Study of Compound Choking Phenomena and Compound Shock Waves in Compressible Internal Flows

可压缩内流复合窒息现象与复合冲击波研究

• 批准号: 17360083
• 负责人: MATSUO Kazuyasu
• 金额: $ 9.48万
• 依托单位: The University of Kitakyushu
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360083/
• 关键词: Compressible Fluid; Supersonic Flow; Shock Wave; Compound choking; Compound Flow

1. The compound choking by confluence of two subsonic and parallel streams through a converging nozzle was experimentally investigated for various ratios of the upstream stagnation pressure to the back pressure. The critical pressure ratio across the converging nozzle when the compound choking occurs at the nozzle exit was obtained for various nozzles. Also, the critical pressure ratio of the compound choking was calculated where the mixing of the two streams is taken into consideration. The calculated results agree well with the present experimental results.2. The behavior of two subsonic streams through a single converging nozzle was numerically analyzed from the viewpoint of the choking of the compound nozzle flow. A new criterion of the compound choking was presented taking the growth of the sonic line extending across the entire exit passage into consideration. The present criterion was compared and discussed with the criterion of the previous flow model.3. Even when the compound flow of two subsonic and parallel streams through a converging nozzle is choked, the flow condition near the exit of the nozzle changes if the back pressure is reduced. This means that the compound choking is not established at the nozzle exit just as the one-dimensional isentropic theory assumes, but the compound choking occurs near a finite region near the exit.4. The pressure wave propagating against two parallel subsonic streams in a constant area straight duct was investigated by both one-dimensional analysis and experiment. From these studies, the characteristics of compound sound waves were made clear. The pressure wave propagating against the streams is bifurcated and the shape is three dimensional, but the propagation velocity is nearly equal to the value by the previous one dimensional flow model.

1. 在不同的上游滞止压力与背压比条件下，研究了两种亚音速平行流通过会聚喷嘴汇合时的复合窒息现象。得到了不同喷嘴出口处发生复合堵塞时的临界压力比。在考虑两流混合的情况下，计算了复合堵塞的临界压力比。计算结果与实验结果吻合较好。从复合喷管流动堵塞的角度，数值分析了两个亚音速流通过单个收敛喷管的行为。提出了一种考虑整个出口通道声线增长的复合窒息判据。将该准则与先前的流动模型准则进行了比较和讨论。即使当两个亚音速平行流通过会聚喷管的复合流被阻塞时，如果降低背压，喷管出口附近的流动状况也会发生变化。这意味着复合堵塞并不像一维等熵理论假设的那样发生在喷管出口，而是发生在靠近出口的有限区域附近。采用一维分析和实验相结合的方法研究了压力波在等面积直管内沿平行亚音速流传播的过程。通过这些研究，明确了复合声波的特性。压力波沿流的传播是分岔的，形状是三维的，但传播速度几乎等于以前的一维流动模型的值。

项目成果

先細ノズル流れのチョークに及ぼす境界層の影響に関する実験

边界层对锥形喷嘴流阻影响的实验

• 发表时间: 2007
• 期刊: 平成18年度衝撃波シンポジウム講演論文集
• 作者: I. Hosako;et. al.;宮里 義昭;Yutaka Kadoya;近藤陽介
• 通讯作者: 近藤陽介

Numerical Study of Compound Choking of Two Subsonic Streams

两种亚音速流复合扼流的数值研究

• 发表时间: 2006
• 期刊: Proc.of Asian Joint Workshop on Thermo-physics and Fluid Science
• 作者: I. Hosako;et. al.;Makiko Yonamine
• 通讯作者: Makiko Yonamine

Propagation of weak pressure waves against two parallel subsonic streams

• DOI: 10.1007/s11630-006-0135-2
• 发表时间: 2006-06
• 期刊: Journal of Thermal Science
• 影响因子: 2.5
• 作者: Makiko Yonamine;Takanori Ushijima;Y. Miyazato;M. Masuda;H. Katanoda;K. Matsuo

先細ノズル流れのチョークに関する実験

锥形喷嘴流阻实验

• 发表时间: 2007
• 作者: Yoshiaki;Miyazato;et. al.;宮里 義昭
• 通讯作者: 宮里 義昭

二つの亜音速流れの合流による複合チョークに関する数値解析

两个亚音速流汇合引起的复合扼流圈的数值分析

• 发表时间: 2006
• 期刊: 日本機械学会論文集 B編 72巻
• 作者: H. Yasuda;他;与那嶺 牧子
• 通讯作者: 与那嶺 牧子