CN109117519B - Method for simulating transient temperature field of oil tank structure - Google Patents
Method for simulating transient temperature field of oil tank structure Download PDFInfo
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- CN109117519B CN109117519B CN201810807247.2A CN201810807247A CN109117519B CN 109117519 B CN109117519 B CN 109117519B CN 201810807247 A CN201810807247 A CN 201810807247A CN 109117519 B CN109117519 B CN 109117519B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
Abstract
A simulation method of a transient temperature field of an oil tank structure comprises the following steps of firstly, establishing an oil tank structure model; secondly, simplifying the fuel oil and the air in the fuel tank structure into a plurality of mass units, and dividing the fuel oil and the air into a plurality of layers in the vertical spatial direction through analyzing the fuel oil consumption process, wherein each layer comprises a fuel oil mass unit and an air mass unit; then establishing a convection heat exchange unit among the fuel quality unit, the air quality unit and the oil tank structure model; and finally, simulating the consumption and inflow process of the fuel oil in the oil tank by using a life and death unit method and controlling the life and death of the fuel oil quality unit, the air quality unit and the convection heat exchange unit.
Description
Technical Field
The invention relates to the design technology of an aircraft fuel tank structure, in particular to a method for simulating a transient temperature field of a fuel tank structure.
Background
The hypersonic aircraft fuel tank structure causes thermal deformation of the fuel tank structure under the action of thermal load, and thermal stress is generated because the internal parts are mutually constrained and free expansion or contraction cannot be realized. In the partial regions of severe temperature changes, the thermal stresses are even of the same order of magnitude as the mechanical stresses, which has a significant adverse effect on the functional use and the structural safety of the tank structure. Therefore, the temperature of the hypersonic vehicle must be strictly controlled.
The existing CFD fluid analysis method has higher accuracy of analyzing the temperature field of the fluid, but has long analysis period and low efficiency when analyzing the change process of the fluid; the analysis speed of the heat grid method is high, but the structure is simplified too much, and the temperature field distribution of the oil tank structure cannot be obtained.
Disclosure of Invention
The invention aims to provide a method for simulating a transient temperature field of a fuel tank structure, which is used for quickly and efficiently simulating a temperature field of a fuel tank in the fuel consumption or inflow process of a hypersonic aircraft.
The technical scheme of the invention is as follows:
a method for simulating a transient temperature field of a fuel tank structure comprises the following steps:
and 4, simulating the consumption process of the fuel in the oil tank by applying a life and death unit method and controlling the life and death of the fuel quality unit, the air quality unit and the convection heat exchange unit.
Preferably, the number of fuel splits is determined in step 1.2 according to the rate of fuel consumption.
Preferably, the specific steps of the fuel oil and air quality control unit and the convective heat exchange unit in the step 1.4 are
And when one layer of fuel is consumed, killing the fuel quality unit of the layer, killing the convective heat exchange unit related to the fuel quality unit and the air quality unit of the upper layer, activating the air quality unit of the layer and the fuel quality unit of the next layer, and activating the convective heat exchange unit related to the air quality unit of the layer.
The invention has the following effects:
according to the method for simulating the transient temperature field of the oil tank structure, the fuel quality unit and the air quality unit are divided into a plurality of layers in the vertical direction, and the life and death of the fuel quality unit and the air quality unit and the convection heat exchange unit are controlled by applying a life and death unit method, so that the consumption and inflow processes of fuel in an oil tank are simulated.
Drawings
FIG. 1 is a schematic diagram of the heat exchange of a fuel tank model of the present invention;
FIG. 2 is a schematic view of the convective heat transfer of the air mass unit and the fuel mass unit of the present invention.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the 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. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, and 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 therefore, should not be taken as limiting the scope of the present invention.
The method for simulating the transient temperature field of the fuel tank structure according to the present invention is further described in detail with reference to fig. 1 and 2.
The invention provides a method for simulating a transient temperature field of an oil tank structure, which comprises the following steps:
the first step is to establish a fuel tank structure model (4) according to the parameters of the fuel tank such as size, shape, thickness and material and combining with load analysis.
And the second step is to simplify the fuel oil and the air in the oil tank structure into a plurality of lumped-parameter mass units, and divide the fuel oil consumption speed and the air fuel oil consumption speed into a plurality of layers in the vertical direction through analyzing the fuel oil consumption process, wherein each layer comprises a fuel oil mass unit (1) and an air mass unit (2).
And thirdly, establishing a heat convection unit (3) among the fuel quality unit (1), the air quality unit (2) and the oil tank structure model (4) according to the distribution condition of the fuel quality unit (1) and the air quality unit (2), wherein the heat convection unit (3) among the fuel quality unit (1) and the air quality unit (2), the heat convection unit (3) among the fuel quality unit (1) and the oil tank structure model (4) and the heat convection unit (3) among the air quality unit (2) and the oil tank structure model (4) are included, and the heat exchange coefficient of the heat convection unit (3) is set. The heat exchange process of the fuel tank structure model (4) is shown in figure 1, and the schematic structures of the air quality unit (2), the fuel quality unit (1) and the convection heat exchange unit (3) are shown in figure 2.
And fourthly, a life-death unit method is applied, the life-death of the fuel quality unit (1), the air quality unit (2) and the convection heat exchange unit (3) is controlled, the consumption process of the fuel in the oil tank is simulated, the fuel quality unit (1) of the layer is killed when the fuel of one layer is consumed, the convection heat exchange unit (3) related to the fuel quality unit and the air quality unit (2) of the previous layer are killed, the air quality unit (2) of the layer and the fuel quality unit (1) of the next layer are activated, and the convection heat exchange unit (3) related to the layer is activated.
Furthermore, the simulation method is used for carrying out an oil tank simulation experiment, and parameter back calculation is carried out on the uncertain convective heat transfer coefficient according to the result of the oil tank test simulation experiment by applying Optimus parameter optimization software.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (1)
1. A method for simulating a transient temperature field of an oil tank structure is characterized by comprising the following steps:
step 1, establishing an oil tank structure model;
step 2, simplifying fuel oil and air in the fuel tank structure into a plurality of mass units, and dividing the fuel oil and the air into a plurality of layers in a spatial vertical direction through analyzing a fuel oil consumption process, wherein each layer comprises a fuel oil mass unit and an air mass unit;
step 3, establishing a convection heat exchange unit among the fuel quality unit, the air quality unit and the oil tank structure model according to the distribution condition of the fuel quality unit and the air quality unit, and setting a heat exchange coefficient of the convection heat exchange unit;
step 4, a life and death unit method is applied, and the life and death of the fuel quality unit, the air quality unit and the convection heat exchange unit are controlled to simulate the consumption and inflow process of the fuel in the oil tank;
determining the number of fuel oil dividing layers according to the fuel oil consumption speed in the step 2;
the specific steps of the fuel oil and air quality control unit and the convective heat transfer unit in the step 4 are as follows:
and when one layer of fuel is consumed, killing the fuel quality unit of the layer, killing the convective heat exchange unit related to the fuel quality unit and the air quality unit of the upper layer, activating the air quality unit of the layer and the fuel quality unit of the next layer, and activating the convective heat exchange unit related to the air quality unit of the layer.
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| CN113353286B (en) * | 2021-06-11 | 2022-06-17 | 南京航空航天大学 | Thermal analysis method for multi-compartment oil tank of helicopter |
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| WO2011100718A2 (en) * | 2010-02-13 | 2011-08-18 | Mcalister Roy E | Methods, devices, and systems for detecting properties of target samples |
| WO2010141634A1 (en) * | 2009-06-02 | 2010-12-09 | Prometheus Technologies, Llc | Conversion of algae to liquid methane, and associated systems and methods |
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| CN106529096A (en) * | 2016-12-19 | 2017-03-22 | 中国航空工业集团公司沈阳飞机设计研究所 | Analyzing method for temperature field of integral fuel tank |
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