Analysis of Aerodynamic Performance of Rotor Blade for a Reversible Axial Flow and Its Application to Jet Fan

可逆轴流转子叶片气动性能分析及其在射流风机中的应用

• 批准号: 13650186
• 负责人: NISHI Michihiro
• 金额: $ 2.24万
• 依托单位: Kyushu Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650186/
• 关键词: Axial Fan; Jet Fan; Tunnel Ventilation; Reversible Flow; Rotor Performance; Vortex Type; Aerodynamic Noise; 双方向流用翼形; 流力性能

A jet fan is a reversible axial flow fan fitted with upstream and downstream cylindrical silencers and has been used in a vehicle tunnel for longitudinal ventilation and safety measure to suppress the fire spreading in case of car accident. To secure more favorable vehicle tunnels, which should be planned based on minimizing the cost at construction and the energy consumption at operation, improvement of jet-fan performance is strongly expected. For switching flow direction promptly, a method to drive a rotor in the opposite direction is almost always adopted due to reliability. However, a rotor blade that gives high aerodynamic performance for both flow directions is still unclear, because it has been developed under the one-way flow.The purposes of present research for two years are to investigate the performance of a rotor blade associated with its geometry by using the CFD, and to evaluate the performance of a jet fan with rotor developed based on the CFD experimentally. In the fir … More st year, we confirmed that thin trailing edge is the most desirable among many parameters for camber-less blade section. Then, we designed a two stage jet fan, considering those factors such as blade load, noise, etc. We also paid attention to the vortex type of rotor blade, and selected peripheral component of absolute velocity being constant in the radial direction together with the forced vortex type. We conducted performance test of a proposed jet fan of 630 dia. Since the stand-alone test is necessary for a jet fan, an array of eight 3-holePitot tubes mounted on rotatable support was used to measure the air flow at the exit plane associated with rotational speed and blade setting angle as major parameters. From the test, we can see better jet-fan performance was achieved. Regarding the fan noise, as a typical example, sound pressure level was less than 90 dB even at the exit side under the shorter silencer of around 10%. Distributions of velocity and pressure at each plane upstream and downstream of rotors were also measured, and the corresponding results shows that the proposed vortex type is proper for a 2 stage jet fan having high aerodynamic performance. Further, we confirmed that the turbulent flow analysis was reasonably usable to predict the flow through a jet fan. Less

射流风扇是一种装有上下游圆柱形消声器的可逆轴流风扇，在车辆隧道中用于纵向通风和防止交通事故时火势蔓延的安全措施。为了确保更有利的车辆隧道，应在最小化建设成本和运行能耗的基础上进行规划，强烈期望改进喷气风扇的性能。为了快速切换气流方向，出于可靠性考虑，几乎总是采用反方向驱动转子的方法。然而，一种既能在两个流动方向上都具有较高气动性能的动叶，因为它是在单向流动下发展起来的，目前还不清楚。本课题为期两年的研究目的是利用CFD研究转子叶片的几何特性，并对基于CFD开发的带转子射流风扇的性能进行实验评价。在去年的冷杉试验中，我们证实了在无弧度叶片截面的众多参数中，较薄的后缘是最理想的。然后，综合考虑叶片负荷、噪声等因素，设计了两级射流风机。我们还关注了动叶的涡型，选择了径向绝对速度不变的外围分量和强迫涡型。我们对所提出的630直径的喷气风扇进行了性能测试。由于需要对喷气风扇进行独立测试，因此使用安装在可旋转支架上的8个3 holetot管阵列来测量出口平面的气流，并将转速和叶片设置角度作为主要参数。从试验中可以看出，所设计的喷气扇具有较好的性能。以风机噪声为例，在10%左右的短消声器下，即使在出口侧声压级也小于90 dB。对转子上下游各平面的速度和压力分布进行了测量，结果表明所提出的涡型适合于具有较高气动性能的二级射流风扇。进一步，我们证实了紊流分析可以合理地用于预测喷气风扇的流动。少

项目成果

Xiaomin LIU: "Time-Averaged Flow in a Conical Diffuser with Vortex Generator Jets"Proceedings of 4^<th> Int. Conference on Pumps and Fans. 18-27 (2002)

刘晓敏：“带涡流发生器射流的锥形扩散器中的时间平均流动”第 4 期国际会议论文集。

西 道弘: "損失と不安定現象"日本機械学会RC178非定常・不安定流動の制御・省エネ実用化研究分科会報告. 190-195 (2002)

Michihiro Nishi：“损失和不稳定现象”日本机械工程学会RC178非定常和不稳定流动的控制和实用节能研究小组报告190-195（2002）。

西 道弘: "円筒形エアインテークの圧力損失とその低減法"ターボ機械. 29. 730-735 (2001)

Michihiro Nishi：“圆柱形进气口的压力损失及其降低方法”《涡轮机械》29. 730-735 (2001)。

Xiaomin LIU: "Time Averaged Flow in a Conical Diffuser with Vortex Generator Jets"Proceedings of 4th International conference on Pumps and Fans. 18-27 (2002)

刘晓敏：“带涡流发生器射流的锥形扩散器中的时间平均流动”第四届泵和风机国际会议论文集。

Liu,X., Nishi,M., Yoshida,K., and Kishi,T.: "Time Averaged Flow in a Conical Diffuser with Vortex Generator Jets"Proceedings of 4^<th> International Conference on Pumps and Fans. 18-27 (2002)

Liu,X.、Nishi,M.、Yoshida,K. 和 Kishi,T.：“带涡流发生器射流的锥形扩散器中的时间平均流量”第 4 届泵和风机国际会议论文集。