Investigation of Choking Phenomena of Supersonic Micro-nozzle Flow with Flashing Evaporation

闪蒸超音速微喷嘴流壅塞现象研究

• 批准号: 06452176
• 负责人: MATSUO Kazuyasu
• 金额: $ 5.31万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06452176/
• 关键词: Compressible fluid; Supersonic nozzle; Choking phenomenon; Flash evaporation; Micro-nozzle

1. When intitially subcooled high temperature and high pressure liquid is accelerated through a converging-diverging nozzle and is expanded beyond its asturation condition, flash evaporation occurs in the converging section or at the throat of the nozzle. The choking of such a flow with flash evaporation is classified into three patterns.2. The choking condition depends on the initial pressure and the subcooling of the compressible liquid. A flow model for calculating the critical massflux through the nozzle is presented assuming an isentropic, homogeneous, equilibrium two-phase flow. The mass flowrate calculated by the present model agrees well with the experimental results.3. When the flow choked at the nozzle throat, a pressure wave is generated and propagated upstream so as to adjust the upstream flow conditions. The propagation velocity of a pressure wave through a compressible gas-liquid two phase flow depends on the void fraction and the relation between them is established.4. The characteristics of supersonic micro-nozzle depends not only on the Mach number but also the Reynolds number based on the flow condition at the nozzle exit. The range of overexpansion, correct-expansion, and underexpansion of a such a nozzle is clarified, and the data of the critical flow rate through the supersonic micro-nozzle was obtained.

1。当通过收敛的喷嘴加速了杰作的高温高温和高压液体时，并扩展了超出其清晰度的条件时，闪光蒸发发生在收敛部分或喷嘴的喉咙中。使用闪光蒸发的这种流动的窒息被分为三个模式。2。窒息条件取决于最初压力和可压缩液体的亚冷却。假设具有等凝，均质，平衡的两相流量，则显示用于通过喷嘴计算临界大量群体的流模型。本模型计算得出的质量流量与实验结果非常吻合3。当流动在喷嘴喉咙上的流动时，会产生压力波并在上游传播，以调节上游流动条件。压力波通过可压缩气体液的两相流量的传播速度取决于空隙部分，并且建立了它们之间的关系。4。超音速微鼻腔的特征不仅取决于马赫数，还取决于基于喷嘴出口处流量条件的雷诺数。阐明了这样的喷嘴的过度膨胀，正确的膨胀和不渗透的范围，并获得了通过超音速微鼻腔的临界流量数据。

项目成果

Kazuyasu Mastuo, et al.: "Critical Flow Rate of Flashing Subcooled Water through a Converging Nozzle" Engineering Sciences Reports, Kyushu University. 18-1. 11-18 (1996)

Kazuyasu Mastuo 等人：“通过收敛喷嘴的闪蒸过冷水的临界流量”工程科学报告，九州大学。

片野田洋: "不足膨張軸対称超音速噴流の数値計算" 日本機械学会論文集. 61・589. 3236-3242 (1995)

Hiroshi Katanoda：“欠膨胀轴对称超音速射流的数值计算”日本机械工程师学会会刊 61・589 3236-3242（1995）。

宮里義昭: "超音速ノズルにおける過膨張流れの特性" 可視化情報. 15. 23-26 (1995)

Yoshiaki Miyazato：“超音速喷嘴中过度膨胀流的特性”可视化信息。15. 23-26 (1995)

Hiroshi Katanoda, et al.: "Numerical Calculation of Underexpanded Axisymmetric Supersonic Jet" Transaction of Japan Society of Mechanical Engineers. 61-589. 3236-3242 (1995)

Hiroshi Katanoda 等人：“欠膨胀轴对称超音速射流的数值计算”日本机械工程师学会会刊。

片野田洋: "不足膨張軸対称超音速噴流の数値計算" 日本機械学会論文集. 61. 3236-3242 (1995)

Hiroshi Katanoda：“欠膨胀轴对称超音速射流的数值计算”日本机械工程师学会会刊 61. 3236-3242 (1995)。