| 考虑冷气掺混的重型燃气轮机变工况运行的精细建模及特性分析 |
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| 引用本文： | 华北电力大学 电站设备状态监测与控制教育部重点实验室,北京.考虑冷气掺混的重型燃气轮机变工况运行的精细建模及特性分析[J].热能动力工程,2017,32(2):59-68. |
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| 作者姓名： | 华北电力大学 电站设备状态监测与控制教育部重点实验室 北京 |
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| 作者单位： | 为了研究全工况下燃气轮机内部运行参数及其所具有的特性规律，以PG9351FA燃机为分析对象，建立具有冷气掺混的重型燃气轮机变工况运行精细模型。该模型采用半经验公式对燃机冷却空气掺混量进行估算，充分考虑了冷气掺混对透平性能的影响，以及马赫数、攻角对透平变工况运行时造成的气流参数变化及速度损失的修正。结果显示：所建模型的精度有所提高，利用其计算所得结果与厂家提供数据相比，数据误差可控制在±0.4%以内，可用于预估燃机在部分负荷工况下的运行特性。应用模型分析了透平背压变动对透平膨胀比分配、排气温度及输出功率（出功）的影响，得到了透平内部气体流动参数和性能参数以及分级特性规律，其结果更真实地反映了机组在特定运行策略是的全工况特性规律。 |
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| 基金项目： | 国家自然科学重点基金资助项目(批准号：51436006)；国家自然科学基金青年基金资助项目(No.51306049) |
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| 摘 要： | 为了研究全工况下燃气轮机内部运行参数及其所具有的特性规律,以PG9351FA燃机为分析对象,建立具有冷气掺混的重型燃气轮机变工况运行精细模型。该模型采用半经验公式对燃机冷却空气掺混量进行估算,充分考虑了冷气掺混对透平性能的影响,以及马赫数、攻角对透平变工况运行时造成的气流参数变化及速度损失的修正。结果显示:所建模型的精度有所提高,利用其计算所得结果与厂家提供数据相比,数据误差可控制在±0.4%以内,可用于预估燃机在部分负荷工况下的运行特性。应用模型分析了透平背压变动对透平膨胀比分配、排气温度及输出功率(出功)的影响,得到了透平内部气体流动参数和性能参数以及分级特性规律,其结果更真实地反映了机组在特定运行策略是的全工况特性规律。
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| 关 键 词： | 重型燃气轮机透平 变工况 冷却空气 气动函数 全工况性能 |
The Precise Modeling and Thermodynamic Characteristic Analysis for Heavy-Duty Gas Turbine with Coolant Injection at Off-Design Condition |
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| Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education,North China Electric Power University,Beijing,Chin,Post Code:.The Precise Modeling and Thermodynamic Characteristic Analysis for Heavy-Duty Gas Turbine with Coolant Injection at Off-Design Condition[J].Journal of Engineering for Thermal Energy and Power,2017,32(2):59-68. |
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| Authors: | Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education North China Electric Power University Beijing Chin Post Code: |
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| Affiliation: | To study the internal performance parameters and their characteristics of gas turbine under design/off design conditions, a precise model for heavy-duty gas turbine at off-design condition with cooling air injection was proposed based on PG9351FA gas turbine unit. The semi-empirical formula was adopted to estimate turbine specific cooling air mass flow. The air mixing impact on the thermodynamic performance of gas turbine, and the effects of Mach number and attack angle on flow parameters and the speed loss coefficients at off design conditions were also considered in this model. The results showed that the precision of the model is improved, and deviation between calculation results of this model and the manufacturer data is within ±0.4%,which can be used to analyze the part load characteristic of gas turbine. Additionally, the influence of varying back pressure on turbine expansion ratio distribution, exhaust temperature and power output was analyzed, and then the flow parameters inside turbine and performance parameters as well as characteristics of each stage were obtained, which more truly reflected the design/off-design performance under a given operation strategy. |
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| Abstract: | |
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| Keywords: | heavy-duty gas turbine off-design condition air cooling aerodynamic function design/off-design cycle performance |
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