CN117744530A - Pressure reconstruction analysis method for gap area of aviation fuel gear pump tooth crest - Google Patents
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Abstract
The invention discloses a pressure reconstruction analysis method for a gap area of an aviation fuel gear pump tooth top, which comprises the following steps: step one: a three-dimensional model of a fluid domain of the fuel gear pump of the aeroengine is derived; step two: carrying out grid independence test and simulation calculation of a plurality of typical working conditions, and carrying out test verification on a calculation result; step three: and combining the time function and the POD orthogonal basis to complete pressure reconstruction of the gear pump tooth top clearance area. The method has the advantages of reducing the simulation time of the fuel gear pump, increasing the simulation calculation stability, obtaining the continuous change of parameters such as pressure on a smaller simulation time scale, and the like, and particularly works in combination with a POD modal analysis method to analyze the pressure of a selected plane part time observation point to obtain a continuous change value of the pressure at a shorter time interval, reducing the time cost of unsteady flow field calculation in CFD, and finding that the pressure of the tooth top gap periodically changes along with the rotation of the gear by utilizing a linear heat map and spectrum analysis.
Description
Technical Field
The invention relates to the field of optimization design of fuel gear pumps of aeroengines, in particular to a pressure reconstruction analysis method for a gap area of a tooth top of an aero fuel gear pump.
Background
The working environment of the fuel gear pump of the aeroengine is bad and is influenced by multiple factors such as vibration, the optimal design scheme of the fuel gear pump needs to be improved repeatedly, a longer design period exists, researchers generally develop the design and the optimization work of the fuel pump through a computational fluid dynamics (Computational Fluid Dynamics, CFD) method, the CFD technology has a plurality of advantages, but when the fuel gear pump is applied to the rotating fuel gear pump, the change of an internal flow field of the fuel pump needs to be considered, the high computer performance is required, when the fuel pump is subjected to the fine design, the fluid heat and environmental factors need to be considered, at the moment, the simulation calculation time length is increased in geometric progression along with the multi-factor coupling such as the increase of design variables, the development period is prolonged, the development progress is influenced, in addition, in the iterative optimization process of the fuel gear pump, the structural parameter scheme of the fuel gear pump generally has different degrees of change, if the traditional CFD method is adopted for simulation analysis, the flow field grid of the gear pump is required to be drawn again according to the change of the scheme, the workload of the designer is seriously increased, and therefore, in order to reduce the workload and shorten the simulation time, the design range needs to be updated in the allowed precision range.
In addition, when the aeroengine fuel gear pump is designed, besides the steady-state performance under the rated working condition, the transient performance of a plurality of non-rated working condition design points is paid attention to, the conventional research means at present is to use CFD to carry out the calculation of the unsteady flow field of the fuel gear pump under different working conditions, and the simulation has the problems that on one hand, the grid reconstruction and iterative calculation are required to be continuously carried out, and the calculation period is extremely long; on the other hand, the gear meshing area is easy to generate negative volume during reconstruction, the defect that calculation is easy to diverge exists, only the internal flow field characteristic of the gear pump is solved in fluid-based external gear pump internal flow field simulation calculation published in 2017 of Nie Rui et al, and a pressure distribution cloud picture of internal flow is obtained, so that the problems still exist.
The POD method adopted by the invention has great theoretical advantages in the aspects of reducing the simulation time of the fuel gear pump, increasing the simulation calculation stability and obtaining the continuous change of parameters such as pressure on a smaller simulation time scale.
Novel matters of the invention
The invention provides an aviation fuel gear pump tooth top clearance area pressure reconstruction analysis method for solving the defects existing in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an analysis method for reconstructing pressure of a tooth top clearance area of an aviation fuel gear pump comprises the following steps:
step one: a three-dimensional model of a fluid domain of the fuel gear pump of the aeroengine is derived;
step two: carrying out grid independence test and simulation calculation of a plurality of typical working conditions, and carrying out experimental verification on calculation results;
step three: and combining the time function and the POD orthogonal basis to complete pressure reconstruction of the gear pump tooth top clearance area.
Preferably, the fluid area of the fuel gear pump in the first step consists of an inlet, a gear, an outlet and an unloading groove.
Preferably, the gear part in the second step draws a hexahedral structure grid, the inlet and outlet area and the unloading groove part draw a hexahedral Cartesian mixed grid, the gear part structure grid drawn by a Cartesian method based on a binary tree method has higher precision, encryption processing is carried out on tooth top gaps and gear meshing areas, and the complex change requirement of a flow field during gear rotation or meshing can be met.
Preferably, in the second step, in order to avoid a larger influence of the number of grids on the result in the simulation calculation, a grid independence test is required, and the change conditions of the minimum flow, the average flow and the maximum flow with the increase of the number of grids are detected, wherein the left and right ordinate respectively represent the errors of the flow of the gear pump and the average flow, the minimum flow, the average flow and the maximum flow of the gear pump with different grid numbers are different, and the gear pump gradually tends to be stable with the increase of the number of grids.
Preferably, in the third step, according to the initial flow field data obtained by simulation and the POD modal analysis method, the time function a on each node obtained by POD decomposition i (t j )，i∈[1，K]，j∈[1，N t ]And performing smooth spline fitting, expanding the original time interval, calculating a time function at a new time interval, and performing interpolation reconstruction on the initial flow field data by combining the corresponding POD mode to obtain a flow field data value at a shorter time interval.
Preferably, in order to further analyze the result after the POD interpolation reconstruction, a point with a more obvious pressure change is selected according to the result, and the reconstructed pressure value is subjected to spectrum analysis, wherein the closer to the outlet position, the greater the pressure change amplitude is.
Preferably, the fuel pressurization in the gear pump is shown to be a gradual process along with time, and is not in a linear relation with time, but most of pressurization is concentrated near an outlet area of the gear pump, so that the fuel pressurization is matched with a numerical simulation result, the frequency spectrum of an observation point near the outlet area of the gear pump has a larger amplitude than that of other areas, and the fuel pressurization meets the motion rule of the fuel gear pump.
Preferably, the pressure value at the observation point closer to the outlet area is larger, namely, the pressure of the tooth top clearance is periodically changed during the working process of the gear pump, and the period of the pressure value is related to the rotating speed of the gear, namely, the pressure change at the observation point is subjected to periodic change every time the gear rotates once.
Preferably, the phenomenon is consistent with the motion rule of the gear pump, when the gear moves to the point to be observed, the gear can squeeze the volume around the point, so that the pressure of surrounding oil liquid is increased,
preferably, when moving to the point just before leaving the observation point, the volume around the point becomes large, and the oil pressure decreases.
The novel structure of the invention has the following beneficial effects:
the invention provides the pressure reconstruction analysis method for the tooth top clearance area of the aviation fuel gear pump, which has obvious advantages in reducing the simulation time of the fuel gear pump, increasing the simulation calculation stability and obtaining the continuous change of parameters such as pressure on a smaller simulation time scale.
Drawings
FIG. 1 is a schematic flow chart of a novel embodiment of the present invention;
FIG. 2 is a schematic view of the flow field of a novel aviation fuel gear pump according to the present invention;
FIG. 3 is a schematic illustration of the fluid domain meshing of the novel proposed fuel gear pump of the present invention;
FIG. 4 is a diagram showing the result of the grid independence test proposed in the present invention;
FIG. 5 is a schematic view of the positions of the observation surfaces and the observation points on the gear according to the present invention;
FIG. 6 is a schematic diagram of the pressure at the observation point at different rotation speeds according to the present invention;
FIG. 7 is a diagram showing the POD pressure reconstruction at different induced rotational speeds according to the present invention;
fig. 8 is a schematic diagram of pressure spectrum values at different rotational speeds according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made more complete and clear with reference to the accompanying drawings in which embodiments of the present invention are shown, it being understood that the embodiments described are merely some, but not all, of the novel embodiments of the present invention.
Referring to fig. 1-8, an analysis method for pressure reconstruction of a gap area of a tooth top of an aviation fuel gear pump comprises the following steps:
step one: a three-dimensional model of a fluid domain of the fuel gear pump of the aeroengine is derived;
step two: carrying out grid independence test and simulation calculation of a plurality of typical working conditions, and carrying out experimental verification on calculation results;
step three: and combining the time function and the POD orthogonal basis to complete pressure reconstruction of the gear pump tooth top clearance area.
The study selects 4 grid schemes, the number of grids is 10×10 respectively 4 、43×10 4 、80×10 4 、110×10 4 Simulation calculation is carried out under the working condition of 12000rpm, the change conditions of the minimum flow, the average flow and the maximum flow along with the increase of the grid number are detected, the left and right ordinate respectively represents the errors of the flow of the gear pump and the average flow, and the minimum flow, the average flow and the maximum flow of the gear pump under different grid numbersThe maximum flow is different, the maximum flow gradually tends to be stable along with the increase of the number of grids, the pressure reconstruction of the gear pump tooth top clearance area is completed by combining a time function and a POD orthogonal basis, and the time function a on each node obtained by decomposing the POD is obtained according to initial flow field data obtained by simulation and a POD modal analysis method i (t j )，i∈[1，K]，j∈[1，N t ]Performing smooth spline fitting, expanding the original time interval, calculating a time function at a new time interval, performing interpolation reconstruction on initial flow field data by combining with a corresponding POD mode to obtain flow field data values at a shorter time interval, selecting 3 planes of a gear fluid region for observing the change condition of tooth top gap pressure along with rotation of a gear in the working process of a fuel gear pump, respectively selecting 38 observation points on the planes at equal intervals, performing numerical simulation under the working conditions of 9000, 12000 and 15000rpm, extracting pressure values on the observation points, wherein the pressure distribution in tooth top gaps has stronger symmetry, the observation points on the driving wheel side and the pressure values on the driven wheel side on the same plane are basically consistent, because only the meshing relationship of the gears has phase difference, in order to shorten the research time, 20 points on the driven wheel side are selected, the pressure change of the driven wheel side under different rotating speeds is drawn, the observed pressure change has stronger periodicity, but the amplitude of the periodical change has larger difference, wherein the amplitude of the pressure change on a plane 2 is the largest, the symmetry of the gear structure ensures that the pressure distribution of an upper plane 1 and a lower plane 3 also presents a symmetrical result, the POD decomposition is carried out on the pressure at different moments of the observation points and then the interpolation is carried out, the time points are expanded to 100, and the linear heat maps on three planes under the working conditions of 9000, 12000 and 15000rpm are respectively drawn, wherein p/p nmax The ratio of the pressure of the point at the current moment to the maximum pressure value on the plane of the point is shown, the larger the ratio is, the larger the relative pressure of the point is, the darker the color is, the pressure of the observation points on different planes shows obvious color period change along with the increase of the time steps, the change period is approximately consistent, the pressure of the points on the tooth top gap shows periodic change along with the time in the movement process of the gear pump is shown, and the gear pump is not shownThe change period on the same point is approximately the same, the closer to the outlet position, the larger the pressure change amplitude is, which shows that the fuel pressurization in the gear pump is a gradual process along with time, not in a linear relation with time, but the majority of pressurization is concentrated near the outlet region of the gear pump and is matched with the numerical simulation result, the result after POD interpolation and reconstruction is further analyzed, 5 points with more obvious pressure change are selected according to the result, the spectrum analysis is carried out on the reconstructed pressure value, the spectrum amplitude of the observation point appears in the low-frequency region under the working condition of three rotating speeds, the observation point 15 has higher amplitude than the point 17, the spectrum of the observation point near the outlet region of the gear has larger amplitude than other regions, the motion rule of the fuel gear pump is met, the pressure value on the observation point near the outlet region is larger, secondly, the highest amplitude frequencies under three working conditions of 9000, 12000 and 15000rpm are respectively 1500, 2000 and 2500Hz, the motion rule of the gears at the rotating speeds is consistent, namely, the pressure of the tooth top gap is periodically changed during the working process of the gear pump, the period of the gear is related to the rotating speed of the gears, for example, the rotating period of the gears is 0.004s under the working condition of 15000rpm, the number of teeth is 10, so the rotating frequency of each tooth is 1/(0.004/10) =2500 Hz, the main pressure frequency of the observation points on the planes 1, 2 and 3 is 2500Hz, the main pressure frequency of the observation points on the planes 1, 2 and 3 is consistent with the rotating frequency of the gears at the rotating speed, namely, the pressure change at the points is subjected to periodic change once when the gears are in motion rule of the gear pump, the phenomenon is also consistent with the motion rule, the gears can squeeze the volume around the points when moving to the point to be about to pass the observation points, the surrounding oil pressure is increased, the surrounding volume of the point is increased when the point moves to be separated from the observation point, and the oil pressure is reduced, so that the result shows that the change frequency of the pressure on the observation point is consistent with the rotation frequency of the gear, and the accuracy of the POD interpolation reconstruction method is proved according to the motion theory of the gear pump.
The eigenvoice decomposition is a data statistics method based on vectors, a group of orthogonal bases can be obtained according to the existing data calculation, subspaces formed by the orthogonal bases can approximate to the original data with low degree of freedom in high fidelity, the subspaces are widely applied to aspects of data dimension reduction, flow field reconstruction and the like, when the eigenvoice decomposition is applied to flow field analysis, the flow field is decomposed into a series of linear superposition of time functions and space orthogonal base products, three POD methods are developed based on the principle, and the three POD methods comprise a direct POD method, a snapshot POD method and a POD method based on singular value decomposition, wherein the POD method based on singular value decomposition has more accurate calculation results and obvious advantages in terms of reducing simulation calculation amount, and therefore, the invention selects the POD method based on singular value decomposition to carry out.
For high-dimensional data matrix C m×n The centering process is performed, i.e. the average value of each column of data is subtracted:
C′＝C-C (1)
(2) Processing the centralized data matrix by using Singular Value Decomposition (SVD), and decomposing to obtain a left singular matrix, a singular value matrix and a right singular matrix:
C′＝P∑Q T (2)
where P is an mxm matrix, Σ is an mxn matrix, which is all 0 except for the element on the main diagonal, each element on the main diagonal is called singular value, Q is an nxn matrix, P and Q are unitary matrices, i.e.:
P T P＝I Q T Q＝I (3)
(3) Solving a time coefficient a, namely:
a＝P·∑ (4)
(4) Solving a eigenvalue lambda, namely the energy of each order mode:
(5) Basis function Q obtained by solving i (x) Corresponding time coefficient a i (t) reconstructing a data matrix:
the novel use method and the advantages of the invention: when the method for analyzing the pressure reconstruction of the gap area of the gear head of the aviation fuel gear pump is used, the working process is as follows:
as shown in figures 1, 2, 3, 4, 5, 6, 7 and 8,
step one: a three-dimensional model of the flow field of the fuel gear pump of the aeroengine is derived, and fig. 2 shows the flow field of the fuel gear pump used in the method, and the flow field consists of an inlet, a gear, an outlet and an unloading groove.
Step two: the grid independence test and simulation calculation of a plurality of typical working conditions are carried out, and test verification is carried out on calculation results, wherein a hexahedral structure grid is drawn by a gear part, a hexahedral Cartesian mixed grid is drawn by an inlet and outlet area and an unloading groove part, the divided grid results are shown in a graph as shown in fig. 3, the grid precision of the gear part structure drawn by a Cartesian method based on a binary tree method is higher, encryption processing is carried out on tooth top gaps and gear meshing areas, and the complex change requirements of flow fields during gear rotation or meshing can be met.
In order to avoid the great influence of the grid number on the result in the simulation calculation, the grid independence test is needed, 4 grid schemes are selected for research, and the grid numbers are respectively 10 multiplied by 10 4 、43×10 4 、80×10 4 、110×10 4 Simulation calculation is carried out under the working condition of 12000rpm, the change conditions of the minimum flow, the average flow and the maximum flow with the increase of the number of grids are detected, and the result is shown in fig. 4, wherein the left and right ordinate respectively represents the errors of the flow of the gear pump and the average flow.
As can be seen from the graph, the minimum flow, the average flow and the maximum flow of the gear pump under different grid numbers are different, and gradually tend to be stable along with the increase of the grid number, wherein the average flow errors of the scheme III and the scheme IV are 0.072 and 0.07 respectively, which indicates that the scheme III can perform calculation meeting simulation precision under lower computer performance and shorter calculation time, so that the simulation analysis is performed by adopting the grid number of the scheme III.
Step three: gear pump completed by combining time function and POD orthogonal basePressure reconstruction of tooth crest clearance area, according to initial flow field data obtained by simulation and POD modal analysis method, time function a on each node obtained by POD decomposition i (t j )，i∈[1，K]，j∈[1，N t ]And performing smooth spline fitting, expanding the original time interval, calculating a time function at a new time interval, and performing interpolation reconstruction on the initial flow field data by combining the corresponding POD mode to obtain a flow field data value at a shorter time interval.
In order to observe the change condition of the tooth top gap pressure of the fuel gear pump along with the rotation of the gear in the working process, as shown in fig. 5, 3 planes of a gear fluid area are selected, 38 observation points are respectively selected on the planes at equal intervals, numerical simulation is carried out under the working conditions of 9000, 12000 and 15000rpm, the pressure values on the observation points are extracted, the pressure distribution in the tooth top gap is provided with stronger symmetry, the pressure values of the observation points on the driving wheel side and the pressure values of the points on the driven wheel side on the same plane are basically consistent, and only the meshing relationship of the gears has phase difference, so that 20 points on the driven wheel side are selected for shortening the research time, the pressure changes at different rotation speeds are drawn, as shown in fig. 6, the observed pressure changes have stronger periodicity, but the amplitude of the periodical changes has larger difference, wherein the pressure change amplitude on the plane 2 is the largest, and the symmetry of the gear structure enables the pressure distribution of the upper plane 1 and the lower plane 3 to also present a symmetrical result.
In order to deeply analyze the pressure pulsation condition in the gear movement process, POD decomposition is carried out on the pressure at different moments of the observation point, interpolation reconstruction is carried out, the time points are expanded to 100, and linear heat maps on three planes under the working conditions of 9000, 12000 and 15000rpm are respectively drawn, as shown in figure 7, wherein p/p nmax Indicating the ratio of the pressure at the point at the current time to the maximum pressure value on the plane in which the point is located, the larger the ratio is, the larger the relative pressure at the point is, the darker the color is,
the pressure of observation points on different planes shows obvious color period change along with the increase of the number of time steps, the change periods are approximately consistent, the pressure of points on tooth top gaps shows periodic change along with the time in the motion process of the gear pump, the change periods on different points are approximately the same, the closer to the outlet position, the larger the pressure change amplitude is, the fuel pressurization in the gear pump is a gradual progress along with the time, the fuel pressurization is not in a linear relation with the time, and most of pressurization is concentrated near the outlet area of the gear pump and is consistent with the numerical simulation result.
In order to further analyze the result after the POD interpolation reconstruction, 5 points with obvious pressure change are selected according to the result in fig. 6, spectrum analysis is performed on the reconstructed pressure value, as shown in fig. 8, the result shows that, under three rotation speed working conditions, the spectrum amplitude of the observation point appears in a low frequency area, the observation point 15 and the point 17 have higher amplitude, the spectrum of the observation point near the gear outlet area has larger amplitude compared with other areas in combination with the position of the observation point shown in fig. 5, the motion rule of the fuel gear pump is met, the pressure value on the observation point near the outlet area is larger, and then, the highest frequency of the amplitude under three working conditions of 9000, 12000 and 15000rpm is found to be 1500, 2000 and 2500Hz respectively, the gear movement rule is consistent with the gear movement rule at the rotating speed, namely, when the gear pump works, the pressure of the tooth top gap is periodically changed, the period of the gear is related to the rotating speed of the gear, for example, under the working condition of 15000rpm, the rotating period of the gear is 0.004s, the number of teeth is 10, so that the rotating frequency of each tooth is 1/(0.004/10) =2500 Hz, as can be seen from fig. 8 (c), the main frequency of the pressure of the observation points on the planes 1, 2 and 3 is 2500Hz, the pressure of the observation points on the planes is consistent with the rotating frequency of the gear at the rotating speed, namely, when the gear rotates once through the observation point, the pressure on the point is changed to undergo one time of periodic change, the phenomenon is consistent with the movement rule, and when the gear moves to the observation point to be about to pass through the observation point, the volume around the point is extruded, so that the surrounding oil pressure is increased; when the POD interpolation reconstruction method moves to the point to be separated from the observation point, the surrounding volume of the point is increased, and the oil pressure is reduced, so that the result shows that the change frequency of the pressure on the observation point is consistent with the rotation frequency of the gear, and the POD interpolation reconstruction method accords with the motion theory of the gear pump.
The above-mentioned embodiments are only preferred embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to substitute or change the novel technical scheme and the novel concept of the present invention within the scope of the novel invention.
Claims (10)
1. The method for analyzing the pressure reconstruction of the gap area of the tooth tops of the aviation fuel gear pump is characterized by comprising the following steps of:
step one: a three-dimensional model of a fluid domain of the fuel gear pump of the aeroengine is derived;
step two: carrying out grid independence test and simulation calculation of a plurality of typical working conditions, and carrying out experimental verification on calculation results;
step three: and combining the time function and the POD orthogonal basis to complete pressure reconstruction of the gear pump tooth top clearance area.
2. The method for analyzing the pressure reconstruction of the gap area of the tooth tops of the gear pump of the aviation fuel according to claim 1, which is characterized in that: the fuel gear pump fluid domain in the first step consists of an inlet, a gear, an outlet and an unloading groove.
3. The method for analyzing the pressure reconstruction of the gap area of the tooth tops of the gear pump of the aviation fuel according to claim 1, which is characterized in that: and in the second step, the gear part draws a hexahedral structure grid, the inlet and outlet area and the unloading groove part draw a hexahedral Cartesian mixed grid, the gear part structure grid drawn by a Cartesian method based on a binary tree method has higher precision, encryption processing is carried out on tooth top gaps and gear meshing areas, and the complex change requirement of a flow field during gear rotation or meshing can be met.
4. The method for analyzing the pressure reconstruction of the gap area of the tooth tops of the gear pump of the aviation fuel according to claim 1, which is characterized in that: in the second step, in order to avoid the larger influence of the grid number on the result in the simulation calculation, the grid independence test is needed, the change conditions of the minimum flow, the average flow and the maximum flow along with the increase of the grid number are detected, the left and right ordinate respectively represent the errors of the flow of the gear pump and the average flow, the minimum flow, the average flow and the maximum flow of the gear pump under different grid numbers are different, and the gear pump gradually tends to be stable along with the increase of the grid number.
5. The method for analyzing the pressure reconstruction of the gap area of the tooth tops of the gear pump of the aviation fuel according to claim 1, which is characterized in that: in the third step, according to the initial flow field data obtained by simulation and the POD modal analysis method, a time function a on each node obtained by POD decomposition is performed i (t j )，i∈[1，K]，j∈[1，N t ]And performing smooth spline fitting, expanding the original time interval, calculating a time function at a new time interval, and performing interpolation reconstruction on the initial flow field data by combining the corresponding POD mode to obtain a flow field data value at a shorter time interval.
6. The method for analyzing the pressure reconstruction of the gap area of the tooth tops of the gear pump of the aviation fuel according to claim 1, which is characterized in that: in order to further analyze the result after POD interpolation reconstruction, a point with obvious pressure change is selected according to the result, spectrum analysis is performed on the reconstructed pressure value, and the pressure change amplitude is larger when the reconstructed pressure value is closer to the outlet position.
7. The method for analyzing the pressure reconstruction of the gap area of the tooth tops of the gear pump of the aviation fuel according to claim 1, which is characterized in that: the fuel pressurizing in the gear pump is shown to be a gradual process along with time, is not in a linear relation with time, but is concentrated near an outlet area of the gear pump, is matched with a numerical simulation result, has a larger amplitude compared with other areas, and accords with the motion rule of the fuel gear pump.
8. The method for analyzing the pressure reconstruction of the gap area of the tooth tops of the gear pump of the aviation fuel according to claim 1, which is characterized in that: the pressure value at the observation point which is closer to the outlet area is larger, namely, the pressure of the tooth top gap is periodically changed during the working process of the gear pump, and the period of the pressure value is related to the rotating speed of the gear, namely, the pressure at the observation point is periodically changed every time the gear rotates once.
9. The method for analyzing the pressure reconstruction of the gap area of the tooth tops of the gear pump of the aviation fuel according to claim 1, which is characterized in that: the phenomenon is also consistent with the motion rule of the gear pump, and when the gear moves to the point to be observed, the gear can squeeze the volume around the point, so that the pressure of surrounding oil liquid is increased.
10. The method for analyzing the pressure reconstruction of the gap area of the tooth tops of the gear pump of the aviation fuel according to claim 1, which is characterized in that: when the oil moves to the point which is about to leave the observation point, the volume around the point becomes large, and the oil pressure is reduced.
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