A probe measurement point layout method, system and device for flow field measurement

Abstract

The purpose of the present invention is to provide a probe measurement point layout method, system, and device for flow field measurement, which relates to the field of flow field measurement technology. The method includes: determining the current judgment parameter based on the rough measured velocity at the current measurement point and the rough measured velocity at the current adjacent measurement point, as well as the distance between the current measurement point and the current adjacent measurement point; updating the measurement point sequence at the previous iteration based on the current judgment parameter to obtain the measurement point sequence at the current iteration; using the current adjacent measurement point as the current measurement point, and returning to iterate the above steps until all measurement points are traversed, and determining that the measurement point sequence at the last iteration is the optimal probe measurement point layout for the flow field to be measured. The present invention can optimize the probe measurement point layout during flow field measurement, thereby improving the accuracy of flow field measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of flow field measurement, and in particular to a probe measuring point layout method, system and equipment for flow field measurement. Background Art

[0002] Five-hole probes are a common tool for high-precision aerodynamic measurements. Designed to measure three-dimensional velocity vectors and static pressure in a flow field, they are commonly used in wind tunnel experiments and aircraft aerodynamic testing. The "five holes" in a five-hole probe refer to the five pressure ports located on the four sides of the front of the probe. The front port is typically used as a dynamic pressure port, providing a reading of total pressure, while the four side ports, located around the front of the probe, measure pressure differences that can be used to determine the direction of the airflow. These pressure differences can be used to calculate velocity components in three orthogonal coordinate directions: longitudinal, lateral, and vertical. Five-hole probes have a wide range of applications in aerodynamic measurement. For example, in aerospace, data from five-hole probes is used to optimize the aerodynamic shape of aircraft. In the energy industry, five-hole probes enhance understanding of flows within combustion chambers. Compared to other types of flow velocity measurement tools, such as single-hole pitot tubes or three-hole probes, five-hole probes provide more comprehensive flow field information. They can accurately measure even when the flow is not perfectly aligned with the probe axis, which is crucial when dealing with complex three-dimensional and rotational flows.

[0003] In complex flows, strong vortex turbulence and strong shock waves lead to drastic changes in air flow velocity and density, which pose challenges to the performance of the probe and the accuracy of the measurement results. The design of the five-hole probe layout is crucial to accurately capture the flow field structure.

[0004] A five-hole probe acquires local flow field parameters by performing point-by-point measurements at specific locations. The effectiveness of this technique depends significantly on the carefully selected location and distribution of these measurement points. Traditionally, these points are located based on experience and anticipated flow field characteristics. However, due to cost, time, and physical space constraints, the number of measurement points in a five-hole probe is often limited, and most probes tend to be arranged in a uniform layout. To obtain a complete picture of the flow field in this layout, linear interpolation is often used to estimate the flow field data between the unmeasured points. While linear interpolation provides a reasonable approximation in regions with relatively uniform flow and gently varying parameters, it may not effectively capture all flow details in areas with rapidly changing flow or complex structures. In particular, when encountering rapid velocity variations in the flow field, such as shock waves, separated flows, and vortices, the standard five-hole probe layout and its simple interpolation methods can miss important flow field information. Due to the large intervals between measuring points, areas that are not directly measured may have significant parameter changes, and these changes may be smoothed out or completely ignored during the interpolation process, resulting in the omission of local flow characteristics and dynamics. This loss of information not only affects the understanding of the current flow field, but also when designing and analyzing application systems that are highly sensitive to flow details, the reduction in accuracy may lead to inaccurate performance predictions. If the flow field data is not accurate enough, performance evaluation and optimization may produce errors, affecting the analysis results of flow characteristics. Currently, most of the flow field measurement technologies for drastic velocity changes focus on the design of differential optimization of five-hole probe data, and there are relatively few probe measurement point layout optimization technologies. Summary of the Invention

[0005] The purpose of the present invention is to provide a probe measuring point layout method, system and equipment for flow field measurement, which can improve the accuracy of flow field measurement by optimizing the probe measuring point layout during flow field measurement.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A probe measurement point layout method for flow field measurement, comprising:

[0008] Acquire an initial measurement point sequence; wherein the plurality of measurement points in the initial measurement point sequence are all located in the flow field to be measured;

[0009] Obtain the rough velocity at each measuring point in the flow field to be measured;

[0010] Determine the initial measurement point sequence as the measurement point sequence at 0 iterations;

[0011] Determine the first measuring point in the initial measuring point sequence as the current measuring point;

[0012] Determine that the next measuring point of the current measuring point is the current adjacent measuring point;

[0013] Determine the current judgment parameter according to the rough measured speed at the current measuring point, the rough measured speed at the current adjacent measuring point, and the distance between the current measuring point and the current adjacent measuring point;

[0014] Update the measurement point sequence of the previous iteration according to the current judgment parameter to obtain the measurement point sequence of this iteration;

[0015] The current adjacent measuring point is used as the current measuring point, and the step of "determining the next measuring point of the current measuring point as the current adjacent measuring point" is returned to until the initial measuring point sequence is traversed, and the measuring point sequence at this iteration is determined to be the optimal probe measuring point layout for the flow field to be measured.

[0016] Optionally, after determining that the measurement point sequence in this iteration is the optimal probe measurement point layout for the flow field to be measured, the method further includes:

[0017] Determining a fine measurement speed at each optimized measurement point in an optimal probe measurement point layout; the optimized measurement point is an element in the optimal probe measurement point layout;

[0018] According to the detailed measured velocities at all optimized measuring points in the flow field to be measured, the flow diagram image of the flow field to be measured is determined.

[0019] Optionally, the rough speed is measured using a three-hole probe;

[0020] The fine measurement speed is obtained by measuring using a five-hole probe.

[0021] Optionally, the current judgment parameter is determined based on the rough measured speed at the current measuring point and the rough measured speed at the current adjacent measuring point, as well as the distance between the current measuring point and the current adjacent measuring point, including:

[0022] Determine the absolute value of the difference between the rough speed at the current adjacent measuring point and the rough speed at the current measuring point as the first-order speed difference;

[0023] Determine the distance between the current measuring point and the current adjacent measuring point as the current interval distance;

[0024] Determine whether the current interval distance is less than a distance threshold, and obtain a first determination result;

[0025] If the first judgment result is yes, determining the first-order difference of the speed as the to-be-determined judgment parameter;

[0026] If the first judgment result is no, then the ratio of the first-order difference of the speed to the current interval distance is determined as the to-be-determined judgment parameter.

[0027] Optionally, after determining the ratio of the first-order difference of the velocity to the current interval distance as the to-be-determined judgment parameter, the method further includes:

[0028] The inverse tangent function is used to normalize the pending judgment parameters to obtain the current judgment parameters.

[0029] Optionally, updating the measurement point sequence of the previous iteration according to the current judgment parameter to obtain the measurement point sequence of the current iteration includes:

[0030] Determine whether the current judgment parameter is less than the judgment parameter lower limit, and obtain a second judgment result;

[0031] If the second judgment result is yes, the current measuring point is deleted to obtain the measuring point sequence for this iteration;

[0032] If the second judgment result is no, determine whether the current judgment parameter is less than the upper limit of the first judgment parameter to obtain a third judgment result;

[0033] If the third judgment result is yes, determining the measurement point sequence in the previous iteration as the measurement point sequence in the current iteration;

[0034] If the third judgment result is no, determining the interval between the current measuring point and the current adjacent measuring point as the current interval;

[0035] Perform measurement point interpolation processing within the current interval to obtain the measurement point sequence for this iteration.

[0036] Optionally, perform interpolation of measurement points within the current interval, including:

[0037] Obtaining a second judgment parameter upper limit and a minimum measurement distance; the minimum measurement distance is determined according to the size of the speed measurement device;

[0038] Determine the product of the second judgment parameter upper limit and the current interval distance as an intermediate value;

[0039] Determine the absolute value of the ratio of the intermediate quantity to the current judgment parameter as the undetermined theoretical distance;

[0040] Determine whether the undetermined theoretical distance is less than the minimum measurement distance to obtain a fourth determination result;

[0041] If the fourth judgment result is yes, determining that the minimum measured distance is the theoretical distance;

[0042] If the fourth judgment result is no, determining the undetermined theoretical distance as the theoretical distance;

[0043] Rounding up the ratio of the current spacing distance to the theoretical spacing distance to obtain an equal fraction;

[0044] Divide the current interval into equal parts according to the equal number of equal parts, and add a measurement point at each equal division point.

[0045] A probe measuring point layout system for flow field measurement, comprising:

[0046] An initial measurement point sequence acquisition module is used to acquire an initial measurement point sequence; multiple measurement points in the initial measurement point sequence are all located in the flow field to be measured;

[0047] A rough velocity determination module is used to obtain the rough velocity at each measuring point in the flow field to be measured;

[0048] Iterative initialization module, used to determine the initial measurement point sequence is the measurement point sequence when the iteration is 0;

[0049] The current measuring point determination module is used to determine the first measuring point in the initial measuring point sequence as the current measuring point;

[0050] The current adjacent measuring point module is used to determine the next measuring point of the current measuring point as the current adjacent measuring point;

[0051] A current judgment parameter module is used to determine the current judgment parameter according to the rough measured speed at the current measuring point and the rough measured speed at the current adjacent measuring point, as well as the distance between the current measuring point and the current adjacent measuring point;

[0052] A measuring point sequence updating module, configured to update the measuring point sequence of the previous iteration according to the current judgment parameter to obtain the measuring point sequence of the current iteration;

[0053] The optimal probe measuring point layout module is used to take the current adjacent measuring point as the current measuring point and return to the step of "determining that the next measuring point of the current measuring point is the current adjacent measuring point" until the initial measuring point sequence is traversed, and the measuring point sequence at this iteration is determined to be the optimal probe measuring point layout for the flow field to be measured.

[0054] An electronic device includes a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute a probe measurement point layout method for flow field measurement.

[0055] Optionally, the memory is a readable storage medium.

[0056] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0057] The present invention provides a probe measurement point layout method, system and equipment for flow field measurement. Based on the flow velocity information obtained by initially arranging three-hole probes in a flow with drastic velocity changes, the layout of the five-hole probe measurement points is encrypted or deleted, so as to more accurately and efficiently obtain flow field information and flow characteristics. This strategy involves analyzing and processing the initial flow field measurement results, maintaining the measurement point density in areas where the flow field velocity changes normally, deleting the measurement points in areas where the flow field velocity changes slowly, and arranging additional measurement points in key areas where the velocity changes drastically in the flow field. At the same time, a method for adding measurement points is disclosed. Subsequently, more measurement points are added in these key areas to perform refined secondary measurements. This breaks the limitations of the existing uniform layout or empirical layout when arranging measurement points, saves resources and costs, and avoids the cost of blindly adding measurement points and the complexity of processing data throughout the flow field. It not only improves measurement efficiency and accuracy, ensures that important flow information is not lost due to the limitations of the measurement point layout, but also has great practical significance for systems and application scenarios with particularly high design sensitivity, such as precision engineering and high-speed areas of the suction surface in annular leaf channels. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0059] Figure 1 Flowchart of the probe measurement point layout method for flow field measurement in Example 1 of the present invention;

[0060] Figure 2 This is a flow chart of the measurement point sequence method in Example 1 of the present invention;

[0061] Figure 3 The velocity distribution diagram measured at the initial measuring point in Example 1 of the present invention;

[0062] Figure 4 This is the velocity distribution diagram after secondary layout in Example 1 of the present invention;

[0063] Figure 5 The velocity distribution diagram is obtained from the initial measurement point near the top of the blade in Example 1 of the present invention;

[0064] Figure 6 This is the velocity distribution diagram after secondary layout near the top of the blade in Example 1 of the present invention. DETAILED DESCRIPTION

[0065] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0066] The purpose of the present invention is to provide a probe measuring point layout method, system and equipment for flow field measurement, which can improve the accuracy of flow field measurement by optimizing the probe measuring point layout during flow field measurement.

[0067] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0068] Example 1

[0069] like Figure 1 As shown, this embodiment provides a probe measurement point layout method for flow field measurement, including:

[0070] Step 101: Acquire an initial measurement point sequence. Multiple measurement points in the initial measurement point sequence are all located in the flow field to be measured.

[0071] Step 102: Obtain the rough velocity at each measuring point in the flow field to be measured.

[0072] Step 103: Determine that the initial measurement point sequence is the measurement point sequence at 0 iterations.

[0073] Step 104: Determine the first measuring point in the initial measuring point sequence as the current measuring point.

[0074] Step 105: Determine that the next measuring point of the current measuring point is the current adjacent measuring point.

[0075] Step 106: Determine current judgment parameters based on the rough measured speed at the current measuring point, the rough measured speed at the current adjacent measuring point, and the distance between the current measuring point and the current adjacent measuring point.

[0076] Step 107: Update the measurement point sequence of the previous iteration according to the current judgment parameter to obtain the measurement point sequence of this iteration.

[0077] Step 108: The current adjacent measuring point is used as the current measuring point, and the process returns to step 105 until the initial measuring point sequence is traversed, and the measuring point sequence at this iteration is determined to be the optimal probe measuring point layout for the flow field to be measured.

[0078] Step 109: Determine the fine speed at each optimized measurement point in the optimal probe measurement point layout. The optimized measurement point is an element in the optimal probe measurement point layout. The coarse speed is measured using a three-hole probe. The fine speed is measured using a five-hole probe.

[0079] Step 1010: Determine a flow chart image of the flow field to be measured based on the detailed measured velocities at all optimized measuring points in the flow field to be measured.

[0080] Step 106 includes:

[0081] Step 106 - 1 : Determine the absolute value of the difference between the coarse velocity measured at the current adjacent measuring point and the coarse velocity measured at the current measuring point as the first-order velocity difference.

[0082] Step 106 - 2 : Determine the distance between the current measuring point and the current adjacent measuring point as the current interval distance.

[0083] Step 106-3: Determine whether the current interval distance is less than the distance threshold, and obtain a first determination result. If the first determination result is yes, execute step 106-4; if the first determination result is no, execute step 106-5.

[0084] Step 106 - 4 : Determine the first-order difference of velocity as a to-be-determined judgment parameter.

[0085] Step 106 - 5 : Determine the ratio of the first-order difference of the velocity to the current interval distance as a pending judgment parameter.

[0086] Step 106 - 6 : Use the inverse tangent function to normalize the pending judgment parameter to obtain the current judgment parameter.

[0087] like Figure 2 , step 107 includes:

[0088] Step 107-1: Determine whether the current judgment parameter is less than the judgment parameter lower limit, and obtain a second judgment result. If the second judgment result is yes, execute step 107-2; if the second judgment result is no, execute step 107-3.

[0089] Step 107-2: Delete the current measurement point to obtain the measurement point sequence for this iteration.

[0090] Step 107-3: Determine whether the current judgment parameter is less than the upper limit of the first judgment parameter to obtain a third judgment result. If the third judgment result is yes, execute step 107-4; if the third judgment result is no, execute step 107-5.

[0091] Step 107 - 4 : Determine the measurement point sequence of the previous iteration as the measurement point sequence of this iteration.

[0092] Step 107 - 5 : Determine the interval between the current measuring point and the current adjacent measuring point as the current interval.

[0093] Step 107-6: Perform measurement point interpolation processing within the current interval to obtain the measurement point sequence for this iteration.

[0094] Step 107-6 includes:

[0095] Step 107-6-1: Obtain the upper limit of the second judgment parameter and the minimum measurement distance. The minimum measurement distance is determined according to the size of the speed measurement device.

[0096] Step 107-6-2: Determine the product of the upper limit of the second judgment parameter and the current interval distance as the intermediate value.

[0097] Step 107-6-3: Determine the absolute value of the ratio of the intermediate value to the current judgment parameter as the to-be-determined theoretical distance.

[0098] Step 107-6-4: Determine whether the theoretical distance to be determined is less than the minimum measurement distance, and obtain a fourth determination result. If the fourth determination result is yes, execute step 107-6-5; if the fourth determination result is no, execute step 107-6-6.

[0099] Step 107-6-5: Determine the minimum measured distance as the theoretical distance.

[0100] Step 107-6-6: Determine the undetermined theoretical spacing as the theoretical spacing.

[0101] Step 107-6-7: Round up the ratio of the current spacing distance to the theoretical spacing distance to obtain an equal fraction.

[0102] Step 107-6-8: Divide the current interval into equal parts according to the equal number of points, and add a measurement point at each equal division point.

[0103] The overall concept behind supplementary measuring points is to determine the need for additional measuring points based on the initial measurement results. Additional measuring points are then added to specific areas of the flow field for a second supplementary measurement, resulting in more accurate and reliable velocity changes and flow characteristics. The decision to add additional measuring points is primarily based on the velocity variations between measuring points. Judgment parameters are set as reference indicators to measure the velocity distribution obtained from the initial measurement. These parameters are manually selected after normalization to accommodate different measurement requirements. Furthermore, the minimum measurement spacing in actual measurements should be considered. If the calculated measuring point position is less than the minimum spacing, the requirements for flow field variation should be relaxed, and the measuring points should be arranged according to the minimum spacing.

[0104] According to the above analysis, the characteristics of the method for obtaining measurement point encryption are mainly as follows:

[0105] According to the density of measuring points in actual applications, the parameter gradient and first-order difference are used as the judgment function |c t |:

[0106]

[0107] V is the velocity, subscript i represents the i-th measuring point; x i is the actual distance between the i-th measuring point and the i+1-th measuring point; a is the minimum distance between measuring points, which is usually x min , the minimum spacing is different under different measurement conditions; b is the boundary spacing of gradient criterion and differential criterion. According to the theory of grid adaptive method, generally 5 to 8 times of the minimum size of the measuring point is a reasonable value range.

[0108] When the density of measuring points is sufficient, the gradient that can better reflect the speed of flow field velocity change is used for measurement; when the density of measuring points is not enough to support the calculation of velocity gradient at the measuring point, the first-order difference is used to intuitively reflect the parameter changes between measuring points. After obtaining the judgment parameters, it is necessary to determine the upper threshold value|c u | and the lower threshold |c d |, use this as the upper and lower criteria for adding and deleting points.

[0109] In practical applications, to eliminate the impact of the indicator dimension, data normalization is required so that the preprocessed data is limited to a certain range (such as [0, 1] or [-1, 1]), thereby eliminating the adverse effects caused by singular sample data. Singular sample data refers to sample data that is particularly large or small relative to other input samples. Considering that in a flow field with drastic velocity changes, the velocity fluctuation is large, the maximum and minimum values ​​of the velocity are unstable, which will make the subsequent values ​​of the maximum and minimum normalization (Max Min Normalization) unstable. After comprehensive consideration, it was decided to use the inverse tangent function normalization to process the judgment parameters:

[0110]

[0111] Among them, |c n,i The value range of | is [0.1]. Hereinafter, the normalized judgment parameter is referred to as the judgment parameter. According to the adaptive method of the grid to the gradient, the upper limit of the threshold value |c u | is 0.7~0.9, the lower limit of the threshold|c d | Take 0.2~0.4, generally ensure that the upper threshold is more than twice the lower threshold, so as to ensure the judgment parameter after deleting redundant measurement points|c n,i | new Within the range of the upper and lower limits of the threshold. Use the upper and lower limits of the threshold to judge the calculated judgment parameters: when the judgment parameter |c n,i|Below upper threshold|c u |and above the lower threshold|c d |No processing is required; when judging the parameter |c n,i |Below the lower threshold|c u |, then the i-th measuring point between the i-1th measuring point and the i+1th measuring point can be removed to reduce unnecessary time and measurement costs; when the judgment parameter |c n,i |Above the upper threshold|c u |, the interval of the i-th measuring point needs to be encrypted.

[0112] When the distance between two adjacent measuring points needs to be increased, first calculate the theoretical distance x that can meet the parameter threshold. t,i , the calculation formula is:

[0113]

[0114] Where: x t,i is the theoretical distance between the i-th measuring point and the i+1-th measuring point. Reduce the distance between measuring points to x t,i When the judgment parameter between the measuring points |c n,i | will be less than the upper threshold value|c t |, which meets the measurement requirements. However, in actual measurement, the distance between measuring points generally has a minimum value x min , when x t,i Less than x min When the actual measurement cannot meet the measurement point spacing, x t,i Should be taken as x min In order to capture the speed change information as much as possible, the processed x t,i It can be guaranteed to be of practical significance.

[0115] Use x t,i The measurement point interval is divided equally into:

[0116]

[0117] In the formula, the brackets represent rounding up. i After n equal divisions, the equal division points are the newly added measurement points. The specific encryption process is as follows Figure 1 First, obtain the measurement results based on the preliminary arrangement of measurement points and determine the minimum supplementary measurement interval h minThe system calculates the parameter change at adjacent measuring points based on the upper and lower thresholds. If so, the measuring point is encrypted and its coordinates are output for additional measurement. If less than the lower limit, the measuring point is removed from the layout. This calculation process allows for secondary replenishment of flow fields with sparsely distributed measuring points, capturing areas with more dramatic parameter changes for more complete flow field information. It also effectively reduces unnecessary data for probe layouts with more uniform changes and a larger number of measuring points.

[0118] In order to verify the rationality of the layout improvement method, the first-stage guide vane channel of a certain type of engine high-pressure turbine was selected as the experimental component. The initial flow field distribution was obtained by numerical calculation, and then the velocity distribution along the flow direction at different blade heights was obtained by uniform measurement point arrangement. Then, the layout was optimized based on the velocity distribution obtained by the uniform measurement point arrangement. The measurement points were added or deleted by setting the upper and lower thresholds and the minimum value of the measurement points. The measurement points were deleted in places where it was not necessary to increase the density, and the density was increased in places where the speed changed dramatically. Figure 3 At the middle section, the velocity data measured at the initial measuring point is compared with the complete velocity distribution on the middle section. It can be seen that the flow characteristics in some places cannot be captured, and the velocity changes in some places are relatively uniform. The number of measuring points can be appropriately reduced. Figure 4 It is the velocity information in the flow field measured by the secondary layout after setting reasonable upper and lower thresholds and minimum values. It can be found that after the optimized arrangement of the measuring points, the measuring point data can basically reflect the velocity change trend and characteristics in the flow field. Figure 5 Comparing the velocity data of the initial measurement point along the flow direction near the top of the blade with the complete velocity distribution, it can be seen that the velocity characteristics of some places are still not captured. After the secondary layout, the measurement point data is as follows: Figure 6 As shown, these characteristics are well reflected. Therefore, placing more measurement points in areas with large velocity variations can better capture parameter changes; appropriately reducing measurement points in areas with small velocity variations can also minimize measurement errors. Choosing an appropriate lower threshold can generate fewer measurement points without affecting the flow characteristics; while selecting an appropriate upper threshold ensures that parameter changes within the flow field are captured even in areas with drastic velocity changes.

[0119] In response to the current empirical and fuzzy arrangement of measurement points of five-hole probes in flow fields with drastic velocity changes, this paper proposes a systematic secondary layout method, which can rationally plan and layout the number and location of measurement points in flow fields with drastic velocity changes. That is, it provides an iterative method for adding and deleting specific locations of measurement points based on the flow field data obtained from the initial uniform layout; it proposes measurement point judgment parameters to quantify the encrypted location of measurement points, and proposes a minimum measurement point spacing x considering actual conditions. min , when the calculated spacing x t,i Less than xmin The actual threshold is magnified, the requirements for flow field measurement are relaxed, and the practicality is strong. The present invention proposes a method for quantitatively and accurately describing the probe position by processing the flow field information data of the initial layout probe, thereby realizing a layout scheme for more accurate measurement of flow information with drastic flow velocity changes.

[0120] The present invention uses preliminary flow field measurement results to determine the need for additional measurement points. The spacing between measurement points is used as a criterion. When the measurement point density is high, the velocity gradient is used as a judgment parameter. The gradient most intuitively describes the speed of airflow acceleration changes near the measurement point and is a very important reference indicator in flow fields with drastic velocity variations. When the measurement point density is insufficient and the calculation of the velocity gradient is meaningless, the first-order velocity difference is used as a judgment parameter. This parameter indicates the absolute magnitude of velocity changes around the measurement point and provides a certain reference value, making it also a judgment parameter. Subsequently, to eliminate the influence of the indicator dimension and the adverse effects caused by singular sample data, the present invention selects normalization processing for the judgment parameter, which more intuitively reflects the velocity changes. Because the fluctuation range between the maximum and minimum velocity values ​​in flow fields with drastic velocity variations is large, the judgment parameter is processed using the inverse tangent function, which is relatively less sensitive to extreme values. Additional measurement points are added to specific areas of the flow field, and secondary measurements are performed to obtain more accurate and reliable parameter changes and flow characteristics. The purpose of effectively avoiding the loss of flow information and obtaining more complete flow field information is achieved.

[0121] Example 2

[0122] In order to execute the method corresponding to the above embodiment 1 and achieve the corresponding functions and technical effects, a probe measurement point layout system for flow field measurement is provided below, including:

[0123] The initial measurement point sequence acquisition module is used to acquire an initial measurement point sequence. Multiple measurement points in the initial measurement point sequence are all located in the flow field to be measured.

[0124] The rough velocity determination module is used to obtain the rough velocity at each measuring point in the flow field to be measured.

[0125] The iterative initialization module is used to determine the initial measurement point sequence as the measurement point sequence when the iteration is 0.

[0126] The current measuring point determination module is used to determine the first measuring point in the initial measuring point sequence as the current measuring point.

[0127] The current adjacent measuring point module is used to determine the next measuring point of the current measuring point as the current adjacent measuring point.

[0128] The current judgment parameter module is used to determine the current judgment parameter according to the rough measured speed at the current measuring point and the rough measured speed at the current adjacent measuring point, as well as the distance between the current measuring point and the current adjacent measuring point.

[0129] The measuring point sequence updating module is used to update the measuring point sequence of the previous iteration according to the current judgment parameters to obtain the measuring point sequence of this iteration.

[0130] The optimal probe measuring point layout module is used to take the current adjacent measuring point as the current measuring point and return to the step of "determining that the next measuring point of the current measuring point is the current adjacent measuring point" until the initial measuring point sequence is traversed, and the measuring point sequence at this iteration is determined to be the optimal probe measuring point layout for the flow field to be measured.

[0131] Example 3

[0132] This embodiment provides an electronic device, including a memory and a processor. The memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to implement the probe measurement point layout method for flow field measurement described in Example 1.

[0133] The memory is a readable storage medium.

[0134] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0135] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A probe measurement point layout method for flow field measurement, characterized in that: include: Get the initial measurement point sequence; The multiple measuring points in the initial measuring point sequence are all located in the flow field to be measured; Obtain the rough velocity at each measuring point in the flow field to be measured; Determine that the initial measurement point sequence is the measurement point sequence at 0 iterations; Determine the first measuring point in the initial measuring point sequence as the current measuring point; Determine that the next measuring point of the current measuring point is the current adjacent measuring point; Determine the current judgment parameter according to the rough measured speed at the current measuring point, the rough measured speed at the current adjacent measuring point, and the distance between the current measuring point and the current adjacent measuring point; Update the measurement point sequence of the previous iteration according to the current judgment parameter to obtain the measurement point sequence of this iteration; The current adjacent measuring point is used as the current measuring point, and the process returns to step "determining the next measuring point of the current measuring point as the current adjacent measuring point" until the initial measuring point sequence is traversed, and the measuring point sequence at this iteration is determined to be the optimal probe measuring point layout for the flow field to be measured. The measurement point sequence of the previous iteration is updated according to the current judgment parameter to obtain the measurement point sequence of the current iteration, including: Determine whether the current judgment parameter is less than the judgment parameter lower limit, and obtain a second judgment result; If the second judgment result is yes, the current measuring point is deleted to obtain the measuring point sequence for this iteration; If the second judgment result is no, determine whether the current judgment parameter is less than the upper limit of the first judgment parameter to obtain a third judgment result; If the third judgment result is yes, determining the measurement point sequence in the previous iteration as the measurement point sequence in the current iteration; If the third judgment result is no, determining the interval between the current measuring point and the current adjacent measuring point as the current interval; Perform measurement point interpolation processing within the current interval to obtain the measurement point sequence for this iteration; Perform point interpolation processing within the current interval, including: Obtaining a second judgment parameter upper limit and a minimum measurement distance; the minimum measurement distance is determined according to the size of the speed measurement device; Determine the product of the second judgment parameter upper limit and the current interval distance as an intermediate value; Determine the absolute value of the ratio of the intermediate quantity to the current judgment parameter as the undetermined theoretical distance; Determine whether the undetermined theoretical distance is less than the minimum measurement distance to obtain a fourth determination result; If the fourth judgment result is yes, determining that the minimum measured distance is the theoretical distance; If the fourth judgment result is no, determining the undetermined theoretical distance as the theoretical distance; Rounding up the ratio of the current spacing distance to the theoretical spacing distance to obtain an equal fraction; Divide the current interval into equal parts according to the equal number of equal parts, and add a measurement point at each equal division point.

2. The probe measurement point layout method for flow field measurement according to claim 1, characterized in that: After determining that the measurement point sequence in this iteration is the optimal probe measurement point layout for the flow field to be measured, the following steps are also included: Determining a fine measurement speed at each optimized measurement point in an optimal probe measurement point layout; the optimized measurement point is an element in the optimal probe measurement point layout; According to the detailed measured velocities at all optimized measuring points in the flow field to be measured, the flow diagram image of the flow field to be measured is determined.

3. The probe measurement point layout method for flow field measurement according to claim 2, characterized in that: The rough speed is measured by using a three-hole probe; The fine measurement speed is obtained by measuring using a five-hole probe.

4. The probe measurement point layout method for flow field measurement according to claim 1, characterized in that: According to the rough speed at the current measuring point and the rough speed at the current adjacent measuring point, as well as the distance between the current measuring point and the current adjacent measuring point, the current judgment parameters are determined, including: Determine the absolute value of the difference between the rough speed at the current adjacent measuring point and the rough speed at the current measuring point as the first-order difference of the speed; Determine the distance between the current measuring point and the current adjacent measuring point as the current interval distance; Determine whether the current interval distance is less than a distance threshold, and obtain a first determination result; If the first judgment result is yes, determining the first-order difference of the speed as the to-be-determined judgment parameter; If the first judgment result is no, then the ratio of the first-order difference of the speed to the current interval distance is determined as the to-be-determined judgment parameter.

5. The probe measurement point layout method for flow field measurement according to claim 4, characterized in that: After determining the ratio of the first-order difference of the velocity to the current interval distance as the to-be-determined judgment parameter, the following steps are also included: The inverse tangent function is used to normalize the pending judgment parameters to obtain the current judgment parameters.

6. A probe measurement point layout system for flow field measurement, characterized in that: The probe measuring point layout system for flow field measurement applies the probe measuring point layout method for flow field measurement according to any one of claims 1 to 5, and the probe measuring point layout system for flow field measurement includes: An initial measurement point sequence acquisition module is used to acquire an initial measurement point sequence; multiple measurement points in the initial measurement point sequence are all located in the flow field to be measured; A rough velocity determination module is used to obtain the rough velocity at each measuring point in the flow field to be measured; Iterative initialization module, used to determine the initial measurement point sequence is the measurement point sequence when the iteration is 0; The current measuring point determination module is used to determine the first measuring point in the initial measuring point sequence as the current measuring point; The current adjacent measuring point module is used to determine the next measuring point of the current measuring point as the current adjacent measuring point; A current judgment parameter module is used to determine the current judgment parameter according to the rough measured speed at the current measuring point and the rough measured speed at the current adjacent measuring point, as well as the distance between the current measuring point and the current adjacent measuring point; A measuring point sequence updating module is used to update the measuring point sequence of the previous iteration according to the current judgment parameter to obtain the measuring point sequence of the current iteration; The optimal probe measuring point layout module is used to take the current adjacent measuring point as the current measuring point and return to the step of "determining the next measuring point of the current measuring point as the current adjacent measuring point" until the initial measuring point sequence is traversed, and the measuring point sequence at this iteration is determined to be the optimal probe measuring point layout for the flow field to be measured.

7. An electronic device, characterized in that: The electronic device comprises a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute a probe measurement point layout method for flow field measurement according to any one of claims 1 to 5.

8. The electronic device according to claim 7, characterized in that: The memory is a readable storage medium.

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