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首页> 外文会议>ASME international mechanical engineering congress and exposition >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：静止流体中不稳定圆形非营养起动喷射器和泡芙的自我保护性能

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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：通过实验和理论地研究圆形非核糖湍流启动喷射喷射，浮搏和中断喷射器的自我保留性能，用于静止和不当环境中流动。该实验涉及含染料的淡水源注入仍然淡水的大型淡水箱内，具有使用摄像机获得的流量的图像。近源行为随着源特性而显着变化，但在距离源大于20-30次源直径的距离处观察到自我保留行为。在自保存区域内，归一化流动和径向穿透距离随着时间的函数而变化，符合自我保护的要求，对以下电力：1/2用于起始非核糖喷射器和非核糖泡芙的1/4。对泡芙的注射流体量的影响被虚拟起源的位置反射，其与小体积的注入的流体体积无关，但是对于典型的中断喷射的大容量的注入流体体积成比例。

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