CN114273103B - Mixed diffusion section structure of arc-shaped gas-gas ejector - Google Patents
Mixed diffusion section structure of arc-shaped gas-gas ejector Download PDFInfo
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- CN114273103B CN114273103B CN202111114291.3A CN202111114291A CN114273103B CN 114273103 B CN114273103 B CN 114273103B CN 202111114291 A CN202111114291 A CN 202111114291A CN 114273103 B CN114273103 B CN 114273103B
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Abstract
The invention discloses a mixed diffusion section structure of an arc-shaped gas-gas ejector, relates to the technical field of refrigeration and heat pump equipment, and solves the problem that static pressure of a working medium generates step-type lifting in the process of mixing and compressing the high-pressure and low-pressure mixed working medium, reduces the instability of the work of the ejector, and improves the injection coefficient of the ejector. The invention adopts the arc pipe section structure to replace the original structure combining the straight pipe section and the conical pipe section, so that the hydrostatic pressure and the speed are gently changed in the pipe section, the possibility of generating forward shock waves is reduced or eliminated, the irreversible loss in the compression process is reduced, the injection coefficient of the ejector is effectively improved, the injection type refrigeration/heat pump cycle adopting the ejector has higher operation efficiency and stability, the operation effect is greatly improved, and the application range of the injection type refrigeration/heat pump cycle is expanded.
Description
Technical Field
The invention relates to the technical field of refrigeration and heat pump equipment, in particular to an arc-shaped gas-gas ejector mixed diffusion section structure.
Background
The jet refrigeration/heat pump cycle is a refrigeration/heat pump cycle system which is driven by heat energy and does not contain a mechanical compression part, the cycle system can generate high-pressure working fluid under the drive of a high-temperature heat source, so that low-pressure fluid generated under the action of a low-temperature heat source is injected into an ejector and is condensed to release heat after being lifted to intermediate pressure, and the heat of the low-level heat source is extracted by adopting the flow, thereby realizing the function of the refrigeration/heat pump. The ejector is a key component of an ejector type refrigeration/heat pump cycle, has a significant influence on the operation effect of the whole system, and the structural schematic diagram of the ejector type refrigeration/heat pump cycle is shown in fig. 1. The design method of the related theory and the structure of the ejector is already formed, however, the traditional ejector structure can cause the violent forward shock wave effect to be generated in the mixed diffusion section, the ejection coefficient is seriously attenuated under a certain backpressure condition, the efficiency of the ejector is as low as 0.1-0.4, the operation efficiency of the ejection type refrigeration/heat pump circulation is seriously influenced, and the circulating system is greatly reduced in applicable occasions compared with the mechanical compression circulation.
The traditional ejector has the defects that in the process of mixing and compressing high-pressure and low-pressure mixed working media, the static pressure of the working media can generate step-type lifting, the ejector is unstable in work, and the ejection coefficient of the ejector is low, wherein the mixing and diffusing section of the traditional ejector is in a form of combining a straight pipe section with a tapered pipe section, as shown in fig. 2.
Disclosure of Invention
In view of the above-mentioned problems, the present invention provides a mixing diffuser structure of an arc-shaped gas-gas injector.
In order to achieve the purpose, the invention adopts the technical scheme that:
an arc-shaped gas-gas ejector mixing diffuser structure, comprising: the ejector mixing diffusion section 2 is of a cylindrical structure with a continuously variable cross section from a gas inlet direction to an outlet direction, the inner diameter of the middle part of the ejector mixing diffusion section 2 is smaller than the inner diameter of an inlet and the inner diameter of an outlet of the ejector mixing diffusion section, the inner diameter of the inlet of the ejector mixing diffusion section 2 is smaller than the inner diameter of the outlet of the ejector mixing diffusion section 2, the inlet of the ejector mixing diffusion section 2 is used for being connected with the outlet of a suction section 3 of an ejector, a tangent plane corresponding to the inner wall of the ejector mixing diffusion section 2 on a longitudinal section along the axial direction of the ejector mixing diffusion section is composed of a plurality of points R, and the points R are determined by the following formula:
wherein the intersection point of a cross section perpendicular to the central axis 1 of the injector mixing diffusion section at the inlet of the injector mixing diffusion section 2 and the central axis 1 of the injector mixing diffusion section is taken as an origin, and x represents the injector mixing diffusion sectionThe distance between any point on the central axis 1 and the origin, and the value range of x is 0-L 0 ；L 0 Represents the maximum distance from the inlet to the outlet of the ejector mixing diffuser section 2; r represents a cross-sectional radius of a cross-section perpendicular to the injector mixing diffuser central axis 1 at any point on the injector mixing diffuser central axis 1; r 0 A section radius representing a cross-section at the inlet of the injector mixing diffuser 2 perpendicular to the injector mixing diffuser central axis 1; a is 0 、a 1 、a 2 、a 3 、a 4 、a 5 And a 6 All are proportionality coefficients determined according to design working condition conditions; the arc-shaped gas ejector mixed diffusion section structure is obtained by combining an equal momentum calculation model and a mathematical analysis method for calculation, and the mixed-diffusion section structure is a cavity structure formed by taking a sextic polynomial arc as a bus and rotating around a central shaft of the mixed-diffusion section; wherein a is 0 、a 1 、a 2 、a 3 、a 4 、a 5 、a 6 C is a proportional coefficient obtained by fitting according to the calculation method, the proportional coefficients are different under different working conditions, and the proportional coefficient is a constant value under the same working condition;
L 0 determined by the following equation:
L 0 ＝cR 0 (2)
wherein c is a proportionality coefficient determined according to the working condition of the design working condition, R 0 The value range of (a) is 5-500mm.
In the mixed diffusion section structure of the arc-shaped gas-gas ejector, the spray pipe 3 is provided with the working fluid interface 4 and the injection fluid interface 5, the high-pressure working fluid flows into the suction section 3 of the ejector from the working fluid interface 4 and flows into the mixed diffusion section 2 structure of the arc-shaped gas-gas ejector, and the low-pressure injection fluid flows into the suction section 3 of the ejector from the injection fluid interface 5 and flows into the mixed diffusion section 2 structure of the arc-shaped gas-gas ejector.
The mixed diffusion section structure of the arc-shaped gas-gas ejector is characterized in that the working conditions of the design working condition are as follows: the working medium is R141b, the temperature of the high-pressure working fluid is 90-100 ℃, the superheat degree is 3-5 ℃, and the working pressure is 539-677kPa; the temperature of the low-pressure injection fluid is 40-50 ℃, the superheat degree is 3-5 ℃, and the injection pressure is 132-183kPa; the back pressure of the ejector is 225-298kPa;
the proportionality coefficient of the formula (1) is as follows:
a 0 ＝1.000
a 1 ＝-0.0439
a 2 ＝0.0146
a 3 ＝-3.0575×10 -3
a 4 ＝3.3175×10 -4
a 5 ＝-1.6808×10 -5
a 6 ＝3.2848×10 -7
the proportionality coefficient of the formula (2) is as follows:
c＝20.4379
R 0 ＝100mm
the value range of x is as follows: 0-2043.79mm
And (3) obtaining a plurality of points R according to the parameter values and the formula (1), thereby obtaining a first tangent plane consisting of the points R and forming the arc-shaped gas-gas injector mixed diffusion section 2 structure.
The mixed diffusion section structure of the arc-shaped gas-gas ejector is characterized in that the working conditions of the design working condition are as follows: the working medium is R245fa, the temperature of the high-pressure working fluid is 90-100 ℃, the superheat degree is 3-5 ℃, and the working pressure is 1006-1265kPa; the temperature of the low-pressure injection fluid is 40-50 ℃, the superheat degree is 3-5 ℃, and the injection pressure is 250-344kPa; the back pressure of the ejector is 419-553kPa;
the proportionality coefficient of the formula (1) is as follows:
a 0 ＝1.000
a 1 ＝-0.0429
a 2 ＝0.0142
a 3 ＝-3.1545×10 -3
a 4 ＝3.7467×10 -4
a 5 ＝-2.0768×10 -5
a 6 ＝4.4546×10 -7
the proportionality coefficient of the formula (2) is as follows:
c＝18.7403
R 0 ＝100mm
the value range of x is as follows: 0-1874.03mm
And (3) obtaining a plurality of points R according to the parameter values and the formula (1), thereby obtaining a second tangent plane consisting of the plurality of points R and forming the arc-shaped gas-gas ejector mixing diffusion section 2 structure.
The mixed diffusion section structure of the arc-shaped gas-gas ejector is characterized in that the working conditions of the design working condition are as follows: using a working medium R123, wherein the temperature of the high-pressure working fluid is 90-100 ℃, the superheat degree is 3-5 ℃, and the working pressure is 624-785kPa; the temperature of the low-pressure injection fluid is 40-50 ℃, the superheat degree is 3-5 ℃, and the injection pressure is 155-212kPa; the back pressure of the ejector is 260-344kPa;
the proportionality coefficient of the formula (1) is as follows:
a 0 ＝1.000
a 1 ＝-0.0426
a 2 ＝0.0141
a 3 ＝-3.1810×10 -3
a 4 ＝3.9228×10 -4
a 5 ＝-2.2596×10 -5
a 6 ＝5.0466×10 -7
the proportionality coefficient of the formula (2) is as follows:
c＝18.0573
R 0 ＝100mm
the value range of x is as follows: 1805.73mm
And (3) obtaining a plurality of points R according to the parameter values and the formula (1), thereby obtaining a third tangent plane consisting of the plurality of points R and forming the arc-shaped gas-gas injector mixed diffusion section 2 structure.
Due to the adoption of the technology, compared with the prior art, the invention has the following positive effects:
(1) The invention adopts the arc pipe section structure to replace the original structure combining the straight pipe section and the conical pipe section, so that the hydrostatic pressure and the speed are gently changed in the pipe section, the possibility of generating forward shock waves is reduced or eliminated, and the irreversible loss in the compression process is reduced;
(2) The invention can effectively improve the injection coefficient of the ejector, and the injection coefficient reaches 0.56, thereby the injection type refrigeration/heat pump cycle adopting the ejector has higher operation efficiency and stability;
(3) The invention can greatly improve the injection coefficient of the original injector, the improvement amplitude is about 34 percent, the injection type refrigeration/heat pump cycle of the injector with the structural form can greatly improve the operation effect, and the application range of the injection type refrigeration/heat pump cycle is greatly expanded.
Drawings
Fig. 1 is a schematic view of a gas injector.
FIG. 2 is a cross-sectional schematic view of a conventional injector in the form of a mixing diffuser configuration.
FIG. 3 is a structural schematic diagram of a mixing diffuser structure of an arc-shaped gas injector according to the present invention.
FIG. 4 is a coordinate axis of origin of a mixing and diffusing segment structure of an arc-shaped gas injector according to the present invention.
In the drawings: 1. the central axis of the injector mixing diffusion section; 2. an injector mixing diffuser section; 3. a nozzle; 4. a working fluid interface; 5. an injection fluid interface.
Detailed Description
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Referring to fig. 1 to 4, there is shown an arc-shaped gas injector mixing diffuser structure, including: the ejector mixing diffusion section 2 is of a cylindrical structure with a continuously variable cross section from a gas inlet direction to an outlet direction, the inner diameter of the middle part of the ejector mixing diffusion section 2 is smaller than the inner diameter of the inlet and the inner diameter of the outlet of the ejector mixing diffusion section, the inner diameter of the inlet of the ejector mixing diffusion section 2 is smaller than the inner diameter of the outlet of the ejector mixing diffusion section, the inlet of the ejector mixing diffusion section 2 is used for being connected with the outlet of the suction section 3 of the ejector, a section line corresponding to the inner wall of the ejector mixing diffusion section 2 along the axial longitudinal section of the ejector mixing diffusion section consists of a plurality of points R, and the points R are determined by the following formula:
wherein, the intersection point of the cross section at the inlet of the injector mixed diffusion section 2, which is vertical to the central axis 1 of the injector mixed diffusion section, and the central axis 1 of the injector mixed diffusion section is taken as an origin, x represents the distance between any point on the central axis 1 of the injector mixed diffusion section and the origin, and the value range of x is 0-L 0 ；L 0 Represents the maximum distance from the inlet to the outlet of the injector mixing diffuser section 2; r represents a cross-sectional radius of a cross-section perpendicular to the injector mixing diffuser central axis 1 at any point on the injector mixing diffuser central axis 1; r 0 A section radius representing a cross section perpendicular to the central axis 1 of the injector mixing diffuser at the inlet of the injector mixing diffuser 2; a is 0 、a 1 、a 2 、a 3 、a 4 、a 5 And a 6 All are proportionality coefficients determined according to design working condition conditions; the arc-shaped gas-gas ejector mixed diffusion section structure is obtained by combining an equal momentum calculation model and a mathematical analysis method for calculation, and is a cavity structure formed by taking a sextic polynomial arc as a bus and rotating around a central shaft of the mixed diffusion section; wherein a is 0 、a 1 、a 2 、a 3 、a 4 、a 5 、a 6 C is a proportional coefficient obtained by fitting according to the calculation method, the proportional coefficients are different under different working conditions, and the proportional coefficient is a constant value under the same working condition;
L 0 determined by the following equation:
L 0 ＝cR 0 (2)
wherein, cProportional coefficient, R, determined for operating conditions according to design operating conditions 0 The value range of (A) is 5-500mm.
Further, in a preferred embodiment, the nozzle 3 is provided with a working fluid interface 4 and a pilot fluid interface 5, the high-pressure working fluid flows into the suction section 3 of the ejector from the working fluid interface 4 and then flows into the arc-shaped gas-gas ejector mixing diffusion section 2 structure, and the low-pressure pilot fluid flows into the suction section 3 of the ejector from the pilot fluid interface 5 and then flows into the arc-shaped gas-gas ejector mixing diffusion section 2 structure.
Further, in a preferred embodiment, the working conditions of the design working condition are as follows: the working medium is R141b, the temperature of the high-pressure working fluid is 90-100 ℃, the superheat degree is 3-5 ℃, and the working pressure is 539-677kPa; the temperature of the low-pressure injection fluid is 40-50 ℃, the superheat degree is 3-5 ℃, and the injection pressure is 132-183kPa; the back pressure of the ejector is 225-298kPa;
the proportionality coefficient of equation (1) is:
a 0 ＝1.000
a 1 ＝-0.0439
a 2 ＝0.0146
a 3 ＝-3.0575×10 -3
a 4 ＝3.3175×10 -4
a 5 ＝-1.6808×10 -5
a 6 ＝3.2848×10 -7
the proportionality coefficient of equation (2) is:
c＝20.4379
R 0 ＝100mm
the value range of x is as follows: 0-2043.79mm
And (3) obtaining a plurality of points R according to the parameter values and the formula (1), thereby obtaining a first tangent plane consisting of the points R and forming the structure of the arc-shaped gas-gas ejector mixing diffusion section 2.
Further, in a preferred embodiment, the working conditions of the design working condition are as follows: the working medium is R245fa, the temperature of the high-pressure working fluid is 90-100 ℃, the superheat degree is 3-5 ℃, and the working pressure is 1006-1265kPa; the temperature of the low-pressure injection fluid is 40-50 ℃, the superheat degree is 3-5 ℃, and the injection pressure is 250-344kPa; the back pressure of the ejector is 419-553kPa;
the proportionality coefficient of formula (1) is:
a 0 ＝1.000
a 1 ＝-0.0429
a 2 ＝0.0142
a 3 ＝-3.1545×10 -3
a 4 ＝3.7467×10 -4
a 5 ＝-2.0768×10 -5
a 6 ＝4.4546×10 -7
the proportionality coefficient of equation (2) is:
c＝18.7403
R 0 ＝100mm
the value range of x is as follows: 0-1874.03mm
And (3) obtaining a plurality of points R according to the parameter values and the formula (1), thereby obtaining a second tangent plane consisting of the plurality of points R and forming the structure of the arc-shaped gas-gas ejector mixing diffusion section 2.
Further, in a preferred embodiment, the working conditions of the design working condition are as follows: using a working medium R123, wherein the temperature of the high-pressure working fluid is 90-100 ℃, the superheat degree is 3-5 ℃, and the working pressure is 624-785kPa; the temperature of the low-pressure injection fluid is 40-50 ℃, the superheat degree is 3-5 ℃, and the injection pressure is 155-212kPa; the back pressure of the ejector is 260-344kPa;
the proportionality coefficient of equation (1) is:
a 0 ＝1.000
a 1 ＝-0.0426
a 2 ＝0.0141
a 3 ＝-3.1810×10 -3
a 4 ＝3.9228×10 -4
a 5 ＝-2.2596×10 -5
a 6 ＝5.0466×10 -7
the proportionality coefficient of equation (2) is:
c＝18.0573
R 0 ＝100mm
the value range of x is as follows: 1805.73mm
And (3) obtaining a plurality of points R according to the parameter values and the formula (1), thereby obtaining a third tangent plane consisting of the plurality of points R and forming the structure of the arc-shaped gas-gas ejector mixing diffusion section 2.
The above are merely preferred embodiments of the present invention, and the embodiments and the protection scope of the present invention are not limited thereby.
The present invention also has the following embodiments in addition to the above:
in a further embodiment of the invention, the method is characterized in that the arc line type of the sextic polynomial is adopted to replace the straight line type of the traditional gas-gas ejector, so that the mixed diffusion section of the arc gas-gas ejector is adopted to replace the mixed diffusion section part of the traditional gas-gas ejector with a straight-pipe section conical pipe, forward shock waves are not generated in the compression process of the mixed fluid formed by mixing the high-pressure working fluid and the low-pressure ejector fluid in the mixed diffusion section, the irreversible loss caused by the shock waves is reduced, and the injection coefficient of the ejector is improved under the working condition that the back pressure of the ejector is the same.
In a further embodiment of the present invention, the ejector refrigeration/heat pump cycle is a refrigeration/heat pump cycle system driven by heat energy and not including a mechanical compression component, and the cycle can generate a high-pressure working fluid under the drive of a high-temperature heat source, so that a low-pressure fluid generated under the action of a low-temperature heat source is ejected in an ejector, and is raised to an intermediate pressure for condensation and heat dissipation, and the heat of the low-level heat source is extracted by using the flow, thereby realizing the function of the refrigeration/heat pump. The ejector is a key component of an ejector type refrigeration/heat pump cycle, and has a significant influence on the operation effect of the whole system, and the schematic structural diagram of the ejector is shown in fig. 1. The relevant theory of the ejector and the design method of the ejector structure are already formed, however, the traditional ejector structure can cause the violent forward shock wave effect to be generated in the mixed diffusion section, under the condition of certain backpressure, the ejection coefficient is seriously attenuated, the efficiency of the ejector is as low as 0.1-0.4, the operation efficiency of the ejection type refrigeration/heat pump cycle is seriously influenced, and the applicable occasions of the cycle system are greatly reduced compared with the mechanical compression cycle.
In a further embodiment of the invention, a section line corresponding to the inner wall of the longitudinal section of the injector mixing diffusion section along the axial direction is an injector mixing diffusion section cavity bus bar 2, and the injector mixing diffusion section cavity bus bar 2 rotates around the central axis 1 of the injector mixing diffusion section to form an arc-shaped gas-gas injector mixing diffusion section structure.
In a further embodiment of the present invention, the mixing diffusion section of the conventional injector is formed by combining a straight pipe section and a tapered pipe section, as shown in fig. 2, which has the disadvantage that during the process of mixing and compressing the high-pressure and low-pressure mixed working medium therein, the static pressure of the working medium may generate a step-like increase, which leads to instability of the operation of the injector, and the injection coefficient of the injector is low.
In a further embodiment of the invention, the arc-line type gas-gas ejector mixed diffusion section structure is obtained by combining an equal momentum calculation model and a mathematical analysis method, and is a cavity structure formed by taking a sextic polynomial arc as a bus and rotating around a central axis of the mixed diffusion section. The ejector with the arc-shaped gas-gas ejector mixed diffusion section structure can ensure that the dynamic pressure and the static pressure of medium-pressure fluid formed by mixing high-pressure fluid and low-pressure fluid in the ejector uniformly change in the compression process, reduces or even eliminates the forward shock wave generated by the step change of the static pressure of the fluid, has small irreversible loss and excellent thermodynamic performance, realizes the high-efficiency compression of the mixed fluid in the working process, and improves the operating efficiency of the ejector.
In a further embodiment of the invention, the technical scheme is that the arc-shaped gas-gas ejector mixing diffusion section structure comprises a mixing diffusion section central axis 1 and a mixing diffusion section cavity bus 2, and is characterized in that the mixing diffusion section central axis 1 is formed by connecting the central points of all cross sections of an ejector; the mixed diffusion section cavity bus 2 is formed by six-degree polynomial control with the central axis 1 of the mixed diffusion section as a reference. The arc-shaped gas-gas ejector mixed diffusion section structure is formed by rotating a mixed diffusion section cavity bus bar 2 around a mixed diffusion section central axis 1, and the inside of the structure is subjected to mechanical polishing treatment, so that the frictional resistance of fluid flowing in the structure can be reduced, and the irreversible loss in the mixed fluid compression process is further reduced.
In a further embodiment of the invention, the original structure combining the straight pipe section and the tapered pipe section is replaced by the arc pipe section structure, so that the hydrostatic pressure and the speed are smoothly changed in the pipe section, the possibility of generating forward shock waves is reduced or eliminated, and the irreversible loss in the compression process is reduced;
in a further embodiment of the invention, the injection coefficient of the ejector can be effectively improved to reach 0.56, so that the injection type refrigeration/heat pump cycle adopting the ejector has higher operation efficiency and stability.
In a further embodiment of the invention, the injection coefficient of the original injector can be greatly improved, the improvement amplitude is about 34%, the operation effect of the injection type refrigeration/heat pump cycle of the injector with the structural form can be greatly improved, and the application range of the injection type refrigeration/heat pump cycle is greatly expanded.
In a further embodiment of the present invention, please refer to fig. 2 to 3, wherein fig. 2 is a structural diagram of a mixing diffuser of a conventional injector, and fig. 3 is a structural diagram of a mixing diffuser of an arc-type gas injector. The mixed diffusion section cavity bus 2 in the arc-shaped gas-gas ejector mixed diffusion section structure provided by the invention changes the mixed diffusion section bus broken line in the mixed diffusion section structure of the traditional ejector into the mixed diffusion section cavity bus 2 in the arc-shaped gas-gas ejector mixed diffusion section structure according to the equal momentum calculation model and the method of thermodynamic law and mathematical analysis under the premise of meeting the requirement that the momentum of the mixed fluid working medium uniformly changes in the mixed diffusion section. The mixed diffusion section cavity bus 2 in the arc-shaped gas-gas ejector mixed diffusion section structure is controlled by a sextic polynomial in a specific form according to different working conditions.
In a further embodiment of the invention, FIG. 2 is a schematic cross-sectional view of a conventional injector, as shown, the mixing diffuser section of which is in the form of a combination of a straight section and a tapered section.
Taking the intersection point of the cross section at the starting point of the mixed diffusion section of the arc-shaped gas-gas ejector and the central axis 1 of the mixed diffusion section as a coordinate origin, marking as O, and taking the central axis 1 of the mixed diffusion section as the transverse coordinate of an orthogonal coordinate system, and marking as an X axis; taking the radial direction of the mixed diffusion section of the ejector as a longitudinal coordinate, recording the longitudinal coordinate as an R axis, and showing the general form of an arc line of a cubic polynomial as shown in a formula (1), wherein the relation between the distance from the starting point of the mixed diffusion section of the ejector to the outlet plane of the mixed diffusion section of the ejector and the radius at the starting point of the mixed diffusion section of the ejector under the design working condition is shown in a formula (2):
L 0 ＝cR 0 (2)
wherein R is 0 Denotes the radius, L, at the beginning of the injector mixing diffuser under the design conditions 0 And c is a proportionality coefficient. And finally, the sextic polynomial arc bus rotates around the central axis 1 of the mixed diffusion section, so that a novel cavity structure form of the mixed diffusion section of the ejector can be obtained.
In a further embodiment of the present invention, a specific operating condition under which the injector operates is taken as a specific implementation manner of the present invention, and a specific implementation manner of the present invention is described with reference to fig. 3, where the operating condition of the present implementation manner is: the working medium used in the invention is R141b, the temperature of the high-pressure working fluid is 90-100 ℃, the superheat degree is 3-5 ℃, and the working pressure is 539-677kPa; the temperature of the low-pressure injection fluid is 40-50 ℃, the superheat degree is 3-5 ℃, and the injection pressure is 132-183kPa; the back pressure of the ejector is 225-298kPa. Under the specific conditions of this example, the scale factor of the form of the sixth order polynomial, as in formula (1), is:
a 0 ＝1.0059
a 1 ＝-0.0439
a 2 ＝0.0146
a 3 ＝-3.0575×10 -3
a 4 ＝3.3175×10 -4
a 5 ＝-1.6808×10 -5
a 6 ＝3.2848×10 -7
L 0 and R 0 C =20.4379. According to the radius R at the starting point of the mixed diffusion section of the injector under the design working condition 0 The resulting control forms a different sextic polynomial curve, depending on the control. Therefore, the obtained arc-shaped gas-gas ejector mixing diffusion section has different structures.
In a further embodiment of the present invention, a specific operating condition under which the injector operates is taken as a specific implementation mode of the present invention, and a second implementation mode of the present invention is described with reference to fig. 4, where the operating conditions of the present implementation mode are as follows: the working medium used in the invention is R245fa, the temperature of the high-pressure working fluid is 90-100 ℃, the superheat degree is 3-5 ℃, and the working pressure is 1006-1265kPa; the temperature of the low-pressure injection fluid is 40-50 ℃, the superheat degree is 3-5 ℃, and the injection pressure is 250-344kPa; the back pressure of the ejector is 419-553kPa. Under the specific conditions of this example, the scale factor of the form of the sixth order polynomial, as in formula (1), is:
a 0 ＝1.0044
a 1 ＝-0.0429
a 2 ＝0.0142
a 3 ＝-3.1545×10 -3
a 4 ＝3.7467×10 -4
a 5 ＝-2.0768×10 -5
a 6 ＝4.4546×10 -7
L 0 and R 0 Has a proportionality coefficient ofc =18.7403. According to the radius R at the starting point of the mixed diffusion section of the injector under the design working condition 0 The six-degree polynomial curve formed by control is different. Therefore, the obtained arc-shaped gas-gas ejector mixing diffusion section has different structures.
In a further embodiment of the present invention, a specific working condition under which the injector works is used as a specific implementation manner of the present invention, and in a third implementation manner, the working condition of the present implementation manner is as follows: the working medium used in the invention is R123, the temperature of the high-pressure working fluid is 90-100 ℃, the superheat degree is 3-5 ℃, and the working pressure is 624-785kPa; the temperature of the low-pressure injection fluid is 40-50 ℃, the superheat degree is 3-5 ℃, and the injection pressure is 155-212kPa; the back pressure of the ejector is 260-344kPa. Under the specific conditions of this example, the scale factor of the form of the sixth order polynomial, as in formula (1), is:
a 0 ＝1.0069
a 1 ＝-0.0426
a 2 ＝0.0141
a 3 ＝-3.1810×10 -3
a 4 ＝3.9228×10 -4
a 5 ＝-2.2596×10 -5
a 6 ＝5.0466×10 -7
the proportionality coefficient of equation (2) is:
c＝18.0573
L 0 and R 0 C =18.0573. According to the radius R at the starting point of the mixed diffusion section of the injector under the design working condition 0 The six-degree polynomial curve formed by control is different. Therefore, the obtained arc-shaped gas-gas ejector mixing diffusion section has different structures.
In a further embodiment of the invention, when x =0, R = R0.
In a further embodiment of the present invention, the gas-gas injector, i.e., the gas-gas injector, refers to a gas dynamic component with a simple structure, which uses gas as a working medium of the injector, injects low-temperature and low-pressure gas from the injection fluid interface by high-temperature and high-pressure gas flowing in from the working fluid interface, and ejects mixed fluid after fully mixing in the mixing diffusion section structure.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (4)
1. The arc line type gas-gas ejector mixed diffusion section structure is characterized in that an ejector mixed diffusion section (2) is of a cylindrical structure with a continuously variable cross section from a gas inlet direction to an outlet direction, forward shock waves are not generated in the compression process of mixed fluid formed by mixing high-pressure working fluid and low-pressure injection fluid through the arc line type of a sextic polynomial, irreversible loss caused by the shock waves is reduced, the injection coefficient of an ejector is improved under the working condition that the back pressure of the ejector is the same, the middle inner diameter of the ejector mixed diffusion section (2) is smaller than the inlet inner diameter and the outlet inner diameter of the ejector mixed diffusion section, the inlet inner diameter of the ejector mixed diffusion section (2) is smaller than the outlet inner diameter of the ejector mixed diffusion section, the inlet of the ejector mixed diffusion section (2) is used for being connected with the outlet of a suction section (3) of the ejector, a section line corresponding to the inner wall of the ejector mixed diffusion section (2) on the axial longitudinal section is composed of a plurality of points R, and the points R are determined by the following formula:
the cross section of the inlet of the ejector mixed diffusion section (2) perpendicular to the central axis (1) of the ejector mixed diffusion section and the intersection point of the central axis (1) of the ejector mixed diffusion section are used as an origin, x represents the distance between any point on the central axis (1) of the ejector mixed diffusion section and the origin, and the value range of x is 0-L 0 ；L 0 Showing the injector mixing diffuser section (2) inletMaximum distance from the exit; r represents the section radius of a cross section perpendicular to the central axis (1) of the injector mixing diffuser at any point on the central axis (1) of the injector mixing diffuser; r 0 A section radius representing a cross-section at the inlet of the injector mixing diffuser (2) perpendicular to the injector mixing diffuser central axis (1); a is 0 、a 1 、a 2 、a 3 、a 4 、a 5 And a 6 All are proportionality coefficients determined according to design working condition conditions; the arc-shaped gas-gas ejector mixed diffusion section structure is obtained by combining an equal momentum calculation model and a mathematical analysis method for calculation, and is a cavity structure formed by taking a sextic polynomial arc as a bus and rotating around a central shaft of the mixed diffusion section; wherein a is 0 、a 1 、a 2 、a 3 、a 4 、a 5 、a 6 C is a proportional coefficient obtained by fitting according to the calculation method, the proportional coefficients are different under different working conditions, and the proportional coefficient is a constant value under the same working condition;
L 0 determined by the following equation:
L 0 ＝cR 0 (2)
wherein c is a proportionality coefficient determined according to the working condition of the design working condition, R 0 The value range of (A) is 5-500mm;
the high-pressure working fluid flows into the suction section (3) of the ejector from the working fluid interface (4) and then flows into the arc-line-type gas-gas ejector mixed diffusion section (2) structure, and the low-pressure injection fluid flows into the suction section (3) of the ejector from the injection fluid interface (5) and then flows into the arc-line-type gas-gas ejector mixed diffusion section (2) structure.
2. The arc-shaped gas-gas ejector mixing diffuser segment structure of claim 1, wherein the working conditions of the design working conditions are as follows: the working medium is R141b, the temperature of the high-pressure working fluid is 90-100 ℃, the superheat degree is 3-5 ℃, and the working pressure is 539-677kPa; the temperature of the low-pressure injection fluid is 40-50 ℃, the superheat degree is 3-5 ℃, and the injection pressure is 132-183kPa; the back pressure of the ejector is 225-298kPa;
the proportionality coefficient of the formula (1) is as follows:
a 0 ＝1.000
a 1 ＝-0.0439
a 2 ＝0.0146
a 3 ＝-3.0575×10 -3
a 4 ＝3.3175×10 -4
a 5 ＝-1.6808×10 -5
a 6 ＝3.2848×10 -7
the proportionality coefficient of the formula (2) is as follows:
c＝20.4379
R 0 ＝100mm
the value range of x is as follows: 0-2043.79mm
And (3) obtaining a plurality of points R according to the parameter values and the formula (1), thereby obtaining a first tangent line consisting of the plurality of points R and forming the structure of the arc-shaped gas-gas ejector mixing diffusion section (2).
3. The arc-shaped gas-gas ejector mixing diffuser segment structure of claim 1, wherein the working conditions of the design working conditions are as follows: the working medium is R245fa, the temperature of the high-pressure working fluid is 90-100 ℃, the superheat degree is 3-5 ℃, and the working pressure is 1006-1265kPa; the temperature of the low-pressure injection fluid is 40-50 ℃, the superheat degree is 3-5 ℃, and the injection pressure is 250-344kPa; the back pressure of the ejector is 419-553kPa;
the proportionality coefficient of the formula (1) is as follows:
a 0 ＝1.000
a 1 ＝-0.0429
a 2 ＝0.0142
a 3 ＝-3.1545×10 -3
a 4 ＝3.7467×10 -4
a 5 ＝-2.0768×10 -5
a 6 ＝4.4546×10 -7
the proportionality coefficient of the formula (2) is as follows:
c＝18.7403
R 0 ＝100mm
the value range of x is as follows: 0-1874.03mm
And (2) obtaining a plurality of points R according to the parameter values and the formula (1), thereby obtaining a second tangent line consisting of the plurality of points R and forming the structure of the arc-shaped gas-gas ejector mixing diffusion section (2).
4. The arc-shaped gas-gas ejector mixing diffuser segment structure of claim 1, wherein the working conditions of the design working conditions are as follows: using a working medium R123, wherein the temperature of the high-pressure working fluid is 90-100 ℃, the superheat degree is 3-5 ℃, and the working pressure is 624-785kPa; the temperature of the low-pressure injection fluid is 40-50 ℃, the superheat degree is 3-5 ℃, and the injection pressure is 155-212kPa; the back pressure of the ejector is 260-344kPa;
the proportionality coefficient of the formula (1) is as follows:
a 0 ＝1.000
a 1 ＝-0.0426
a 2 ＝0.0141
a 3 ＝-3.1810×10 -3
a 4 ＝3.9228×10 -4
a 5 ＝-2.2596×10 -5
a 6 ＝5.0466×10 -7
the proportionality coefficient of the formula (2) is as follows:
c＝18.0573
R 0 ＝100mm
the value range of x is as follows: 1805.73mm
And (3) obtaining a plurality of points R according to the parameter values and the formula (1), thereby obtaining a third tangent line consisting of the plurality of points R and forming the structure of the arc-shaped gas-gas ejector mixing diffusion section (2).
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| WO2009114176A2 (en) * | 2008-03-13 | 2009-09-17 | Machflow Energy, Inc. | Cylindrical bernoulli heat pumps |
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