CN112483479A - Static oscillating jet injection supercharging device - Google Patents
Static oscillating jet injection supercharging device Download PDFInfo
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- CN112483479A CN112483479A CN202011304432.3A CN202011304432A CN112483479A CN 112483479 A CN112483479 A CN 112483479A CN 202011304432 A CN202011304432 A CN 202011304432A CN 112483479 A CN112483479 A CN 112483479A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
- F04F5/46—Arrangements of nozzles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B3/00—Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
The invention discloses a static oscillating jet injection supercharging device, and belongs to the technical field of jet supercharging application of various fluids and pressure gases. The method comprises the following steps: the jet nozzle comprises a nozzle section, a jet flow oscillation section, an injection flow channel and a mixing cavity; the nozzle section is used for accelerating the fluid entering the injection supercharging device and then injecting the fluid into the jet flow oscillation section; the accelerated fluid is randomly deflected to an oscillation tube at one side in a jet oscillation section according to the coanda effect of the fluid to form a periodic self-sustaining polarized jet; the self-sustaining polarized jet flow freely expands in the oscillation tube to compress the injection fluid introduced from the injection flow channel and generate unsteady shock waves, so that the pressurization process is completed; the unsteady shock wave propagates along the oscillation pipe and flows into the deceleration diffusion flow passage through the outlet of the oscillation pipe and flows out of the ejector outlet of the mixing cavity. According to the static injection device, the abnormal injection and compression pressurization process is carried out through the oscillating jet flow, the problem of low isentropic efficiency of the traditional steady injection is solved, and the economic benefit of the static injection device is further improved.
Description
Technical Field
The invention belongs to the technical field of jet pressurizing application of various fluids and pressure gases, and particularly relates to a static oscillating jet injection pressurizing device.
Background
The comprehensive utilization of the gas pressure energy has important economic and social benefits. The static type injection supercharger has the advantages of simple structure, no rotating part, good two-phase flow adaptability and the like, and is widely applied to the fields of natural gas exploitation, high-pressure coal bed gas depressurization, low-pressure gas pressurization gathering and transportation, waste heat energy comprehensive utilization and the like. However, compared with an expander-compressor unit and a turbocharger, the traditional static type injection supercharger has lower isentropic efficiency, and the injection supercharging efficiency of the static type injection supercharger is urgently needed to be further improved.
Studies have shown that the efficiency of the unsteady processes is often higher than that of the steady processes. Typical examples include an axial-flow jet flow gas wave supercharger (CN201220115597.0), a radial-flow jet flow gas wave supercharger (CN201210081102.1), and the like, high-pressure gas is periodically connected to an oscillation pipe to generate shock waves to supercharge low-pressure gas, so that high compression efficiency can be realized. However, the devices belong to mobile equipment, and have the disadvantages of complex structure, insufficient fluctuation capacity under working conditions and limited use. Therefore, it is necessary to develop an ejector supercharger which has the advantages of the conventional static ejector supercharger and has high isentropic efficiency.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a static oscillating jet injection supercharging device, so that the technical problem of low isentropic efficiency of the traditional steady-state injection is solved.
In order to achieve the above object, according to one aspect of the present invention, a static oscillating jet injection supercharging device is provided, which includes a nozzle section, a jet oscillating section, an injection flow channel and a mixing chamber;
the nozzle section, the jet flow oscillation section and the mixing cavity are sequentially connected in the fluid flowing direction;
a splitter is arranged between the jet flow oscillation section and the mixing cavity, the outer surface of the front part of the splitter divides the rear end of the jet flow oscillation section into two to form two oscillation pipes, and the outer surface of the rear part of the splitter divides the front end of the mixing cavity into two to form two deceleration diffusion flow passages;
the oscillating pipe positioned on the same side is communicated with the speed reduction diffusion flow passage, and an oscillating pipe outlet is arranged between the oscillating pipe and the speed reduction diffusion flow passage;
the injection flow passage is symmetrically arranged at the two ends of the jet flow oscillating section along the central axis of the jet flow oscillating section, one end of the injection flow passage is provided with an injection flow passage inlet, and the other end of the injection flow passage is communicated with the oscillating pipe;
the nozzle section is used for accelerating the fluid entering the injection supercharging device and then injecting the fluid into the jet flow oscillation section; the accelerated fluid is randomly deflected to an oscillating tube at one side in the jet oscillation section according to the coanda effect of the fluid to form a periodic self-sustaining polarized jet;
the self-sustaining polarized jet flow freely expands in the oscillating tube to compress the injection fluid introduced from the injection flow channel and generate unsteady shock waves, and the unsteady shock waves are transmitted along the oscillating tube and flow into the deceleration diffusion flow channel through the outlet of the oscillating tube;
the deceleration diffusion flow passage is used for enabling the unsteady shock waves to flow into the mixing cavity after being decelerated and depressurized and to flow out of an ejector outlet of the mixing cavity.
Preferably, the nozzle segment comprises a nozzle tapered cavity and a flow deflector block;
one end of the nozzle reducing cavity is provided with an ejector inlet, and the other end of the nozzle reducing cavity is communicated with the jet flow oscillating section;
the flow guide block is positioned in the nozzle tapered cavity and can horizontally slide along the direction of the central axis of the nozzle tapered cavity to adjust the area of the ejector inlet.
Preferably, the flow guide block is a rhombic flow guide block.
Preferably, the fluidic oscillation section comprises an oscillation cavity and a feedback channel;
the feedback channels are symmetrically arranged along the central axis of the cavity of the oscillation cavity and are positioned at the front end of the injection flow channel;
the feedback channel is a U-shaped irregular channel and is provided with a feedback channel inlet and a feedback channel outlet, and the feedback channel outlet is arranged at the front end of the feedback channel inlet;
the outlet of the feedback channel is perpendicular to the flowing direction of the fluid in the oscillation cavity.
Preferably, the aperture of the feedback channel inlet is larger than the aperture of the feedback channel outlet.
Preferably, the feedback channel inlet is provided with a boss for facilitating the flow of fluid within the oscillator tube into the feedback channel.
Preferably, the section of the splitter is rhombic, and the sections of the front part and the rear part of the splitter are isosceles triangles;
the vertex angle of the isosceles triangle at the front section of the splitter ranges from 10 degrees to 30 degrees.
Preferably, the opening angle of the deceleration diffusion flow channel ranges from 10 degrees to 30 degrees.
Preferably, the top of the front portion of the splitter is located at the rear side of the outlet of the feedback channel.
Preferably, the included angle between the injection flow channel and the flow direction of the fluid in the oscillating tube is an obtuse angle.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
1. according to the static injection device, the abnormal injection and compression pressurization process is carried out through the oscillating jet flow, the problem of low isentropic efficiency of the traditional steady injection is solved, and the economic benefit of the static injection device is further improved;
2. the invention changes the area ratio of the jet flow by the movable flow guide block, can generate stable oscillation jet flow, and has strong working condition fluctuation resistance;
3. the invention improves the injection isentropic efficiency of the injection device, and has the advantages of simple structure, no movable part, strong two-phase flow resistance and the like.
Drawings
FIG. 1 is a schematic structural diagram of a static oscillating jet injection supercharging device according to the present invention;
FIG. 2 is a schematic diagram of the flow path of a fluid in the fluidic oscillation section of the present invention;
FIG. 3 is a schematic diagram of the flow path of the fluid in the fluidic oscillation section of the present invention;
FIG. 4 is a schematic view of the fluid flow within the oscillator tube of the present invention.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein: a nozzle convergent chamber 1; an oscillation cavity 2; a feedback channel outlet 3; a feedback channel inlet 4; an injection flow channel inlet 5; an oscillation tube outlet 6; a mixing chamber 7; an ejector outlet 8; a deceleration diffusion flow passage 9; a splitter 10; an oscillation tube 11; an injection flow passage 12; an attached wall surface 13; a feedback channel 14; a flow guide block 15; an eductor inlet 16; injection of low pressure zone 17; a contact surface 18; is pressurized by the pressurizer 19; a non-stationary shock wave 20.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention; in addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified. The terms first, second, third and the like in the description and in the claims of the present invention are used for distinguishing between different objects and not necessarily for describing a particular sequential order.
Fig. 1 is a schematic structural diagram of the static oscillating jet injection supercharging device of the invention. As shown in figure 1, the invention provides a static oscillating jet injection supercharging device which comprises a nozzle section, a jet oscillating section, an injection flow channel 12 and a mixing cavity 7.
As shown in fig. 1, the nozzle segment includes a nozzle tapering cavity 1 and a flow guide block 15, the front end of the nozzle tapering cavity 1 is provided with the ejector inlet 16, fluid flows into the ejector supercharging device from the ejector inlet 16, and the rear end of the nozzle tapering cavity 1 is communicated with the jet oscillation segment.
Specifically, the nozzle convergent cavity 1 is a structure in which the diameter of a front end cavity is large and the diameter of a rear end cavity is gradually reduced, so that the inflowing fluid can be accelerated at the rear end of the nozzle convergent cavity. The inside of the nozzle reducing cavity 1 is provided with the flow guide block 15, and the flow guide block can horizontally slide along the central axis direction of the nozzle reducing cavity 1.
Preferably, the flow guide block 15 is a rhombic flow guide block, the outer surface of the flow guide block 15 and the nozzle tapered cavity 1 form a tapered-diverging acceleration flow channel, the area ratio of the flow channel can be conveniently adjusted through the horizontal sliding of the flow guide block 15, and stable jet flow can be generated under the condition of certain fluctuation of working conditions.
In further detail, as shown in fig. 1, the jet oscillation section includes an oscillation cavity 2, a feedback channel 14, and an injection flow channel 12. The front end of the oscillation cavity 2 is communicated with the nozzle reducing cavity 1, and the rear end of the oscillation cavity 2 is communicated with the mixing cavity 7.
The connecting part of the oscillating cavity 2 and the mixing cavity 7 is provided with the splitter 10. Preferably, the section of each splitter 10 is in a diamond shape, the sections of the front and the rear of each splitter are in isosceles triangles, the outer surface of the splitter at the front and the wall surface 13 of the oscillation cavity 2 form the oscillation tube flow channel 11 together, and the outer surface of the splitter at the rear and the inner wall surface of the mixing cavity form the deceleration diffusion flow channel 9 together.
Preferably, the vertex angle of the isosceles triangle at the front part of the splitter is an acute angle, and the included angle ranges from 10 degrees to 30 degrees.
As shown in fig. 1, the feedback channel 14 and the injection flow channel 12 are both symmetrically arranged along the central axis of the oscillation cavity 2, and the feedback channel 14 is located at the front end of the injection flow channel 12.
The feedback channel 14 is a U-shaped channel, two ports of the U-shaped channel are the feedback channel inlet 4 and the feedback channel outlet 3, respectively, and the feedback channel outlet 3 is located at the front end of the feedback channel inlet 4.
Preferably, the U-shaped channel is an irregular cavity, and the deflection frequency of jet oscillation can be adjusted by utilizing the resonance frequency of the cavity. The aperture of the feedback channel inlet 4 is larger than the aperture of the feedback channel outlet 3, and in the path from the feedback channel inlet 4 to the feedback channel outlet 3, the diameter of the channel is reduced at the central axis of the feedback channel 14.
To be further described, the flow path direction of the feedback channel outlet 3 is perpendicular to the flow direction of the fluid in the oscillation cavity 2, so that the control of the feedback fluid on the main jet flow is facilitated. The end part of the front part of the splitter 10 is positioned on the right side of the outlet 3 of the feedback channel, and the control of the feedback fluid on the main jet flow is also facilitated.
A tiny boss is arranged on the right side of the feedback channel inlet 4, and the boss enables the fluid in the oscillating tube 11 to conveniently flow into the feedback channel 14 to form feedback flow.
One end of the injection flow passage 12 is provided with an injection flow passage inlet 5, and the other end is communicated with the oscillation pipe 11. The injection flow passage 12 can be communicated with the oscillation pipe 11 at a certain included angle, so that the injection flow passage can conveniently inject fluid to be introduced into the oscillation pipe 11.
As shown in fig. 1, the outer surface of the rear part of the splitter 10 and the inner wall surface of the mixing chamber jointly form the deceleration diffusion flow channel 9, the deceleration diffusion flow channel 9 is communicated with the mixing chamber 7, and the rear end of the mixing chamber 7 is provided with an ejector outlet 8.
Preferably, the opening angle of the deceleration diffusion flow channel ranges from 10 degrees to 30 degrees, so that the wall separation effect is reduced while the fluid is decelerated and diffused.
The invention utilizes the wall attachment effect of the high-speed fluid jet to generate periodic self-sustaining polarized jet in the oscillation cavity, and forms intermittent jet at the inlet of the oscillation tube at the downstream of the oscillation cavity, so that unsteady shock waves are generated in the oscillation tube, ejection low pressure is generated in a free expansion area of the jet, the ejection low pressure area is utilized to eject pressurized fluid, the unsteady shock waves generated in the next period are utilized to compress the pressurized fluid, and the ejection pressurization process with higher isentropic compression efficiency is completed.
Fig. 2 and 3 are schematic diagrams of the flow path of the fluid in the jet oscillation section, as shown in fig. 2 and 3, the direction of the arrow represents the direction of the fluid flow, and the work flow of the whole injection supercharging device is explained as follows:
the movable rhombic flow guide block 15 slides to a proper position according to working conditions to form a proper nozzle airflow acceleration area ratio, fluid enters the injection supercharging device through the injector inlet 16, the fluid is divided into two parts through the movable rhombic flow guide block 15 to accelerate the rear end of the nozzle tapered cavity 1, and finally the fluid is jetted into the oscillation cavity 2. Under the flow split by the isosceles triangular surface at the front part of the splitter 10, the flow is randomly deflected to one side according to the coanda effect (coanda effect) of the fluid and is attached to one of the two side coanda surfaces 13, most of the fluid jet flows into the oscillation pipe 11, and a small part of the fluid jet flows into the feedback channel 14 through the feedback channel inlet 4. As shown in fig. 2, the feedback fluid finally enters the oscillation cavity 2 through the feedback channel outlet 3, and pushes the deflected jet to the other side, so as to complete the process of oscillating the jet once, and then the process is repeated. As shown in fig. 3, the deflected jet with a certain frequency is generated in cycles.
The jet flow entering the oscillating pipe 11 can expand freely in the oscillating pipe 11 to compress the injection fluid entering the oscillating pipe 11 through the injection flow passage inlet 5 and the injection flow passage 12 in the previous period, a contact surface 18 can be formed between the injection flow passage inlet 5 and the injection flow passage 12, and an unsteady shock wave 20 can be generated and can be transmitted backwards along the oscillating pipe 11, as shown in fig. 4. After the jet flow entering the oscillating pipe 11 freely expands, the pressure is reduced to form an ejection low-pressure area 17, the pressure of the fluid in the area swept by the unsteady shock wave 20 is increased to form a pressurized area 19, when the unsteady shock wave 20 passes through the outlet 6 of the oscillating pipe, the pressurized fluid in the oscillating pipe 11 begins to be discharged from the oscillating pipe 11 to enter the deceleration diffusion flow channel 9 for kinetic energy and pressure energy conversion, and meanwhile, when the pressure of the ejection low-pressure area 17 is lower than the pressure of the ejection flow channel inlet 5, the ejection fluid begins to enter the oscillating pipe 11 through the ejection flow channel 12 to wait for the compression and pressurization of the deflected jet flow in the next period.
The kinetic energy of the fluid in the speed-reducing diffusion channel 9 is reduced to a reasonable level, the fluid enters the mixing cavity 7 and finally flows out of the injection supercharging device through the ejector outlet 8, and the whole process of the oscillating jet injection supercharging is completed.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A static oscillating jet injection supercharging device is characterized by comprising a nozzle section, a jet oscillation section, an injection flow channel (12) and a mixing cavity (7);
the nozzle section, the jet flow oscillation section and the mixing cavity (7) are sequentially connected in the fluid flowing direction;
a splitter (10) is arranged between the jet flow oscillating section and the mixing cavity (7), the outer surface of the front part of the splitter (10) divides the rear end of the jet flow oscillating section into two to form two oscillating pipes (11), and the outer surface of the rear part of the splitter (10) divides the front end of the mixing cavity (7) into two to form two deceleration diffusion flow passages (9);
the oscillating pipe (11) positioned on the same side is communicated with the speed reduction and pressure expansion flow passage (9);
the injection flow passage (12) is symmetrically arranged at two ends of the jet flow oscillating section along the central axis of the jet flow oscillating section, one end of the injection flow passage (12) is provided with an injection flow passage inlet (5), and the other end of the injection flow passage is communicated with the oscillating pipe (11);
the nozzle section is used for accelerating the fluid and randomly deflecting the fluid to an oscillation pipe (11) at one side in the jet oscillation section according to the coanda effect of the fluid to form periodic self-sustaining polarized jet;
the self-sustaining polarized jet flow freely expands in the oscillating pipe (11) to further compress the injection fluid introduced from the injection flow channel (12) and generate unsteady shock waves (20), and the unsteady shock waves (20) are transmitted along the oscillating pipe (11) and flow into the deceleration diffusion flow channel (9) through the oscillating pipe outlet (6);
the deceleration diffusion flow passage (9) is used for enabling the unsteady shock waves (20) to flow into the mixing cavity (7) after being decelerated and depressurized and then flow out of an ejector outlet (8) of the mixing cavity (7).
2. The stationary oscillating jet ejector plenum of claim 1, wherein the nozzle segment includes a nozzle convergent cavity (1) and a deflector block (15);
one end of the nozzle reducing cavity (1) is provided with an ejector inlet (16), and the other end of the nozzle reducing cavity is communicated with the jet flow oscillating section;
the flow guide block (15) is positioned in the nozzle tapered cavity (1) and can horizontally slide along the direction of the central axis of the nozzle tapered cavity to adjust the area of the ejector inlet (16).
3. The static oscillating jet injection supercharging device according to claim 2, characterized in that the guide block (15) is a rhombic guide block.
4. The static oscillating jet supercharging device according to any of claims 1 or 3, characterized in that the jet oscillation section comprises an oscillation chamber (2) and a feedback channel (14);
the feedback channels (14) are symmetrically arranged along the central axis of the cavity of the oscillation cavity (2), and the feedback channels (14) are positioned at the front end of the injection flow channel (12);
the feedback channel (14) is a U-shaped irregular channel, the feedback channel (14) is provided with a feedback channel inlet (4) and a feedback channel outlet (3), and the feedback channel outlet (3) is arranged at the front end of the feedback channel inlet (4);
the outlet (3) of the feedback channel is vertical to the flowing direction of the fluid in the oscillation cavity (2).
5. The stationary oscillating jet ejector supercharging device according to claim 4, characterized in that the aperture of the feedback channel inlet (4) is larger than the aperture of the feedback channel outlet (3).
6. A stationary oscillating jet ejector pressurisation device according to claim 5, characterised in that the feedback channel inlet (4) is provided with a boss for facilitating the flow of fluid in the oscillating tube (11) into the feedback channel (14).
7. The static oscillating jet injection supercharging device according to any one of claims 1 to 6, characterized in that the cross section of the splitter (10) is in a diamond shape, and the front cross section and the rear cross section of the splitter are both isosceles triangles;
the vertex angle of the isosceles triangle of the front section of the splitter (10) ranges from 10 degrees to 30 degrees.
8. The static oscillating jet injection supercharging device according to claim 7, wherein the opening angle of the deceleration diffusion flow channel (9) ranges from 10 ° to 30 °.
9. The stationary oscillating jet ejector supercharging device according to claim 8, wherein the top of the front part of the splitter (10) is located behind the outlet (3) of the feedback channel.
10. The static oscillating jet injection supercharging device according to claim 1, wherein an included angle between the injection flow passage (12) and a fluid flow direction in the oscillating pipe (11) is an obtuse angle.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114136583A (en) * | 2021-11-29 | 2022-03-04 | 中国人民解放军国防科技大学 | Zero-energy-consumption oscillating jet actuator for high-speed flow field control |
| CN114353306A (en) * | 2022-01-20 | 2022-04-15 | 上海理工大学 | Dynamic air supply device of fluid oscillator |
| CN115467715A (en) * | 2022-10-09 | 2022-12-13 | 上海交通大学 | Engine blade thermal fatigue eliminating device |
| CN116037337A (en) * | 2022-12-03 | 2023-05-02 | 中南大学 | Jet oscillation element and oscillation jet type pressure pulse generating device |
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