【Mechanical Equipment Technology Exchange Edition】Mechanical Equipment 【Daily Question】20190918
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Question: What is the principle behind the impulse force generated when high-speed steam flows past the moving blades? 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
The steam flow exits from the nozzle and is ejected at high speed onto the blades. As this high-speed steam stream passes through the set of moving blades, the change in direction of the steam flow generates a thrust on the blades, which drives the impeller to rotate and perform work.
Steam expands in the nozzle, resulting in a decrease in pressure and an increase in velocity; thermal energy is converted into kinetic energy. As the high-speed airflow passes over the blades, it exerts a force on them, driving the impeller to rotate and perform work
High-speed flowing steam impels the turbine blades, causing the turbine rotor to rotate; the turbine rotor in turn drives the generator rotor, enabling the generator to produce electricity
According to Newton’s second law, when one object exerts a force on another object, that first object must experience a reaction force of equal magnitude but opposite direction to the applied force. Under the action of this force, another object moves or accelerates. This reaction force is called recoil force. The principle of using reaction force to do work is called the principle of reaction. In reaction turbines, steam not only expands in the nozzles, resulting in a decrease in pressure and an increase in velocity; the high-speed airflow exerts a thrust on the blades. Moreover, as the steam flows past the blades, it expands further, causing the steam to flow out more rapidly from the blades, and this also generates a reactive force, namely the reaction force, which drives the blades to rotate and perform work. This is the principle of reaction in reaction turbines.
The steam expands in the nozzle, causing the pressure to drop and the velocity to increase; thermal energy is converted into kinetic energy. As the high-speed airflow passes over the blades, it exerts a force on them, driving the impeller to rotate and perform work.
Steam expands in the nozzle, resulting in a decrease in pressure and an increase in velocity; thermal energy is converted into kinetic energy. As the high-speed airflow passes over the blades, it exerts a force on them, driving the impeller to rotate and perform work
When high-speed steam flows past the moving blades, the change in the direction of the steam generates a thrust on the blades, which drives the impeller to rotate and perform work.
The steam flow exits from the nozzle and is ejected at high speed onto the blades. As this high-speed steam stream passes through the set of moving blades, the change in direction of the steam flow generates a thrust on the blades, which drives the impeller to rotate and perform work.