Multi-vane expanders: Internal-leakage losses
Multi-vane expanders: Internal-leakage losses
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DOI：
10.1016/0306-2619(85)90033-9
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发表时间：
1985
期刊：
影响因子：
11.2
通讯作者：
O. Badr;S. Probert;P. O'callaghan
中科院分区：
文献类型：
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作者：
O. Badr;S. Probert;P. O'callaghan
工作流体经由MVE中的内部泄漏路径的二次流动显著地导致其效率降低。因此，主要的泄漏通道进行了识别，并通过它们的流量预测的数学模型已经开发。两个现有的设计的MVEs的行为，使用R-113作为工作流体，被认为是。用计算机子程序预测了设计变量和操作变量变化对膨胀机泄漏特性的影响，预测结果表明，在两种MVEs中，主要的内泄漏流发生在叶片尖端。通过保持叶片的尖端和定子气缸之间的连续接触，对于非圆形膨胀机，预计泄漏效率超过75%。预测还显示了在最佳操作条件下运行现有膨胀机可以改善泄漏特性的程度。或者，对于建议的应用，将存在用于MVE的设计参数的最佳选择，使得可以实现最大效率。
Secondary flows of the working fluid via internal leakage paths in an MVE contribute significantly to its efficiency reduction. So the major leakage channels were indentified, and a mathematical model for predicting the flow rates via them has been developed. The behaviours of two existing designs of MVEs, using R-113 as the working fluid, were considered. Computer sub-routines were composed and employed to predict the effects of changes in the design and operating variables on the leakage characteristics of the expanders.The predictions indicate that the major internal-leakage flows, in the two MVEs considered, occur past the tips of the vanes. By maintaining continuous contact between the tips of the vanes and the stator cylinder, leakage efficiencies of over 75% are expected for the non-circular expander. The predictions also show by how much the leakage characteristics can be improved by running an existing expander at its optimal operating conditions. Alternatively for a proposed application, there will be an optimal choice of design parameters for an MVE so that the maximum efficiency can be achieved.