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Plume trajectory formation under stack tip self-enveloping

机译：烟囱尖端自包络下的烟流轨迹形成

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摘要

The phenomenon of stack tip self-enveloping and its influence upon the conditions of plume formation and on the trajectory of its motion are considered. Processes are described occurring in the initial part of the plume while the interaction between vertically directed flue gases outflowing from the stack and a horizontally directed moving air flow at high wind velocities that lead to the formation of a flag-like plume. Conditions responsible for the origin and evolution of interaction between these flows are demonstrated. For the first time, a plume formed under these conditions without bifurcation is registered. A photo image thereof is presented. A scheme for the calculation of the motion of a plume trajectory is proposed, the quantitative characteristics of which are obtained based on field observations. The wind velocity and direction, air temperature, and atmospheric turbulence at the level of the initial part of the trajectory have been obtained based on data obtained from an automatic meteorological system (mounted on the outer parts of a 250 m high stack no. 1 at the Naberezhnye Chelny TEPP plant) as well as based on the results of photographing and theodolite sighting of smoke puffs' trajectory taking into account their velocity within its initial part. The calculation scheme is supplemented with a new acting force—the force of self-enveloping. Based on the comparison of the new calculation scheme with the previous one, a significant contribution of this force to the development of the trajectory is revealed. A comparison of the natural full-scale data with the results of the calculation according to the proposed new scheme is made. The proposed calculation scheme has allowed us to extend the application of the existing technique to the range of high wind velocities. This approach would make it possible to simulate and investigate the trajectory and full rising height of the calculated the length above the mouth of flue-pipes, depending on various modal and meteorological parameters under the interrelation between the dynamic and thermal components of the rise as well as to obtain a universal calculation expression for determining the height of the plume rise for different classes of atmospheric stability.
机译：考虑了烟囱尖端自包封现象及其对羽流形成条件及其运动轨迹的影响。描述了在烟羽的初始部分发生的过程，同时从烟囱流出的垂直定向烟道气与高风速的水平定向移动气流之间的相互作用导致形成旗状烟羽。证明了负责这些流之间相互作用的起源和演化的条件。首次记录了在这些条件下形成的没有分叉的羽流。呈现其照片图像。提出了一种羽流轨迹运动的计算方案，并基于野外观测获得了其定量特征。基于从自动气象系统（安装在250 m高的1号烟囱的外部）上获得的数据，获得了轨迹初始部分的风速和风向，气温以及大气湍流。 （Naberezhnye Chelny TEPP装置），以及基于摄影和经纬仪观测烟团轨迹的结果，并考虑了烟团在其初始部分的速度。计算方案中增加了新的作用力-自包络力。在将新的计算方案与先前的计算方案进行比较的基础上，揭示了该力对轨迹发展的重大贡献。将自然的满量程数据与根据所提出的新方案的计算结果进行了比较。所提出的计算方案使我们能够将现有技术的应用扩展到高风速范围。这种方法将有可能模拟和研究烟道口上方长度的计算长度的轨迹和全上升高度，这取决于上升的动态和热成分之间的相互关系下的各种模式和气象参数。以获得用于确定不同类别的大气稳定性的羽状上升高度的通用计算表达式。

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