Simplified modeling method for calculating flow master fluid resistance of diesel engine set pipeline

Abstract

The invention discloses a simplified modeling method for calculating flow master fluid resistance of a diesel engine set pipeline. The simplified modeling method comprises a specific statement of problems existing in an original flow master modeling method, a simplified method of a new modeling method and an operation element and information input method. An original flowmaster modeling method is too low in efficiency, the number of components is too large, the mapping relation between the original flowmaster modeling method and a flow chart cannot be visually achieved, data input and subsequent maintenance are not facilitated, and input deviation is prone to occurring in actual operation due to the complexity of data transition; according to the novel flowmaster modeling method, the efficiency and the reliability are improved, meanwhile, the structure that a flowmaster calculation pipeline model is highly consistent with a flow chart is ensured, and the pressure and flow velocity calculation problems needing to be solved by an original flowmaster modeling method are also accurately and equivalently solved.

Description

Technical Field

[0001] This invention relates to the technical field of calculating fluid resistance in diesel engine pipelines. Specifically, it discloses a simplified modeling method for calculating fluid resistance based on Flowmaster software. This method is suitable for the design, analysis, and maintenance of complex piping systems, particularly for engineering scenarios requiring high modeling efficiency and visualization. Background Art

[0002] Currently, Flowmaster software is typically used to model the fluid resistance of diesel engine piping systems. Traditional methods require that all components (such as valves and elbows) and pipe sections in the pipeline be individually modeled, resulting in a complex model structure and a large number of components. This modeling approach presents the following issues:

[0003] Inefficiency: The data entry process is cumbersome and time-consuming, especially when dealing with complex piping systems, where a large number of parameters need to be entered, seriously affecting work efficiency.

[0004] Lack of reliability: Due to the huge amount of data entered, it is easy for deviations to be introduced due to human negligence or operational errors, affecting the accuracy of the calculation results.

[0005] Poor maintainability: When the piping system needs to be adjusted or updated, the modification and maintenance of the traditional model is extremely inconvenient, and it is difficult to quickly respond to design change requirements.

[0006] Visualization defects: The model structure is significantly different from the actual flowchart and lacks intuitiveness, which is not conducive to engineers to quickly understand and verify the design intent.

[0007] Existing technologies have not yet provided effective solutions to these problems. Therefore, a simplified modeling method is urgently needed that can improve modeling efficiency, reliability, and maintainability while ensuring computational accuracy, while achieving high consistency between the model and the flowchart. Summary of the Invention

[0008] To address the various problems of the current Flowmaster modeling method, such as low efficiency, poor reliability, poor maintainability, lack of intuitiveness, and even chaotic structure, the present invention proposes a simplified modeling method for fluid resistance calculation based on Flowmaster software. By optimizing the modeling process and reducing redundant information entry, the efficiency and reliability of flow resistance calculation of the diesel engine unit piping system are improved, while ensuring that the model structure is highly consistent with the flow chart.

[0009] The technical solution adopted in the present invention is:

[0010] A simplified modeling method for calculating Flowmaster fluid resistance in diesel engine pipelines is characterized by comprising the following steps:

[0011] Obtain information from the 3D pipeline model, including the total length of the pipeline, the coordinates of the first and last points of the pipeline, the coordinates of the lowest point of the pipeline, and the types and quantities of pipeline components;

[0012] Using the resistance coefficient method, the entire pipeline is equivalent to two sections of pipelines, each of which contains a pipeline element and a resistance element;

[0013] Establish a pipeline model in the order of "starting point, first pipeline element, first resistance element, intermediate node, second pipeline element, second resistance element, and end point";

[0014] When entering data, the coordinates of the starting and ending points are directly extracted from the 3D pipeline model, and the coordinates of the middle point are taken from the lowest point of the entire pipeline;

[0015] The total length of the pipeline elements of the two sections of the pipeline is equal to the actual total length of the pipeline, and the total resistance loss coefficient of the pipeline resistance elements at both ends of the pipeline is equal to the sum of the resistance loss coefficients of all non-pipeline elements of the pipeline.

[0016] Furthermore, the resistance coefficient method calculates the total length of the pipeline, the total resistance coefficient of non-pipeline elements and the coordinates of the lowest point to achieve overall equivalent modeling.

[0017] Furthermore, the non-pipeline elements include valves, elbows, tees, reducers and filters.

[0018] The present invention also provides a diesel engine unit pipeline optimization design method, which is characterized in that the simplified modeling method is used to perform rapid iterative calculations, including:

[0019] (1) Establish an initial simplified model;

[0020] (2) Calculate flow resistance;

[0021] (3) Adjust the pipeline design according to the calculation results;

[0022] (4) Repeat steps (1)-(3) until the design requirements are met.

[0023] Furthermore, the design requirements include pressure drop limitations, flow rate ranges, and manufacturing cost constraints.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] Traditional Flowmaster modeling requires inputting the parameters of all pipeline components (such as valves, elbows, etc.) one by one, while the present invention only needs to extract limited information such as the total length of the pipeline, component type, number of components, coordinates of the first and last points, and coordinates of the lowest point, greatly reducing the amount of data entry.

[0026] The resistance coefficient method is used to calculate the flow resistance of a complex pipeline equivalent to two sections of pipeline (each section contains a pipeline element and a resistance element), which significantly reduces the modeling complexity.

[0027] Using a holistic equivalent modeling approach, the calculated results (such as pressure drop and flow rate) are consistent with the actual pipeline and are unaffected by the order of component arrangement. Due to the standardized modeling process, the calculation convergence is improved, making it suitable for rapid simulation analysis of complex diesel engine pipeline systems. DETAILED DESCRIPTION

[0028] The simplified modeling method for calculating the Flowmaster fluid resistance of the diesel engine pipeline of the present invention is mainly implemented by the following steps:

[0029] S1. Pipeline information acquisition

[0030] Before modeling each pipeline segment, no matter how complex the structure, only the following key information is extracted from the 3D model:

[0031] Total length of pipeline L: the overall length of the pipeline from the starting point to the end point.

[0032] Coordinates of the starting and ending points of the pipeline (X1, Y1, Z1) and (X2, Y2, Z2): Define the starting and ending positions of the pipeline in three-dimensional space and determine the direction of the pipeline in space.

[0033] Coordinates of the lowest point of the pipeline (X m ,Y m ,Z m ): Find the lowest point of the pipeline in three-dimensional space;

[0034] Types of piping components: Different types of components included in the pipeline, such as valves, elbows, tees, etc.

[0035] Number of pipeline components N: Count the specific number of various pipeline components in the pipeline.

[0036] Resistance coefficient ξ of each non-pipe component i ;

[0037] Total drag coefficient ξ1+ξ2+......+ξ N :

[0038] S2. Pipeline segment modeling

[0039] Create a new project in Flowmaster software, selecting the appropriate fluid medium and calculation unit system.

[0040] Each branch pipe carries a pipe element and a resistance element;

[0041] The main pipeline is connected in the order of "starting point-pipeline element-resistance element-intermediate point-pipeline element-resistance element-end point" to construct a simplified pipeline model, in which the flow characteristics of the actual pipeline are simulated through the combination of pipe elements and resistance elements.

[0042] S3. Data Entry

[0043] The coordinates of the starting point and the end point are directly obtained from the 3D pipeline model, and the coordinates of the middle point are taken from the lowest point of the entire pipeline.

[0044] The total length of the pipe elements of the two pipeline sections is equal to the actual total length of the pipeline.

[0045] The resistance loss coefficient of the pipeline resistance elements at both ends of the pipeline is equal to the sum of the resistance loss coefficients of all components of the pipeline except the pipeline.

[0046] Working Principle: Based on the resistance coefficient method, this method only calculates the total length of the pipeline, the resistance coefficients of all non-pipeline components, the number of non-pipeline components, and the coordinates of the lowest point. The complex structure of the actual pipeline is then transformed into a simplified model. This method ensures that the maximum pressure drop and flow rate in the pipeline are equivalent to those in the actual pipeline, regardless of the order of the components.

[0047] Take the fuel supply system of a diesel generator set as an example:

[0048] (1) Pipeline parameters:

[0049] Total length L = 8.5m

[0050] Contains 3 90° elbows (ξ=0.3), 2 gate valves (ξ=0.15)

[0051] Total drag coefficient ξ=3×0.3+2×0.15=1.2

[0052] (2) Model establishment:

[0053] Set L1 = L2 = 4.25m

[0054] Set ξ1=ξ2=0.6

[0055] The middle node is Z = 1.2m (the lowest point of the pipeline)

[0056] (3) Verification of calculation results:

[0057] Simplified model pressure drop ΔP_model=35.2kPa

[0058] Detailed model pressure drop ΔP_detail=36.8kPa

[0059] The error is 4.3%, meeting the engineering requirements

[0060] This embodiment illustrates the practical application process of the present invention through specific cases. Those skilled in the art can make appropriate adjustments to the method according to actual needs, and these adjustments should be included in the scope of protection of the present invention.

Claims

1. A simplified modeling method for calculating the Flowmaster fluid resistance of diesel engine pipelines, characterized in that: The following steps are involved: Obtain information from the 3D pipeline model, including the total length of the pipeline, the coordinates of the first and last points of the pipeline, the coordinates of the lowest point of the pipeline, and the types and quantities of pipeline components; Using the resistance coefficient method, the entire pipeline is equivalent to two sections of pipelines, each of which contains a pipeline element and a resistance element; Establish the pipeline model in the order of "starting point, first pipeline element, first resistance element, intermediate node, second pipeline element, second resistance element, and end point"; When entering data, the coordinates of the starting and ending points are directly extracted from the 3D pipeline model, and the coordinates of the middle point are taken from the lowest point of the entire pipeline; The total length of the pipeline elements of the two sections of the pipeline is equal to the actual total length of the pipeline, and the total resistance loss coefficient of the pipeline resistance elements at both ends of the pipeline is equal to the sum of the resistance loss coefficients of all non-pipeline elements of the pipeline.

2. The simplified modeling method according to claim 1, characterized in that: The resistance coefficient method calculates the total length of the pipeline, the total resistance coefficient of non-pipeline elements and the coordinates of the lowest point to achieve overall equivalent modeling.

3. The simplified modeling method according to claim 1, characterized in that: The non-pipeline components include valves, elbows, tees, reducers and filters.

4. A diesel engine pipeline optimization design method, characterized in that: The simplified modeling method according to any one of claims 1 to 3 is used to perform rapid iterative calculations, comprising: (1) Establish an initial simplified model; (2) Calculate flow resistance; (3) Adjust the pipeline design according to the calculation results; (4) Repeat steps (1)-(3) until the design requirements are met.

5. The method according to claim 4, characterized in that The design requirements include pressure drop limitations, flow rate ranges, and manufacturing cost constraints.