Simultaneous determination of particle size, velocity, and mass flow in dust-laden supersonic flows
Simultaneous determination of particle size, velocity, and mass flow in dust-laden supersonic flows
复制标题
同时测定含尘超音速流中的颗粒尺寸、速度和质量流量
DOI：
10.1007/s00348-022-03402-z
复制
发表时间：
2022
影响因子：
2.4
通讯作者：
A. Gülhan
中科院分区：
文献类型：
--
作者：
Dirk Allofs;D. Neeb;A. Gülhan
颗粒质量浓度和颗粒质量流量是描述两相流的基本参数，是颗粒数、颗粒尺寸、颗粒速度和颗粒密度的乘积。在研究粒子引起的加热增强时，这些参数的详细知识是必不可少的。在大多数以前的实验研究考虑颗粒诱导加热增强，只有平均颗粒质量流率，没有任何关系，测量的颗粒尺寸和速度内的流动或任何指示的测量不确定性。在这项工作中，颗粒数，单个颗粒的尺寸和速度测量在超声速流中的阴影和粒子跟踪测速（PTV）的装置。其目标是确定测量的不确定性，粒子的速度-尺寸关系，以及数量，尺寸，速度和质量流率的空间分布在喷嘴出口。实验是在喷管出口直径为30 mm的实验装置上进行的，马赫数Ma∞= 2.1，雷诺数Re∞= 8.2e ~（7 1/m）。使用由Al 2 O3制成的颗粒和高达60 µm的尺寸用于接种。实现了高达50 kg/m2 s的颗粒质量流率。结果表明，一个额外的校正程序减少了常见的软件的不确定性，从14%到小于6%的阴影法粒度测定。颗粒速度的计算值与实验值存在较大差异，颗粒的空间分布呈现出较大颗粒和较高质量流量集中在流动中心的特点。PTV法测定的颗粒质量流量不确定度高达50%;阴影法测定的颗粒质量流量不确定度小于17%。
The particle mass concentration and -mass flow rate are fundamental parameters for describing two-phase flows and are products of particle number, -size, -velocity, and -density. When investigating particle-induced heating augmentation, a detailed knowledge of these parameters is essential. In most of previous experimental studies considering particle-induced heating augmentation, only average particle mass flow rates are given, without any relation to measured particle sizes and -velocities within the flow or any indication of measurement uncertainty. In this work, particle number, individual particle sizes, and velocities were measured in a supersonic flow by means of shadowgraphy and particle tracking velocimetry (PTV). The goals are to determine measurement uncertainties, a particle velocity-size relation, and the spatial distribution of number, size, velocity, and mass flow rate across the nozzle exit. Experiments were conducted in a facility with a nozzle exit diameter of 30 mm, at Ma∞= 2.1 and Re∞= 8.2e7 1/m. Particles made of Al2O3and up to 60 µm in size were used for seeding. Particle mass flow rates up to 50 kg/m2s were achieved. It is shown that an additional correction procedure reduced common software uncertainties regarding shadowgraphy particle size determination from 14% to less than 6%. Discrepancies between calculated particle velocities and experimental data were found. In terms of spatial distribution, larger particles and a higher mass flow rate concentrate in the flow center. The determined particle mass flow rate uncertainty was up to 50% for PTV; for shadowgraphy, it was less than 17%.Graphical abstract
安装在边界层的双引擎风力涡轮机模型尾流的彩色 PIV
DOI：
--
发表时间：
2016
期刊：
影响因子：
--
作者：
T.Nakashima;T.Shiratori;Y.Murai;Y.Tasaka;Y.Takeda;E.J.Windhab;大友衆示，村井祐一，田坂裕司，Petr Denissenko;磯田 龍，大須賀 侑，小林寛尭，田坂裕司，村井祐一
通讯作者：
磯田 龍，大須賀 侑，小林寛尭，田坂裕司，村井祐一