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1、For practical reasons,most impulse turbines mount their buckets on the rims of disks (wheels),and nozzles feed steam from one side (Fig.6.9),Pressurized steam from the nozzle box flows through parallel converging nozzles formed by vane or foils.Steam leaves as a broad high-speed jet to flow through 2、the slower moving-bucket passages,which turn the steam flow to an axial direction as they absorb its kinetic energy.The steam leaves with lower internal energy and speed.由于實用性的原因，大部分沖擊式汽輪機把他們的葉片安裝在輪緣，并且噴嘴從一邊提供蒸汽。高壓蒸汽從噴嘴室流過由葉片或翼形成的平行的漸縮噴嘴。蒸汽離開的時候是一個寬闊的高速氣流，它流過較慢的動葉片通道，把蒸汽換向流到一個軸線方向，在那里吸收他們的動能。蒸汽帶著較低的3、內(nèi)能和速度離開。Steam pressure and speed vary through the true impulse stage.When the impulse stage are pressure-compouned,which are called Rateau stages,pressure drop occurs in steps and exhausted steam from one-stage folws through following similar impulse stages,where it expands to a lower pressure.If the impulse stages are velocity-compounded,which are called Curtiss stages,steam velocity is absor