Research on key technologies of debugging and operating in 0.6m×0.6m continuous transonic wind tunnel
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摘要: 为了降低大型连续式风洞建设风险，在0.6m连续式风洞中开展了压缩机防喘振控制、转速控制、马赫数控制等调试运行关键技术研究。本研究采用压力波动法准确测量出了压缩机的喘振边界，通过设置合理的报警线和防喘振线，保证了压缩机的安全；采用矢量控制技术实现了转速的精确控制，控制精度达到0.03%的设计要求；采用压缩机转速、驻抽流量以及中心体开度与马赫数的函数关系，实现了马赫数的精确控制，控制精度达到了0.002的设计指标要求。通过研究各项关键技术实现了该风洞定总压、定马赫数的运行方式，该风洞具有优良的流场品质，是开展基础研究平台建设和大型连续式风洞引导性研究的理想平台。Abstract: In order to reduce the risk of constructing a large-scale continuous wind tunnel, research on key technologies is carried out in the 0.6m wind tunnel of China Aerodynamics Research and Development Center, such as anti surge control and speed control of the compressor, Mach number control, and so on. Pressure fluctuation method is used to measure the surge margin of the compressor accurately, and the security of the compressor can be well ensured by setting a reasonable alarm line and surge line. Vector control technology is used to achieve the accurate control of speed, and the 0.03% control precision is achieved. The accurate control of Mach number is achieved by the function relationship between the compressor speed, chamber flow, the centrosome displacement and the Mach number, and the 0.002 control precision is achieved. Through the research of the key technologies, the operation mode of fixing stagnation pressure and Mach number is realized. Due to the excellent quality of flow fields achieved in the wind tunnel, it is a good platform to carry out basic and leading research on the construction of large continuous wind tunnels.
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Key words:
- continuous wind tunnel /
- debugging /
- compressor /
- flow field /
- control precision
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图 8 稳转速状态下，转速与总压特性曲线
Figure 8. Rotating speed and stagnation pressure characteristic curves of steady state
表 1 转速控制精度测试结果
Table 1. Test result of the rotation control precision
转速/(r·min-1) 最大转速/(r·min-1) 最小转速/(r·min-1) 控制精度/% 1500 1500.61 1499.63 0.0136 1800 1800.54 1799.8 0.0103 2400 2400.88 2399.17 0.0238 3000 3000.73 2999.51 0.0169 3600 3601.2 3599.12 0.0289 
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表 2 辅压缩机转速对能耗的影响
Table 2. The effect of the assistant compressor’s rotation on energy consumption
Ma 流量阀开度 主机转速/(r·min-1) 主机功率/kW 辅机转速/(r·min-1) 辅机功率/kW 总功率/kW 1 1 2765 2060 6150 505 2565 1 1 2729 1960 8571 1000 2960
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