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首页> 外文会议>The 2001 ASME International Mechanical Engineering Congress and Exposition, 2001, Nov 11-16, 2001, New York, New York >SELF-PRESERVING PROPERTIES OF UNSTEADY ROUND NONBUOYANT TURBULENT STARTING JETS AND PUFFS IN STILL FLUIDS
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SELF-PRESERVING PROPERTIES OF UNSTEADY ROUND NONBUOYANT TURBULENT STARTING JETS AND PUFFS IN STILL FLUIDS

机译：静液中非稳态圆形非浮质湍流启动浆和浆的自保留性质

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摘要

The self-preserving properties of round nonbuoyant turbulent starting jets, puffs and interrupted jets were studied experimentally and theoretically for flows in still and unstratified environments. The experiments involved dye-containing fresh water sources injected into still fresh water within a large fresh water tank with images of the flows obtained using a video camera. Near-source behavior varied significantly with source properties but self-preserving behavior was observed at distances greater than 20-30 source diameters from the source. Within the self-preserving region, normalized streamwise and radial penetration distances varied as functions of time, in accord with requirements for self-preservation, to the following powers: 1/2 for starting nonbuoyant jets and 1/4 for nonbuoyant puffs. Effects of injected fluid quantity for puffs were reflected by the location of the virtual origin which was independent of injected fluid volume for small volumes but became proportional to injected fluid volume for large volumes typical of interrupted jets.
机译：在静态和非分层环境中，通过实验和理论研究了圆形非浮力湍流起始射流，抽吸和间断射流的自保持特性。实验涉及将含染料的淡水源注入到大型淡水箱中的淡水中，并使用摄像机获得水流图像。近源行为随源属性而变化很大，但在距源直径大于20-30的直径处观察到了自我保存行为。在自我保护区内，归一化的水流和径向穿透距离随时间的变化，根据自我保护的要求，变化为以下能力：1/2用于启动非浮力射流，1/4用于非浮力抽吸。抽吸产生的液体量的影响由虚拟原点的位置反映出来，虚拟原点的位置与小体积的注射液量无关，但与中断的典型喷嘴的大体积的注射液量成比例。

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