CN108627629A - Method for determining overpressure peak value of axial and radial shock waves of cylindrical explosive - Google Patents
Method for determining overpressure peak value of axial and radial shock waves of cylindrical explosive Download PDFInfo
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- 239000002360 explosive Substances 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000035939 shock Effects 0.000 title claims abstract description 17
- 238000004364 calculation method Methods 0.000 claims abstract description 4
- 238000005474 detonation Methods 0.000 claims description 54
- 238000009530 blood pressure measurement Methods 0.000 claims description 3
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/22—Fuels; Explosives
- G01N33/227—Explosives, e.g. combustive properties thereof
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- G—PHYSICS
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/14—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force of explosions; for measuring the energy of projectiles
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Abstract
The invention discloses a method for determining an overpressure peak value of axial and radial shock waves of a cylindrical explosive, which comprises the following steps of: (10) obtaining original parameters: acquiring original parameters of the cylindrical explosive, including the overall dimension, the mass, the explosive type and the overpressure calculation distance; (20) calculating intermediate parameters: calculating intermediate parameters of the cylindrical explosive according to the original parameters, wherein the intermediate parameters comprise equivalent TNT mass, proportional burst length and length-diameter ratio; (30) determining an overpressure peak value: and calculating to obtain the overpressure peak values of the axial shock waves and the radial shock waves of the cylindrical explosive according to the intermediate parameters and an overpressure peak value fitting formula. The method for determining the overpressure peak value of the axial and radial shock waves of the cylindrical explosive is not only suitable for cylindrical explosives with one end being detonated, but also suitable for cylindrical explosives with the center being detonated, and meanwhile, when the length-diameter ratio is changed, the result is accurate and reliable.
Description
Technical field
The invention belongs to explosive performance test ing technical fields, are especially applicable not only to the cylinder explosive of one end detonation,
Be also applied for center detonation cylinder explosive, meanwhile, when draw ratio becomes, as a result accurately, reliable cylinder explosive axial direction
Radial impact wave peak overpressure determines method.
Background technology
When being designed with the structure and design explosive test scheme of antiknock requirement, or estimate the influence size of the attack of terrorism
When, the power for estimating explosive charge is highly important.The explosive of cylindrical shape is common, cylinder on civilian and military
There is very big difference in the peak overpressure that body explosive charge generates, on different spatial positions especially when apart from closer
It waits, peak overpressure is exactly that the air pressure of explosion generation subtracts the maximum value after atmospheric pressure.It summarizes and has the study found that ratio
It is quick-fried away from approximately greater than 4m/kg1/3After, explosive shape can just ignore the influence that peak overpressure is distributed substantially, you can with
The shock wave overpressure peak generated with the spherical explosive of phase homogenous quantities is for estimating cylinder explosive charge power.
The shock wave overpressure peak predictor formula of existing cylinder explosive is mainly by being fitted a large amount of experimental data
It gets, is mainly used for estimating the shock wave overpressure peak at different distance in axially and radially both direction.
Existing cylinder peak overpressure predictor formula is substantially polynomial formRadially very
Rare formula considers the influence of draw ratio (L/D), the influence of no formula consideration draw ratio in axial direction.The cylinder of different draw ratios
The shock wave overpressure peak distribution that body explosive generates is clearly to have differences, draw ratio for radial peak overpressure influence compared with
It is small, it is very big for axial peak overpressure influence, but due to the discreteness of field test data, length is considered in fitting formula
Diameter than influence it is relatively difficult, the reason for causing test data discreteness big has that experimental enviroment is complicated and changeable, explosive property is unstable
It is fixed etc..In addition the existing experiment for being fitted cylinder explosive peak overpressure predictor formula is all one end detonation, without center
The measurement of detonation is tested, also without the peak overpressure predictor formula of center detonation.
Therefore, problem of the existing technology is：It is fried that existing shock wave overpressure peak determines that method is only used for cylinder
The peak overpressure prediction of medicine one end detonation, it is impossible to be used in the peak value prediction of center detonation；Existing axial direction peak overpressure prediction technique
In do not account for the influence of draw ratio, when draw ratio changes, as a result accuracy is poor.
Invention content
The purpose of the present invention is to provide cylinder explosive axial-radial shock wave overpressure peaks to determine method, is not only applicable in
In the cylinder explosive of one end detonation, and it is also applied for the cylinder explosive of center detonation, meanwhile, when draw ratio becomes, knot
Fruit is accurate, reliable.
Realize that the technical solution of the object of the invention is：
A kind of cylinder explosive axial-radial shock wave overpressure peak determines method, includes the following steps：
(10) initial parameter obtains：Obtain cylinder explosive initial parameter, including appearance and size, quality, explosive type,
Superpressure calculates distance；
(20) intermediate parameters calculate：According to initial parameter, the intermediate parameters of cylinder explosive are calculated, including equivalent
TNT mass, ratio are quick-fried away from, draw ratio；
(30) peak overpressure determines：According to intermediate parameters and peak overpressure fitting formula, cylinder explosive axis is calculated
To with radial impact wave peak overpressure.
Compared with prior art, the present invention its remarkable advantage is：
1, applied widely：The peak overpressure predictor formula of the cylinder explosive of center detonation axially and radially is provided,
It is applicable not only to the cylinder explosive of one end detonation, and is also applied for the cylinder explosive of center detonation；
2, result is more acurrate：The influence that draw ratio is considered in axial peak overpressure predictor formula, when draw ratio becomes, knot
Fruit is accurate, reliable.
Description of the drawings
Fig. 1 is that axially and radially shock wave overpressure peak determines the main flow chart of method to cylinder explosive of the present invention.
Fig. 2 is to use the radial peak overpressure of cylinder explosive one end detonation and draw ratio determined by the method for the present invention for 1/
The comparison diagram of 1 test data
Fig. 3 is to use the radial peak overpressure of cylinder explosive one end detonation and draw ratio determined by the method for the present invention for 4/
The comparison diagram of 1 test data
Fig. 4 is using cylinder explosive one end detonation axial proximal peak overpressure and draw ratio determined by the method for the present invention
For the comparison diagram of 1/1 test data
Fig. 5 is using cylinder explosive one end detonation axial proximal peak overpressure and draw ratio determined by the method for the present invention
For the comparison diagram of 4/1 test data
Fig. 6 is using cylinder explosive one end detonation axial distal end peak overpressure and draw ratio determined by the method for the present invention
For the comparison diagram of 1/1 test data
Fig. 7 is using cylinder explosive one end detonation axial distal end peak overpressure and draw ratio determined by the method for the present invention
For the comparison diagram of 4/1 test data
Fig. 8 is to use the radial peak overpressure of cylinder explosive center detonation and draw ratio determined by the method for the present invention for 1/
The comparison diagram of 1 to 4/1 analogue data
Fig. 9 is to use the axial peak overpressure of cylinder explosive center detonation and draw ratio determined by the method for the present invention for 1/
The comparison diagram of 1 to 4/1 analogue data
Figure 10 is the schematic diagram of cylinder explosive difference measurement direction.
Figure 11 is the detonation of cylinder explosive center and one end detonation schematic diagram.
Specific implementation mode
As shown in Figure 1, cylinder explosive axial-radial shock wave overpressure peak of the present invention determines method, including walk as follows
Suddenly：
(10) initial parameter obtains：Obtain cylinder explosive initial parameter, including appearance and size, quality, explosive type,
Superpressure calculates distance；
(20) intermediate parameters calculate：According to initial parameter, the intermediate parameters of cylinder explosive are calculated, including equivalent
TNT mass, ratio are quick-fried away from, draw ratio；
It is described that ((20) intermediate parameters calculate step：
(21) equivalent TNT Mass Calculations：According to the corresponding TNT equivalent coefficients k of explosive type, equivalent TNT is calculated as follows
Quality W,
W=k × m,
In formula, m is the quality of cylinder explosive, unit kg；
(22) distance R is calculated according to superpressure, it is quick-fried away from Z to be calculated as follows ratio,
In formula, W is equivalent TNT mass, and R is distance of the pressure measurement point apart from explosive geometric center, unit m.
(30) peak overpressure determines：According to intermediate parameters and peak overpressure fitting formula, cylinder explosive axis is calculated
To with radial impact wave peak overpressure.
(30) peak overpressure determines that step includes：
(31) radial peak overpressure calculates：The radial impact of the detonation of cylinder explosive center and one end detonation is calculated as follows
Wave peak overpressure, unit kPa,
(32) detonation axial peak overpressure in center calculates：The axial impact wave of center detonation cylinder explosive is calculated as follows
Peak overpressure, unit kPa,
(33) detonation axial distal end peak overpressure in one end calculates：Be calculated as follows one end detonation cylinder explosive axially away from
The peak overpressure of fire point one end：
PAxis, one end=1.4PAxis, center,
(34) detonation axial proximal peak overpressure in one end calculates：Be calculated as follows one end detonation cylinder explosive axially adjacent to
The peak overpressure of fire point one end：
PAxis, one end=0.5PAxis, center,
In above-mentioned formula, Z is that ratio is quick-fried away from draw ratio L/D, L is the height of cylinder, and D is the straight of cylinder bottom surface circle
Diameter, a, b are mediants, and e is scientific notation symbol, P0It is atmospheric pressure.
It is described that ((20) intermediate parameters calculate step：
(21) equivalent TNT Mass Calculations：According to the corresponding TNT equivalent coefficients k of explosive type, equivalent TNT is calculated as follows
Quality W,
W=k × m,
In formula, m is the quality of cylinder explosive, unit kg；
(22) distance R is calculated according to superpressure, it is quick-fried away from Z to be calculated as follows ratio,
In formula, W is equivalent TNT mass, and R is distance of the pressure measurement point apart from explosive geometric center, unit m.
To verify effectiveness of the invention and accuracy, below with using the different modes detonation of the method for the present invention determination
The experimental data that peak overpressure is respectively 1/1 and 4/1 with draw ratio compares.
Figure 10 is the schematic diagram of cylinder explosive difference measurement direction.
Figure 11 is the detonation of cylinder explosive center and one end detonation schematic diagram.
Fig. 2 is to use the radial peak overpressure of cylinder explosive one end detonation and draw ratio determined by the method for the present invention for 1/
The comparison diagram of 1 test data
Fig. 3 is to use the radial peak overpressure of cylinder explosive one end detonation and draw ratio determined by the method for the present invention for 4/
The comparison diagram of 1 test data
Fig. 4 is using cylinder explosive one end detonation axial proximal peak overpressure and draw ratio determined by the method for the present invention
For the comparison diagram of 1/1 test data
Fig. 5 is using cylinder explosive one end detonation axial proximal peak overpressure and draw ratio determined by the method for the present invention
For the comparison diagram of 4/1 test data
Fig. 6 is using cylinder explosive one end detonation axial distal end peak overpressure and draw ratio determined by the method for the present invention
For the comparison diagram of 1/1 test data
Fig. 7 is using cylinder explosive one end detonation axial distal end peak overpressure and draw ratio determined by the method for the present invention
For the comparison diagram of 4/1 test data
Fig. 8 is to use the radial peak overpressure of cylinder explosive center detonation and draw ratio determined by the method for the present invention for 1/
The comparison diagram of 1 to 4/1 analogue data
Fig. 9 is to use the axial peak overpressure of cylinder explosive center detonation and draw ratio determined by the method for the present invention for 1/
The comparison diagram of 1 to 4/1 analogue data
Test data bibliography includes：
1、Plooster M.N.:Blast effects from cylindrical explosive charges:
Experimental measurements.Report NWC TP 6382.Naval Report Centre,China Lake,
California 93555.1982.
2、Knock C,Davies N,Reeves T.Predicting Blast Waves from the Axial
Direction of a Cylindrical Charge[J].Propellants Explosives Pyrotechnics,
2015,40(2):169-179.
3、Knock C,Davies N.Predicting the Impulse from the Curved Surface of
Detonating Cylindrical Charges[J].Propellants Explosives Pyrotechnics,2011,36
(2):105-109.
4、Knock C,Davies N.Blast waves from cylindrical charges[J].Shock
Waves,2013, 23(4):337-343.
Existing peak overpressure determines that the radial prediction that method detonates for one end is relatively ripe, but for axis
To peak overpressure prediction do not account for the influence of draw ratio, a part of reason may be since test data discreteness is big, no
It is mixed in together with the corresponding data of draw ratio, it is difficult to observe the rule of draw ratio influence and propose accurate predictor formula.
Can be seen that from Fig. 2 to Fig. 7 using determined by the method for the present invention cylinder explosive one end detonate axial proximal, distal end, with
And radial peak overpressure is sufficiently close to existing test data, in addition to the cylinder explosive axial distal end that draw ratio is 1/1 in Fig. 6
It tests peak overpressure and is more than formula calculated value, possible reason has that experimental enviroment is complicated and changeable, explosive property is unstable, sensor
Precision difference, data processing human error etc., axis when illustrating the method for the present invention for determining the variation of cylinder explosive draw ratio
To peak overpressure be accurately and reliably.
The present invention is applicable not only to the cylinder explosive of one end detonation, and the cylinder for being also applied for center detonation is fried
Medicine.Due to the perfect test data for not having cylinder explosive center to detonate in open source literature, using occupying international military industry
The numerical simulation software AUTODYN in 80% or more market is simulated, and is verified using one end detonation test data, is obtained
Reliable numerical model, the test data for calculating center detonation propose new prediction accordingly for analyzing superpressure changing rule
Formula.From Fig. 8 and Fig. 9 as can be seen that using detonation different draw ratios in cylinder explosive center determined by the method for the present invention
Axial-radial peak overpressure be sufficiently close to analog result, illustrate the present invention determination method it is accurate and reliable.
Claims (3)
1. a kind of cylinder explosive axial-radial shock wave overpressure peak determines method, which is characterized in that include the following steps：
(10) initial parameter obtains：Obtain the initial parameter of cylinder explosive, including appearance and size, quality, explosive type, superpressure
Calculate distance；
(20) intermediate parameters calculate：According to initial parameter, the intermediate parameters of cylinder explosive, including equivalent TNT matter is calculated
Amount, ratio are quick-fried away from, draw ratio；
(30) peak overpressure determines：According to intermediate parameters and peak overpressure fitting formula, be calculated cylinder explosive it is axial and
Radial impact wave peak overpressure.
2. peak overpressure according to claim 1 determines method, which is characterized in that (30) peak overpressure determines step
Including：
(31) radial peak overpressure calculates：The radial impact wave that the detonation of cylinder explosive center and one end detonation is calculated as follows is super
Voltage crest value, unit kpa,
(32) detonation axial peak overpressure in center calculates：The axial impact wave superpressure of center detonation cylinder explosive is calculated as follows
Peak value, unit kpa,
(33) detonation axial distal end peak overpressure in one end calculates：One end is calculated as follows and detonates cylinder explosive axially away from detonation
The peak overpressure of point one end：
PAxis, one end=1.4PAxis, center,
(34) detonation axial proximal peak overpressure in one end calculates：One end is calculated as follows and detonates cylinder explosive axially adjacent to detonation
The peak overpressure of point one end：
PAxis, one end=0.5PAxis, center,
In above-mentioned formula, Z be ratio it is quick-fried away from, in draw ratio L/D, L is the height of cylinder, and D is cylinder bottom surface diameter of a circle, a,
B is mediant, and e is scientific notation symbol, P0It is atmospheric pressure.
3. peak overpressure according to claim 2 determines method, which is characterized in that described ((20) intermediate parameters calculate step
Suddenly include：
(21) equivalent TNT Mass Calculations：According to the corresponding TNT equivalent coefficients k of explosive type, equivalent TNT mass is calculated as follows
W,
W=k × m,
In formula, m is the quality of cylinder explosive, unit kg；
(22) ratio is quick-fried away from calculating：It is quick-fried away from Z that ratio is calculated as follows,
In formula, R is distance of the pressure measurement point apart from explosive geometric center, and unit is rice.
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Cited By (1)
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| CN109975142A (en) * | 2019-04-30 | 2019-07-05 | 公安部第一研究所 | A kind of non-contact explosion wave superpressure test macro of plate product and method |
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