【Mechanical Equipment Technology Exchange Edition】Mechanical Equipment 【Daily Question】20191008
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Question: What are the characteristics of velocity levels with reactivity? There are no answers provided for this series of posts; fellow netizens are free to share their own opinions – just reply with what you understand. Replies earn rewards ranging from 5 to 15 points; all forum members are welcome to participate actively and support the development of the forum! ! ! Chemical Equipment and Machinery
Steam at a velocity stage with reactance expands and accelerates only in the stator vanes; it does not expand any further in the rotor vanes, but merely changes its flow direction as the shape of the steam passage changes. The mechanical work done by the stage is equal to the change in kinetic energy of the steam stream within the rotor vanes.
Its characteristic is that the degree of expansion of steam in the moving blade cascade is the same as that in the nozzle.
This post was last edited by jlszhoujidai on 2019-10-9 09:29 ×
For impulse stages with reaction degree, the reaction degree ranges from 0.2 to 0.3; most of the steam expansion occurs within the nozzle, with only a small portion taking place in the rotor blades. Its working capacity is greater than that of a reaction stage, and its efficiency is higher than that of a pure impulse stage, making it widely used in steam turbines.
Steam at a velocity stage with reactance expands and accelerates only in the stator vanes; it does not expand any further in the rotor vanes, but merely changes its flow direction as the shape of the steam passage changes. The mechanical work done by the stage is equal to the change in kinetic energy of the steam stream within the rotor vanes.
Steam expands and does work in the moving blade cascade
For impulse stages with reaction degree, the reaction degree ranges from 0.2 to 0.3; most of the steam expansion occurs within the nozzle, with only a small portion taking place in the rotor blades. Its working capacity is greater than that of a reaction stage, and its efficiency is higher than that of a pure impulse stage, making it widely used in steam turbines.