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首页> 外文会议>International Symposium on Air Breathing Engines >Numerical and Experimental Studies on Variable Geometry and Variable Camber Inlet Guide Vanes on Low Speed Axial Compressor Performance
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Numerical and Experimental Studies on Variable Geometry and Variable Camber Inlet Guide Vanes on Low Speed Axial Compressor Performance

机译：低速轴压压缩机性能变量几何和变弧形入口导向叶片的数值和实验研究

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The objective of the present work is to improve the performance of a high diffusion rotor at off-design conditions and to increase the stall margin of the compressor by implementing variable geometry inlet guide vane. The fixed IGV(inlet guide vane) blade is to be replaced with (i) a variable stagger IGV and (ii) a variable camber IGV. The experiments with the same set of axial compressor (rotor and stator) are carried out in a rig at various stagger angles of IGV. The numerical analysis are validated with the experimental results. An increase in the stall margin of 13.5% with variable geometry IGV compared to the fixed geometry IGV is observed. A reasonable match is obtained between the numerical and the experimental results except near stall, where experiment shows higher pressure ratio and higher efficiency. Numerical analysis under-predicts the stall margin compared to the experimental result. Based on the confidence attained by the above study, a numerical study had been done with a slotted tandem blade IGV for possible variable camber application in the same compressor. The study indicates that a variable camber slotted IGV can produce the same flow deflection as that by a variable stagger single blade IGV for same aerodynamic efficiency. However, the power required for activation of the aft slotted blade would be much less than that for the full IGV blade. Two performance schedules are proposed for increasing stable operating range at high pressure ratios and to increase efficiencies under off design operations. Two sets of performance curves are created for full blade IGV and for slotted blade IGV in which two operation schedules of the IGV blades are suggested.
机译：本作工作的目的是通过实现可变几何入口导向叶片来提高高扩散转子的性能，并通过实现变量几何入口导向叶片来增加压缩机的失速余量。固定的IGV（入口导向叶片）刀片将被（i）替换为可变错位IGV和（II）变量弧形IGV。具有相同一组轴向压缩机（转子和定子）的实验，在钻机中以各种交错角度的IGV。使用实验结果验证了数值分析。观察到与固定几何IGV相比，可变几何IGV的减速余量增加13.5％。在数值和实验结果之间获得合理的匹配，除了停滞附近，实验显示出更高的压力比和更高的效率。与实验结果相比，数值分析预测失速余量。基于上述研究所获得的信心，已经在同一压缩机中的开槽串联叶片IGV进行了数值研究。该研究表明，可变弧形开槽IGV可以产生与相同的空气动力学效率的可变错位单叶片IGV相同的流动偏转。然而，激活后槽叶片所需的功率远小于全IGV叶片的功率。提出了两个性能调度，用于增加高压比下的稳定工作范围，并在设计操作下提高效率。为完整刀片IGV创建两组性能曲线，并且用于开槽刀片IGV，其中建议了IGV叶片的两个操作时间表。

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