请教一个关于空气流量计

sbzczy

请教各位前辈一个问题：
AVL 台架的空气流量计是什么原理，具体型号是什么啊！

一般发动机测试，空气流量计是安装在什么位置呢？空滤之前？

安装了空气流量计会与会影响发动机进气阻力呢？

小弟先谢过前辈了

sbzczy

还有，为什么发动机上自带的空气流量计不能做台架测试用呢？ 精度不够吗

bbi3014

安装空气流量计，一般安装在过滤器之后，具体型号不记得了，拆下来看看就知道了！应该是没有阻力，管路式的！（仅供参考）
有时间可以去单位看看！

jimvan

热线式的，ABB生产的。原理英文如下：        The gas passes two temperature-sensitive resistors RS and RT, which are part of an electrical bridge circuit. In the case of the mass flow meter, specially developed and sturdy platinum thin-film resistors are used. Due to the selected resistance ratio RS « RT, RS is heated by the current IS and RT adapts the temperature of the gas.
       
        The current IS is set by an electronic control circuit (symbolically represented by an amplifier) in such a way that a constant temperature difference is established between the heated resistor RS and the temperature of the gas.
       
        The electric power generated in the resistor RS exactly compensates its heat loss to the flow. Since this heat loss depends on the number of particles striking the surface of the resistor RS, IS represents a measurement of mass flow.

lyxfdcwg

安了AVL的空流剂就不要发动机的空滤了吧，它自己带了个，发动机上的空流计不能在AVL设备上显示出数值来，型号的话上面都有，ABB的 型号和管径成正比