CN110030114B - Restrain high-efficient gas mixing structure of low frequency oscillation - Google Patents
Restrain high-efficient gas mixing structure of low frequency oscillation Download PDFInfo
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- CN110030114B CN110030114B CN201910223088.6A CN201910223088A CN110030114B CN 110030114 B CN110030114 B CN 110030114B CN 201910223088 A CN201910223088 A CN 201910223088A CN 110030114 B CN110030114 B CN 110030114B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/44—Feeding propellants
- F02K9/46—Feeding propellants using pumps
- F02K9/48—Feeding propellants using pumps driven by a gas turbine fed by propellant combustion gases or fed by vaporized propellants or other gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/60—Constructional parts; Details not otherwise provided for
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Abstract
A high-efficiency fuel gas mixing structure for inhibiting low-frequency oscillation is suitable for a pipeline system containing a gas-liquid mixing flowing state, and can eliminate an excitation source causing low-frequency pulsation of a liquid flow system, so that the aim of inhibiting the low-frequency oscillation of the liquid flow system is fulfilled. The gas mixing structure is an annular structure, and the annular part comprises two rows of circular through holes with equal diameters. The essence of the gas mixing structure is that the mixing holes are small round holes and are large in number, the hole center distance of the round holes and the round hole diameter meet a certain rule, continuous gas films are prevented from being formed after bubbles are separated, and a low-frequency pulsating excitation source of a liquid flow system is fundamentally eliminated. The gas mixing structure disclosed by the invention has been subjected to verification tests on products, so that a good effect is obtained, the low-frequency oscillation of a liquid flow system in a pipeline is effectively inhibited, the reliability of the product is improved, and the gas mixing structure can be popularized and applied in similar pipeline systems containing a gas-liquid mixing flowing state.
Description
Technical Field
The invention relates to a high-efficiency gas mixing structure for inhibiting low-frequency oscillation, and belongs to the field of fluid machinery.
Background
For a high-pressure afterburning liquid rocket engine, a precompression turbine pump is driven by high-temperature and high-pressure oxygen-enriched gas behind a main turbine, and the precompression turbine pump is one of effective modes for improving the efficiency of a propellant supply system. Under the drive of fuel gas, the precompression pump rotates at a high speed to pressurize main path liquid oxygen, and the precompression pump pre-pressurizes the propellant, so that the requirement of the turbine pump on the inlet pressure of the engine is reduced, and the working reliability of the engine and the carrying capacity of the engine are improved. After the high-temperature high-pressure oxygen-enriched gas drives the pre-compressed turbine to do work, the pre-compressed gas directly enters the low-temperature liquid oxygen area through the mixed flow hole, the high-temperature high-pressure oxygen-enriched gas and the mixed flow hole are quickly mixed and then condensed, a complex two-phase flow process occurs in the period, the liquid oxygen physical property parameters, the contact surface temperature, the pressure and the like are violently changed, and the low-frequency oscillation of an oxygen system is easily caused when an engine is examined under the boundary condition. The harmfulness is mainly shown in the following steps: (1) after superposition oscillation, the pressure of an oxygen inlet of the engine is easily too low, and the oxygen precompression pump and the oxygen pump are seriously cavitated, so that the engine cannot normally work; (2) after the flow path of the engine oxygen system oscillates, the structure is easy to lose efficacy due to low frequency; (3) the oscillation of the engine oxygen system is finally reflected on thrust pulsation, and is easy to generate dynamic coupling with the rocket overall structure, so that longitudinal unstable vibration is generated. The low frequency oscillation of the oxygen system directly restricts the working reliability of the engine to be improved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention provides a high-efficiency oxygen-enriched fuel gas mixing structure, which is used for overcoming the defects of the prior art and solving the problem of low-frequency oscillation caused by the conventional fuel gas mixing structure.
The technical solution of the invention is as follows:
a high-efficiency fuel gas mixing structure for inhibiting low-frequency oscillation is an annular thin-wall structure, wherein two layers of circular through holes with equal diameters are arranged on the side wall of the mixing structure, included angles between the central lines of all the circular through holes and the axial line of the annular thin-wall structure are the same, and the circular through holes in each layer are uniformly arranged along the circumferential direction;
the annular thin-wall structure is internally filled with liquid, the outer part of the annular thin-wall structure is filled with fuel gas, and the fuel gas enters the annular thin-wall structure through the circular through hole and is mixed with the liquid. The diameters of the upper end face and the lower end face of the annular thin-wall structure are different. The arrangement positions of the two rows of circular through holes with equal diameters on the side wall are the mixing positions of the fuel gas and the liquid. The number of the upper and lower layers of circular through holes is equal, and every two corresponding circular through holes are positioned on the axial surface of the same annular thin-wall structure.
Satisfy between two adjacent circular through-hole minimum hole heart distance in same layer and the circular aperture: l isminD is more than or equal to 2.5, wherein LminMin (L1, L2), wherein L1 is the hole center distance of two mixing holes corresponding to each other up and down, and each layer of L2 comprises two adjacent circular through holesD is the diameter of the mixing hole, and the mixing hole is a circular through hole. The included angles theta between the central lines of all the circular through holes and the axial lead of the annular thin-wall structure are equal, and the theta is 40 DEG<θ<80 degrees. The aperture d of all round through holes is equal, and is 4mm<d<12mm。
The liquid pressure range is 1-2 MPa, the gas pressure range is 2-3 MPa, the temperature range is 200-300K, and the gas can be dissolved in the liquid. The annular thin-wall structure is made of stainless steel.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the novel fuel gas mixing structure, the fuel gas mixing holes are two rows of small circular inclined holes, and the increase of the number of the mixing holes eliminates the excitation source of the low-frequency pulsation of the oxygen system;
(2) according to the novel fuel gas mixing structure designed by the invention, a certain rule is required to be satisfied between the hole center distance of adjacent circular holes and the circular hole diameter, so that a continuous gas film is prevented from being formed after bubbles are separated, and the fuel gas is in a large amount of single bubble state when oxygen-enriched fuel gas is mixed with liquid oxygen;
(3) the novel fuel gas mixing structure scheme provided by the invention is simple and effective, and is verified by practice.
Drawings
FIG. 1 is a front view of the gas blending structure of the present invention;
FIG. 2 is a view in the direction A of FIG. 1;
wherein the reference numerals are: 1-gas side surface, 2-liquid side surface, d-round hole aperture, theta-included angle between central line of mixing hole and axial line of ring structure, L1-hole center distance of two front and back corresponding mixing holes, and L2-hole center distance of each row of mixing holes.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, the present invention provides a high-efficiency gas mixing structure for suppressing low-frequency oscillation. The main structure is an annular thin-wall structure part, the diameters of the upper end surface and the lower end surface of the annular thin-wall structure are different, and the annular thin-wall structure is generally in a round table shape.
Two layers of circular through holes with the same diameter are arranged on the side wall, and the circular holes are mixing holes for communicating gas and liquid flow. The included angles between the central lines of all the circular through holes and the axial lead of the annular thin-wall structure are the same, and each layer of circular through holes are uniformly distributed along the circumferential direction; the annular thin-wall structure is internally filled with liquid, the outer part of the annular thin-wall structure is filled with fuel gas, and the fuel gas enters the annular thin-wall structure through the circular through hole and is mixed with the liquid. The arrangement positions of the two rows of circular through holes with equal diameters on the side wall are the mixing positions of the fuel gas and the liquid.
The number of the upper and lower layers of circular through holes is equal, and every two corresponding circular through holes are positioned on the axial surface of the same annular thin-wall structure. The mixing holes are equal in diameter, and the center lines of the through holes are straight lines. The included angles between the central lines of all the round holes and the axial line of the annular structure are the same. This ensures that each bubble exiting from the dilution holes is the same physical size.
From the viewpoint of inhibiting the low-frequency oscillation of the pipeline liquid flow, the diameter of the mixing holes is ensured to be not too small, and the increase of the number of the mixing holes eliminates an excitation source of the low-frequency oscillation of the pipeline liquid flow system; the diameter of the mixing holes is not small enough to reduce the flow resistance of the fuel gas flowing through the mixing holes. The diameter d of the mixing hole is generally 4mm < d <12 mm.
In order to prevent adjacent bubbles from forming a continuous air film after being separated, the minimum hole center distance between two adjacent circular holes and the circular hole diameter needs to satisfy the following conditions: l isminThe/d is more than or equal to 2.5. Minimum hole center distance LminTaking the smaller value of the distance between the centers of two corresponding mixing holes in the front and the back and the distance between the centers of each row of mixing holes, namely LminMin (L1, L2), wherein L1 is the hole center distance between two blending holes corresponding to each other up and down, and the hole center distance between two adjacent circular through holes of each layer of L2.
As shown in fig. 1 and 2, the included angle theta between the central line of all the mixing holes and the axial line of the annular structure is equal, and the included angle theta is generally 40 degrees < theta <80 degrees.
In the embodiment, the liquid pressure range is 1-2 MPa, liquid oxygen can be adopted for general liquid, the gas pressure range is 2-3 MPa, the temperature range is 200-300K, and the gas can be dissolved in the liquid and is gas oxygen. The annular thin-wall structure is made of stainless steel, so that the corrosion can be prevented.
In conclusion, the novel fuel gas mixing structure designed by the invention has the advantages that the increase of the number of mixing holes eliminates the excitation source of the low-frequency pulsation of the oxygen system; the law that satisfies between the hole heart distance of adjacent circular port and the circular aperture avoids the bubble to break away from and forms continuous air film later, and the gas is a large amount of single bubble states when guaranteeing oxygen boosting gas and liquid oxygen mixing.
While the foregoing description of the present example and the accompanying drawings represent the preferred embodiments of the present invention, those skilled in the art will appreciate that various modifications may be made in the design and parameters without departing from the scope of the invention as defined in the appended claims.
Claims (2)
1. The utility model provides a restrain high-efficient gas mixing structure of low frequency oscillation which characterized in that: the mixing structure is an annular thin-wall structure, two layers of circular through holes with equal diameters are arranged on the side wall, included angles between the central lines of all the circular through holes and the axial lead of the annular thin-wall structure are the same, and the circular through holes in each layer are uniformly arranged along the circumferential direction;
the liquid is arranged in the annular thin-wall structure, the fuel gas is arranged outside the annular thin-wall structure, and the fuel gas enters the annular thin-wall structure through the circular through hole and is mixed with the liquid;
the arrangement positions of the two rows of circular through holes with equal diameters on the side wall are the mixing positions of the fuel gas and the liquid
The upper layer and the lower layer of circular through holes are equal in number, and every two corresponding circular through holes are arranged on the axial surface of the same annular thin-wall structure;
satisfy between two adjacent circular through-hole minimum hole heart distance in same layer and the circular aperture:
Lmind is more than or equal to 2.5, wherein LminMin (L1, L2), wherein L1 is the distance between the centers of two mixing holes corresponding up and down, the distance between the centers of two adjacent circular through holes in each layer of L2, d is the diameter of the mixing hole, and the mixing hole is a circular through hole; the included angles theta between the central lines of all the circular through holes and the axial lead of the annular thin-wall structure are equal;
the diameters of the upper end surface and the lower end surface of the annular thin-wall structure are different;
θ takes 40 ° < θ <80 °;
the aperture d of all the round through holes is equal, and 4mm < d <12 mm;
the liquid pressure range is 1-2 MPa, the gas pressure range is 2-3 MPa, the temperature range is 200-300K, and the gas can be dissolved in the liquid.
2. The gas blending structure capable of suppressing low-frequency oscillation and high efficiency according to claim 1, wherein: the annular thin-wall structure is made of stainless steel.
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| CN201910223088.6A CN110030114B (en) | 2019-03-22 | 2019-03-22 | Restrain high-efficient gas mixing structure of low frequency oscillation |
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| CN111766091B (en) * | 2020-07-07 | 2022-03-11 | 西安航天动力试验技术研究所 | Calibration system and method of low-frequency pulsation suppression device for ground test |
| CN112324590B (en) * | 2020-09-30 | 2021-11-16 | 北京航天动力研究所 | Rectifying device for inhibiting single-side pulsation of gas pressure in multi-way pipeline |
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| DE1257489B (en) * | 1965-05-15 | 1967-12-28 | Boelkow Gmbh | Rocket engine for liquid fuels with a main combustion chamber and a pre-combustion chamber |
| CN201606162U (en) * | 2010-02-04 | 2010-10-13 | 西北工业大学 | Oil supply system of pulse detonation engine |
| FR2972225B1 (en) * | 2011-03-04 | 2015-11-20 | Snecma | INJECTOR FOR INJECTION HEAD OF A COMBUSTION CHAMBER |
| CN105327628B (en) * | 2015-11-27 | 2017-08-25 | 北京航天动力研究所 | A kind of low flow resistance eddy flow diffusion air and liquid mixer |
| CN106050472A (en) * | 2016-07-08 | 2016-10-26 | 西北工业大学 | Turbo-rocket combined ramjet engine and operating method thereof |
| CN109372655A (en) * | 2018-12-13 | 2019-02-22 | 西安航天动力研究所 | The pre- pressure charging system of gas-liquid parallel drive and method that high-altitude low entry pressure starts |
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