Table of Contents
- 1 What is the significance of the characteristic curves?
- 2 What is turbine performance characteristics?
- 3 What do you understand by characteristic curves of a pump What is the significance of the characteristic curves?
- 4 What are the characteristics curves of hydraulic turbine?
- 5 What are the different characteristics of Francis turbine?
- 6 How pump characteristic curve is important for selection of any suitable pump?
- 7 What are the characteristic curves of a hydraulic turbine?
- 8 How is the speed of a turbine varied?
What is the significance of the characteristic curves?
A curve plotted on a graph from two axes, exposure and density, used to describe the characteristics and performance of sensitive emulsions. A characteristic curve is a graph of the relationship between the amount of exposure given a film and it’s corresponding density after processing.
What is the use of characteristic curves in turbine?
Characteristic curves of a hydraulic turbine are the curves, with the help of which the exact behavior and performance of the turbine under different working conditions, can be known. These curves are plotted from the results of the tests performed on the turbine under different working conditions.
What is turbine performance characteristics?
Hydraulic Turbines gives their best performance when they are operated at certain conditions of head, discharge, speed and output power. Model turbines are tested under different conditions of head, discharge, speed, power, efficiency.
What is turbine performance curve?
These are curves which are characteristic of a particular turbine which helps in studying the performance of the turbine under various conditions. These curves pertaining to any turbine are supplied by its manufacturers based on actual tests.
What do you understand by characteristic curves of a pump What is the significance of the characteristic curves?
The performance of a centrifugal pump can be shown graphically on a characteristic curve. A typical characteristic curve shows the total dynamic head, brake horsepower, efficiency, and net positive Suction head all plotted over the capacity range of the pump.
What does characteristic shape mean?
n. 1 a distinguishing quality, attribute, or trait.
What are the characteristics curves of hydraulic turbine?
The hydraulic turbine characteristic curve is used to express the energy conversion, cavitation and other aspects of the hydraulic performance, force properties and other properties at the different operating conditions, these properties is the external characteristic of the internal flow of turbine, known as the …
What is the significance of specific speed of a turbine?
Specific speed is an index used to predict desired pump or turbine performance. i.e. it predicts the general shape of a pump’s impeller. It is this impeller’s “shape” that predicts its flow and head characteristics so that the designer can then select a pump or turbine most appropriate for a particular application.
What are the different characteristics of Francis turbine?
Comparison of Francis turbine and Kaplan turbine
| Francis Turbine | Kaplan Turbine |
|---|---|
| Overall efficiency is good | Overall efficiency is better than Francis turbine |
| Requires large area | Requires less area |
| Normal speed of runner:90-1000 | Normal speed of runner:70-600 |
| Flow of water is radially and mixed flow type | Flow of water is axial |
What are pump characteristics curves?
The characteristic curve of a pump is the interaction of two variables that describe its performance: HEAD: the energy by unit of mass that the pump can supply to the fluid. FLOW RATE: the quantity of fluid that goes through a section in a certain period of time.
How pump characteristic curve is important for selection of any suitable pump?
It is also important to check that the flow rate and head of the pump are within the required specifications, which are normally presented as the Pump Characteristic curves. These plots play an important role in understanding the region in which the pump needs to be operated thus ensuring the life of the pump.
What is the best definition of characteristics?
: a special quality or trait that makes a person, thing, or group different from others physical/genetic characteristics.
What are the characteristic curves of a hydraulic turbine?
Characteristic curves of a hydraulic turbine are the curves, with the help of which the exact behavior and performance of the turbine under different working conditions, can be known. These curves are plotted from the results of the tests performed on the turbine under different working conditions.
What is constant efficiency curve in wind turbine?
• Constant efficiency curves: These curves are plotted from data which can be obtained • from the constant head and constant speed curves. The object of obtaining this curve is to • determine the zone of constant efficiency so that we can always run the turbine with • maximum efficiency.
How is the speed of a turbine varied?
• Constant head curves: Maintaining a constant head, the speed of the turbine is varied by • admitting different rates of flow by adjusting the percentage of gate opening. The power P developed is measured mechanically.
What is the relationship between head and operating speed and efficiency?
Efficiency and flow as a function of head and operating speed are typically summarized on a turbine performance hill curve. Turbine speed is constant across head range. Limits of operation is the performance range of the turbine e.g. for Francis turbine it is 65\% to 125\% of design head.