Initial results from the NASA-Lewis wave rotor experiment
Initial results from the NASA-Lewis wave rotor experiment
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NASA-刘易斯波转子实验的初步结果
DOI：
10.2514/6.1993-2521
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
Dennis L. Fronek
中科院分区：
文献类型：
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作者：
Jack Wilson;Dennis L. Fronek
波转子可以充当喷气发动机的顶部循环，因为通过使用它们，可以在不增加涡轮入口温度的情况下提高燃烧温度。为了为此应用或任何其他应用设计波转子，需要了解损耗机制，以及设计参数如何影响这些损耗。 NASA LeRC 已经启动了一项在分流器循环上运行的 3 端口波转子实验，目的是确定损失。实验方案为三因素Box-Behnken设计，以通道开启时间、摩擦系数、泄漏间隙为因素。这些因素的变化是通过使用不同长度的两个转子、每个转子有两个不同的通道宽度以及可调节的泄漏间隙来提供的。在实验中，压力传感器安装在转子上，并在转子通道的入口和出口处给出作为旋转角度的函数的压力迹线。此外，皮托耙监控每个端口的停滞压力，孔板流量计测量质量流量。结果表明，在本实验中泄漏损失非常显着，但可以通过减小转子与壁的间隙间距来显着减少。
Wave rotors may play a role as topping cycles for jet engines, since by their use, the combustion temperature can be raised without increasing the turbine inlet temperature. In order to design a wave rotor for this, or any other application, knowledge of the loss mechanisms is required, and also how the design parameters affect those losses. At NASA LeRC, a 3-port wave rotor experiment operating on the flow-divider cycle, has been started with the objective of determining the losses. The experimental scheme is a three factor Box-Behnken design, with passage opening time, friction factor, and leakage gap as the factors. Variation of these factors is provided by using two rotors, of different length, two different passage widths for each rotor, and adjustable leakage gap. In the experiment, pressure transducers are mounted on the rotor, and give pressure traces as a function of rotational angle at the entrance and exit of a rotor passage. In addition, pitot rakes monitor the stagnation pressures for each port, and orifice meters measure the mass flows. The results show that leakage losses are very significant in the present experiment, but can be reduced considerably by decreasing the rotor to wall clearance spacing.