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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental and numerical investigation of an 8-cm valveless pulsejet
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Experimental and numerical investigation of an 8-cm valveless pulsejet

机译：8厘米无阀脉冲射流的实验和数值研究

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摘要

This paper investigates the performance of a small scale pulsejet whose overall length is approximately 8 cm, the smallest pulsejet ever reported to the author's knowledge. Gas dynamics, acoustics and chemical kinetics were modeled to gain an understanding of various physical phenomena affecting pulsejet operation, scalability, and efficiency. Numerical simulations were performed utilizing CFX to model 3-D compressible vicious flow in the pulsejet using the integrated Westbrook-Dryer single step combustion model. The simulation results were validated with experimental data and provide physical insight into the pulsejet operation. The pulsejet was run in valveless mode on hydrogen fuel with either a forward-facing inlet or a pair of rearward-facing inlets. Pressure, temperature, thrust, and frequency were measured as a function of valveless inlet and exit lengths and different geometries. As expected, the rearward-facing inlet produced considerably more net thrust, although still not very efficient, with a TSFC of 0.02 kg/N-h. The operating frequency was found to scale with inlet length to the negative 0.22 power, in addition to the inverse of the overall length for valved pulsejet. (c) 2006 Elsevier Inc. All rights reserved.
机译：本文研究了总长约为8 cm的小规模脉冲喷射器的性能，这是作者所知最小的脉冲喷射器。对气体动力学，声学和化学动力学进行了建模，以了解影响脉冲喷射操作，可扩展性和效率的各种物理现象。利用CFX进行了数值模拟，使用集成的Westbrook-Dryer单步燃烧模型对脉冲喷射器中的3-D可压缩恶性流进行建模。仿真结果已通过实验数据验证，并为脉冲喷射操作提供了物理洞察力。脉冲喷射器在氢气燃料上以无阀模式运行，该氢气燃料具有一个前向入口或一对后向入口。测量压力，温度，推力和频率是无阀入口和出口长度以及不同几何形状的函数。正如预期的那样，后向进气口产生的净推力大得多，尽管仍然不是很有效，但其TSFC为0.02 kg / N-h。除了带阀脉冲喷射的总长度的倒数之外，还发现工作频率与入口长度成负比例的0.22幂成比例。 （c）2006 Elsevier Inc.保留所有权利。

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