CN114781203A - Method and system for extracting impeller mechanical local loss force coefficient - Google Patents
Method and system for extracting impeller mechanical local loss force coefficient Download PDFInfo
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Abstract
The invention discloses a method and a system for extracting a local loss force coefficient of an impeller machine, wherein the method comprises the following steps: calculating a basic flow field of the mechanical flow field of the impeller according to the set boundary conditions of the inlet and the outlet of the mechanical flow field of the impeller to obtain the basic flow field under different working conditions; calculating local loss force in a passage of a vane of the impeller machine based on a relation between the local loss force and a change rate of entropy along a streamline in the basic flow field; extracting a local loss force coefficient on a set streamline; extracting local loss force coefficients along the average flow direction under different working conditions to obtain the distribution of the local loss force coefficients along the flow direction in the impeller mechanical blade channel under different working conditions; according to the method, the local loss force coefficient is extracted according to the basic flow field obtained by the steady calculation, so that the analytic relation between the local loss force and the local flow parameters in the impeller machinery can be effectively established, and the construction of a volume force source item in a blade channel of the impeller machinery is facilitated.
Description
Technical Field
The invention belongs to the technical field of fluid machinery, particularly relates to a method for researching mechanical performance and flow stability of an impeller, and particularly relates to a method and a system for extracting a local loss force coefficient of the impeller.
Background
The turbine is an energy conversion machine, and the force of the blades on the flow field plays a decisive role in the evolution of the flow field. The blade force can be decomposed into two parts according to the action effect: one part is a turning force which is vertical to the surface of the blade and deflects the airflow; the other part is tangential to the blade surface, resulting in lost force. When a numerical simulation method is adopted to research the mechanical performance and the flow stability of the impeller, the loss force model is added into the source term of the control equation to replace the influence of viscosity and other loss source terms, so that the difficulty of numerical solution can be reduced, and the calculation period can be shortened.
In order to convert the non-homogeneous equation with viscous source terms into an easily solved homogeneous equation, an analytical relationship between loss force and flow parameters must be established. At present, the effect of the blades on the flow field can be replaced by distributed volume force to take the influence of loss source items such as viscosity and the like into account, the existing method for constructing the distributed volume force is to carry out loss prediction based on various empirical loss models, the construction process is complicated, and the accuracy cannot be ensured.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for extracting the local loss force coefficient of the impeller machinery, which extracts the local loss force coefficient according to a basic flow field obtained by steady calculation, and obtains the distribution of the local loss force coefficient along the flow direction on a specific streamline under a certain working condition and the distribution of the local loss force coefficient along the average flow direction under different working conditions. The extraction method is simple and high in accuracy, and the analytic relation between the local loss force in the impeller machinery and the local flow parameters can be effectively established.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for extracting a mechanical local loss force coefficient of an impeller, comprising the steps of:
a. calculating a basic flow field of the impeller mechanical flow field according to the set boundary conditions of an inlet and an outlet of the impeller mechanical flow field to obtain the basic flow field under different working conditions;
b. calculating local loss force in a passage of a vane of the impeller machine based on a relation between the local loss force and a change rate of entropy along a streamline in the basic flow field;
c. extracting a local loss force coefficient on a set streamline;
d. and extracting local loss force coefficients along the average flow direction under different working conditions to obtain the distribution of the local loss force coefficients along the flow direction in the impeller mechanical blade channel under different working conditions.
The calculation of the elementary flow field comprises the following steps:
extracting a watershed according to a geometric model of the researched impeller machinery, wherein the extracted watershed comprises an inlet watershed, a turbine blade channel watershed, a pipeline and air cavity watershed; and then, importing the first grid file and the second grid file into a CFX-Pre module of ANSYS CFX software for numerical simulation setting, and obtaining basic flow fields under different working conditions by setting different import and export boundary conditions.
The local rate of change based on entropy s and entropy is calculated as follows:
under directory tree Expression, entropy is calculated according to the following formula
Wherein T is the local temperature and P is the local pressure; t is0、P0Respectively, ambient temperature and pressure as reference temperature and pressure for calculating entropy; cpIs a constant pressure specific heat capacity;
editing a function Encopy for calculating the Entropy value, and then customizing a parameter Entropy s in directory tree Variables, wherein s is associated with the function Encopy for calculating the Entropy value;
the parameter s.gradient is customized in the directory tree Variables, and the local rate of change of entropy is calculated.
The local loss force analysis comprises the following steps:
the local blade force at a certain position in the impeller machinery is decomposed into two parts, namely local loss force and local turning force, wherein the local turning force is perpendicular to the local speed, so that the airflow is deflected; the local loss force is parallel to the local speed, and only entropy increase is generated by reverse work, and the specific expression is as follows:
the scalar expression can be written as:
t is the local temperature, ds represents the local entropy change, FLA local loss of force mode;
according to the definition formula of the speed:
dL is the change in mean flow line, W is the relative velocity of the fluid at the site, i.e. the stator component is absolute;
the scalar expression is rewritten as:
obtaining a relationship between local loss force and a change rate of entropy along the streamline, based on
The local loss force in the turbomachinery blade path is calculated.
Referring to the nigultz tube experiment, the local friction causing flow loss is proportional to the local kinetic energy, and the local loss force causing flow loss in the mechanical vane channel of the impeller is proportional to the local kinetic energy:
FL＝α·W2
alpha is the local loss force coefficient,
in CFX-Post, according to the calculation:
and customizing the local loss force coefficient alpha under a parameter directory tree Variables.
The extraction of the local loss force coefficient on the specific streamline comprises the following processes:
firstly, determining a target three-dimensional Streamline 1 in an impeller mechanical basic flow field, then calculating local loss force coefficients at each point on the target three-dimensional Streamline 1 according to a local loss force coefficient calculation formula, and finally, importing data into drawing software to draw a distribution curve of the local loss force coefficients on a specific Streamline in an impeller mechanical blade channel along the flowing direction.
The extraction of the local loss force coefficient along the average flow direction under different working conditions comprises the following processes:
based on the full three-dimensional flow theory of two types of flow surfaces, n S2 flow surfaces are selected in the impeller mechanical blade channel along the average flow direction, the method of lumped parameter is applied, each physical parameter on the S2 flow surface in the impeller mechanical flow channel is replaced by the average value, namely the flow is simplified into one dimension, the distribution of the local loss force coefficient in the impeller mechanical blade channel along the average flow direction is obtained according to the local loss force coefficient calculation formula,
respectively outputting distribution data of the local loss force coefficients in the impeller mechanical blade channels along the flow direction under different working conditions, and drawing a local loss force coefficient distribution graph in the impeller mechanical blade channels based on the local loss force coefficients of the impeller machinery under different working conditions; the leaf height position is 50% of the leaf height.
The invention provides a system for extracting a local loss force coefficient of an impeller machine, which comprises a flow field calculation module, a local loss force analysis module, a local coefficient extraction module and a local loss force coefficient extraction module;
the flow field calculation module is used for calculating a basic flow field of the impeller mechanical flow field according to the set boundary conditions of the inlet and the outlet of the impeller mechanical flow field to obtain the basic flow field under different working conditions;
the local loss force analysis module is used for calculating the local loss force in the impeller mechanical blade channel according to the relation between the local loss force and the change rate of the entropy along the streamline;
the local coefficient extraction module is used for extracting the local loss force coefficient on the set streamline;
and the local loss force coefficient extraction module is used for extracting local loss force coefficients along the average flow direction under different working conditions to obtain the distribution of the local loss force coefficients in the impeller mechanical blade channel along the flow direction under different working conditions.
The invention also provides computer equipment comprising a processor and a memory, wherein the memory is used for storing a computer executable program, the processor reads the computer executable program from the memory and executes the computer executable program, and the processor can realize the method for extracting the local loss force coefficient of the impeller machinery when executing the computer executable program.
A computer-readable storage medium is also provided, in which a computer program is stored, which, when being executed by a processor, is adapted to carry out the method for extracting a local loss force coefficient of an impeller machine according to the present invention.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention provides a method for extracting the local loss force coefficient of the impeller machinery, which is simple to operate and high in accuracy. Drawing a local loss force coefficient distribution graph on a specific streamline in a blade channel under a certain working condition and a local loss force coefficient distribution graph in a blade channel of the impeller machine under different working conditions, and providing a local loss force coefficient interpolation basis for numerical simulation of internal flow of the impeller machine; in addition, the method for extracting the local loss force coefficient of the impeller machinery, which is provided by the method, is completely suitable for extracting the local loss force coefficient in the impeller machinery blade channel in the surge process, and can provide a local loss force coefficient interpolation basis for numerical research related to impeller machinery surge prediction. Helping to simplify the study of the performance and flow stability problems of turbomachinery, systems coupled with turbomachinery.
Drawings
The present invention will be further described in detail with reference to the accompanying drawings and specific embodiments, taking an axial-centrifugal combined compressor as an example.
Figure 1 shows a meridian flow channel of an axial flow-centrifugal combined compressor studied by the invention.
FIG. 2 shows the distribution of the local loss force on a specific streamline in the flow passage of the axial-flow blade under the design condition extracted by the present invention.
Fig. 3 is a distribution diagram of local loss force coefficients in axial-flow blades, axial-flow stationary blades and centrifugal impeller blade channels of an axial-flow-centrifugal combined compressor extracted by the invention under a typical working condition.
Fig. 4 is a flowchart of the local loss force coefficient extraction method of the present invention.
In the attached drawing, 1 is an axial flow movable blade, 2 is an axial flow stationary blade, 3 is an impeller inlet guide blade, 4 is a centrifugal impeller, and 5 is a radial blade diffuser.
Detailed Description
Referring to the drawings, the present invention comprises the steps of:
a. fundamental flow field calculation
First, basin extraction is performed according to the geometric model of the turbomachinery under study, including the inlet basin, the turbine blade channel basin, the duct and air cavity basins. The method comprises the steps of performing grid division on an inlet flow field, a pipeline and an air cavity flow field in ANSYS ICEM software, performing grid division on an extracted turbine blade channel flow field in IGG automatic grid5 software, then importing the two grid files into a CFX-Pre module of ANSYS CFX software for numerical simulation setting to obtain a corresponding file, importing the file into a Solver CFX-Solver module of the CFX software for constant numerical simulation calculation to obtain a corresponding file. And then, obtaining basic flow fields under different working conditions by setting different inlet and outlet boundary conditions.
In the CFX-Post, user-defined parameters can be set under a parameter directory tree Variables, and a local loss force coefficient is associated with local entropy increase, so that two parameters of the custom entropy s and the local change rate of the entropy (gradient of the entropy) s. Under directory tree Expression, according to the formula:
t is the local temperature and P is the local pressure;
T0、P0respectively, ambient temperature and pressure as reference temperature and pressure for calculating entropy;
Cpthe specific heat capacity is constant pressure.
The function Encopy for calculating the Entropy value is edited, and then the parameter Entropy s is customized in the directory tree Variables and is associated with the function Encopy for calculating the Entropy value.
The parameter s.gradient is customized in the directory tree Variables, and the local rate of change of entropy is calculated.
b. Analysis of local loss force
The local blade force at a certain position in the impeller machinery is decomposed into a local loss force and a local turning force, wherein the local turning force is vertical to the local speed and mainly deflects the airflow; the local loss force is parallel to the local speed, and the reverse and work only produce entropy increase, which can be specifically expressed as:
the scalar expression can be written as:
t is local temperature, ds represents local entropy change, FLIs the local loss of force mode.
According to the definition of speed:
dL is the change in mean flow line, W is the relative velocity of the fluid at the site (stator part is absolute velocity);
the scalar expression can be rewritten as:
the relationship between local loss force and the rate of change of entropy along the streamlines is thus obtained, in CFX-Post, according to:
the local loss force in the turbomachinery blade path is calculated.
Referring to the nigultz tube experiment, the local friction causing flow losses is proportional to the local kinetic energy, and similarly, the local friction causing flow losses in the turbomachinery blade channels is considered to be proportional to the local kinetic energy:
FL＝α·W2
alpha is a local loss force coefficient, and the calculation formula is as follows:
c. extraction of local loss force coefficient on set streamline
See figure 2. First, a target three-dimensional Streamline 1 is determined in the basic flow field of the turbomachinery according to the need of the study. And then, calculating the local loss force coefficient at each point on the target three-dimensional Streamline 1 by applying the local loss force coefficient calculation formula obtained in the step b. And finally, importing the data into drawing software, and drawing a distribution curve of the local loss force coefficient along the flow direction on a specific streamline in the impeller mechanical blade channel.
The specific operation steps in the Post-processing software CFX-Post module are as follows: firstly, under directory tree Insert in CFX-Post software, according to research needs, a Point 1 is created on an inlet surface of a blade channel of an impeller machine, and a three-dimensional Streamline 1 is created in the current blade channel by taking the Point 1 as a starting Point. And then, selecting a Streamline 1 in the CFX-Post, selecting a Streamwise Location and a local loss force coefficient alpha, and outputting the csv file. And finally, importing the data into Origin drawing software, and drawing a distribution curve of the local loss force coefficient along the flow direction on a specific streamline in the passage of the impeller mechanical blade.
d. Extraction of local loss force coefficient along average flow direction under different working conditions
See fig. 3. Based on the full three-dimensional flow theory of two types of flow surfaces, n S2 flow surfaces are selected in the impeller mechanical blade channel along the average flow direction. The method of lumped parameter is applied to replace each physical parameter on the S2 flow surface in the impeller mechanical flow channel by the average value, namely the flow is simplified to one dimension. And c, obtaining the distribution of the local loss force coefficient in the impeller mechanical blade channel along the average flow direction by applying the local loss force coefficient calculation formula obtained in the step b.
The specific operation steps in the Post-processing software CFX-Post module are as follows: under Turbo Charts in a Turbo catalog tree of the rotary machine, a selection object Inlet to Outlet sets a proper leaf height position, a flow direction position is selected on the abscissa, a local loss force coefficient alpha is selected on the ordinate, and the average value of mass flow of the local loss force coefficients from an Inlet to an Outlet at the same flow direction position is obtained. And then, in a data output module Export in the CFX-Post, selecting an Inlet to Outlet Line as a selected position, selecting a stream wise Location and an average value of the local loss force coefficients, and outputting the csv file.
According to the steps, the distribution of the local loss force coefficient in the impeller mechanical blade channel along the average flow direction under different working conditions is output respectively. And (4) importing the local loss force coefficients of the impeller machine under different working conditions into drawing software Origin, and drawing a local loss force coefficient distribution diagram in a blade channel of the impeller machine.
As a preferred technical scheme of the invention, the leaf height position in the step d is 50% of the leaf height.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the invention provides a method for extracting the local loss force coefficient of the impeller machinery, which is simple to operate and high in accuracy. Drawing a local loss force coefficient distribution graph on a specific streamline in a blade channel under a certain working condition and a local loss force coefficient distribution graph in a blade channel of the impeller machine under different working conditions, and providing a local loss force coefficient interpolation basis for numerical simulation of internal flow of the impeller machine; in addition, the method for extracting the local loss force coefficient of the impeller machinery, which is provided by the method, is completely suitable for extracting the local loss force coefficient in the impeller machinery blade channel in the surge process, and can provide a local loss force coefficient interpolation basis for numerical research related to impeller machinery surge prediction. Helping to simplify the study of the performance and flow stability problems of turbomachinery, systems coupled with turbomachinery.
The method for extracting the local loss force coefficient of the impeller machinery disclosed by the invention is completely suitable for extracting the local loss force coefficient in axial-flow type, centrifugal type and axial-flow-centrifugal combined impeller machinery rotor and stator blade channels.
The invention also provides a system for extracting the local loss force coefficient of the impeller machinery, which comprises a flow field calculation module, a local loss force analysis module, a local coefficient extraction module and a local loss force coefficient extraction module;
the flow field calculation module is used for calculating a basic flow field of the impeller mechanical flow field according to the set boundary conditions of the inlet and the outlet of the impeller mechanical flow field to obtain the basic flow field under different working conditions;
the local loss force analysis module is used for calculating the local loss force in the impeller mechanical blade channel according to the relation between the local loss force and the change rate of the entropy along the streamline;
the local coefficient extraction module is used for extracting the local loss force coefficient on the set streamline;
the local loss force coefficient extraction module is used for extracting local loss force coefficients along the average flow direction under different working conditions to obtain the distribution of the local loss force coefficients along the flow direction in the impeller mechanical blade channel under different working conditions.
In addition, the invention may also provide a computer device, which includes a processor and a memory, the memory is used for storing a computer executable program, the processor reads part or all of the computer executable program from the memory and executes the computer executable program, and when the processor executes part or all of the computer executable program, the processor can implement the method for extracting the local loss force coefficient of the impeller machinery.
In another aspect, the present invention provides a computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, is capable of implementing the method for extracting a local loss force coefficient of an impeller machine according to the present invention.
The computer device may be a notebook computer, a desktop computer or a workstation.
The processor may be a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), or an off-the-shelf programmable gate array (FPGA).
The memory of the invention can be an internal storage unit of a notebook computer, a desktop computer or a workstation, such as a memory and a hard disk; external memory units such as removable hard disks, flash memory cards may also be used.
Computer-readable storage media may include computer storage media and communication media. Computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. The computer-readable storage medium may include: read Only Memory (ROM), Random Access Memory (RAM), Solid State Drive (SSD), or optical disc. The Random Access Memory may include a Resistance Random Access Memory (ReRAM) and a Dynamic Random Access Memory (DRAM).
The above description is only presented as an enabling solution for the present invention and should not be taken as a sole limitation on the solution itself.
Claims (10)
1. A method for extracting the mechanical local loss force coefficient of an impeller, comprising the steps of:
a. calculating a basic flow field of the mechanical flow field of the impeller according to the set boundary conditions of the inlet and the outlet of the mechanical flow field of the impeller to obtain the basic flow field under different working conditions;
b. calculating local loss force in a passage of a vane of the impeller machine based on a relation between the local loss force and a change rate of entropy along a streamline in the basic flow field;
c. extracting a local loss force coefficient on a set streamline;
d. and extracting local loss force coefficients along the average flow direction under different working conditions to obtain the distribution of the local loss force coefficients along the flow direction in the impeller mechanical blade channel under different working conditions.
2. The method for extracting the local loss force coefficient of turbomachinery as recited in claim 1, wherein the basic flow field calculation comprises the steps of:
extracting a watershed according to a geometric model of the researched impeller machinery, wherein the extracted watershed comprises an inlet watershed, a turbine blade channel watershed, a pipeline and an air cavity watershed; and then, importing the first grid file and the second grid file into a CFX-Pre module of ANSYS CFX software for numerical simulation setting, and obtaining basic flow fields under different working conditions by setting different inlet and outlet boundary conditions.
3. A method for extracting the local loss force coefficient of an impeller machine according to claim 1, characterized in that the local rate of change based on entropy s and entropy is calculated as follows:
under the Expression of the directory tree, the entropy value is calculated according to the following formula
Wherein T is the local temperature and P is the local pressure; t is0、P0Respectively, ambient temperature and pressure as reference temperature and pressure for calculating entropy; cpIs a constant pressure specific heat capacity;
editing a function Encopy for calculating the Entropy value, and then customizing a parameter Entropy s in directory tree Variables, wherein s is associated with the function Encopy for calculating the Entropy value;
the parameter s.gradient is customized in the directory tree Variables, and the local rate of change of entropy is calculated.
4. A method for extracting the local loss force coefficient of an impeller machine according to claim 3, wherein the local loss force analysis comprises the steps of:
the local blade force at a certain position in the impeller machinery is decomposed into a local loss force and a local turning force, wherein the local turning force is vertical to the local speed, so that the airflow is deflected; the local loss force is parallel to the local speed, and only entropy increase is generated by reverse work, and the specific expression is as follows:
the scalar expression can be written as:
t is the local temperature, ds represents the local entropy change, FLA local loss of force model;
according to the definition of speed:
dL is the change in mean flow line, W is the relative velocity of the fluid at the site, i.e. the stator component is absolute;
the scalar expression is rewritten as:
obtaining a relationship between the local loss force and the change rate of the entropy along the streamline according to
And calculating the local loss force in the passage of the impeller mechanical blade.
5. The method for extracting the local loss force coefficient of the turbomachinery as recited in claim 1, wherein, in reference to the niguerite tube test, the local friction force causing the flow loss is proportional to the local kinetic energy, and the local loss force causing the flow loss in the turbomachinery blade channel is proportional to the local kinetic energy:
FL＝α·W2
alpha is the local loss force coefficient,
in CFX-Post, according to the calculation:
and customizing the local loss force coefficient alpha under a parameter directory tree Variables.
6. A method for extracting the local loss force coefficient of an impeller machine according to claim 1, characterized in that the extraction of the local loss force coefficient on a specific streamline comprises the following processes:
firstly, determining a target three-dimensional Streamline 1 in an impeller mechanical basic flow field, then calculating local loss force coefficients at each point on the target three-dimensional Streamline 1 according to a local loss force coefficient calculation formula, and finally, importing data into drawing software to draw a distribution curve of the local loss force coefficients on a specific Streamline in an impeller mechanical blade channel along the flow direction.
7. Method for extracting the local loss force coefficient of turbomachinery according to claim 1, wherein the extraction of the local loss force coefficient in the mean flow direction under different operating conditions comprises the following steps:
based on the full three-dimensional flow theory of two types of flow surfaces, n S2 flow surfaces are selected in the impeller mechanical blade channel along the average flow direction, the method of lumped parameter is applied, each physical parameter on the S2 flow surface in the impeller mechanical flow channel is replaced by the average value, namely the flow is simplified into one dimension, the distribution of the local loss force coefficient in the impeller mechanical blade channel along the average flow direction is obtained according to the local loss force coefficient calculation formula,
respectively outputting distribution data of local loss force coefficients in the impeller mechanical blade channel along the flow direction under different working conditions, and drawing a local loss force coefficient distribution map in the impeller mechanical blade channel based on the local loss force coefficients of the impeller machinery under different working conditions; the leaf height position is 50% of the leaf height.
8. A system for extracting the local loss force coefficient of an impeller machine is characterized by comprising a flow field calculation module, a local loss force analysis module, a local coefficient extraction module and a local loss force coefficient extraction module;
the flow field calculation module is used for calculating a basic flow field of the impeller mechanical flow field according to the set boundary conditions of the inlet and the outlet of the impeller mechanical flow field to obtain the basic flow field under different working conditions;
the local loss force analysis module is used for calculating the local loss force in the impeller mechanical blade channel according to the relation between the local loss force and the change rate of the entropy along the streamline;
the local coefficient extraction module is used for extracting the local loss force coefficient on the set streamline;
and the local loss force coefficient extraction module is used for extracting local loss force coefficients along the average flow direction under different working conditions to obtain the distribution of the local loss force coefficients in the impeller mechanical blade channel along the flow direction under different working conditions.
9. A computer device, comprising a processor and a memory, wherein the memory is used for storing a computer executable program, the processor reads the computer executable program from the memory and executes the computer executable program, and the processor can implement the method for extracting the local loss force coefficient of the impeller machinery according to any one of claims 1 to 7 when executing the computer executable program.
10. A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, is capable of implementing a method for extracting a local loss force coefficient of an impeller machine according to any one of claims 1 to 7.
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| CN117648780A (en) * | 2024-01-30 | 2024-03-05 | 陕西空天信息技术有限公司 | Parameter optimization method and device for impeller machinery and computer storage medium |
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| CN117648780A (en) * | 2024-01-30 | 2024-03-05 | 陕西空天信息技术有限公司 | Parameter optimization method and device for impeller machinery and computer storage medium |
| CN117648780B (en) * | 2024-01-30 | 2024-05-07 | 陕西空天信息技术有限公司 | Parameter optimization method and device for impeller machinery and computer storage medium |
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