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首页> 外文期刊>International Journal of Refrigeration >Experimental investigation of a novel expansion device control mechanism: Vortex control of initially subcooled flashing R134a flow expanded through convergent-divergent nozzles
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Experimental investigation of a novel expansion device control mechanism: Vortex control of initially subcooled flashing R134a flow expanded through convergent-divergent nozzles

机译：一种新型膨胀装置控制机构的实验研究：初始过冷闪光R134A流动涡旋控制通过会聚发散喷嘴扩展

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Highlights?Nozzles of different geometries were studied for investigation of vortex control.?Vortex control of mass flow requires nozzle geometry with divergent exit.?Vortex control mechanism found to work effectively with two-phase fluid.?Visualization of nozzle flow under realistic conditions by high speed camera was provided.?“Bi-stable nozzle flow” phenomenon was observed.AbstractA novel expansion device refrigerant flow control mechanism called vortex control has been studied in this paper. This control mechanism is less vulnerable to clogging than conventional expansion device types since the flow control is achieved without having to adjust the cross-sectional flow area in order to achieve the desired modulation effect. Big potential is seen in applying vortex control to modulate the flow through ejector motive nozzles, because it can potentially provide flow control without sacrificing nozzle efficiency. Investigated in this paper were different nozzles flows with initially subcooled R134a. The effects of geometry variations and operating conditions were investigated experimentally. Flow visualizations were performed to gain further understanding of the complex two-phase flow in the vicinity of the nozzle throat. Maximum vortex control range of 42% has been obtained in the current study, which appears to be large enough to be suitable for numerous technical applications.]]>
机译：<！[cdata [ 亮点 ？ 研究了不同几何形状的喷嘴，用于涡旋控制的调查。 ？ 涡旋控制质量流量需要喷嘴具有分歧出口的几何。 ？ 涡旋控制机制发现有效地用两相流体工作。 ？ 在逼真的c下的喷嘴流的可视化提供高速相机的onditions。 ？ “双稳态喷嘴流动”现象。 抽象 研究了名为涡旋控制的新型扩展设备制冷机流量控制机制在本文中。该控制机构不如传统的膨胀装置类型堵塞，因为在不必调节横截面流动区域以实现所需调制效果的情况下实现流量控制。在应用涡旋控制时可以看到大潜力来调制通过喷射器动力喷嘴的流量，因为它可能会提供流量控制而不会牺牲喷嘴效率。在本文中研究了不同的喷嘴与最初过冷却的R134a流动。实验研究了几何变化和操作条件的影响。进行流程可视化以进一步了解喷嘴喉部附近的复杂两相流。目前研究的最大涡旋控制范围为42％，这似乎足够大，适用于许多技术应用。 ]]]>

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