What is the radial flow reaction turbine?

A radial turbine is a turbine in which the flow of the working fluid is radial to the shaft. The difference between axial and radial turbines consists in the way the fluid flows through the components (compressor and turbine).

How does a radial flow turbine work?

The turbine is positioned between the high-pressure water reservoir and the low-pressure water discharge line, normally at the base of a dam. The inlet is in the form of a spiral. Guide vanes lead the water tangentially to the turbine runner. This radial flow affects the runner blades, causing the runner to rotate.

What are the main parts of a radial flow reaction turbine?

Explanation: The main parts in a radial turbine are tight casing to prevent spill of water, runner, guide vanes, guide mechanism to regulate flow and draft to increase inlet pressure.

What is radial reaction?

Water will flow in radial direction in radial flow reaction turbines. Water may flow radially from outwards to inwards or from inwards to outwards. When water will flow through the runner, a part of pressure energy will be changing into kinetic energy. Water flowing through the runner will be under pressure.

What is the difference between axial-flow and radial flow?

“Axial” refers to the direction of flow produced by the impeller. Similar to the axial flow turbine, the term “radial” describes the flow of liquid resulting from the impeller. The radial turbine blades are welded to the hub with the blade surfaces parallel to the shaft.

What are parts of reaction turbine?

Francis turbine rotor typically has nine or more fixed blades. Water enters directly above and around the runner, then the waterfalls and turns the turbine. The other main components are the draft tube, gate, and spiral in addition to the corridor.

How many types of reaction turbine are there?

Mainly two types of reaction turbine: ( i ) Outward radial flow reaction turbine (ii) Inward flow reaction turbine.

What is radial flow and axial-flow?

Which one is a radial flow impellers?

The impeller blade is parallel to the axis of the impeller. Radial flow impellers are used for single and multi-phase mixing applications. Effective for gas-liquid and liquid-liquid dispersions.

How does water flow in a radial turbine?

Water will flow in radial direction in radial flow reaction turbines. Water may flow radially from outwards to inwards or from inwards to outwards. If water flows through the runner from outwards to inwards, turbines will be termed as inward radial flow turbine.

What are the different types of reaction turbines?

Different types of reaction turbine Different types of reaction turbine are A) Inward radial flow reaction turbine: Water flows from outward to inward B) Outward radial flow reaction turbine: Water flows from inward to outward C) Mixed flow : Water enters radially but leaves axially e.g.

How is a radial turbine different from an axial turbine?

Radial turbine. Whereas for an axial turbine the rotor is ‘impacted’ by the fluid flow, for a radial turbine, the flow is smoothly orientated perpendicular to the rotation axis, and it drives the turbine in the same way water drives a watermill. The result is less mechanical stress (and less thermal stress, in case of hot working fluids)…

How are vanes used in radial flow turbines?

This turbine consists of a cylindrical disc mounted on a shaft and provided with vanes around the perimeter. At inlet water flows into the wheel at the centre and then glides through radially provided fixed guide vanes and then flows over the moving vanes.