Characteristics of Condensation Shock Waves

凝结冲击波的特性

• 批准号: 62550133
• 负责人: KAWAGOE Shigetoshi
• 金额: $ 1.22万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62550133/
• 关键词: Condensation shock wave; Nozzle flow; Total pressure loss; Moist air; Oblique shock wave; Interaction; Boundary layer; 蒸気タービン; 常軌タービン; 凝縮領域; 蒸発タービン

Condensing flow with a condensation shock wave initiated by an expansion of moist air in a supersonic nozzle was investigated numerically and experimentally, and then by inserting a wedge-type shock generator in the supersonic condensing flow, the interaction of the condensation shock wave with an oblique shock wave was investigated experimentally. As the results, the characteristics of condensation shock wave are clarified. The results obtaind are summarized as follows.(1) When condensation takes place in a nozzle, the entropy of the air increases and that of the vapor decreases. The surface entropy of a droplet generated by condensation increases a little. Therefore, the entropy of the mixture increases due to these effects. As the results, the total pressure of the flow decreases.(2) The calculated value of the total pressure loss are a little smaller than those of the experimental results and they are about 2 to 5 percent. The larger the initial degree of supersaturation, the initial temperature of moist air and the higher the expansion rate of nozzle are, the larger the total pressure loss becomes.(3) The position of the oblique shock wave relative to the condensation zone and the change of shape of the obligue shock wave due to condensation are clarified. The load working on the nozzle wall increases with an increasing in the initial degree of supersaturation and the initial temperature.(4) The interaction patterns of the condensation shock wave with the oblique shock wave are explained qualitatively. When a normal condensation shock wave interacts with an oblique shock wave, the oblique shock wave disappears under a certain condition. When the effect of condensation becomes stronger than this state, the normal condensation shock wave stands more upstream position and then the oblique shock wave appears again from the leading of wedge.

对超声速喷管中湿空气膨胀引发的凝结激波作用下的凝结流场进行了数值模拟和实验研究，并通过在超声速凝结流场中插入楔形激波发生器，对凝结激波与斜激波的相互作用进行了实验研究。结果表明，凝结激波的特征是明显的。所得结果总结如下。(1)当喷嘴中发生冷凝时，空气的熵增加，蒸汽的熵减少。凝结产生的液滴表面熵略有增加。因此，由于这些效应，混合物的熵增加。结果，流体的总压力降低。(2)总压损失的计算值略小于实验值，约为2 ~ 5%。初始过饱和度、湿空气初始温度和喷管膨胀率越大，总压损失越大。(3)阐明了斜激波相对于凝结区的位置以及由于凝结而引起的斜激波形状的变化。作用在喷管壁上的载荷随初始过饱和度和初始温度的增加而增加。(4)定性地解释了凝结激波与斜激波的相互作用模式。当正向凝结激波与斜激波相互作用时，在一定条件下，斜激波消失。当凝结效应变得比该状态更强时，正凝结冲击波位于更上游的位置，然后斜凝结冲击波从楔形物的前部再次出现。

项目成果

権純範: 日本機械学会論文集. 54. 798-802 (1988)

Junnori Gon：日本机械工程师学会会议记录 54. 798-802 (1988)。

Soon Bum KWON: "Total Pressure Loss in Supersonic Nozzle Flows with Condensation (Numerical Analyses)" JSME International Journal. 31. 16-21 (1988)

Soon Bum KWON：“超音速喷嘴冷凝流动中的总压力损失（数值分析）”JSME 国际期刊。

川越茂敏: 日本機械学会第66期全国大会講演会(昭和63年10月18日)において口頭発表 日本機械学会論文集.

Shigetoshi Kawagoe：在第 66 届日本机械工程师学会全国会议上的口头报告（1986 年 10 月 18 日），日本机械工程师学会会议记录。

Soon Bum KWON: "Effects of Condensing Flow on an Oblique Shock Wave in a Supersonic Nozzle" Transactions of the Japan Society of Mechanical Engineers. 54. 798-802 (1988)

Soon Bum KWON：“超音速喷嘴中冷凝流对倾斜冲击波的影响”日本机械工程师学会会刊。

Shigetoshi KAWAGOE: "Interaction of a Condensation Shock Wave with an Oblique Shock Wave in a Supersonic Nozzle" To be published in Transaction of the Japan Society of Mechanical Engineers.

Shigetoshi KAWAGOE：“超音速喷嘴中冷凝冲击波与倾斜冲击波的相互作用”将发表在日本机械工程师学会汇刊上。