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首页> 外文会议>AMD-vol.257; American Society of Mechanical Engineers(ASME) International Mechanical Engineering Congress and Exposition; 20061105-10; Chicago,IL(US) >COMPUTATIONAL MODELLING OF FLUID FLOW IN RADIAL DIFFUSERS WITH IRREGULAR BOUNDARIES
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COMPUTATIONAL MODELLING OF FLUID FLOW IN RADIAL DIFFUSERS WITH IRREGULAR BOUNDARIES

机译：具有不规则边界的径向扩散器中流体流动的计算模型

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摘要

Radial diffusers are the basic geometry for the automatic valves in reciprocating hermetic compressors. In the present work numerical solutions pr the laminar isocoric flow in radial diffusers are performed to investigate the influence of some geometry modifications on the mass flow rate and on the resultant force on the valve. The numerical model was able to handle irregular geometries making use of a regular mesh, and was validated through comparisons with experiments. Results are presented in terms of the effective flow and force area of valves which are important efficiency parameters for the modelling and design of reciprocating hermetic compressors. The efficiency parameters are presented and explored in terms of small modification of the valve geometry, for Reynolds numbers varying from WOO to 2500 and two values of the gap between valve reed and valve seat. The flow was significantly affected by the geometry modifications, indicating that with little effort the performance of automatic valves can be substantialy improved. For instance, with a small chamfer of 5° at the outlet of the valve feeding orifice, the effective force area was increased by 30 percent.
机译：径向扩散器是往复式封闭式压缩机中自动阀的基本几何形状。在本工作中，进行了径向扩散器中层流等皮质流的数值解，以研究某些几何形状修改对质量流率和对阀的合力的影响。该数值模型能够利用规则的网格处理不规则的几何图形，并通过与实验的比较进行了验证。结果以阀的有效流量和受力面积表示，这是往复式封闭式压缩机建模和设计的重要效率参数。效率参数是通过对阀几何形状进行小的修改来提出和探讨的，其中雷诺数从WOO到2500不等，并且阀簧片和阀座之间的间隙为两个值。流量受几何形状修改的影响很大，这表明只需花费很少的精力，即可大大提高自动阀的性能。例如，在阀门进料孔出口处有一个5°的小倒角，有效力面积增加了30％。

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