注蒸汽对涡轮增压器的影响

水蒸气与燃气混合后的混合气体注入涡轮后，涡轮增压器会出现运行状态的变化。经对注蒸汽后的涡轮增压器进行了热力学的分拆，认为：汽气比的增大使增压器的转速、压气机空气流量和压气机压比增高；注汽温度对压气机压比有较小影响；低工况时，水蒸气的注入使涡轮的折合流量、膨胀比皆增大；在高工况时，膨胀比、折合流量能够增大的幅度减小：不同的汽气比对涡轮效率特性曲线影响较小。

The Influence of Steam Injection on a Turbocharger

After the injection of a gaseous mixture of steam and gas into a turbine a change in turbocharger operating condition will take place. In this connection the authors have performed a thermodynamic analysis of the turbocharger after steam injection. It is concluded that the increase in steam gas ratio will lead to an increase in turbocharger speed, compressor airflow rate and pressure ratio. The impact of injected steam temperature on compressor pressure ratio is relatively small. During part load operating conditions the injection of steam will result in an increase in turbine corrected flow rate and expansion ratio. During high load operating conditions the range of increase in expansion ratio and corrected flow rate diminishes. Different steam gas ratios have a relatively small influence on turbine efficiency characteristics.