Assertion (A): A Kaplan turbine is an axial flow reaction turbine with...
Assertion (A): A Kaplan turbine is an axial flow reaction turbine with its vanes fixed to the hub.
Reason (R): Water flows parallel to the axis of rotation of the turbine and a part of the pressure energy gets converted to kinetic energy during its flow through the vanes.
Explanation:
A Kaplan turbine is a type of turbine used for hydroelectric power generation. It is an axial flow reaction turbine, which means that water flows parallel to the axis of rotation of the turbine. The turbine consists of a hub and a set of fixed vanes attached to the hub.
Assertion (A): A Kaplan turbine is an axial flow reaction turbine with its vanes fixed to the hub.
This statement is true. In a Kaplan turbine, the vanes are fixed to the hub and do not move. The water flows parallel to the axis of rotation of the turbine, and the fixed vanes help in directing the flow of water towards the rotor blades.
Reason (R): Water flows parallel to the axis of rotation of the turbine and a part of the pressure energy gets converted to kinetic energy during its flow through the vanes.
This statement is also true. In a Kaplan turbine, water enters the turbine through the spiral casing and flows parallel to the axis of rotation. As the water flows through the vanes, its pressure energy decreases and a part of it gets converted to kinetic energy. This conversion of pressure energy to kinetic energy is due to the shape and design of the vanes, which accelerate the flow of water.
Explanation of the Reason:
The reason given in the statement explains why water flows parallel to the axis of rotation and how a part of the pressure energy gets converted to kinetic energy during its flow through the vanes. The vanes of the turbine are designed in such a way that they accelerate the flow of water, which helps in increasing the kinetic energy of the water. This kinetic energy is then used to rotate the turbine blades and generate mechanical power.
Conclusion:
Both the assertion and the reason are individually true, and the reason correctly explains the assertion. Therefore, the correct answer is option 'A'. A Kaplan turbine is indeed an axial flow reaction turbine with its vanes fixed to the hub, and water flows parallel to the axis of rotation of the turbine while a part of the pressure energy gets converted to kinetic energy during its flow through the vanes.
To make sure you are not studying endlessly, EduRev has designed Mechanical Engineering study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Mechanical Engineering.