• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>4th European Symposium on Aerothermodynamics for Space Vehicles, Oct 15-18, 2001, Capua, Italy >CORRELATION BETWEEN OUTER FLOW AND INTERNAL NOZZLE PRESSURE FLUCTUATIONS
【24h】

CORRELATION BETWEEN OUTER FLOW AND INTERNAL NOZZLE PRESSURE FLUCTUATIONS

机译：外流量与内部喷嘴压力波动之间的相关性

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

During ascent of space vehicles through the atmosphere strong turbulence and buffeting prevail in the base region. Furthermore in high expansion ratio nozzles there is a separation inside the nozzle at low altitude because of the ambient pressure. This separation possibly amplified by the buffeting can cause strong side loads on the nozzle throat. In the FFA HYP500 wind tunnel an investigation has been conducted where pressure fluctuations in the flow outside a nozzle have been introduced. The wind tunnel has been modified in such a way that all flow from the storage tanks passes through a nozzle, which for this test had an expansion ratio of 13.9. The nozzle acts as an ejector and the flow surrounding the nozzle is sucked through a rotating valve, which introduces a fluctuating ambient flow. Fluctuating frequencies in the range 0-900 Hz can be introduced. The installation is equipped with a total of 10 dynamic pressure transducers, 5 inside the nozzle and 5 for measurement in the outer flow. The tests conducted so far have been performed as a ramp up followed by a ramp down of nozzle feeding pressure at a constant ambient fluctuating frequency ranging between 0 to 300 Hz. The results show that there is a strong coupling between the outer flow and the flow in the separated region of the nozzle. Close to the shock the fluctuating pressure amplitude is larger than in the outer flow. The strongest coupling is at a frequency of 150 Hz. A few attempts have been done to determine the phase shift between the outer and inner pressure fluctuations but new tests at constant run conditions are needed for more accurate estimation.
机译：在航天器通过大气层上升期间，在基础区域中普遍存在强烈的湍流和振动。此外，在高膨胀比的喷嘴中，由于环境压力，在低海拔处喷嘴内部存在分隔。可能因抖振而加剧的这种分离会在喷嘴喉咙上产生很大的侧向载荷。在FFA HYP500风洞中，已经进行了调查，其中引入了喷嘴外部的流动中的压力波动。对风洞进行了修改，以使来自储罐的所有流量都通过喷嘴，该喷嘴的膨胀比为13.9。喷嘴用作喷射器，喷嘴周围的流体通过旋转阀吸入，该阀引入波动的环境流量。可以引入0-900 Hz范围内的波动频率。该装置总共配备了10个动压传感器，喷嘴内部5个，外部流量5个。迄今为止进行的测试是在喷嘴的进料压力以0到300 Hz的恒定环境波动频率进行斜升后进行的。结果表明，在外部流与喷嘴分离区域中的流之间存在强耦合。接近冲击时，波动压力幅度大于外部流量。最强的耦合频率为150 Hz。已经进行了一些尝试来确定外部压力波动和内部压力波动之间的相移，但是需要在恒定运行条件下进行新的测试才能进行更准确的估算。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号