| 摘要: |
| 对预旋角度分别为30°,25°,20°和15°的预旋孔在压比1.1～1.9范围内的流量系数进行了实验测量和数值模拟。研究了压比和预旋角度对预旋孔进出口速度和气流角度、流量系数和预旋效率等参数的影响。流量系数的实验结果与计算结果符合良好,数据显示预旋孔流量系数和预旋效率随压比的增大显著增大。预旋角度的减小使流量系数基本保持不变,而预旋效率由于出气角度的减小而显著增大,最大增幅可达10％。 |
| 关键词: 预旋系统 预旋喷嘴 预旋孔 流量系数 预旋效率 |
| DOI： |
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| Effects of Pre-Swirl Angle on Flow Characteristics of Pre-Swirl Nozzle |
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LIU Gao-wen, LI Bi-yun, JIANG Zhao-wu, ZHANG Lin
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School of Power and Energy, Northwestern Polytechnical Univerity, Xi’an 710072, China
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| Abstract: |
| Experimental measurements and numerical simulations on the discharge coefficient of pre-swirl nozzles with pre-swirl angles 30°, 25°, 20° and 15°,respectively, were carried out under pressure ratio range 1.1~1.9. The effects of pressure ratio and pre-swirl angle on the velocity and flow angle at the nozzle inlet and outlet, discharge coefficient and pre-swirl effectiveness were investigated via CFD work. Experiment and CFD results of discharge coefficient coincide well with each other. Data show that the discharge coefficient and pre-swirl effectiveness increase with the increase of pressure ratio. It is observed that the decrease of pre-swirl angle will lead to an almost unchanged discharge coefficient,while the pre-swirl effectiveness raises remarkably because of decreasing flow exit angle, with a maximal increase of 10%. |
| Key words: Pre-swirl system Pre-swirl nozzle Pre-swirl hole Discharge coefficient Pre-swirl effectiveness |
