The integral characteristics of the deceleration and entrainment of water droplets by the counter flow of high-temperature combustion products

被引:29
作者
Strizhak, Pavel A. [1 ]
Volkov, Roman S. [1 ]
机构
[1] Natl Res Tomsk Polytech Univ, Inst Power Engn, 30 Lenin Ave, Tomsk 634050, Russia
基金
俄罗斯科学基金会; 俄罗斯基础研究基金会;
关键词
High-temperature gases; Combustion products; Water droplets; Deceleration; Entrainment; Evaporation; MIST CHARACTERISTICS; 2-PHASE FLOWS; HEAT-TRANSFER; FLUID-FLOW; GAS-FLOW; EVAPORATION; STREAM; DYNAMICS; VELOCITY; MOTION;
D O I
10.1016/j.expthermflusci.2016.01.018
中图分类号
O414.1 [热力学];
学科分类号
摘要
This paper presents the results of experimental investigations on the deceleration and entrainment of water droplets during their motion in the counter flow of high-temperature combustion products (up to 1900 K). High-speed video cameras (10(5) frames per second), specialized software applications (with continuous tracking functions), as well as panoramic optical methods (Particle Image Velocimetry, Stereoscopic Particle Image Velocimetry, Particle Tracking Velocimetry, Shadow Photography) registered the processes under study. We used several typical oils, gasoline, kerosene, acetone, and industrial alcohol to generate combustion products with a controlled high temperature. The initial sizes (radius) of droplets and their velocities were varied from 0.05 mm to 0.35 mm and from 0.5 m/s to 5 m/s. The velocities of counter motion of combustion products were varied from 0.1 m/s to 2.5 m/s. In this paper we have also determined the characteristic trajectory length of the droplets of different sizes until their complete stop (and subsequent entrainment) in the counter flow of high-temperature gases. As a result of studies, we summarized the research results through the establishment of Weber and Reynolds numbers ranges for droplets and gases, when the full stop and entrainment of droplets may occur. This paper also covers a comparison of the characteristics of water droplet deceleration under the conditions of non-stationary (when the temperature of combustion products varies from 1900 K to 400 K in channel) and nearly stationary (when the temperature is 1100 30 K) heat transfer. Thus, it has been found out that the values of these parameters correlate well (deviation did not exceed 7%) under such conditions (stationary and nearly stationary) during short heating (less than 0.5 s). (C) 2016 Elsevier Inc. All rights reserved.
引用
收藏
页码:54 / 65
页数:12
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