基于脊背特征的发动机低转速特性扩展方法

王佳美; 郭迎清; 于华锋

doi:10.13700/j.bh.1001-5965.2021.0634

基于脊背特征的发动机低转速特性扩展方法

doi: 10.13700/j.bh.1001-5965.2021.0634

西北工业大学动力与能源学院，西安 710072

基金项目: 国家科技重大专项基金(J2019-Ⅴ-0003)

详细信息

通讯作者:
E-mail：yqguo@nwpu.edu.cn

中图分类号: V235.13；TB553
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- 文章访问数: 100
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- 被引次数: 0
出版历程
- 收稿日期: 2021-10-26
- 录用日期: 2022-01-14
- 网络出版日期: 2022-02-21
- 整期出版日期: 2023-10-01

Extension method of engine low speed characteristics based on backbone features

School of Power and Energy，Northwestern Polytechnical University，Xi’an 710072，China

Funds: National Science and Technology Major Project of China (J2019-Ⅴ-0003)

More Information

Corresponding author: E-mail：yqguo@nwpu.edu.cn

摘要

摘要:
旋转部件在高空低转速时，其工作状态受来流的吹动作用可能会发生变化，此时压气机处在特殊的“搅拌机”或“涡轮”工作状态，使得发动机的动态计算中效率插值出现不连续的问题。为解决此问题，采用美国国家航空航天局（NASA）和通用电气公司（GE）联合开发的针对旋转部件特性转化的脊背特征方法，通过分析低转速下旋转部件脊背特征及非脊背特征的变化趋势，提出基于脊背特征的旋转部件低转速范围特性的扩展方法，并有效规避了效率特性在低转速下插值的失效。以某型军用涡扇发动机为例，计算其处于不同飞行条件下的发动机风车工作状况，结果表明：所提方法能够反映出低转速下压气机压比小于1的特殊工作状态，且不同飞行条件下的风车特性计算合理。
- 低转速 /
- 效率 /
- 不连续 /
- 脊背点 /
- 非脊背点 /
- 风车
Abstract:
The blowing action of the incoming flow may cause the functioning state of the rotating components to alter when they operate at high altitudes but low speeds. The compressor is in a special “mixer” or “turbine” working state at such a condition, which makes a discontinuous change of efficiency during the dynamic operation of the engine. In order to solve this problem, the method based on the backbone features developed by National Aeronautics and Space Administration (NASA) and General Electric Company (GE) was used to transform the characteristics of rotating parts. It is possible to expand the low-speed range characteristics of rotating parts and successfully prevent the invalidation of the interpolation of efficiency characteristics at low speeds by studying the changing trends of the backbone and off-backbone features at low speeds. Taking a military turbofan engine as an example, the windmilling characteristics under different flight conditions are calculated. The results show that this method can reflect the special working conditions of the compressor with a pressure ratio of less than 1 at low speeds, and the calculation of windmilling characteristics under different flight conditions is reasonable.
- low speeds /
- efficiency /
- discontinuity /
- backbone /
- off-backbone /
- windmilling

HTML全文

图 1 压气机基元级转子速度三角形

Figure 1. Velocity triangle of compressor stage

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图 2 压气机脊背点的位置

Figure 2. The position of backbone point of compressor

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图 3 压气机的脊背点特性

Figure 3. The backbone characteristics of compressor

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图 4 压气机的非脊背点特性

Figure 4. The off-backbone characteristics of compressor

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图 5 涡轮的基元级转子速度三角形

Figure 5. Velocity triangle of turbine stage

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图 6 涡轮的脊背点特性

Figure 6. The backbone characteristics of turbine

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图 7 涡轮的非脊背点特性

Figure 7. The off-backbone characteristics of turbine

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图 8 涡轮堵塞点换算流量的变化趋势

Figure 8. The trend of maximum value of turbine flow function

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图 9 风车减速时发动机的性能参数响应

Figure 9. The response of engine performance parameter during deceleration of windmilling

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图 10 不同高度及马赫数下的风车特性

Figure 10. Windmilling characteristics at different altitudes and Mach numbers

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