Engine multi-diffuser front compression component outlet adjustable stator blade and design method thereof

Abstract

The application belongs to the technical field of adjustable stator blade design of engine compression components, and particularly relates to an engine multi-cascade front compression component outlet adjustable stator blade and a design method thereof, which comprises the following steps: performing numerical simulation on the front compression component and the rear compression component to obtain the split flow lines of the front compression component under a large-bypass-ratio working condition and a small-bypass-ratio working condition; and improving the blade profile of the front compression component outlet adjustable stator blade to change the outlet pre-whirl angle between the split flow lines of the front compression component under the large-bypass-ratio working condition and the split flow lines of the front compression component under the small-bypass-ratio working condition, so as to improve the sensitivity of the front compression component outlet adjustable stator blade adjustment angle to the air flow entering the inner cascade under the small-bypass-ratio working condition.

Description

Technical Field

[0001] This application belongs to the technical field of adjustable stator blade design for engine compression components, specifically relating to an adjustable stator blade at the outlet of a multi-duct front compression component of an engine and its design method. Background Technology

[0002] In multi-bypass engines, the stator blades at the outlet of the front compression component are often designed as adjustable blades. This allows for different intake angles to be provided to the rear compression component by adjusting the angle of the adjustable stator blades at the outlet, thereby changing the airflow into the rear compression component and achieving the bypass ratio adjustment function. For example, by designing the stator blades at the outlet of the front fan as adjustable blades, different intake angles can be provided to the rear fan by adjusting the angle of the adjustable stator blades at the outlet of the front split fan, thereby changing the airflow into the rear fan and achieving the bypass ratio adjustment function.

[0003] The adjustment of the angle of the adjustable stator blade at the outlet of the front compression component will affect the performance of the front compression component. Currently, the adjustable stator blade at the outlet of the front compression component designed using conventional design technology is adapted to both high bypass ratio and low bypass ratio operating conditions. However, it requires a large angle adjustment range, which will seriously affect the performance of the front compression component and severely limit the development of engine technology.

[0004] This application is made in view of the aforementioned technical deficiencies. Summary of the Invention

[0005] The purpose of this application is to provide an adjustable stator blade at the outlet of a multi-ducted front compression component of an engine and a design method thereof, so as to overcome or mitigate at least one of the known technical defects.

[0006] The technical solution of this application is:

[0007] One aspect provides a design method for adjustable stator blades at the outlet of a multi-bypass inlet compression component of an engine, including:

[0008] Numerical simulations were performed on the front and rear compression components to obtain the flow lines of the front compression component under high bypass ratio and low bypass ratio conditions.

[0009] The airfoil of the adjustable stator blade at the outlet of the front compression component is improved. The outlet pre-swirl angle between the flow split streamline of the front compression component under high bypass ratio and low bypass ratio conditions is changed to improve the sensitivity of the adjustable stator blade at the outlet of the front compression component to the airflow entering the inner duct under low bypass ratio conditions.

[0010] Optionally, in the above-mentioned design method for adjustable stator blades at the outlet of the multi-duct front compression component of an engine, the front compression component is a front fan;

[0011] The rear compression component is a rear fan.

[0012] Optionally, in the above-mentioned design method for adjustable stator blades at the outlet of the multi-bypass front compression component of the engine, the flow line of the front compression component under high bypass ratio conditions is in the range of 0.335~0.45 blade height.

[0013] Under low bypass ratio conditions, the flow line of the front compression component is in the range of 0.85~0.95 blade height.

[0014] Optionally, in the above-mentioned design method for the adjustable stator blade at the outlet of the multi-bypass front compression component of the engine, the change in the outlet pre-rotation angle between the flow lines of the front compression component under high bypass ratio conditions and under low bypass ratio conditions is specifically achieved by deviating the outlet pre-rotation angle between the flow lines of the front compression component under high bypass ratio conditions and under low bypass ratio conditions by 3~4° towards the blade back direction.

[0015] On the other hand, an adjustable stator blade for the outlet of a multi-bypass front compression component of an engine is provided, which is designed using the aforementioned design method for an adjustable stator blade for the outlet of a multi-bypass front compression component of an engine.

[0016] This application has at least the following beneficial technical effects:

[0017] The adjustable stator blade at the outlet of the multi-duct front compression component of the engine disclosed in the above embodiments and its design method result in an adjustable stator blade at the outlet of the front compression component that can be adjusted within a small angle range to adapt to high bypass ratio and low bypass ratio operating conditions, thereby reducing the impact on the performance of the front compression component and effectively balancing the needs for both the impact on the performance of the front compression component and the bypass ratio adjustment capability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the flow splitting streamline of the front compression component under high bypass ratio and low bypass ratio conditions, obtained by numerical simulation of the front compression component and the rear compression component according to the embodiments of this application.

[0019] Figure 2 This is a schematic diagram of the adjustable stator blade configuration at the outlet of the multi-duct front compression component of an engine provided in an embodiment of this application;

[0020] Figure 3 This is a schematic diagram of the distribution of the outlet pre-spin angle of the adjustable stator blade at the outlet of the multi-duct front compression component of an engine along the blade height, provided in an embodiment of this application.

[0021] in:

[0022] 1-Front compression component; 2-Rear compression component; 3-Adjustable stator blade at outlet;

[0023] 4- Streamline of the front compression component under low bypass ratio conditions;

[0024] 5. Streamline of the front compression component under high bypass ratio conditions;

[0025] 6-Outer bypass duct;

[0026] 7. The Meaning of Tao.

[0027] To better illustrate this embodiment, some content in the accompanying drawings may be omitted, enlarged, or reduced. They are for illustrative purposes only and should not be construed as limiting the scope of this application. Detailed Implementation

[0028] To make the technical solution and advantages of this application clearer, the technical solution of this application will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this application, and are only used to explain this application, not to limit this application. It should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, and other related parts can be referred to the general design.

[0029] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The word "comprising" as used in this application description indicates that the concept preceding the word encompasses the concepts listed following the word and their equivalents, without excluding other related concepts.

[0030] One aspect of this application provides a design method for adjustable stator blades at the outlet of a multi-ducted front compression component of an engine.

[0031] Based on the adjustable stator blades at the outlet of the front compression component obtained from the current design, numerical simulations were performed on the front and rear compression components to obtain the flow lines of the front compression component under high bypass ratio and low bypass ratio conditions.

[0032] In a specific example, numerical simulations were performed on the front and rear compression components to obtain the flow lines of the front compression component under high bypass ratio and low bypass ratio conditions, such as... Figure 1As shown, the airflow above the split streamline enters the outer bypass duct 6, and the airflow below enters the inner bypass duct 7. Therefore, under low bypass ratio conditions, the airflow entering the inner bypass duct 7 is related to the stator outlet airflow angle below the split streamline 4 of the front compression component under low bypass ratio conditions. Under high bypass ratio conditions, the airflow entering the inner bypass duct 7 is related to the stator outlet airflow angle below the split streamline 5 of the front compression component under high bypass ratio conditions. Therefore, the outlet airflow angle of the shaded area between the split streamline 4 of the front compression component under low bypass ratio conditions and the split streamline 5 of the front compression component under high bypass ratio conditions only affects the airflow entering the inner bypass duct 7 under low bypass ratio conditions, and has no effect on the airflow entering the inner bypass duct 7 under high bypass ratio conditions.

[0033] Under high bypass ratio conditions, the flow split line of the front compression component is typically in the range of 0.35 to 0.45 blade height, while under low bypass ratio conditions, the flow split line of the front compression component is typically in the range of 0.85 to 0.95 blade height.

[0034] The airfoil of the adjustable stator blade at the outlet of the front compression component is improved, changing the outlet pre-swirl angle between the flow split streamline of the front compression component under high bypass ratio conditions and under low bypass ratio conditions. Figure 1 The pre-rotation angle of the adjustable stator blades at the outlet in the shaded area is shown to improve the sensitivity of the adjustable stator blade adjustment angle of the front compressor component to the airflow entering the inner duct under low bypass ratio conditions. In this way, under high bypass ratio conditions, the airflow entering the inner duct remains unchanged after adjusting the adjustable stator blade angle of the front compressor component to the correct position. Under low bypass ratio conditions, to keep the airflow entering the inner duct constant, only a smaller angle adjustment of the adjustable stator blades at the outlet of the front compressor component is needed. This allows for a smaller angle adjustment range to adapt to both high and low bypass ratio conditions, reducing the impact on the performance of the front compressor component.

[0035] The change in the outlet pre-rotation angle of the adjustable stator blade at the outlet of the front compression component under high bypass ratio and low bypass ratio conditions is selected by comprehensively considering the bypass ratio adjustment requirements and the performance of the front compression component. Typically, the outlet pre-rotation angle of the adjustable stator blade at the outlet of the front compression component is deviated by 3~4° towards the blade back direction.

[0036] Another aspect of this application provides an adjustable stator blade at the outlet of a multi-bypass engine front compression component, designed using the adjustable stator blade design method for the multi-bypass engine front compression component disclosed in the above embodiments. Its configuration is as follows: Figure 2 As shown, the distribution of the exit pre-rotation angle along the blade height is as follows: Figure 3As shown.

[0037] The adjustable stator blades at the outlet of the multi-duct front compression component of the engine disclosed in the above embodiments and their design method improve the ability to adjust the bypass ratio by adjusting the outlet pre-rotation angle of the flow regulation sensitive area of ​​the adjustable stator blades at the outlet of the front compression component. It can adapt to high bypass ratio and low bypass ratio operating conditions with a small angle adjustment range, reduce the impact on the performance of the front compression component, and well balance the needs of both the impact on the performance of the front compression component and the bypass ratio adjustment capability. Moreover, it can be designed to maintain a smaller radial clearance of the adjustable blades, which is beneficial to the improvement of the performance of the front compression component and the engine as a whole.

[0038] The technical solution of this application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A design method for adjustable stator blades at the outlet of a multi-ducted front compression component of an engine, characterized in that, include: Numerical simulations were performed on the front and rear compression components to obtain the flow lines of the front compression component under high bypass ratio and low bypass ratio conditions. The airfoil of the adjustable stator blade at the outlet of the front compression component is improved, and the outlet pre-rotation angle between the flow lines of the front compression component under high bypass ratio and low bypass ratio conditions is changed to improve the sensitivity of the adjustable stator blade at the outlet of the front compression component to the airflow entering the inner duct under low bypass ratio conditions. The front compression component is a front fan; The rear compression component is a rear fan; The change in the outlet pre-rotation angle between the flow lines of the front compression component under high bypass ratio and low bypass ratio conditions is specifically achieved by shifting the outlet pre-rotation angle of the adjustable stator blade at the outlet of the front compression component by 3-4° towards the blade back direction.

2. The design method for adjustable stator blades at the outlet of the multi-ducted front compression component of an engine according to claim 1, characterized in that, Under high bypass ratio conditions, the flow line of the front compression component is in the range of 0.35 to 0.45 blade height. Under low bypass ratio conditions, the flow line of the front compression component is in the range of 0.85~0.95 blade height.

3. An adjustable stator blade at the outlet of a multi-duct front compression component of an engine, characterized in that, The design method is based on the adjustable stator blade design method for the outlet of the multi-duct front compression component of the engine as described in claim 1.

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