Experiment of aerodynamic performance of axial compressor at low Reynolds number condition
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摘要: 基于0.6 m连续式跨声速风洞的低密度环境运行能力，对主压缩机在不同总压下的气动性能进行了试验研究，详细分析了低密度环境下雷诺数对轴流压缩机气动性能的影响规律。试验中压缩机进口总压低至3 kPa左右，研究结果表明：随着雷诺数降低，压缩机增压能力和等熵效率均大幅下降，而喘振裕度受雷诺数的影响较小，负压工况轴系机械损失逐渐成为压缩机主要损失，对压缩机效率的影响较大。通过对试验数据的拟合得到了压缩机效率和压比随雷诺数变化的经验公式，可为轴流压缩机低雷诺数工况下的气动设计及数值方法研究提供数据支撑。Abstract: Aerodynamic performances of the axial compressor of the 0.6 m continuous transonic wind tunnel are tested under various pressure conditions, and the Reynolds number effects are studied experimentally. The lowest total pressure of the compressor inlet is about 3 kPa, and the corresponding Reynolds number is approximately 5×104. Test results show that the Reynolds number effects are significant when as Reynolds number is below the critical value, which is 5×105 in the compressor design. Compared to the large Reynolds number condition, the pressure ratio under the low Reynolds number condition reduces rapidly, while the surge margin changes slightly. The mechanical loss of the shaft becomes the major loss of the compressor as the operation pressure drops, and has a significant influence on the compressor efficiency. Additionally, the correlations of the pressure ratio and efficiency with Reynolds number, obtained by data analysis, can offer a useful reference for design and numerical simulation of the axial compressor under the at low Reynolds number condition.
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Key words:
- axial compressor /
- Reynolds number effect /
- surge margin /
- aerodynamic performance /
- experiment
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图 3 折合转速3520 r/min时不同总压下的压缩机流量–压比曲线
Figure 3. Influence of total pressure on compressor pressure ratio at 3520 r/min
图 4 折合转速3520 r/min时不同总压下的压缩机流量–效率曲线
Figure 4. Influence of total pressure on compressor isentropic efficiency at 3520 r/min
图 7 不同转速下雷诺数对压缩机升压能力的影响
Figure 7. Influence of Re on compressor capability of pressurization at different rotating speeds
图 8 雷诺数对叶片表面压力分布的影响
Figure 8. Influence of Re on pressure distribution of compressor blade
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