| 1. | Based on the former result , the algorithm of two dimension and instantaneous void fraction is proposed and carry out through programming
在上述工作的基础上，本文给出了计算二维、瞬时掺气浓度的算法，并编程予以实现。 |
| 2. | The relationship between the air concentration and the scour depth can be expressed as an exponential function . aeration does not affect the shape of scour hole
掺气浓度c _对冲坑深度的影响，可表达为掺气浓度与冲坑无量纲深度的幂函数关系。 |
| 3. | Based on image process , a new method is proposed to measure void fraction without contact . this method breaks through the traditional point measure and sensor technology
本文突破了点测量和机械探头传感器等传统的掺气浓度测量方法，采用非接触测量法，首次将计算机图像处理技术应用于水流掺气浓度的实测。 |
| 4. | The result shows that the value of void fraction is reliable and can reflect the real status . in this paper the error source is analyzed and discussed and the approach of how to advance measure precision is proposed , which has significant fact meaning
文中还对采用图像处理计算掺气浓度过程中出现的误差可能来源及提高测量精度的途径进行了分析和探讨，这对于提高掺气浓度的计算精度具有重要意义。 |
| 5. | According to different optics - reverberation character of water and gas , this paper put forward how to identify gas from the gas - water digital image and how to f - urther calculate void fraction . the result shows that the method possesses relatively satisfactory precision
基于水和气体对光的反射特性的不同，提出了一种自动识别水气二相流中的气泡的数字图像处理方法，并进一步给出计算二维、瞬时掺气浓度场的算法。 |
| 6. | A kind of measurement was developed to measure the air concentration of water and the result showed the possibility of entrained air existing near the wall of drop shaft . that is to say , the wall of drop shaft may be protected by entrained air from cavitation damage to some extent
本文设计了一种适用于近壁区水流掺气浓度测量的方法，对空腔段水流掺气浓度进行初步测量，发现井壁附近水流存在掺气的可能，这对改善水流空化条件能起到积极作用。 |
| 7. | The content in this paper is preparatory attempt that combines image technique and gas water field measurement technology . this research make strong base for the further application of image technique in two phases flow of gas - water and has significant learning and practicable value
研究成果为今后进一步深入研究和推广计算机图像处理技术在水气两相流测量中的应用，打下了有力的基础;对提高水流掺气浓度的测量水平和精度，进而提高水力模型试验水平、满足工程设计要求等都具有学术意义和重要实用价值。 |
| 8. | The additional flow is formed by the device of dentoid baffle , and the application of the device of dentoid baffle cooperated with a stilling basin has been investigated by systematic model tests . based on the research results , the hydraulic problems such as the characteristics of hydrodynamic pressure and cavitation on the head of the denotid baffle , the properties of flow under the condition that the device of denotid baffle is used with a stilling basin , the hydraulic computation about a stilling basin , the estimation of energy dissipation and its various affection factors , the mechanism and effect of energy dissipation , and distributions of velocity and pressure and aerating concentration , etc , have been analyzed ; the method and step of hydraulic design of device of denotid baffle by which the additional flow is produced has also been proposed
文中利用齿墩设施实现附加射流，对齿墩设施与消力池联合应用进行了大量的和系统的模型试验，分析研究了中低佛劳德数条件下，齿墩墩头的动水压强及空化特性，齿墩设施与消力池联合应用时的流态特性，消力池的水力计算，消能量的估算及其各种影响因素，消能机理和效果，消力池内的流速、压强特性，掺气浓度分布等水力学问题，并提出了实现附加射流齿墩设施的水力设计方法和步骤。 |
| 9. | The fundamental theory and equations for the pressure fluctuation are described and the wall pressure fluctuation is measured . based on the experiment data , the characteristics of pressure fluctuations are analyzed in the three - phase flow of water , air and sand . the effects of air concentration and sediment content on the amplitude and frequency of pressure fluctuations are discussed
建立了多相流压强脉动基本方程，阐述了水流脉动压强基本理论，分析了压强脉动机理；根据试验数据，探讨了水、气、沙三相流体的压强脉动特性，初步得到了高速含沙掺气水流脉动压强的幅值特性与频域特性；提出了脉动压强强度系数、脉动压强极差系数与含沙量、掺气浓度的关系。 |
| 10. | At first , bubble flow image is acquired using laser and incandescence lamp respectively as light source and using ccd . according to different optics - dispersion character , threshold segmentation method is proposed to identify gas from the gas - water flow , which make steadfast base for further calculate void fraction . the precision of threshold directly affect the calculate precision of void fraction
文中分别采用激光片光源和影视灯照明，采用逐行扫描数字ccd摄像机获取气泡的流动图像；根据气泡和水对光的反射特性不同，提出采用阈值法识别图像中的气泡和水，从而为进一步计算掺气浓度打下坚实的基础。 |
