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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Experimental and numerical investigations of choked air flow and heat transfer in a ball valve for optimization the cross-sectional area
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Experimental and numerical investigations of choked air flow and heat transfer in a ball valve for optimization the cross-sectional area

机译：球阀中窒息空气流量和热传递的实验性和数值研究，以优化横截面积

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Purpose- The purpose of this study is to understand the functional properties of ball valve in a compressible flow and simulation of experimental data collection of ball valve, was completely simulated.. Design/methodology/approach - Equations are solved according to finite volume and simplified algorithms. By measuring the flow parameters, including pressure and temperature at different points in the simulation circuit, flow coefficients and localized drop in the valve were determined in different openness cases of test valve and compared with experimental results. Determining a graph for flow coefficient variations in terms of the percentage of openness of the valve is very effective on the flow control as well as on optimizing its cross-section.. Findings - In the supersonic flow, flow coefficients and local drops of the valve are dependent on several parameters, including fluid flow rate. Flow coefficient graphs at different angles of the test valve show that by increasing the valve opening angle, the flow coefficient increases so that it reaches from 1.72 m~3/h at a 30° angle to 46.29 m~3/h at a 80° angle. It should be noted that these values in the experimental test were obtained 1.53 m~3/h and 49.68 m~3/hh, respectively, and the percentage difference of these values by simulation was obtained for the angle of 30 degrees 11.7% and for the angle of 80°, about 7% per hour at an angle of 80°. Also, the coefficients of localized loss at different angles of test valve show that by increasing the angle of opening of the valve, the amount of localized loss decreases, so that the average value of 1515.2 in the angle of 30° reaches 1.9 at an angle of 80°. The percentage difference of these values by simulation, for the angle of 30° and 3.5% for the angle of 80°, was about 11.1%. Originality/value- Determining a graph for flow coefficient variations versus the percentage of openness of the valve is very effective on the flow control as well as on optimizing its cross-section. In the supersonic flow, flow coefficients and local drop coefficients of the valve are dependent on several parameters, including fluid flow rate.
机译：目的 - 本研究的目的是了解球阀在可压缩流动中的功能性能和仿真的滚珠阀的实验数据收集，是完全模拟的。设计/方法/方法 - 方程根据有限体积和简化解决算法。通过测量流动参数，包括模拟电路中不同点处的压力和温度，在试验阀的不同开放式情况下确定阀中的流量系数和局部下降，并与实验结果相比。确定阀门开放百分比的流量系数变化的图对流量控制非常有效，以及优化其横截面。方法 - 在超音流，流量系数和阀门的局部滴依赖于几个参数，包括流体流速。在测试阀的不同角度下的流量系数图表明，通过增加阀门开度角度，流量系数增加，使其在80°的30°角到46.29 m〜3 / h达到1.72m〜3 / h。角度。应当注意，实验试验中的这些值分别获得1.53m〜3 / h和49.68m〜3 / hh，并获得通过模拟的这些值的百分比差，为30度11.7％的角度获得80°的角度，每小时约7％，以80°的角度。此外，通过增加阀门的开口角度，局部损耗的局部损耗系数表示，局部损耗的量减少，使得平均值为1515.2的角度为30°以为1.9 80°。通过模拟的这些值的百分比差异为80°的角度为30°和3.5％，为约11.1％。原始性/值 - 确定流量系数变化的图与阀门的开放性百分比对流量控制非常有效，以及优化其横截面。在超音速流动中，阀的流量系数和局部下降系数取决于几个参数，包括流体流速。

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