涡轮流量计前导流器的结构与性能

对DN100气体涡轮流量计的关键部件之一前导流器引起的流量计压力损失进行试验测量和数值计算.对比分析两种不同结构前导流器对压力损失的影响,发现前导流器的结构变化不仅影响该部位的气流速度分布,使当地压力损失发生变化,更重要的是对后面各部件内的气体流动速度梯度和压力恢复也有明显影响,使总压损失进一步放大或减小.数值计算通过分析流动参数的变化从流动机理上解释了结构与压损间的关系.

Structure and Performance of Front Oriented-body in Turbine Flowmeter

Experiment and numerical simulation of the inner flow in DN100 gas turbine flowmeter are carried out. The pressure loss caused by the front oriented-body is especially analyzed, which is one of the key parts of turbine flowmeter. The pressure loss caused by two shapes of front oriented-body is compared. It is found that not only the velocity field and the local pressure loss are changed, but also the velocity grads and pressure value of gas flow in hinder parts are markedly influenced, when changing the shape of front oriented-body. The results present that the total pressure loss is magnified or reduced. Based on the analysis results of flow characteristics, the numerical simulation illustrates the correlation between shape and pressure loss on flow mechanism.