CN104123414A - Parameterization method for optimization of air intake and exhaust channel flow field and heat transfer of pneumatic engine - Google Patents
Parameterization method for optimization of air intake and exhaust channel flow field and heat transfer of pneumatic engine Download PDFInfo
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Abstract
The invention discloses a parameterization method for simulating optimization of the air intake and exhaust channel flow field and heat transfer components of a pneumatic engine based on computational fluid dynamics. The method mainly comprises the steps of establishing a physical three-dimensional structure model and a mathematical model for the developed two-stage pneumatic engine, conducting mesh generation on the established three-dimensional structure graph, conducting numerical simulation on the pneumatic engine models by means of computational fluid dynamics software fluent, and finally, conducting characteristic analysis and calculation on the air intake and exhaust channel flow field of the pneumatic engine and optimizing and improving the air intake and exhaust channel and heat transfer components of the pneumatic engine according to calculation results. According to the method, the CFD idea is introduced to the field of pneumatic engines for the first time, a novel theoretical method and basis are provided for further increasing the energy utilization rate of the pneumatic engines and solving the problems of gas pressure time-varying rule turbulence and gas density unevenness, and a novel idea is provided for study of the pneumatic engines.
Description
Technical field
The invention belongs to simulation calculation application process field, be specifically related to a kind of parametric method to the air motor intake and exhaust channel flow field in power machine field and heat transfer component simulation optimization, here be mainly the two-stage type air motor of developing for newly, it is carried out to the computational analysis of a series of modeling and characteristic, particularly relate to the new analytical approach to the flow field of the gases at high pressure passage of air motor and heat transfer component.
Background technology
In recent years, along with social development and industrialized universal, China's automobile industry accelerates to advance upgrading transition, and with keen determination, the whole industry presents sustainable and healthy development situation.Automobile production and marketing in 2013 has broken through 20,000,000 high pointes, and for the development trend of such, energy problem is extremely urgent, so the development of new-energy automobile is trend of the times.Air motor can be realized zero-emission, and does not use mineral fuel, take pressurized air as acting medium, by the external output power of expansion process of working medium.The working cycle of this engine is a physical process completely, due to not burning, does not also just generate the noxious emission body of conventional engine, realizes the non-pollution discharge of engine completely.In addition, produce pressurized air electric energy used and easily obtain, air dielectric is inexhaustible especially.Visible, using internal combustion engine instead pressurized air is power, can solve well above-mentioned contradiction.
We know, air motor also exists some distinct issues.For example, the power that can be utilized being sent by air motor is lower, and capacity usage ratio is not high, becomes rule disorder and gas density unequal during gaseous tension.If be used on automobile, will inevitably cause the continual mileage of Pneumatic automobile less.So our necessary discovery is this series of problems that solves air motor for a kind of analysis calculation method.Because a lot of places in air motor are all gases at high pressure, thus the problem with regard to having existed gas flowfield and heat to transmit, so this invention is mainly used for addressing these problems.
Flow field and heat for high pressure intake and exhaust channel are transmitted, in conjunction with CFD(computational fluid dynamics), adopt fluent software, complete on computers a kind of method of three-dimensional structure modeling and numerical simulation computational analysis, thereby can analyze the flow field impact that transmission produces mechanism in all cases with heat in some complex mechanisms, as gaseous tension, power, energy utilize situation and density etc. over time on the impact that air motor brought, and then promote the overall performance of air motor.
Summary of the invention
Based on the problems referred to above, the invention provides the parametric method of a kind of software fluent based on computational fluid dynamics to air motor intake and exhaust channel high pressure flow field simulation optimization, that is: combining for solving method and the air motor of fluid and heat transfer aspect, in this patent, the two-stage type air motor of developing liking us of research.This technical method can be studied flow field in the airflow line in air motor and real-time condition and the impact of gases at high pressure on uniform stressed in system of pressure effectively, for further improving the low and energy of the power of air motor, utilizes that utilization factor is not high provides a kind of new method.
The present invention is that the technical scheme that adopts of technical solution problem is as follows:
The parametric method that a kind of air motor intake and exhaust channel flow field and heat transmission are optimized, it is characterized in that: by air motor is set up to computational fluid dynamics model, the foundation of the software fluent of utilization based on Computational Fluid Dynamics to air motor governing equation and boundary condition, the flow field of air motor intake and exhaust channel and heat transfer parameter are carried out simulation optimization, improve air motor intake and exhaust channel internal pressure, capacity usage ratio and gas homogeneity, thereby improve the mechanical efficiency of air motor in practice, mainly comprise the following steps:
A): 3 d structure model is set up: utilize catia and autoCAD overall design also specifically to draw the concrete model of air motor;
B): Mathematical Models: the condition of first determining the constituent mass conservation equation of mass-conservation equation, momentum conservation equation, energy conservation equation and total system and part system according to the specific works state of air motor, described condition is determined as follows: the air-flow of (1) supposition air motor high-pressure air pipe channel interior is viscosity, Newtonian fluid, and be compressible, mobile mode is UNSTEADY FLOW, and considers the energy that viscous force dissipated in the course of the work; (2) supposition is in air motor, and the flow state of air-flow is turbulent flow, and the mutual blending of fluid particle, moves unordered, and motion key element has randomness, meets Boussinesq hypothesis; (3) research object is the gases at high pressure passage gas in air motor and the parts that heat is transmitted occurs, thereby fundamental equation is Reynolds equation, and turbulence model adopts k-two-equation model;
C): air motor model is carried out to grid division: after air motor three-dimension modeling, three-dimensional plot is imported in Gambit software or mesh module, ICEM, the pointwise of workbench the inside carry out computing grid division, because the gas pipeline of the intake and exhaust of air motor is all arbitrary shape, irregular structure, so can adopt non-structured grid; Grid can adopt tetrahedron or hexahedron form etc., and then in gambit software, automatically mixes applicable boundary condition;
D): carry out the analysis based on fluent: enter after fluent software the first step: the grid about air motor of previously drawing is shown to Define → models → slover; Second step: set up solving model: select solver → standard k-turbulence model is set, Define → models selects k-epsilon turbulence model in models list, can open viscous models dialog box after choosing model automatically; In above-mentioned, select energy equation, activate heat transfer mechanism Define → models → energy; The 3rd step: the physical attribute that fluid in air motor is set; The 4th step: determine boundary condition, set gradually the boundary condition of fluid and main-inlet; The 5th step: solve based on above-mentioned preparation, then in fluent software, draw out the characteristic curve diagram of temperature field pattern, pressure field pattern, Turbulent Kinetic figure and intensity map about air motor, and then utilize situation to carry out specificity analysis to the real-time pressure of air motor and energy, draw related conclusions.
The present invention is by setting up computational fluid dynamics model, utilize CFD software fluent to carry out simulation optimization to air motor intake and exhaust channel flow field and heat transfer component, for further promoting the capacity usage ratio of air motor, become rule disorder while improving gaseous tension and the unequal problem of gas density provides a kind of new theoretical foundation.Also for air motor research provides a kind of new thinking.
Accompanying drawing explanation
Fig. 1 is the physical model figure of two-stage type air-powered motor body used in the present invention;
Fig. 2 the present invention is based on the specific design schematic flow sheet of fluent software to the parametric method of the two-stage cylinder of two-stage type air motor and high-pressure copper pipe simulation optimization.
Embodiment
For technological means, the method for this invention narration clearly being understood by technician and it being used in to the rear conclusion that can draw on air motor, at this, in conjunction with diagram and above-mentioned concrete steps, be further elaborated again.First be ready work in the computing machine that will use at it, install exceed, gambit software and fluent software.
The physical model figure of two-stage type air-powered motor body used in the present invention as shown in Figure 1;
Be illustrated in figure 2 parametrization process flow diagram, the parametric method that a kind of air motor intake and exhaust channel flow field and heat transmission are optimized, by air motor is set up to computational fluid dynamics model, the software fluent of utilization based on Computational Fluid Dynamics carries out simulation optimization to the flow field of air motor intake and exhaust channel and heat transfer parameter, improve air motor intake and exhaust channel internal pressure, capacity usage ratio and gas homogeneity, thereby improve the mechanical efficiency of air motor in practice, comprise the following steps:
A): 3 d structure model is set up: utilize catia and autoCAD overall design also specifically to draw the concrete model of air motor;
B): Mathematical Models: the condition of first determining the constituent mass conservation equation of mass-conservation equation, momentum conservation equation, energy conservation equation and total system and part system according to the specific works state of air motor, described condition is determined as follows: the air-flow of (1) supposition air motor high-pressure air pipe channel interior is viscosity, Newtonian fluid, and be compressible, mobile mode is UNSTEADY FLOW, and considers the energy that viscous force dissipated in the course of the work; (2) supposition is in air motor, and the flow state of air-flow is turbulent flow, and the mutual blending of fluid particle, moves unordered, and motion key element has randomness, meets Boussinesq hypothesis; (3) research object is the gases at high pressure passage in air motor and the parts that heat is transmitted occurs, thereby fundamental equation is Reynolds equation, and turbulence model adopts k-two-equation model;
C): air motor model is carried out to grid division: after air motor three-dimension modeling, three-dimensional plot is imported in Gambit software or mesh module, ICEM, the pointwise of workbench the inside carry out computing grid division, because the gas pipeline of the intake and exhaust of air motor is all arbitrary shape, irregular structure, so can adopt non-structured grid; Grid can adopt tetrahedron or hexahedron form etc., and then in gambit software, automatically mixes applicable boundary condition;
D): carry out the analysis based on fluent: enter after fluent software the first step: the grid about air motor of previously drawing is shown to Define → models → slover; Second step: set up solving model: select solver → standard k-turbulence model is set, Define → models selects k-epsilon turbulence model in models list, can open viscous models dialog box after choosing model automatically; In above-mentioned, select energy equation, activate heat transfer mechanism Define → models → energy; The 3rd step: the physical attribute that fluid in air motor is set; The 4th step: determine boundary condition, set gradually the boundary condition of fluid and main-inlet; The 5th step: solve based on above-mentioned preparation, then in fluent software, draw out the characteristic curve diagram of temperature field pattern, pressure field pattern, Turbulent Kinetic figure and intensity map about air motor, and then utilize situation to carry out specificity analysis to the real-time pressure of air motor and energy, draw related conclusions.
In the foundation of mathematical model, must note choosing of various conditions: determine that the high pressure draught in each the intake and exhaust high pressure draught passage that will study of air motor is viscosity, Newtonian fluid, is compressible, mobile mode is UNSTEADY FLOW, in calculating, to understand fully utilization and the dissipation of energy, i.e. dissipation energy; In addition, in air motor, the flow state of air-flow is turbulent flow, and the mutual blending of fluid particle, moves unordered, and motion key element has randomness, meets Boussinesq hypothesis; Be exactly in addition, research object is intake and exhaust high pressure draught passage and heat transfer component, thereby we can determine that its fundamental equation is Reynolds equation, and turbulence model adopts k-two-equation model.Based on above-mentioned all preparations, finally in fluent, carry out calculating and specificity analysis and draw accordingly result, and then analyzing the in good time situation of its pressure and energy.
Next, in conjunction with said method, for the high-pressure copper pipe between the two-stage cylinder in air motor and series connection two cylinders, carry out simple interpretation of result.Cylinder and copper pipe are the cores of air motor, when gases at high pressure enter after the expansion of one-level cylinder has been done work, by copper pipe, arrive secondary cylinder continuation expansion acting, and purpose of design is exactly in order to increase output power like this.Yet, if the structural design of this mini system is bad, can directly affect the effect of air motor two-stage.
Now two-stage cylinder and copper pipe are analyzed based on fluent method.Due to the continuity requirement in motion flow field, between piston and cylinder, can produce very large pressure drop, so the pressure result that the structure size of cylinder produces it is of crucial importance.After cylinder modeling and grid division, sunykatuib analysis in fluent, after optimizing and in conjunction with the specific requirement designing, by analysis result, can be obtained: when the diameter of firsts and seconds cylinder is respectively 70mm and 78mm, Pressure Drop between two pistons and cylinder relatively evenly, stable, thereby the pressure producing is also more constant, will be good than development expection requirement many.
Secondly, diameter and the length of middle copper pipe passage are larger on the impact of the die swell ratio of air motor and pressure fluctuation amplitude, known by said method result, when copper pipe diameter is that 13mm, length are while being 355 mm, it is minimum that expansion finishes the rear pressure loss, improved the efficiency expanding, under this structure, also made the ripple amplitude of pressure reduce some.
In addition, change modeling from turbulence intensity is analyzed, the place that when piston has just started to rotate, turbulence intensity is large mainly concentrates on the position of secondary cylinder air intake opening. along with the continuous inflow of fluid in one-level cylinder, make the turbulence intensity in this chamber will obviously be greater than one-level cylinder, the turbulence effects of two cylinders now obtains a kind of mobile equilibrium very soon, relatively stable thereby fluid flows.
Claims (1)
1. the parametric method that an air motor intake and exhaust channel flow field and hot transmission are optimized, it is characterized in that: by air motor is set up to computational fluid dynamics model, the software fluent of utilization based on Computational Fluid Dynamics carries out simulation optimization to the flow field of air motor intake and exhaust channel and heat transfer parameter, improve air motor intake and exhaust channel internal pressure, capacity usage ratio and gas homogeneity, thereby improve the mechanical efficiency of air motor in practice, mainly comprise the following steps:
A): 3 d structure model is set up: utilize catia and autoCAD overall design also specifically to draw the concrete model of air motor;
B): Mathematical Models: the condition of first determining the constituent mass conservation equation of mass-conservation equation, momentum conservation equation, energy conservation equation and total system and part system according to the specific works state of air motor, described condition is determined as follows: the air-flow of (1) supposition air motor high-pressure air pipe channel interior is viscosity, Newtonian fluid, and be compressible, mobile mode is UNSTEADY FLOW, and considers the energy that viscous force dissipated in the course of the work; (2) supposition is in air motor, and the flow state of air-flow is turbulent flow, and the mutual blending of fluid particle, moves unordered, and motion key element has randomness, meets Boussinesq hypothesis; (3) research object is the gases at high pressure passage in air motor and the parts that heat is transmitted occurs, thereby fundamental equation is Reynolds equation, and turbulence model adopts k-two-equation model;
C): air motor model is carried out to grid division: after air motor three-dimension modeling, three-dimensional plot is imported in Gambit software or mesh module, ICEM, the pointwise of workbench the inside carry out computing grid division, because the gas pipeline of the intake and exhaust of air motor is all arbitrary shape, irregular structure, so can adopt non-structured grid; Grid can adopt tetrahedron or hexahedron form etc., and then in gambit software, automatically mixes applicable boundary condition;
D): carry out the analysis based on fluent: enter after fluent software the first step: the grid about air motor of previously drawing is shown to Define → models → slover; Second step: set up solving model: select solver → standard k-turbulence model is set, Define → models selects k-epsilon turbulence model in models list, can open viscous models dialog box after choosing model automatically; In above-mentioned, select energy equation, activate heat transfer mechanism Define → models → energy; The 3rd step: the physical attribute that fluid in air motor is set; The 4th step: determine boundary condition, set gradually the boundary condition of fluid and main-inlet; The 5th step: solve based on above-mentioned preparation, then in fluent software, draw out the characteristic curve diagram of temperature field pattern, pressure field pattern, Turbulent Kinetic figure and intensity map about air motor, and then utilize situation to carry out specificity analysis to the real-time pressure of air motor and energy, draw related conclusions.
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Cited By (8)
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| CN105373674A (en) * | 2015-12-07 | 2016-03-02 | 大族激光科技产业集团股份有限公司 | Method and device for optimizing inner cavity structure of protective glass |
| CN107247823A (en) * | 2017-05-12 | 2017-10-13 | 北京环境特性研究所 | Bright eruption flow field predictor method based on accurate one-dimensional chemical dynamics process and self moulding |
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- 2014-07-19 CN CN201410345740.9A patent/CN104123414A/en active Pending
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| CN105373674A (en) * | 2015-12-07 | 2016-03-02 | 大族激光科技产业集团股份有限公司 | Method and device for optimizing inner cavity structure of protective glass |
| CN105373674B (en) * | 2015-12-07 | 2018-11-13 | 大族激光科技产业集团股份有限公司 | Protective glass inner-cavity structure optimization method and device |
| CN107491572A (en) * | 2016-08-17 | 2017-12-19 | 宝沃汽车（中国）有限公司 | Fluid emulation computational methods in a kind of cylinder |
| CN107247823A (en) * | 2017-05-12 | 2017-10-13 | 北京环境特性研究所 | Bright eruption flow field predictor method based on accurate one-dimensional chemical dynamics process and self moulding |
| CN107247823B (en) * | 2017-05-12 | 2020-08-18 | 北京环境特性研究所 | Flame flow field estimation method based on quasi-one-dimensional chemical dynamics process and self-modulus |
| CN107346353A (en) * | 2017-06-05 | 2017-11-14 | 民政部零研究所 | A kind of solid burning article combustion process emulation mode and server |
| CN107346353B (en) * | 2017-06-05 | 2020-07-03 | 民政部一零一研究所 | Solid comburent combustion process simulation method and server |
| CN108133079A (en) * | 2017-12-01 | 2018-06-08 | 上海理工大学 | Field of turbulent flow coherent structure extracting method in IC engine cylinder |
| CN108536922A (en) * | 2018-03-20 | 2018-09-14 | 北京航空航天大学 | The internal and external flow field integration method for numerical simulation of aircraft and engine |
| CN110705013A (en) * | 2019-08-22 | 2020-01-17 | 蓝箭航天空间科技股份有限公司 | Simulation method for liquid methane autogenous pressurizing conveying system |
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Application publication date: 20141029 |