Blade Row Interaction Effects on Compressor Measurements
Blade Row Interaction Effects on Compressor Measurements
复制标题
叶片排相互作用对压缩机测量的影响
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
A. Sehra
中科院分区：
文献类型：
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作者：
T. Shang;A. Epstein;M. Giles;A. Sehra
采用二维计算流体动力学（CFD）程序，结合跨声速风扇级的激光风速测量数据，研究了下游定子排对压气机转子性能测量的影响。定子的上游潜在影响导致转子叶片的非定常循环，这是转子周向位置的函数。这反过来又导致固定框架中时间平均温度和压力的非均匀周向模式。利用线性化的势流方法，结合温度和压力变化与环流扰动的解析理论，建立了一个相对快速的计算程序，并证明了与数值计算的良好一致性。参数化研究的结果表明，这种影响的大小是动静叶片排距和相对叶片数的强烈函数。其影响范围从大间距的高涵道比风扇可以忽略不计，到密集叶片排的高压气机典型的几个百分点的级压和温升。由于温度和压力扰动处于空间相位，因此只要在相对于定子的同一位置进行压力和温度测量，则对测量转子效率的净影响可以忽略不计。如果不是，则误差为±1.5%。轴向位置和定子载荷的影响相对较小。
,The influence of a downstream stator row on the measurement of compressor rotor performance has been examined using a two-dimensional computational fluid dynamic (CFD) code backed by laser anemometry data on a transonic fan stage. The upstream potential influence of the stator causes unsteady circulation about the rotor blades which is a function of the rotor circumferential position. This, in turn, results in a nonuniform circumferential pattern of time-averaged temperature and pressure in the stationary frame. A relatively fast calculational procedure using a linearized, potential flow approach coupled with an analytical theory relating the temperature and pressure variations to the circulation perturbation is developed and shown to give good agreement with the numerical calculations. The results of a parametric study show that the magnitude of this effect is a strong function of rotor-stator blade row spacing and relative blade counts. The effects range from negligible for large spacings typical of high bypass ratio fans, to several percent of the stage pressure and temperature rise for closely spaced blade rows typical of high compressors. Because the temperature and pressure perturbations are in spatial phase, the net effect on measured rotor efficiency is negligible so long as the pressure and temperature measurements are made in the same location relative to the stators. If they are not, errors of ±1.5% can result. The effects of axial position and stator loading are shown to be relatively small.