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首页> 外文会议>Congress of Asia and Pacific Division of International Association of Hydraulic Engineering and Research >DEVELOPING FLOW REGION OF AXISYMMETRIC TURBULENT JETS
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DEVELOPING FLOW REGION OF AXISYMMETRIC TURBULENT JETS

机译：轴对称湍流喷射的流动区域

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In the developing zone of a circular jet diffusing in a co-flowing stream, the flow velocity changes from the jet velocity U0 to the uniform ambient velocity Ua. The thickness of the potential core gradually diminishes in the streamwise direction and beyond the potential core length,x0, no uniform flow region exists across the jet. The flow parameters at the location x0 act as the initial condition for the analysis of jets in the fully developed region. The excess velocity within the shear layer exhibits similarity and the integral technique is often adopted for prediction of the length of the potential core. The length of the potential core found from various theoretical models differs significantly. The present investigation is an adaptation of Reichardt's hypothesis and the point source technique. Using a single coefficient of expansion the velocity distribution in the annular shear layer is predicted. The transition from the developing to the developed flow zone takes place in a seamless fashion. The length of the potential core is estimated based on the predictions of the maximum velocity on the axis of the jet.
机译：在循环射流的显影区在共流流中扩散，流速从射流速度U0变为均匀的环境速度UA。潜在芯的厚度在流动方向上逐渐减小，并且超出潜在的芯长，X0，射流中不存在均匀的流动区域。位置X0的流量参数充当完全发达区域中喷射器的初始条件。剪切层内的过量速度表现出相似性，并且通常采用积分技术来预测潜在核心的长度。从各种理论模型中发现的潜在核心的长度显着不同。本调查是对Reichardt的假设和点源技术的适应性。使用单个膨胀系数膨胀系数，预测环形剪切层中的速度分布。从开发到发达流动区域的过渡以无缝方式发生。基于射流轴上的最大速度的预测来估计潜在核的长度。

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