一种新型旋涡发生体的数值模拟与研究

Numerical Simulation and Study of a New Type Vortex Shedder

旋涡发生体是涡街流量计的一个重要构件。它的形状对于涡街流量计的测量范围、测量精度、旋涡脱落稳定性以及旋涡强度都有很大的影响。本文利用Fluent对设计的一种新型旋涡发生体的流场进行了数值模拟。将该新型旋涡发生体与一种常用的梯形旋涡发生体进行了斯特劳哈尔数稳定性(旋涡脱落稳定性),旋涡强度以及压力损失方面的比较与研究。结果表明该新型旋涡发生体的斯特劳哈尔数在较大的雷诺数范围内都能保持一个常数,斯特劳哈尔数的稳定性也优于梯形旋涡发生体,所产生的旋涡强度比梯形旋涡发生体所产生的旋涡强度大得多。在雷诺数Re <199040的范围以内,两种旋涡发生体的压力损失相差很小。

Vortex shedder is an important component of vortex flowmeter. Its shape has great influence on the measurement range, measurement precision and vortex intensity of vortex flowmeter. In this paper, the flow field of a new type vortex shedder is numerically simulated by Fluent. The new vortex shedder is compared with a commonly used trapezoidal vortex shedder on the stability of Strouhal number (stability of vortex-shedding), vortex strength and irrecoverable pressure loss. The results show that the Strouhal number of the new type vortex shedder can maintain a constant within the larger Reynolds number range, and the stability of Strouhal number is better than that of the trapezoidal vortex shedder. The vortex intensity generated by the new type vortex shedder is much greater than that of the trapezoidal vortex shedder. Within the Reynolds number Re < 199040, the irrecoverable pressure loss of the two vortex shedder is almost the same.