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首页> 外文期刊>Journal of Spacecraft and Rockets >Dynamic Response to Global Oscillation of Propulsion Systems with Cavitating Pumps
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Dynamic Response to Global Oscillation of Propulsion Systems with Cavitating Pumps

机译：空化泵对推进系统整体振动的动态响应

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摘要

A time-domain model was developed to evaluate the dynamic response of pumping systems in the accelerating environment of rockets with a focus on cavitation. The model was first verified by comparing the results with measurements in ground-based tests of an LE-7A rocket engine. In these tests, various resonances occurred and levels of pump cavitation or incorporation of an accumulator altered them. The model results simulated the test data well, matching both the frequency and the amplitude. The test and model results also demonstrated the stability of the LE-7A propulsion system within nonaccelerating environments. Then, the model was used to examine the response of the propulsion system in accelerating frames; sinusoidal vehicle oscillations over a range of frequencies were explored. Under noncavitating conditions, the pressure amplitudes within the propulsion system did not substantially exceed the quasi-static acceleration head response pah. However, under cavitating conditions (σ = 0.02), the same accelerations produced violent responses with pressure and flow amplitudes about 2 orders of magnitude greater than in noncavitating conditions. The obvious conclusion is that vehicle oscillations can cause substantial pressure and flow amplitudes, particularly when the pump is cavitating, even if the ground-based tests and the calculations in static frames indicate stable and well-behaved responses.
机译：建立了时域模型，以评估在火箭加速环境中泵送系统的动态响应，重点是空化。该模型首先通过将结果与LE-7A火箭发动机的地面测试中的测量结果进行比较来进行验证。在这些测试中，发生了各种共振，并且泵的气穴现象或蓄能器的引入改变了它们。模型结果很好地模拟了测试数据，使频率和幅度都匹配。测试和模型结果还证明了LE-7A推进系统在非加速环境中的稳定性。然后，使用该模型检查推进系统在加速框架中的响应。探索了在一定频率范围内的正弦波车辆振动。在非空化条件下，推进系统内的压力幅度基本上不会超过准静态加速度扬程响应pah。但是，在空化条件下（σ= 0.02），相同的加速度会产生剧烈的响应，其压力和流量幅度比非空化条件下大约2个数量级。显而易见的结论是，即使地面试验和静态框架中的计算表明响应稳定且行为良好，车辆的振动也会引起较大的压力和流量振幅，尤其是在泵出现气穴时。

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  • 来源
    《Journal of Spacecraft and Rockets》 |2011年第4期|p.599-608|共10页
  • 作者

    Shusuke Hori; Christopher E. Brennen;

  • 作者单位

    Japan Aerospace Exploration Agency, Tsukuba 305-8505, Japan;

    California Institute of Technology, Pasadena, California 91125;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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