CN113378496A - Engineering machinery and method for calculating inlet and outlet temperatures of radiator of engineering machinery - Google Patents
Engineering machinery and method for calculating inlet and outlet temperatures of radiator of engineering machinery Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000004364 calculation method Methods 0.000 claims abstract description 31
- 238000001816 cooling Methods 0.000 claims abstract description 20
- 230000002528 anti-freeze Effects 0.000 claims description 10
- 239000010720 hydraulic oil Substances 0.000 claims description 10
- 239000000295 fuel oil Substances 0.000 claims description 9
- 239000003921 oil Substances 0.000 claims description 8
- 238000002474 experimental method Methods 0.000 claims description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
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- 230000017525 heat dissipation Effects 0.000 description 1
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- G06F2119/08—Thermal analysis or thermal optimisation
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Abstract
The invention provides an engineering machine and a method for calculating the temperature of an inlet and an outlet of a radiator of the engineering machine, wherein the method comprises the following steps: step S10: establishing a three-dimensional model of an engine compartment; step S20: obtaining the resistance loss proportion of the airflow after flowing through the engine cabin according to the three-dimensional model of the engine cabin; step S30: establishing a one-dimensional model of the cooling system; step S40: and introducing the resistance loss value into the one-dimensional model, and obtaining the air inlet temperature and/or the air outlet temperature of the radiator in the cooling system according to the parameters corrected by the one-dimensional model. In the calculation method, the influence of the resistance of the engine room on the air volume of the fan is considered, and the influence of the whole cooling circulation system where the radiator is located is also considered, so that the calculation method is more reasonable, and the calculation error of the inlet and outlet temperatures of the radiator can be reduced.
Description
Technical Field
The invention relates to the technical field of temperature control of heat dissipation equipment, in particular to engineering machinery and a method for calculating the temperature of an inlet and an outlet of a radiator of the engineering machinery.
Background
Excavators are common work machines. At present, two methods are generally adopted for calculating the temperature of an inlet and an outlet of a radiator of an excavator: one is to adopt a three-dimensional radiator model for calculation, wrap the radiator model by an air domain, and independently calculate the inlet and outlet temperature of each radiator; and the other is to adopt one-dimensional simulation software to build a cooling system, and the inlet and outlet temperatures of all radiators can be obtained through simultaneous calculation.
But in both of the above methods: the three-dimensional model is adopted to directly calculate the inlet and outlet temperatures of the radiators, the sizes of the radiators and the fans need to be optimized, the calculation time is long, the mutual influence of the radiators in the whole cooling circulation system is not considered, the inlet and outlet temperatures of each radiator are calculated independently, and large deviation exists. The one-dimensional radiator module is adopted to calculate the temperature of the inlet and the outlet of the radiator, and the influence of the resistance of the engine room on the air quantity of the fan is not considered, so that the error of the calculation result is large. Therefore, the method for calculating the temperature of the inlet and the outlet of the radiator of the excavator in the prior art has the defect of inaccuracy.
Disclosure of Invention
The invention provides engineering machinery and a method for calculating the temperature of an inlet and an outlet of a radiator of the engineering machinery.
In order to solve the above problem, the present invention provides a method for calculating a temperature of an inlet/outlet of a radiator of an engineering machine, including: step S10: establishing a three-dimensional model of an engine compartment; step S20: obtaining the resistance loss proportion of the airflow after flowing through the engine cabin according to the three-dimensional model of the engine cabin; step S30: establishing a one-dimensional model of the cooling system; step S40: and introducing the resistance loss value into the one-dimensional model, and obtaining the inlet temperature and/or the outlet temperature of the radiator in the cooling system according to the parameters corrected by the one-dimensional model.
Optionally, step S10 includes: establishing a geometric model of the following components: the engine, hydraulic pump, radiator, fan, wind scooper, air cleaner and engine compartment plate.
Optionally, the heat sink comprises one or more of the following components: the system comprises a hydraulic oil radiator, an antifreeze radiator, a fuel oil radiator, a pitch-variable oil radiator, an intercooler and a condenser.
Optionally, step S20 includes: step S21: obtaining a first pressure difference across the fan and obtaining a second pressure difference across the heat sink; step S22: calculating a difference between the first pressure differential and the second pressure differential; step S23: and calculating the ratio of the difference to the first pressure difference to obtain the resistance loss ratio.
Alternatively, the second pressure differential is obtained by a pressure differential experiment.
Optionally, step S30 includes: inputting an experimental value of flow-temperature change of the radiator and an experimental value of flow-pressure difference of the radiator; inputting a rotating speed curve of the fan.
Optionally, step S30 further includes: the parameters of the medium in the radiator are input.
Optionally, step S40 includes: and correcting the wind speed value of the fan according to the resistance loss proportion.
Optionally, the heat sink comprises one or more of the following components: the system comprises a hydraulic oil radiator, an antifreeze radiator, a fuel oil radiator, a pitch-variable oil radiator, an intercooler and a condenser.
The invention also provides engineering machinery comprising the radiator, and the inlet and outlet temperatures of the radiator are calculated by the calculating method.
The invention has the following advantages:
by utilizing the technical scheme of the invention, the calculation method of the temperature of the inlet and the outlet of the radiator adopts a mode of combining a three-dimensional model and a one-dimensional model. The resistance loss after the airflow passes through the engine compartment is calculated through the three-dimensional model of the engine compartment, and the loss data is imported into the one-dimensional model of the refrigerating system. And (3) considering the influence of the radiator in the cooling system in the one-dimensional model, and finally calculating the temperature values of the inlet and the outlet of the radiator. In the calculation method, the influence of the resistance of the engine room on the air volume of the fan is considered, and the influence of the whole cooling circulation system where the radiator is located is also considered, so that the calculation method is more reasonable, and the calculation error of the inlet and outlet temperatures of the radiator can be reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flow chart illustrating a method for calculating the temperature of the inlet and outlet of the engineering machine and the radiator thereof according to the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the method for calculating the radiator inlet/outlet temperature of the construction machine according to the present embodiment includes:
step S10: establishing a three-dimensional model of an engine compartment;
step S20: obtaining the resistance loss proportion of the airflow after flowing through the engine cabin according to the three-dimensional model of the engine cabin;
step S30: establishing a one-dimensional model of the cooling system;
step S40: and introducing the resistance loss proportion into the one-dimensional model, and obtaining the inlet temperature and/or the outlet temperature of the radiator in the cooling system according to the parameters corrected by the one-dimensional model.
By using the technical scheme of the embodiment, the calculation method of the temperature of the inlet and the outlet of the radiator adopts a mode of combining a three-dimensional model and a one-dimensional model. The resistance loss after the airflow passes through the engine compartment is calculated through the three-dimensional model of the engine compartment, and the loss data is imported into the one-dimensional model of the refrigerating system. And (3) considering the influence of the radiator in the cooling system in the one-dimensional model, and finally calculating the temperature values of the inlet and the outlet of the radiator. In the above calculation method, the influence of the engine compartment resistance on the fan air volume is considered, and the influence of the whole cooling circulation system where the radiator is located is also considered, so the calculation method of the embodiment is more reasonable, and the calculation error of the inlet and outlet temperature of the radiator can be reduced.
It should be noted that the "inlet temperature" and "outlet temperature" of the powder box of the heat sink refer to the temperatures of the medium inside the heat sink at the inlet and outlet. The medium is different according to the type of the radiator, for example, the medium can be hydraulic oil, fuel oil, antifreeze solution, etc.
In step S10, the three-dimensional model of the engine compartment is created using three-dimensional software. Specifically, in this embodiment, a three-dimensional simulation module Star CCM + is used to establish a geometric model according to the dimensions of the outer shell of the engine compartment of the excavator and the internal components thereof. Of course, other conventional three-dimensional software may be used by those skilled in the art to create a three-dimensional model of the engine compartment.
Further, step S10 includes: establishing a geometric model of the following components:
the engine, hydraulic pump, radiator, fan, wind scooper, air cleaner and engine compartment plate.
Specifically, the engine, hydraulic pump, radiator, fan, wind scooper and air cleaner are all located within the engine compartment panel. According to the specific dimensions of the above components, a corresponding geometric model is established in the Star CCM + software.
Preferably, when the geometric model is established, the part meshing is divided by adopting a polyhedral mesh. Compared with the traditional tetrahedral and hexahedral meshes, the polyhedral mesh has a plurality of adjacent units, so that the node gradient and the flow distribution can be calculated more reasonably, and in addition, the polyhedral mesh has stronger adaptability and balance on the generation and calculation efficiency of the part mesh with the complex appearance of the engine compartment.
In addition, step S10 includes creating a box around the periphery of the engine compartment and simulating an air space around the periphery of the engine compartment. Through the geometric model and the air domain model of each part, the resistance loss ratio of the airflow after passing through the engine compartment can be calculated subsequently.
Further, when the geometric model is built for the fan in step S10, in order to minimize the calculation error of the fan air volume, a cylinder is built around the fan, the fan is wrapped, the minimum distance between each surface of the cylinder and the fan cannot be greater than 2mm, and then the whole cylinder area is set as the rotation area.
In the present embodiment, the heat sink includes the following six components: the system comprises a hydraulic oil radiator, an antifreeze radiator, a fuel oil radiator, a pitch-variable oil radiator, an intercooler and a condenser. Specifically, in step S10, it is necessary to establish a geometric model for each of the hydraulic oil radiator, the antifreeze radiator, the fuel oil radiator, the variable pitch oil radiator, the intercooler, and the condenser. Of course, the heat sink may include only some or one of the six components, depending on the type and structure of the excavator.
In the technical solution of this embodiment, step S20 includes:
step S21: obtaining a first pressure difference across the fan and obtaining a second pressure difference across the heat sink;
step S22: calculating a difference between the first pressure differential and the second pressure differential;
step S23: and calculating the ratio of the difference to the first pressure difference to obtain the resistance loss ratio.
Specifically, in step S20, the first pressure difference between the two ends of the fan, the airflow pressure generated by the fan, and the second pressure difference between the two ends of the heat sink, that is, the resistance to the airflow after passing through the heat sink, are obtained. The difference value between the first pressure difference and the second pressure difference is the pressure of the air flow generated by the fan after passing through the radiator. And calculating the ratio of the difference to the first pressure difference to obtain the proportion of the resistance loss of the airflow generated by the fan.
Furthermore, the blocking data of each part to the airflow of the fan can be calculated according to the air domain model and the engine compartment model, so that the first pressure difference between the two ends of the fan can be calculated.
Further, for the second pressure difference, since the heat sink is a plate-fin heat sink, a large number of wavy fins exist between fins of the heat sink, and the thickness of the fins is very thin, which results in a very large amount of grids and even an inability to calculate the grid number. To solve the problem, the resistance generated by the fins between the plate fins is deduced through experimental data of the flow pressure difference of the radiator, and the resistance is loaded into a three-dimensional model to be equivalent to the resistance of the plate fins.
It should be noted that, in the present embodiment, since the radiator includes six components (a hydraulic oil radiator, an antifreeze radiator, a fuel oil radiator, a variable pitch oil radiator, an intercooler, and a condenser), it is necessary to obtain the second pressure differences at both ends of the six radiator components, respectively, and calculate the sum of the six second pressure differences.
Therefore, the steps S10 and S20 described above complete the data of the pressure loss ratio after the airflow passes through the engine compartment by the three-dimensional model.
In the technical solution of this embodiment, step S30 includes:
inputting an experimental value of flow-temperature change of the radiator and an experimental value of flow-pressure difference of the radiator; inputting a rotating speed curve of the fan.
Specifically, step S30 is to build a model of the cooling system, mainly through a one-dimensional simulation module. Specifically, KULI software is used in the present embodiment to model the cooling system, and experimental data of the radiator and the fan are input to the software. The experimental data mainly include: experimental values of flow-temperature variation input to the radiator, experimental values of flow-pressure difference input to the radiator, and a rotation speed curve input to the fan. Meanwhile, the pressure loss ratio data obtained through the above steps S10 and S20 is loaded into the one-dimensional model as an engine compartment resistance module.
Of course, other common one-dimensional simulation software may be used by those skilled in the art to create a one-dimensional model of the cooling system.
Further, step S30 further includes:
the parameters of the medium in the radiator are input.
Specifically, the medium in the radiator differs depending on the type of the radiator, and the medium is, for example, antifreeze or hydraulic oil. Parameters of the medium include density, specific heat capacity, heat transfer coefficient, kinematic viscosity at different temperatures.
In the present embodiment, step S40 includes:
and correcting the wind speed value of the fan according to the resistance loss proportion.
Specifically, in step S40, the numerical value of the wind speed of the fan is adjusted by the resistance loss ratio obtained in steps S10 and S20, and the influence of the nacelle resistance on the fan airflow is sufficiently considered. After the wind speed value of the fan is corrected, the inlet and outlet temperature values of the radiator are calculated by utilizing KULI software, and the influence of the whole cooling circulation system where the radiator is located is comprehensively considered.
Further, as described above, the radiator in the present embodiment includes a hydraulic oil radiator, an antifreeze radiator, a fuel oil radiator, a variable pitch oil radiator, an intercooler, and a condenser. Therefore, the inlet and outlet temperatures of the six components need to be calculated respectively during calculation. Of course, the person skilled in the art may also calculate the inlet/outlet temperature of one or more of the above components according to the actual working requirement.
Meanwhile, as can be seen from the above steps S10 to S40, the method of the present embodiment only needs to calculate the engine compartment air duct flow field once to obtain the engine compartment resistance loss ratio, and can quickly and conveniently obtain the inlet and outlet temperatures of each radiator through the one-dimensional module, and can also obtain the air volume of each radiator and the inlet and outlet air temperatures, and can quickly obtain the result even if the specifications of each radiator and the fan are changed.
The embodiment also provides the engineering machinery, the engineering machinery comprises a radiator, and the temperature of the inlet and the outlet of the radiator is calculated by the calculating method. Preferably, the engineering machine is an excavator, and of course, other engineering machines provided with a radiator, such as a crane, a pump truck and the like, may use the above calculation method to calculate the inlet/outlet temperature of the radiator.
According to the above description, the present patent application has the following advantages:
1. the modeling of the radiator and the fan is optimized, the air channel flow field of the engine compartment does not need to be recalculated, the calculation time is reduced, and the calculation efficiency is improved;
2. according to the method, the influence of the resistance of the engine room on the air quantity of the fan is considered, the influence of the whole cooling circulation system where the radiator is located is also considered, the calculation error is reduced, and the calculation is more reasonable.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A method for calculating the temperature of an inlet and an outlet of a radiator of engineering machinery is characterized by comprising the following steps:
step S10: establishing a three-dimensional model of an engine compartment;
step S20: obtaining the resistance loss proportion of the airflow after flowing through the engine cabin according to the three-dimensional model of the engine cabin;
step S30: establishing a one-dimensional model of the cooling system;
step S40: and introducing the resistance loss value into the one-dimensional model, and obtaining the inlet temperature and/or the outlet temperature of the radiator in the cooling system according to the parameters corrected by the one-dimensional model.
2. The computing method according to claim 1, wherein the step S10 includes:
establishing a geometric model of the following components:
the engine, hydraulic pump, radiator, fan, wind scooper, air cleaner and engine compartment plate.
3. The computing method of claim 2, wherein the heat sink comprises one or more of:
the system comprises a hydraulic oil radiator, an antifreeze radiator, a fuel oil radiator, a pitch-variable oil radiator, an intercooler and a condenser.
4. The computing method according to claim 2, wherein the step S20 includes:
step S21: obtaining a first pressure difference across the fan and obtaining a second pressure difference across the heat sink;
step S22: calculating a difference between the first and second pressure differentials;
step S23: calculating a ratio of the difference to the first pressure difference to obtain the resistance loss ratio.
5. The method of claim 4, wherein the second pressure differential is obtained by a pressure differential experiment.
6. The computing method according to claim 1, wherein the step S30 includes:
inputting an experimental value of flow-temperature change of the radiator and an experimental value of flow-pressure difference of the radiator;
inputting a rotating speed curve of the fan.
7. The computing method according to claim 6, wherein the step S30 further includes:
the parameters of the medium in the radiator are input.
8. The computing method according to claim 6 or 7, wherein the step S40 includes:
and correcting the wind speed value of the fan according to the resistance loss proportion.
9. The computing method of claim 6 or 7, wherein the heat sink comprises one or more of:
the system comprises a hydraulic oil radiator, an antifreeze radiator, a fuel oil radiator, a pitch-variable oil radiator, an intercooler and a condenser.
10. A working machine comprising a radiator, characterized in that the inlet-outlet temperature of the radiator is calculated by the calculation method according to any one of claims 1 to 9.
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| CN114776434A (en) * | 2022-03-23 | 2022-07-22 | 东风汽车集团股份有限公司 | Engine radiator outlet water temperature estimation method |
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| CN114776434B (en) * | 2022-03-23 | 2023-11-24 | 东风汽车集团股份有限公司 | Engine radiator outlet water temperature prediction method |
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