小开度下蒸汽阀型线对流动及噪声影响
Influence of Steam Valve Profile on Flow and Noise under Small Opening
摘要: 本文设计了6种不同小开度下阀门喉口型线，研究其对阀门流体域噪声影响的规律。通过Fluent软件稳态的k-ε两方程模型和非稳态FW-H的噪声模型分别探究蒸汽流体的流动特性与噪声特性，研究结果表明：在阀芯不改变的情况下，阀套型线弧线为凹线型时，其噪声水平比凸线型低近3%，但流量降低近12%。在相同方程幅值下，反波浪线比正波浪线降低1至2分贝。凸线型比波浪线声压均值高4分贝左右，凹线型则与波浪线声压值差距较小。
Abstract:
In this paper, 6 kinds of valve
throat lines with different small opening are designed to study the rule of
their influence on the noise in the valve fluid domain. The flow
characteristics and noise characteristics of the steam fluid were investigated
by Fluent’s steady-state k-equation model and unsteady FW-H noise model,
respectively. The results showed that the noise level was nearly 3% lower than
that of the convex type when the curve of the valve sleeve was concave than
that of the convex type without changing the spool. Under the same equation
amplitude, the inverse wavy line is 1 to 2 dB lower than the positive wavy
line. The convex line is about 4 dB higher than the wavy line, while the
concave line is less different from the wavy line.
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