CN114280214A - Solid propellant combustion surface maintaining device and using method - Google Patents
Solid propellant combustion surface maintaining device and using method Download PDFInfo
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- CN114280214A CN114280214A CN202111464481.8A CN202111464481A CN114280214A CN 114280214 A CN114280214 A CN 114280214A CN 202111464481 A CN202111464481 A CN 202111464481A CN 114280214 A CN114280214 A CN 114280214A
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Abstract
The invention discloses a solid propellant combustion surface maintaining device and a using method thereof, wherein the solid propellant combustion surface maintaining device comprises a sample table, a horizontal displacement adjusting mechanism, a vertical displacement adjusting mechanism, a supporting seat, a sample table connecting piece and an ignition device; the horizontal displacement adjusting mechanism comprises a horizontal guide rail and a horizontal guide rail limiter, a first guide groove is formed in the supporting seat, and the horizontal guide rail can move back and forth along the direction of the first guide groove; the vertical displacement adjusting mechanism comprises a vertical bracket, a vertical guide rail, a sliding block, a power system and a synchronous belt transmission mechanism; the sample platform is connected with the sliding block through a sample platform connecting piece, a sample placing groove is arranged on the sample platform, the size of the sample placing groove is adjustable, and the ignition device is arranged near the sample placing groove. The solid propellant combustion surface maintaining device is compact in structural design, and the whole volume of the device is small; the method can compensate the moving of the combustion surface of the solid propellant in real time, maintain the stability of the combustion surface of the solid propellant and ensure the smooth detection of a specific position.
Description
Technical Field
The invention belongs to the technical field of solid fuel propellant combustion surface component detection, and particularly relates to a solid propellant combustion surface maintaining device and a using method thereof.
Background
In-situ real-time detection of the combustion surface components of the solid propellant is a key technology for understanding the combustion mechanism of the solid propellant. Most of the current detection means for the combustion components of the solid propellant adopt means such as decomposition process heat detection, combustion final product analysis, combustion surface structure characterization and the like. At present, a real-time online characterization means for a solid propellant combustion process is relatively deficient, and the main reason is that the solid propellant is different from a general liquid fuel characterization, in the combustion process, a combustion surface gradually moves back along with the combustion of the solid propellant, and the position of a combustion area of the solid propellant is always changed. The current common method is to use a planar light detection method (PLIF for example, Combustion and flame, 2012,159 (1)), 427-427 to perform parallel detection on a plane to counteract the effect of the solid propellant Combustion surface moving. However, this detection method is generally expensive and not suitable for large-scale popularization. A direct-push type solid propellant combustion surface maintaining device (application number 201910105833.7) is designed at northwest industrial university and the like, a piston drives a connecting rod to maintain the moving speed of a solid propellant, but the device has the defects of large size, narrow application range and the like, and meanwhile, the direct-push type drive has the potential risk of instrument damage caused by the failure of a limiting device. At present, how to counteract the invariance and error brought by the combustion surface movement to the detection accuracy in the solid propellant combustion process is still a difficult problem in the development of solid propellant combustion diagnosis.
Disclosure of Invention
In order to solve the technical problems, the invention provides a solid propellant combustion surface maintaining device and a using method thereof, wherein the solid propellant combustion surface moving speed is adjusted according to the difference of the solid propellant combustion speed, and the relative stability of the combustion surface position in the solid propellant combustion process is maintained.
The invention is realized by adopting the following technical scheme:
the invention discloses a solid propellant burning surface maintaining device which comprises a sample table, a horizontal displacement adjusting mechanism for adjusting the horizontal position of the sample table, a vertical displacement adjusting mechanism for adjusting the vertical position of the sample table, a supporting seat, a sample table connecting piece and an ignition device, wherein the sample table is provided with a horizontal displacement adjusting mechanism;
the horizontal displacement adjusting mechanism comprises a horizontal guide rail and a horizontal guide rail limiter, a first guide groove is formed in the supporting seat, and the horizontal guide rail can move back and forth along the direction of the first guide groove; the horizontal guide rail limiter is used for fixing the position of the horizontal guide rail on the supporting seat;
the vertical displacement adjusting mechanism comprises a vertical bracket, a vertical guide rail, a sliding block, a power system and a synchronous belt transmission mechanism; the vertical guide rail is connected to the vertical support, the vertical support and the power system are connected to the horizontal guide rail, two ends of the synchronous belt transmission mechanism are respectively connected to the output end of the power system and the vertical support, and a transmission belt of the synchronous belt transmission mechanism moves in the vertical direction; the sliding block is provided with a second guide groove matched with the vertical guide rail, the sliding block is connected with a transmission belt, and the transmission belt moves to drive the sliding block to move up and down along the vertical guide rail;
the sample platform is connected with the sliding block through the sample platform connecting piece, a sample placing groove is formed in the sample platform, the size of the sample placing groove is adjustable, and the ignition device is arranged near the sample placing groove.
Preferably, the horizontal guide rail stopper is of an annular sleeve structure, the horizontal guide rail is installed in the annular sleeve after being matched with the supporting seat, the annular sleeve is fixed with the horizontal guide rail, a hole for inserting a limit screw is formed in the side wall of the annular sleeve, and the relative position of the annular sleeve and the supporting seat is fixed through the limit screw.
Preferably, the sliding block is connected with the transmission band through a limiting buckle, the limiting buckle comprises an L-shaped plate and a first connecting plate, one end of the L-shaped plate is connected with the sliding block, the other end of the L-shaped plate is connected with the first connecting plate through a bolt, and the transmission band is clamped between the L-shaped plate and the first connecting plate.
Preferably, the vertical support comprises a vertical plate, a cantilever and a second connecting plate, the bottom of the vertical plate is connected with the horizontal guide rail, the cantilever is connected to the top of the vertical plate, the second connecting plate is connected to the tail end of the cantilever, and a driven wheel of a synchronous belt transmission mechanism is connected to the second connecting plate; the vertical guide rail is connected to the vertical plate.
Preferably, the second guide groove is a dovetail groove.
Preferably, the sample stage comprises an adjusting plate, a fixing plate, a guide rod and a spring; a semi-annular cavity with one side opened is arranged on the adjusting plate; the fixed plate is connected to the sample table connecting piece, a guide hole and a bulge are formed in the fixed plate, one end of the guide rod is fixed to the adjusting plate, the other end of the guide rod is inserted into the guide hole, the guide rod drives the adjusting plate to axially move back and forth along the guide hole, the bulge is matched with the opening of the semi-annular cavity, and the outermost edge of the bulge and the semi-annular cavity surround to form the sample placing groove; two ends of the spring are respectively connected to the fixing plate and the adjusting plate.
Preferably, the vertical guide rail, the power system and the synchronous belt transmission mechanism are arranged on one side of the vertical support, and the sample stage is arranged on the other side of the vertical support; the sample platform connecting piece is a special-shaped plate which is bent for many times, one end of the special-shaped plate is connected with the sliding block, and the other end of the special-shaped plate is connected with the sample platform.
Preferably, the ignition device is a binding post arranged near the sample placing groove, the binding post is a copper post, and an insulating layer is arranged on a contact surface of the binding post and the sample table.
The invention also discloses a use method of the solid propellant combustion surface maintaining device, which comprises the following steps:
and 5, setting the moving speed of the sample stage, so that the moving speed of the sample stage is equal to the burning speed of the burning surface of the solid propellant grain.
Compared with the prior art, the invention has the beneficial effects that:
the solid propellant combustion surface maintaining device is compact in structural design, small in overall size, capable of achieving random adjustment in the horizontal direction and the vertical direction, and applicable to in-situ detection of various testing environments or scenes; the device can compensate the moving back of the combustion surface of the solid propellant in real time, maintain the stability of the combustion surface of the solid propellant and ensure the smooth detection of a specific position; the sample placing groove of the sample table of the device is adjustable in size and is suitable for solid propellants with different sizes.
Other advantages of the present invention are described in detail in the detailed description of the invention.
Drawings
Fig. 1 is a front left view of a solid propellant fuel sustaining device in accordance with an embodiment of the present invention.
Fig. 2 is a rear right view of a solid propellant fuel retaining device in accordance with an embodiment of the present invention.
Fig. 3 is a rear left view of a solid propellant fuel retaining device in accordance with an embodiment of the present invention.
Fig. 4 is a schematic view of a vertical displacement adjustment mechanism and a power system according to an embodiment of the present invention.
Fig. 5 is a schematic view illustrating a connection between a sample stage and a slide block according to an embodiment of the present invention.
Fig. 6 is a schematic view of a connecting member of a sample stage according to an embodiment of the present invention.
Fig. 7 is a partially enlarged view of a sample stage of the solid propellant fuel sustaining device according to an embodiment of the present invention.
The various reference numbers in the figures illustrate:
1-a sample stage, 2-a horizontal displacement adjusting mechanism, 3-a vertical displacement adjusting mechanism, 4-a supporting seat, 5-a sample stage connecting piece, 6-an ignition device and 7-an insulating layer;
11-adjusting plate, 12-fixing plate, 13-guide rod, 14-spring, 15-sample placing groove;
111-half ring cavity; 121-guide hole, 122-projection;
21-horizontal guide rail, 22-horizontal guide rail limiter;
31-a vertical support, 32-a vertical guide rail, 33-a sliding block, 34-a power system, 35-a synchronous belt transmission mechanism and 36-a limiting buckle;
311-vertical plate, 312-cantilever, 313-second connecting plate, 314-slot, 315-screw;
331-a second guide groove;
351-driving wheel, 352-driven wheel and 353-transmission belt;
361-L-shaped plate, 362-first connecting plate;
41-first guide groove.
Detailed Description
The following description of the present invention is provided for the purpose of illustration, and unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be construed broadly and may include, for example, a fixed connection or a detachable connection or an integral connection; either a direct connection or an indirect connection, and the like. The specific meaning of the above terms in the present technical solution can be understood by those of ordinary skill in the art according to specific situations.
In the present invention, unless otherwise specified, the terms of orientation such as "upper, lower, bottom, top" are generally defined with reference to the drawing plane of the corresponding drawing, "inner and outer" are defined with reference to the outline of the corresponding drawing, and "front and rear" are defined with reference to the gas flow direction.
The present invention is not limited to the following embodiments, and various specific technical features described in the following embodiments may be combined in any suitable manner without contradiction, as long as they do not depart from the idea of the present invention, and should be considered as the disclosure of the present invention.
The embodiment of the invention discloses a solid propellant combustion surface maintaining device, as shown in fig. 1 to 3, comprising: sample platform 1, horizontal displacement adjustment mechanism 2, vertical displacement adjustment mechanism 3, supporting seat 4, sample platform connecting piece 5 and ignition device 6.
The horizontal displacement adjusting mechanism 2 is used for adjusting the horizontal position of the sample table 1. The horizontal displacement adjusting mechanism 2 of the present embodiment includes a horizontal guide rail 21 and a horizontal guide rail stopper 22, a first guide groove 41 is provided on the support base 4, the horizontal guide rail 21 is installed in the first guide groove 41 in a matching manner, and the horizontal guide rail 21 can move back and forth along the direction of the first guide groove 41.
The horizontal guide rail stopper 22 is connected to the horizontal guide rail 21, and is used for fixing the position of the horizontal guide rail 21 on the support base 4. In the preferred embodiment, the horizontal rail stopper 22 is an annular sleeve structure, which can improve the moving smoothness of the horizontal rail 21. The structural shape of the annular sleeve is matched with the cross section shape of the horizontal guide rail 21 and the supporting seat 4 after assembly, the horizontal guide rail 21 and the supporting seat 4 are installed in the annular sleeve in a matched mode, and the annular sleeve is fixed with the horizontal guide rail 21 and is fixed through bolts or welded. The side wall of the annular sleeve is provided with a hole, and a limit screw can be inserted into the hole. After the horizontal guide rail 21 is moved to a proper position, the whole horizontal displacement adjusting mechanism 2 is fixed on the supporting seat 4 through a limit screw.
The horizontal guide rail 21 and the support seat 4 of this embodiment are both rectangular structures, and the two ends of the support seat 4 are provided with connecting parts for connecting with other fixed parts.
The vertical displacement adjusting mechanism 3 is used for adjusting the vertical position of the sample table 1. As shown in fig. 4, the vertical displacement adjustment mechanism 3 of the present embodiment includes a vertical bracket 31, a vertical guide rail 32, a slide block 33, a power system 34, and a timing belt transmission mechanism 35. Wherein, the power system 34 is a stepping motor, and the rotating speed can be adjusted to achieve the stepless speed change of 0-1000 r/min. The timing belt transmission mechanism 35 includes a driving pulley 351, a driven pulley 352, and a transmission belt 353. The vertical guide rail 32 is connected on the vertical support 31, the vertical support 31 and the power system 34 are both connected on the horizontal guide rail 21, the driving wheel 351 and the driven wheel 352 of the synchronous belt transmission mechanism 35 are respectively connected on the output end of the power system 34 and the vertical support 31, and the transmission belt 353 moves in the vertical direction.
Preferably, in this embodiment, as shown in fig. 3, the vertical support 31 includes a vertical plate 311, a cantilever 312 and a second connecting plate 313, the bottom of the vertical plate 311 is connected to the horizontal guide rail 21, the cantilever 312 is integrally connected to the top of the vertical plate 311, the second connecting plate 313 is detachably mounted at the end of the cantilever 312, specifically, an insertion slot 314 is disposed at the end of the cantilever 312, a bolt hole penetrates through a wall of the insertion slot 314, and the second connecting plate 313 is inserted into the insertion slot 314 and then fixed in the insertion slot 314 by a screw 315, which is convenient to disassemble and assemble. The driven wheel 352 of the timing belt transmission mechanism 35 is mounted on the second connecting plate 313, and the vertical guide rail 32 is connected to the vertical plate 311 by a bolt.
The sliding block 33 is provided with a second guide groove 331, the second guide groove 331 is in a dovetail groove shape, the second guide groove 331 is installed in cooperation with the vertical guide rail 32, in this embodiment, the surface roughness requirement Ra of the vertical guide rail 32 and the second guide groove 331 is less than 0.05, and the sliding block 33 can slide without resistance. The sliding block 33 is connected to the transmission belt 353, so that the transmission belt 353 moves to drive the sliding block 33 to move up and down along the vertical guide rail 33. Preferably, the sliding block 33 and the transmission belt 353 are connected through the limit buckle 36, and the limit buckle 36 can be detached. As shown in fig. 5, the limiting buckle 36 of the present embodiment includes an L-shaped plate 361 and a first connecting plate 362, one end of the L-shaped plate 361 is connected to the sliding block 33 by a bolt, the other end of the L-shaped plate 361 is connected to the first connecting plate 362 by a bolt, and the transmission belt 353 is sandwiched between the L-shaped plate 361 and the first connecting plate 362. The L-shaped plate 361 and the first connecting plate 362 are matched to play a role in connecting the transmission belt 353, and can be used as a counterweight to play a role in stabilizing the sample stage 1, so that unstable motion of the sample stage 1 in the moving process can be reduced.
In addition, the material of the transmission belt 353 is organic rubber, and the flexible connection mode is adopted, so that the damage to the device caused by potential instrument limiting failure is effectively avoided while power is stably output.
As shown in fig. 7, the sample stage 1 of the present embodiment includes an adjusting plate 11, a fixing plate 12, a guide bar 13, and a spring 14. The adjusting plate 11 is provided with a semi-annular cavity 111 with one open side, specifically a square cavity formed by sequentially connecting three vertical plates, and one open side of the square cavity. The fixing plate 12 is fixedly connected to the sample stage connecting piece 5 through a bolt. The fixing plate 12 is provided with a guide hole 121 and a protrusion 122, the protrusion 122 is provided on the side of the fixing plate 12, and the width of the protrusion 122 ensures that it can be inserted into the open mouth of the semi-annular cavity 111. Further, the fixing plate 12 of this embodiment is a T-shaped plate, two guiding holes 121 are symmetrically disposed at the flange of the T-shaped plate, and the protrusion 122 is formed at the web of the T-shaped plate. One end of the guide rod 13 is fixed on the adjusting plate 11 through a bolt, and the other end is inserted into the guide hole 121, so that the adjusting plate 11 is suspended on the fixing plate 12 through the guide rod 13, and the guide rod 13 drives the adjusting plate 11 to move back and forth along the axial direction of the guide hole 121. The projection 122 is fitted to the opening of the semi-annular cavity 111 of the adjustment plate 11 so that the projection 122 can be inserted into the semi-annular cavity 111, and the space formed by the outermost edge of the projection 122 and the semi-annular cavity 111 forms the sample placement groove 15. Two ends of the spring 14 are respectively connected to the fixing plate 12 and the adjusting plate 11, when a sample needs to be placed, the adjusting plate 11 is pulled to move in the direction away from the fixing plate 12, the spring 14 is stretched, the sample to be tested is placed into the sample placing groove 15, the adjusting plate 11 is loosened, and the spring 14 rebounds to clamp the sample to be tested. The sample placing groove 15 of the sample table is adjustable in size and applicable to samples of different sizes. And this sample platform structure is favorable to propellant sample's quick installation and dismantlement, has promoted work efficiency.
In order to miniaturize the whole device, the vertical guide rail 32, the power system 34 and the synchronous belt transmission mechanism 35 of the embodiment are arranged on one side of the vertical support 31, and the sample table 1 is arranged on the other side of the vertical support 31, so that the vertical displacement adjusting mechanism 3 and the sample table 1 are uniformly arranged above the horizontal guide rail 21. In order to match the arrangement positions of the above components, the sample stage connecting piece 5 of the embodiment is a special-shaped plate which is bent for many times, as shown in fig. 6, the special-shaped plate is formed by connecting two L-shaped plates end to end through a vertical plate, the two L-shaped plates and the vertical plate are integrally processed, bolt holes are processed in the two L-shaped plates, and the two L-shaped plates are respectively connected with the fixing plate 12 and the sliding block 33 of the sample stage 1 through bolts.
The whole device is small in size, has the characteristic of miniaturization, is wide in application range, can be suitable for in-situ detection of specific combustion areas and combustion surface characteristics of solid propellants in various scenes, and the whole size of the device is 180mm 50mm 70 mm.
As shown in fig. 7, the ignition device 6 of the present embodiment is a terminal provided in the vicinity of the sample-placing groove 15, and the terminals are symmetrically provided on both sides of the sample-placing groove 15. The wiring terminal is a red copper column, the wiring terminal is fixed on an adjusting plate 11 of the sample table 1, and ignition is realized by heating resistance wires on the wiring terminal through current. An insulating layer 7 is arranged on the contact surface of the adjusting plate 11 and the binding post, and the insulating layer 7 is made of polytetrafluoroethylene and has good insulating property.
In addition, the binding post can be connected with a control system through a cable, the ignition process of the solid propellant is controlled through the control system, and a power system is also connected with the control system through the cable to control the rotating speed of the motor, so that the moving speed of the sample table 1 is controlled.
The invention further discloses a use method of the solid propellant combustion surface maintaining device of the embodiment, which specifically comprises the following steps:
and 5, setting the moving speed of the sample table 1, namely the rotating speed of the motor, so that the moving speed of the sample table 1 is equal to the burning speed of the burning surface of the sample to be detected, ensuring that the burning surface of the sample to be detected moves and is compensated by the movement of the sample table 1 in real time in the retreating process, and further ensuring the stability of the burning surface of the sample to be detected so as to finish the stable detection of the specific flame zone.
Claims (9)
1. A solid propellant combustion surface maintaining device is characterized by comprising a sample table (1), a horizontal displacement adjusting mechanism (2) for adjusting the horizontal position of the sample table (1), a vertical displacement adjusting mechanism (3) for adjusting the vertical position of the sample table (1), a supporting seat (4), a sample table connecting piece (5) and an ignition device (6);
the horizontal displacement adjusting mechanism (2) comprises a horizontal guide rail (21) and a horizontal guide rail limiter (22), a first guide groove (41) is formed in the supporting seat (4), and the horizontal guide rail (21) can move back and forth along the direction of the first guide groove (41); the horizontal guide rail limiter (22) is connected with the horizontal guide rail (21), and the horizontal guide rail limiter (22) is used for fixing the position of the horizontal guide rail (21) on the supporting seat (4);
the vertical displacement adjusting mechanism (3) comprises a vertical support (31), a vertical guide rail (32), a sliding block (33), a power system (34) and a synchronous belt transmission mechanism (35); the vertical guide rail (32) is connected to the vertical support (31), the vertical support (31) and the power system (34) are both connected to the horizontal guide rail (21), two ends of the synchronous belt transmission mechanism (35) are respectively connected to the output end of the power system (34) and the vertical support (31), and the transmission belt (353) of the synchronous belt transmission mechanism (35) moves in the vertical direction; the sliding block (33) is provided with a second guide groove (331) matched with the vertical guide rail (32), the sliding block (33) is connected with a transmission belt (353), and the transmission belt (353) moves to drive the sliding block (33) to move up and down along the vertical guide rail (33);
the sample table (1) is connected with the sliding block (33) through the sample table connecting piece (5), a sample placing groove (15) is arranged on the sample table (1), the size of the sample placing groove (15) is adjustable, and the ignition device (6) is arranged near the sample placing groove (15).
2. The solid propellant combustion face maintaining device as claimed in claim 1, characterized in that the horizontal guide rail stopper (22) is of an annular sleeve structure, the horizontal guide rail (21) is installed in the annular sleeve after being matched with the supporting seat (4), the annular sleeve is fixed with the horizontal guide rail (21), a hole for inserting a limit screw is arranged on the side wall of the annular sleeve, and the relative position of the annular sleeve and the supporting seat (4) is fixed through the limit screw.
3. The solid propellant combustion surface maintaining device as claimed in claim 1, wherein the sliding block (33) is connected with the transmission belt (353) through a limit buckle (36), the limit buckle (36) comprises an L-shaped plate (361) and a first connecting plate (362), one end of the L-shaped plate (361) is connected with the sliding block (33), the other end of the L-shaped plate (361) is connected with the first connecting plate (362) through a bolt, and the transmission belt (353) is clamped between the L-shaped plate (361) and the first connecting plate (362).
4. The solid propellant combustion face maintaining device as claimed in claim 1, characterized in that the vertical bracket (31) comprises a vertical plate (311), a cantilever (312) and a second connecting plate (313), the bottom of the vertical plate (311) is connected with the horizontal guide rail (21), the cantilever (312) is connected to the top of the vertical plate (311), the second connecting plate (313) is connected to the tail end of the cantilever (312), and a driven wheel (352) of a synchronous belt transmission mechanism (35) is connected to the second connecting plate (313); the vertical guide rail (32) is connected to the vertical plate (311).
5. The solid propellant face maintenance device of claim 1, wherein the second channel (331) is a dovetail groove.
6. The solid propellant combustion face maintaining device of claim 1, characterized in that the sample stage (1) comprises an adjusting plate (11), a fixing plate (12), a guide rod (13) and a spring (14); a semi-annular cavity (111) with one side opened is arranged on the adjusting plate (11); the fixing plate (12) is connected to the sample stage connecting piece (5), a guide hole (121) and a protrusion (122) are formed in the fixing plate (12), one end of the guide rod (13) is fixed to the adjusting plate (11), the other end of the guide rod is inserted into the guide hole (121), the adjusting plate (11) is driven by the guide rod (13) to axially move back and forth along the guide hole (121), the protrusion (122) is matched with an opening of the semi-annular cavity (111), and the outermost edge of the protrusion (122) and the semi-annular cavity (111) surround to form the sample placing groove (15); two ends of the spring (14) are respectively connected to the fixing plate (12) and the adjusting plate (11).
7. The solid propellant combustion surface maintaining device as claimed in claim 1 or 6, wherein the vertical guide rail (32), the power system (34) and the synchronous belt transmission mechanism (35) are arranged on one side of a vertical bracket (31), and the sample stage (1) is arranged on the other side of the vertical bracket (31); the sample platform connecting piece (5) is a special-shaped plate which is bent for many times, one end of the special-shaped plate is connected with the sliding block, and the other end of the special-shaped plate is connected with the sample platform (1).
8. The solid propellant burnfront maintenance device of claim 1, wherein the ignition device (6) is a terminal disposed near the sample placement groove (15), the terminal is a copper column, and an insulating layer (7) is disposed on a contact surface of the terminal and the sample stage (1).
9. The use method of the solid propellant combustion surface maintaining device of any one of claims 1 to 8, characterized by comprising the following steps:
step 1, preparing a solid propellant grain, and ensuring that the upper and lower sections of the grain are flat;
step 2, testing burning rate data of the solid propellant grain under the test environment pressure;
step 3, fixing the whole solid propellant combustion surface maintaining device in a test environment through a support seat (4), adjusting the position of the sample table (1) in the horizontal direction through a horizontal guide rail (21), and fixing the position of the horizontal guide rail (21) through a horizontal guide rail limiting stopper (22);
step 4, fixing the solid propellant grain in a sample placing groove (15) of the sample table (1);
and 5, setting the moving speed of the sample table (1) so that the moving speed of the sample table (1) is equal to the burning speed of the burning surface of the solid propellant grain.
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