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High Speed Two-Phase Boundary Layer Flow of Particle Dispersed Gas and Condensating Vapor

颗粒分散气体与冷凝水蒸气的高速两相边界层流

基本信息

批准号：
63460093
负责人：
YOSHIOKA Eisuke
金额：
$ 3.84万
依托单位：
Waseda University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63460093/
关键词：
Fluid mechanics Boundary layer Compressible two-phase flow Particle dispersed gas Condensation Computational fluid mechanics Shock tube experiment Boundary layer heat transfer 二相流圧縮性流れ境界層流壁面熱伝達壁面凝縮数値解析境界層制御圧縮性二相流れ衝撃

项目摘要

High speed flow of particle dispersed gases was studied with special concern to the boundary layer structures adjacent to solid walls. Both of solid and liquid particles were treated in the computational and experimental studies of two-phase shock tube flows. The result provides fundamental understanding about micro-structures in various applications of dispersed two-phase flow mechanics. The result and findings are summarized as follows :1. Two-phase flow measurement various systems and equipment were developed to measure two-phase flow quantities relating to the high speed transient and micro-scale phenomena in the flow. The wall heat transfer measurement were successfully conducted by utilizing a thin plutinum film gauge which was manufactured by ion-coating technique. A couple of a semi-conductor laser and a photo diode is utilized to qualify the dispersion of particles. Counting of particles during the flight at various location were made by setting up He-Ne laser and a photomulti … More plier optical systems. A special interferometry instrumentation was applied to measure thickness of condensation liquid film in a range of the thickness less than several times of the laser wavelength.2. Boundary layer structure of condensating mixture flow by wall cooling The structure was studied by two computational models of the mixture. In the first model treating respective particles, a spontaneous nucleation theory was introduced in an iterative analysis of the flat plate boundary layer. Profiles of temperature and concentration were obtained before the stage of forming a liquid film on the plate. However, due to a rapid and extreme change phase density, the iterative analysis became difficult. In the second model, the vapor phase is treated as a continuum by introducing a mass concentration equation into the N. S. equation system, and profiles of the two-phase flow separation on a curved wall were obtained. Further improvement is still necessary to obtain the process of forming liquid film in both of the model.Boundary layer structure modified by solid-particle concentration Lifting motion of particles was found by an iterative analysis of particle motion and the shear layer flow. Due to a transverse motion, collision between particles took place, and initially uniform dispersion changed downstream to take a non-uniform concentration. The particular feature is that the boundary layer is constituted with a clean gas layer adjacent to the wall and a highly concentrated layer of particles at a considerable distance from the wall. Heat transfer feature agreed well with the experiments. Less

本文研究了颗粒弥散气体的高速流动，特别关注固体壁面附近的边界层结构。在两相激波管流的计算和实验研究中，固体颗粒和液体颗粒都被处理。这一结果为分散两相流力学的各种应用提供了对微观结构的基本认识。研究结果和发现如下：1.两相流测量各种系统和设备被开发用于测量与流动中的高速瞬态和微尺度现象相关的两相流量。利用离子镀膜技术制作了一个薄的钚膜计，成功地进行了壁面传热的测量。利用半导体激光器和光电二极管对颗粒的分散进行了定量分析。用He-Ne激光器和光电倍增管对飞行过程中不同位置的粒子进行了计数 ...更多信息 plier光学系统采用专用的干涉测量仪器，在小于激光波长数倍的范围内测量冷凝液膜厚度.壁面冷却凝结混合物流动的边界层结构通过两种混合物计算模型研究了边界层结构。在第一个模型中，处理各自的颗粒，自发成核理论被引入平板边界层的迭代分析。在板上形成液膜的阶段之前获得温度和浓度的分布。然而，由于快速和极端的变化相密度，迭代分析变得困难。在第二个模型中，汽相被看作是一个连续体，通过引入一个质量浓度方程到N。S.方程组，得到了弯曲壁面上两相流分离的分布。两种模型中液膜形成过程仍需进一步改进。固体颗粒浓度修正的边界层结构通过颗粒运动和剪切层流动的迭代分析，发现了颗粒的升力运动。由于横向运动，颗粒之间发生碰撞，并且最初均匀的分散在下游改变为不均匀的浓度。其特征是边界层由靠近壁面的清洁气体层和离壁面相当远的高度集中的颗粒层构成。传热特性与实验结果吻合较好。少