CN114544180A - Engine large throttle evaluation method and device - Google Patents

Abstract

The application belongs to the field of engine design, and particularly relates to an engine throttle assessment method and device. The method comprises the steps of S1, obtaining a plurality of discrete point coordinates formed by each time point and a thrust ratio parameter under the time point, wherein the thrust ratio parameter is the ratio of thrust corresponding to each time point to intermediate thrust of the engine given based on the large throttle thrust characteristic of the engine; step S2, connecting the discrete points according to time sequence to form a plurality of line segments, and taking the slope of each line segment as a reference slope; step S3, acquiring the engine thrust of each time point in the process of large throttle acceleration of the engine, and calculating the actual ratio of the engine thrust of each time point to the intermediate thrust; step S4, determining a plurality of slopes as actual slopes according to the actual ratios of adjacent time points; and step S5, evaluating the throttle valve characteristic of the engine according to the actual slope and the reference slope. The method is more accurate and effective in evaluating the acceleration characteristic of the large throttle of a new research and development motivation.

Description

Method and device for evaluating large throttle of engine

technical field

The application belongs to the field of engine design, and in particular relates to a method and device for evaluating a large throttle of an engine.

Background technique

The large throttle characteristics of conventional carrier-based aircraft engines describe the acceleration characteristics of the engine by testing the curve of thrust and time. Generally, the relationship between time and thrust from the throttle state of the engine to the intermediate state is specified. The engine needs to be inspected before leaving the factory. The large throttle characteristics of each engine need not be lower than the characteristics in the curve before leaving the factory. The schematic diagram is shown in Figure 1. The above conventional engine acceleration evaluation methods mainly rely on a fixed time limit to evaluate the large and small throttle characteristics. The essence of the acceleration and deceleration characteristics of the engine is the slope of the thrust-time curve, that is to say, the larger the slope, the steeper the curve, the better the acceleration and deceleration performance, the smaller the slope, the slower the curve, and the better the acceleration and deceleration performance. Difference. At the same time, the curves of each type of engine are not the same, and horizontal comparison cannot be achieved.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present application provides a method and device for evaluating the large throttle of an engine, that is, the slope of the thrust changing with time is used as a method for evaluating the engine of a carrier aircraft, and at the same time, the standard is unified, and the thrust percentage is used to compare the horizontal comparison of different engines. Accelerate performance.

A first aspect of the present application provides an engine large throttle evaluation method, which mainly includes:

Step S1, obtain a plurality of discrete point coordinates formed by each time point and the thrust ratio parameter under this time point, and the thrust ratio parameter is the thrust and the engine corresponding to each said time point given based on the thrust characteristics of the engine high throttle. Ratio of intermediate thrust;

Step S2, connecting the discrete points in time sequence to form a plurality of line segments, and taking the slope of each line segment as a reference slope;

Step S3, obtaining the engine thrust at each described time point during the acceleration of the engine with a large accelerator, and calculating the actual ratio of the engine thrust at each time point to the intermediate thrust;

Step S4, determining a plurality of slopes as actual slopes according to the actual ratios at each adjacent time point;

Step S5: Evaluate the engine large throttle characteristic according to the actual slope and the reference slope.

Preferably, in step S1, the number of discrete point coordinates is at least 10.

Preferably, after step S2, the method further includes laterally evaluating the large throttle characteristics of different engines according to the reference slope.

Preferably, in step S5, evaluating the characteristics of the large throttle of the engine includes:

Determine the number of times that the actual slope is greater than the reference slope during the acceleration process of the large throttle;

If the number accounts for 80% of the number of all reference slopes, it is considered that the acceleration performance of the engine at a large throttle meets the design requirements.

A second aspect of the present application provides an engine large throttle evaluation device, which mainly includes:

The coordinate point acquisition module is used to acquire a plurality of discrete point coordinates composed of each time point and the thrust ratio parameter at the time point, and the thrust ratio parameter is corresponding to each of the time points given based on the thrust characteristics of the large throttle of the engine The ratio of thrust to the intermediate thrust of the engine;

The reference slope calculation module is used to connect discrete points in time sequence to form multiple line segments, and the slope of each line segment is used as the reference slope;

The engine state acquisition module is used to acquire the engine thrust at each said time point during the acceleration process of the engine with a large throttle, and calculate the actual ratio of the engine thrust at each time point to the intermediate thrust;

an actual slope calculation module, configured to determine a plurality of slopes as actual slopes according to the actual ratios at adjacent time points;

The engine large throttle characteristic evaluation module is used for evaluating the engine large throttle characteristic according to the actual slope and the reference slope.

Preferably, in the coordinate point acquiring module, the number of coordinates of the discrete points is at least 10.

Preferably, the engine large throttle evaluation device further includes:

The lateral evaluation module is used to laterally evaluate the large throttle characteristics of different engines according to the reference slope.

Preferably, the engine large throttle characteristic evaluation module includes:

The comparison unit is used to determine the number that the actual slope is greater than the reference slope during the acceleration process of the large throttle;

The evaluation unit is configured to consider that the acceleration performance of the engine at a large accelerator meets the design requirements when the number accounts for 80% of the number of all reference slopes.

This application can be used for the evaluation of the large throttle of the newly developed engine, and the thrust ratio standard is unified, so that the large throttle characteristics of different engines can be compared horizontally. Therefore, it is more objective, more effective, and more widely used to constrain the characteristics of the size and throttle of the carrier-based aircraft engine with this method.

Description of drawings

FIG. 1 is a schematic diagram of a large throttle characteristic curve of an existing engine.

FIG. 2 is a flowchart of a preferred embodiment of the method for evaluating the large throttle of an engine according to the present application.

FIG. 3 is a schematic diagram of a large throttle characteristic curve of the embodiment shown in FIG. 2 of the present application.

Detailed ways

In order to make the objectives, technical solutions and advantages of the implementation of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. Throughout the drawings, the same or similar reference numbers refer to the same or similar elements or elements having the same or similar functions. The described embodiments are some, but not all, embodiments of the present application. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to be used to explain the present application, but should not be construed as a limitation to the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

A first aspect of the present application provides a method for evaluating a large throttle of an engine, as shown in FIG. 2 , which mainly includes:

Step S1, obtain a plurality of discrete point coordinates formed by each time point and the thrust ratio parameter under this time point, and the thrust ratio parameter is the thrust and the engine corresponding to each said time point given based on the thrust characteristics of the engine high throttle. Ratio of intermediate thrust;

Step S2, connecting the discrete points in time sequence to form a plurality of line segments, and taking the slope of each line segment as a reference slope;

Step S3, obtaining the engine thrust at each described time point during the acceleration of the engine with a large accelerator, and calculating the actual ratio of the engine thrust at each time point to the intermediate thrust;

Step S4, determining a plurality of slopes as actual slopes according to the actual ratios at each adjacent time point;

Step S5: Evaluate the engine high throttle characteristic according to the actual slope and the reference slope.

The present application can form a new slope-based high-throttle evaluation method based on the existing large-throttle evaluation characteristics of the engine, so that the evaluation of the large-acceleration characteristics of the newly developed engine is more accurate and effective.

In some optional embodiments, in step S1, the number of the discrete point coordinates is at least ten.

In some optional implementations, step S2 further includes laterally evaluating the large throttle characteristics of different engines according to the reference slope.

In some optional implementations, evaluating engine high-throttle characteristics includes:

Determine the number of times that the actual slope is greater than the reference slope during the acceleration process of the large throttle;

If the number accounts for 80% of the number of all reference slopes, it is considered that the acceleration performance of the engine at a large throttle meets the design requirements.

In this application, the ratio of thrust to intermediate state thrust is used as the ordinate, so that standard normalization can be achieved, that is, the large throttle characteristic curves of all engines can be compared horizontally. Afterwards, the slope (K1, K2, K3, , Kn) of each small segment of the curve is used as an evaluation method to constrain the engine's large throttle characteristics. An example is shown in Figure 3.

This new evaluation method of the large throttle of the carrier-based aircraft engine more objectively reflects the essence of acceleration: the slope, and at the same time, the thrust ratio standard is unified, so that the large throttle characteristics of different engines can be compared horizontally. Therefore, it is more objective, more effective, and more widely used to constrain the characteristics of the size and throttle of the carrier-based aircraft engine with this method.

A second aspect of the present application provides an engine large throttle evaluation device corresponding to the above method, which mainly includes:

The coordinate point acquisition module is used to acquire a plurality of discrete point coordinates composed of each time point and the thrust ratio parameter at the time point, and the thrust ratio parameter is corresponding to each of the time points given based on the thrust characteristics of the large throttle of the engine The ratio of thrust to the intermediate thrust of the engine;

The reference slope calculation module is used to connect discrete points in time sequence to form multiple line segments, and the slope of each line segment is used as the reference slope;

The engine state acquisition module is used to acquire the engine thrust at each said time point during the acceleration process of the engine with a large throttle, and calculate the actual ratio of the engine thrust at each time point to the intermediate thrust;

an actual slope calculation module, configured to determine a plurality of slopes as actual slopes according to the actual ratios at adjacent time points;

The engine large throttle characteristic evaluation module is used for evaluating the engine large throttle characteristic according to the actual slope and the reference slope.

In some optional implementations, in the coordinate point obtaining module, the number of the discrete point coordinates is at least ten.

In some optional embodiments, the engine large throttle evaluation device further includes:

The lateral evaluation module is used to laterally evaluate the large throttle characteristics of different engines according to the reference slope.

In some optional embodiments, the engine large throttle characteristic evaluation module includes:

The comparison unit is used to determine the number that the actual slope is greater than the reference slope during the acceleration process of the large throttle;

The evaluation unit is configured to consider that the large-acceleration performance of the engine meets the design requirement when the number accounts for 80% of the number of all reference slopes.

Although the present application has been described in detail above with general description and specific embodiments, some modifications or improvements can be made on the basis of the present application, which will be obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present application fall within the scope of protection claimed in the present application.

Claims (8)

1. a method for evaluating a large throttle of an engine, is characterized in that, comprising: Step S1, obtain a plurality of discrete point coordinates formed by each time point and the thrust ratio parameter under this time point, and the thrust ratio parameter is the thrust and the engine corresponding to each said time point given based on the thrust characteristics of the engine high throttle. Ratio of intermediate thrust; Step S2, connecting the discrete points in time sequence to form a plurality of line segments, and taking the slope of each line segment as a reference slope; Step S3, obtaining the engine thrust at each described time point during the acceleration of the engine with a large accelerator, and calculating the actual ratio of the engine thrust at each time point to the intermediate thrust; Step S4, determining a plurality of slopes as actual slopes according to the actual ratios at each adjacent time point; Step S5: Evaluate the engine large throttle characteristic according to the actual slope and the reference slope. 2 . The method for evaluating engine large throttle according to claim 1 , wherein, in step S1 , the number of coordinates of the discrete points is at least 10. 3 . 3 . The method for evaluating the large throttle of an engine according to claim 1 , wherein after step S2 , the method further comprises laterally evaluating the large throttle characteristics of different engines according to the reference slope. 4 . 4. The method for evaluating the large throttle of an engine as claimed in claim 1, wherein in step S5, evaluating the large throttle characteristic of the engine comprises: Determine the number of times that the actual slope is greater than the reference slope during the acceleration process of the large throttle; If the number accounts for 80% of the number of all reference slopes, it is considered that the acceleration performance of the engine at a large throttle meets the design requirements. 5. A device for evaluating a large throttle of an engine, comprising: The coordinate point acquisition module is used to acquire a plurality of discrete point coordinates composed of each time point and the thrust ratio parameter at the time point, and the thrust ratio parameter is corresponding to each of the time points given based on the thrust characteristics of the large throttle of the engine The ratio of thrust to the intermediate thrust of the engine; The reference slope calculation module is used to connect discrete points in time sequence to form multiple line segments, and the slope of each line segment is used as the reference slope; The engine state acquisition module is used to acquire the engine thrust at each said time point during the acceleration process of the engine with a large throttle, and calculate the actual ratio of the engine thrust at each time point to the intermediate thrust; an actual slope calculation module, configured to determine a plurality of slopes as actual slopes according to the actual ratios at adjacent time points; The engine large throttle characteristic evaluation module is used for evaluating the engine large throttle characteristic according to the actual slope and the reference slope. 6 . The engine large throttle evaluation device according to claim 5 , wherein, in the coordinate point acquiring module, the number of coordinates of the discrete points is at least 10. 7 . 7. The device for evaluating large engine accelerators as claimed in claim 5, wherein the device for evaluating large engine accelerators further comprises: The lateral evaluation module is used to laterally evaluate the large throttle characteristics of different engines according to the reference slope. 8. The engine large throttle evaluation device according to claim 5, wherein the engine large throttle characteristic evaluation module comprises: The comparison unit is used to determine the number that the actual slope is greater than the reference slope during the acceleration process of the large throttle; The evaluation unit is configured to consider that the large-acceleration performance of the engine meets the design requirement when the number accounts for 80% of the number of all reference slopes.

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