Experimental research on the effect of processing technology of cascade test article on the performance measurement
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摘要: 针对近年来平面叶栅试验研究过程中出现的试验件加工问题，对直叶片加工工艺、有机玻璃栅板加工工艺以及成套叶栅试验件关键参数的检测方法进行了工艺试验和叶栅试验器试验验证。结果表明，综合考虑加工成本和粗糙度对性能的影响规律，建议高速高负荷叶栅叶片表面粗糙度应不低于Ra=1.6。航空有机玻璃的选材、加工工序、工艺以及装配使用不当会导致试验过程中出现应力纹和黑圈，从而对高速状态下的可视化测量造成不利影响。通过改进成套叶栅试验件关键参数的检测方法，试验件加工质量有了较大提升，有助于获得更为准确可靠的性能试验数据。Abstract: In order to solve the processing problems of the test article occurred in the cascade experimental research, investigation and study of the processing technologies of the test blade and Aero-Plexiglass sidewall have been carried out through processing test and experimental validation. And then the detection methods of the key parameters are put forward based on trilinear coordinates measuring instrument. It can be seen from the results that considering the processing cost and the effects of the blade surface roughness on the cascade performance, the suitable surface roughness of the blade for high speed and high load cascade is suggested to be not more than Ra=1.6. Stress lines and black areas may appear on the Aero-Plexiglass sidewall due to some factors, such as material selections, manufacturing procedures, processing technologies and improper assembly or use, etc., which would cause adverse effect on schlieren visual measurement in high speed state. The processing quality of the test article is greatly improved by developing the detection methods of the key parameters, which will be helpful to get more accurate and reliable performance data.
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Keywords:
- cascade test /
- processing technology /
- surface roughness /
- glass cascades /
- detecting technology
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图 2 不同试验雷诺数状态下叶片表面等熵马赫数分布
Fig. 2 Isentropic Mach number distribution at different Reynolds number states
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图 3 i=0°、Re=1.29×106时吸力面油流图片
Fig. 3 Suction side oil flow pictures at i=0°, Re=1.29×106
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图 4 不同试验马赫数状态下叶片表面等熵马赫数分布
Fig. 4 Isentropic Mach number distribution at different Mach number states
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图 5 总压损失系数随进口马赫数的变化曲线
Fig. 5 Total pressure loss variation with inlet Mach number at different blade surface roughness states
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图 7 存在抛光精磨问题的航空有机玻璃栅板
Fig. 7 Cascade models with Aero-Plexiglass sidewall which have polishing and fine grinding problems
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图 8 孔槽塌边造成的黑圈示意图
Fig. 8 Schilieren picture with black areas due to the chamfer edge collapse
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图 11 试验件尾缘直线度及栅距检测位置示意图
Fig. 11 Schematic diagram of detection methods for trailing edge straightness and pitch
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图 12 喉宽及安装角测量示意图
Fig. 12 Schematic diagram of detection methods for the throat width and stagger angle
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图 13 叶片表面等熵马赫数分布对比
Fig. 13 Comparison of isentropic Mach number distribution between adjacent channels
表 1 不同线切割方式对比
Table 1 Comparison of different wire-electrode cutting methods
走丝方式 走丝速度/(mm·s-1) 加工粗糙度(Ra) 特点 快走丝 10~20 2.4~3.2 电极丝高速往返运动, 精度低 中走丝 粗加工8~12
精加工1~31.2~1.6 多次切割，精度提高 慢走丝 ＜0.25 0.8及以上 电极丝低速单向运动，精度高 注：获得的加工粗糙度范围基于工艺试验 
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