cover plate and a rear cover plate which are respectively used for installing and fixing an isolation diaphragm and a main diaphragm, wherein the surface of the cover plate is provided with an opening with an inclination angle which is respectively in smooth transition with a gradually-reducing section and a gradually-expanding section of a circular pore passage in a multi-pore spacing section so as to optimize the aerodynamic performance.
Drawings
FIG. 1 is a schematic cross-sectional view of the general structure of a shock tube with a porous spacer according to the present invention.
FIG. 2 is a schematic cross-sectional view of a perforated spacer with front and back cover plates, an isolation diaphragm, and a main diaphragm.
FIG. 3 is a schematic diagram showing the structural parameters of the shock tube with porous spacer according to the present invention.
FIG. 4 is a schematic diagram of the porous spacer segment with front and rear cover plates, isolation diaphragms and main diaphragms in FIG. 3 with structural parameters labeled.
Fig. 5 is a schematic view of the front cover plate, wherein fig. (a) is a perspective view, fig. (b) is a plan view, and fig. (c) is a schematic view of structural parameter labeling.
Fig. 6 is a schematic view of the rear cover plate, wherein fig. (a) is a perspective view, fig. (b) is a plan view, and fig. (c) is a schematic view of structural parameter labeling.
1-buffer section, 2-driving section, 3-porous spacing section, 4-expanding section, 5-experimental section, 6-isolating diaphragm, 7-main diaphragm, 8-front cover plate, 9-rear cover plate, 3-1-reducing section, 3-2-straight section, 3-3-reducing section, r-buffer section radius, D-driving section diameter, D-experimental section diameter, alpha-expanding section expanding angle, L1Length of drive segment, L2Length of porous spacer, L3Length of the dilating segment, L4Length of the experimental section,/1Length of the tapering section,/2Length of the flat section,/3Divergent length, β1Angle of taper, β2Angle of divergent section, d1Diameter of straight section, d2-outer diameter of the tapered section, d4Outer diameter of the divergent section,/4Front cover thickness, θ1Front cover plate tapered through hole angle, d3Tapered through-hole outer diameter, d7Tapered through-hole inner diameter,/5-back cover thickness, θ2Rear cover plate divergent through hole angle, d8Gradually expanding the inner diameter of the through-hole, d5Gradually expanding the outer diameter of the through-hole, d6-a rear cover plate outer diameter.
Detailed Description
The present invention is further described with reference to the accompanying drawings by taking N ═ 4 as an example.
The invention discloses a shock tube with a porous spacer and a design method thereof, wherein the main body structure of the shock tube comprises a buffer section 1, a driving section 2, a porous spacer section 3, an expansion section 4 and an experiment section 5 which are sequentially connected from front to back. An isolation diaphragm 6 is fixedly installed between the driving section 2 and the porous spacing section 3 through a front cover plate 8, and a main diaphragm 7 is fixedly installed between the porous spacing section 3 and the expansion section 4 through a rear cover plate 9. Buffer segment 1 comprises a hemispherical enclosed construction, compares in traditional square drive section bottom structure, can effectively reduce drive section 2 front end pressure-bearing. The porous spacing section 3 consists of N circular pore passages with gradually reduced front parts and gradually expanded tail parts, the gradually reduced section is used for reducing the front part pressure bearing of the porous spacing section 3, the gradually expanded section is used for reducing the generation of internal vortexes at the tail part and the expanded section of the porous spacing section 3, the aerodynamic performance of the porous spacing section is optimized, and the loss of shock wave energy is reduced; high-pressure nitrogen is pre-filled into each circular pore channel, so that the purposes of improving the intensity and energy of shock waves can be achieved, detonation gas products generated in the driving section 2 and test gases in the expansion section 4 and the experiment section 5 can be isolated, and the test gases are prevented from being polluted and affecting the test effect; in the porous spacing section 3, the opening position, the number and the time of the circular through holes can be adjusted according to the test requirements, and the structure can prolong the positive pressure duration time of the shock waves in the experiment section 5; the front cover plate 8 is a circular thin plate, the rear cover plate 9 is similar to the front cover plate 8 in structure and is a circular truncated cone thin plate, M gradually-reducing and gradually-expanding circular holes corresponding to the circular through holes in the porous spacing section 3 are formed in the front cover plate, the front cover plate is connected with the main body structure of the porous spacing section 3 through bolts, and the front cover plate and the rear cover plate are respectively used for fixing the isolating diaphragm 6 and the main diaphragm 7 and optimizing aerodynamic performance; the expansion angle of the expansion section 4 is consistent with the tail divergent angle of the porous spacing section 3, and the aerodynamic performance can be optimized. The invention effectively solves the problem of insufficient strength and pressure bearing capacity of the diaphragm in the single-diaphragm shock tube, can reduce the strength requirement on the front end part of the driving section, improves the shock wave strength and the positive pressure duration time in the experimental section under the condition of not increasing the explosive equivalent, effectively avoids the detonation gas product from polluting the test gas, and can obtain better test effect.
The invention relates to a design method of a shock tube with multiple holes and short intervals, which comprises the following specific steps:
step 1, determining the diameter d and the length L of a driving section according to the test performance requirement of a shock tube device1Length L of porous spacer2The number N of circular pore canals in the porous spacing section and the distance r between the axis of the circular pore canals and the axis of the porous spacing section1 
Expansion angle alpha of expansion section, diameter D of experimental section and length L of experimental section4And the thickness l of the front cover plate4。
Step 2, determining the radius r of the buffer section 1 according to the geometric relationship,
step 3, determining the length L of the expansion segment according to the geometric relation3，
Step 4-1, according to the design requirement, the angle beta of the tapered section 3-11Gradually expanding section with 3-3 angle beta2The expansion angle alpha is equal to that of the expansion section 4, and beta is obtained1＝α、β2＝α。
Step 4-2, determining the angle theta of the tapered through hole of the front cover plate 8 according to design requirements and geometric relations1Can obtain theta1＝α。
Step 4-3, determining the diameter d of the straight section 3-2 of each circular hole channel according to the equal volume and geometric relationship between the total volume of each circular hole channel and the volume of the expansion section 4 in the design requirement1Since the lengths of the convergent section 3-1 and the divergent section 3-3 are small and can be ignored at this time, the length can be obtained
Step 4-4, determining the outer diameter d of the tapered through hole of the front cover plate 8 according to the geometric relationship3Obtaining d3＝d-2r1。
Step 4-5, determining the tapered section 3-1 length l1Is obtained by
Step 4-6, determining the length l of the gradually expanding section 3-3 according to the design requirement that the lengths of the gradually expanding section 3-1 and the gradually expanding section 3-3 are equal3Can obtain3＝l1。
Step 4-7, determining the length l of the circular hole straight section 3-2 according to the geometric relationship2Can obtain2＝L2-2l1。
Step 4-8, determining the outer diameter d of the tapered section 3-1 according to the geometric relationship2Obtaining d2＝d3-2·l4·tanβ1。
4-9, according to the design requirement, the smooth transition between the front cover plate 8 and the tapered section 3-1, determining the inner diameter d of the front cover plate 87Obtaining d7＝d2。
Step 4-10, determining the outer diameter d of the gradually expanding section 3-3 according to the design requirement that the outer diameters of the gradually expanding section 3-1 and the gradually expanding section 3-3 are equal4Obtaining d4＝d2。
And 4-11, opening holes at proper positions in the front of the front cover plate 8 and the porous spacing section 3, and connecting by using bolts.
Step 5-1, determining the gradually-expanded through hole angle theta of the rear cover plate 9 according to design requirements and geometric relations2Can obtain theta2＝α。
Step 5-2, determining the thickness l of the rear cover plate according to the design requirement that the thicknesses of the front cover plate 8 and the rear cover plate 9 are equal5Can obtain5＝l4。
Step 5-3, according to the design requirements, the rear cover plate 9 divergent through hole and the divergent section 3-3 are in smooth transition, and the inner diameter d of the rear cover plate divergent through hole is determined8Obtaining d8＝d4。
Step 5-4, determining the outer diameter d of the gradually-expanded through hole of the rear cover plate according to the geometric relation5Obtaining d5＝d3。
Step 5-5, determining the outer diameter d of the rear cover plate 9 according to the design requirement that the expansion angle of the rear cover plate 9 is consistent with the expansion angle of the expansion section 4 and the geometric relationship6Obtaining d6＝d+2·l5·tanθ2。
And 5-6, opening holes at proper positions on the rear cover plate 9 and the rear part of the porous spacing section 3, and connecting by using bolts.
Before the test, the number of circular pore passages needed to be used in the porous spacing section 3 is determined according to the requirements of overpressure and positive pressure duration of the shock wave in the test section in the test process. A brass sealing ring is placed at the left end of the reducing section 3-1, an isolation diaphragm 6 is placed on the left side of the brass sealing ring, a front cover plate 8 is installed and is fixedly connected with the main structure of the porous spacing section 3 through bolts, and the front cover plate 8 and the isolation diaphragm 6 are in close contact with the brass sealing ring. Similarly, a main diaphragm 7 is arranged at the right end of the divergent section 3-3, a brass sealing ring is arranged on the right side of the main diaphragm 7, and the rear cover plate 9 is fixedly connected with the main structure of the porous spacing section 3 through bolts, so that the main diaphragm 7, the brass sealing ring and the rear cover plate 9 are in close contact. Air in the circular pore channels is firstly pumped out through the reserved channels on the wall surfaces of the circular pore channels, and high-pressure nitrogen meeting the test requirements is filled in. And for the pore channels which are not needed to be used, the isolating membrane 6 is replaced by a membrane with high pressure-bearing capacity for sealing, and the air sealing treatment is carried out.
During the test, a large amount of detonation gas products are generated in the driving section 2, one part of detonation gas products are transmitted to the bottom of the driving section and enter the buffering section 1, then reflected shock waves are formed, and the other part of detonation gas products are transmitted to the porous spacing section 3. Because the pressure bearing capacity of the isolation diaphragm 6 is only slightly higher than the pressure of nitrogen in the circular pore channel, detonation gas products with high temperature and high pressure can easily burst the isolation diaphragm 6 and enter the circular pore channel 3-2. Due to the existence of the reducing section 3-1, detonation gas products can enter the circular pore canal 3-2 favorably, and the pressure on the left end face of the porous spacing section 3 is reduced. After the detonation gas product with high temperature and high pressure enters the circular pore channel, the high-pressure nitrogen in the compressed circular pore channel is pushed to form a shock wave which propagates downstream, and the nitrogen can be rapidly heated and pressurized by the shock wave. High-pressure gas is gathered in the circular hole 3-2, and the main diaphragm 7 is broken after the preset pressure is reached, or the main diaphragm 7 is broken by cutting and charging, or the two are combined to break the diaphragm. If there are channels left unused in the test, the sealing will continue throughout the test. High-temperature high-pressure gas breaks through the main diaphragm 7 and then continuously propagates to the downstream, and then sequentially enters the expansion section 4 and the experiment section 5.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. The utility model provides a shock tube of porous interval section in area, includes buffer segment (1), drive section (2), expansion section (4) and experiment section (5) that connect gradually from preceding backward, its characterized in that: the porous spacing section (3) is additionally arranged between the driving section (2) and the expansion section (4), the front end face of the porous spacing section (3) is fixedly connected with the isolation diaphragm (6) through the front cover plate (8), the rear end face of the porous spacing section is fixedly connected with the main diaphragm (7) through the rear cover plate (9), and the inner wall faces of the porous spacing section (3) and the expansion section (4) are in smooth transition.
2. The shock tube with a porous spacer according to claim 1, wherein: the porous spacing section (3) is a cylinder, N parallel circular pore channels are distributed along the direction of a central shaft, N is more than or equal to 1, the N circular pore channels are uniformly distributed around the central axis, and the circular pore channels are composed of a reducing section (3-1), a straight section (3-2) and an expanding section (3-3) which are sequentially connected from front to back.
3. The shock tube with a porous spacer according to claim 2, wherein: nitrogen is filled in the circular hole of the porous spacing section (3), and two ends of the porous spacing section are sealed through an isolation diaphragm (6) and a main diaphragm (7).
4. The shock tube with a porous spacer according to claim 3, wherein: front shroud (8) and back shroud (9) structure are the same, and it has M through-holes to open on the apron, the through-hole diameter gradually changes, and M equals N, through-hole and the circular pore smooth transition who connects.
5. A method for designing a shock tube with a porous spacer according to any one of claims 1 to 4, comprising the steps of:
step 1, determining the diameter d and the length L of a driving section according to the test performance requirement of a shock tube device1Length L of porous spacer2The number N of circular pore canals in the porous spacing section and the distance r between the axis of the circular pore canals and the axis of the porous spacing section1Expansion angle alpha of expansion section, diameter D of experimental section and length L of experimental section4And front cover thickness l4，
Turning to the step 2;
step 2, determining the radius r of the buffer section (1), and turning to step 3;
step 3, determining the length L of the expansion section (4)3Turning to step 4;
step 4, determining structural parameters of the porous spacing section (3), the front cover plate (8) and the rear cover plate (9), wherein the method comprises the following steps: diameter d of straight section of round pore canal of porous spacing section1And length l2The outer diameter d of the tapered section2Outer diameter d of the divergent section4Front cover plate reducing through hole external diameter d3And an inner diameter d7Turning to step 5;
step 5, determining structural parameters in the rear cover plate (9), including the outer diameter d of the gradually-expanded through hole of the rear cover plate5Inner diameter d8Thickness of the rear cover plate l5And the outer diameter d of the rear cover plate6。
6. The method for designing a shock tube with a porous spacer according to claim 5, wherein in step 2, the radius r of the buffer section (1) is determined as follows:
determining the radius of the buffer section (1) according to the geometrical relationship
7. The method for designing a shock tube with a porous spacer according to claim 6, wherein in step 3, the length L of the expanded section (4) is determined3The method comprises the following steps:
determining the length of the expanded segment according to the geometric relationship
8. The method for designing a shock tube with a porous spacer according to claim 7, wherein in step 4, determining structural parameters of the porous spacer (3), the front cover plate (8) and the rear cover plate (9) comprises: diameter d of the straight section (3-2) of the round pore passage of the porous spacing section1And length l2The outer diameter d of the reducing section (3-1)2A length l of the reducing section (3-1)1The outer diameter d of the divergent section (3-3)4Length l of the divergent section (3-3)3Front cover plate reducing through hole external diameter d3Rear cover plate gradually-expanding through hole outer diameter d5And the outer diameter d of the rear cover plate6The method comprises the following steps:
step 4-1, according to the design requirement, reducing the angle beta of the section (3-1)1Angle beta of divergent section (3-3)2Is equal to the expansion angle alpha of the expansion section (4) to obtain beta1＝α、β2＝α；
Step 4-2, determining the angle theta of the tapered through hole of the front cover plate (8) according to design requirements and geometric relationship1To obtain theta1＝α；
Step 4-3, determining the diameter d of the straight section (3-2) of each circular hole channel according to the equal volume and the geometric relationship between the total volume of each circular hole channel and the volume of the expansion section (4) in the design requirements1Neglecting the lengths of the convergent section (3-1) and the divergent section (3-3)Degree of rotation to obtain
Step 4-4, determining the outer diameter d of the tapered through hole of the front cover plate (8) according to the geometric relationship3D is obtained3＝d-2r1；
Step 4-5, determining the length l of the tapered section (3-1) according to the geometric relationship and the design requirement1To obtain
Step 4-6, determining the length l of the divergent section (3-3) according to the design requirement that the lengths of the convergent section (3-1) and the divergent section (3-3) are equal3Obtaining l3＝l1；
Step 4-7, determining the length l of the circular hole straight section (3-2) according to the geometric relationship2Obtaining l2＝L2-2l1；
Step 4-8, determining the outer diameter d of the tapered section (3-1) according to the geometric relationship2D is obtained2＝d3-2·l4·tanβ1；
4-9, according to the design requirement, the smooth transition between the front cover plate (8) and the tapered section (3-1) is carried out, and the inner diameter d of the front cover plate (8) is determined7D is obtained7＝d2；
Step 4-10, determining the outer diameter d of the gradually expanding section (3-3) according to the design requirement that the outer diameters of the gradually expanding section (3-1) and the gradually expanding section (3-3) are equal4D is obtained4＝d2；
And 4-11, opening holes at proper positions in the front of the front cover plate (8) and the front part of the porous spacing section (3), and connecting by using bolts.
9. The method for designing a shock tube with porous spacers as claimed in claim 8, wherein in step 5, determining structural parameters in the back cover plate (9) comprises: inner diameter d of gradually-enlarged through hole8Gradually expanding the outer diameter d of the through hole5Thickness l5And an outer diameter d6The method comprises the following steps:
step 5-1, determining the gradually-expanded through hole angle theta of the rear cover plate (9) according to design requirements and geometric relations2Availability of θ2＝α；
Step 5-2, determining the thickness l of the rear cover plate according to the design requirement that the thicknesses of the front cover plate (8) and the rear cover plate (9) are equal5Obtaining l5＝l4；
Step 5-3, according to the design requirements, the rear cover plate (9) divergent through hole and the divergent section (3-3) are in smooth transition, and the inner diameter d of the rear cover plate divergent through hole is determined8D is obtained8＝d4；
Step 5-4, determining the outer diameter d of the gradually-expanded through hole of the rear cover plate according to the geometric relation5D is obtained5＝d3；
Step 5-5, determining the outer diameter d of the rear cover plate (9) according to the design requirement that the expansion angle of the rear cover plate (9) is consistent with the expansion angle of the expansion section (4) and the geometric relationship6D is obtained6＝d+2·l5·tanθ2；
And 5-6, opening holes at proper positions at the rear parts of the rear cover plate (9) and the porous spacing section (3), and connecting by using bolts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210142218.5A CN114509229A (en) | 2022-02-16 | 2022-02-16 | Shock tube with porous spacer and design method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210142218.5A CN114509229A (en) | 2022-02-16 | 2022-02-16 | Shock tube with porous spacer and design method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114509229A true CN114509229A (en) | 2022-05-17 |
Family
ID=81551888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210142218.5A Pending CN114509229A (en) | 2022-02-16 | 2022-02-16 | Shock tube with porous spacer and design method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114509229A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091065A (en) * | 2013-01-14 | 2013-05-08 | 中国人民解放军总参谋部工程兵科研三所 | Shock wave tunnel for hypersonic air vehicle ground simulation test |
| CN106401796A (en) * | 2016-12-06 | 2017-02-15 | 中国科学技术大学 | Shockwave tube |
| CN106525611A (en) * | 2016-11-08 | 2017-03-22 | 中国工程物理研究院总体工程研究所 | An explosion wave model apparatus with adjustable shock wave waveforms |
| CN206146763U (en) * | 2016-11-08 | 2017-05-03 | 中国工程物理研究院总体工程研究所 | Shock wave wave form adjustable blast wave model device |
| CN106895739A (en) * | 2017-03-09 | 2017-06-27 | 北京理工大学 | Mix the three-level light-gas gun of detonation driven based on hydrogen-oxygen |
| CN109956520A (en) * | 2019-03-04 | 2019-07-02 | 江苏科技大学 | A kind of two-stage cavitation generator of composite construction |
| CN113465931A (en) * | 2021-06-09 | 2021-10-01 | 西安交通大学 | Variable cross-section shock wave induced ultra-low pressure self-ignition experimental device and method |
| CN113484026A (en) * | 2021-06-23 | 2021-10-08 | 上海交通大学 | Shock wave focusing ignition and corresponding ignition characteristic measuring device and method |
-
2022
- 2022-02-16 CN CN202210142218.5A patent/CN114509229A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091065A (en) * | 2013-01-14 | 2013-05-08 | 中国人民解放军总参谋部工程兵科研三所 | Shock wave tunnel for hypersonic air vehicle ground simulation test |
| CN106525611A (en) * | 2016-11-08 | 2017-03-22 | 中国工程物理研究院总体工程研究所 | An explosion wave model apparatus with adjustable shock wave waveforms |
| CN206146763U (en) * | 2016-11-08 | 2017-05-03 | 中国工程物理研究院总体工程研究所 | Shock wave wave form adjustable blast wave model device |
| CN106401796A (en) * | 2016-12-06 | 2017-02-15 | 中国科学技术大学 | Shockwave tube |
| CN106895739A (en) * | 2017-03-09 | 2017-06-27 | 北京理工大学 | Mix the three-level light-gas gun of detonation driven based on hydrogen-oxygen |
| CN109956520A (en) * | 2019-03-04 | 2019-07-02 | 江苏科技大学 | A kind of two-stage cavitation generator of composite construction |
| CN113465931A (en) * | 2021-06-09 | 2021-10-01 | 西安交通大学 | Variable cross-section shock wave induced ultra-low pressure self-ignition experimental device and method |
| CN113484026A (en) * | 2021-06-23 | 2021-10-08 | 上海交通大学 | Shock wave focusing ignition and corresponding ignition characteristic measuring device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3179083A1 (en) | Asymmetric exhaust nozzle for gas turbine engine | |
| CN110926825B (en) | High-altitude platform test air inlet process guide pipe | |
| CN109322761B (en) | high-Mach-number in-flight engine annular combustion chamber and spiral oblique detonation combustion method | |
| CN106524165A (en) | Ejector of gas cooker | |
| CN114509229A (en) | Shock tube with porous spacer and design method thereof | |
| CN101280973B (en) | Gaseous supersonic speed heating device and heating method thereof | |
| CN109357884B (en) | Thrust measuring device for head air inlet solid fuel ramjet | |
| CN116593116A (en) | High-pressure hydrogen driver for reducing risk of hydrogen damage | |
| CN109884243B (en) | Ultrasonic jet nozzle with active cooling large heat flow | |
| CN101303178B (en) | Pneumatic gas heating device and gas heating method | |
| CN108826356B (en) | Combustion chamber for fuel cell turbine composite simulation test | |
| CN107476898A (en) | A kind of air-breathing pulse detonation engine suppresses the structure of combustion gas forward pass | |
| RU165215U1 (en) | GAS TANK OF A LIQUID ROCKET ENGINE WITH AFTERING THE GENERATOR GAS. | |
| CN107044326A (en) | A kind of nuclear power generating sets muffler | |
| CN210423884U (en) | High-temperature valve capable of reducing temperature difference stress | |
| CN207363957U (en) | A kind of diffusion plate of turbocharger | |
| CN206972342U (en) | A kind of nuclear power generating sets muffler | |
| CN107956562A (en) | A kind of gasoline engine noise suppressor | |
| CN206267939U (en) | A kind of gas extraction system with accelerating tube and silencing function | |
| CN114877374B (en) | Integrated afterburner support plate and afterburner using same | |
| CN112983676B (en) | Solid rocket engine combustion chamber grain | |
| CN208619206U (en) | A kind of noise elimination pack housing with relief hole | |
| CN112318876B (en) | 3D prints silencing device | |
| CN220435770U (en) | Impedance type muffler for high-pressure pipeline | |
| CN112177797B (en) | Solid rocket engine without spray pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |