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ank_gl
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How is th degree of reaction defined for hydraulic turbine and a gas turbine??(i, actually, want a quantitative formula)
How is it optimized for a turbine??
How is it optimized for a turbine??
FredGarvin said:Degree of reaction is the ratio of static enthalpy drop across the turbine nozzle to the drop across the turbine. That being said, a hydraulic turbine is a reaction turbine with no nozzle drop so its degree of reaction would be 0. A gas turbine engine will vary depending on the drops. A degree of reaction of 50% means there is an equal drop across the nozzle as the turbine. Usually losses increase greatly after a R=1, so in that aspect a R<1 is more optimal. However, that is simply looking at the R value and no other design criteria.
FredGarvin said:I honestly can't comment on your use of head in stead of enthalpy for the DoR calculation.
This gives DoR of an impulse turbine as 1. All the enthalpy drop is in the nozzle.FredGarvin said:Degree of reaction is the ratio of static enthalpy drop across the turbine nozzle to the drop across the turbine
the ratio of enthalpy drop in rotor blades to the enthalpy drop in one stage(rotor + stator)
Going by your definition, it is apparent(assuming turbine means rotor). But that definition also give DoR of an impulse turbine as 1.As a note, you are not limited to a DoR between 0 and 1. It is simply a ratio so to get one larger than one, you simply need the stage's higher percentage of the enthalpy drop to happen across the rotor.
Degree of reaction is the ratio of static enthalpy drop across the turbine rotor to the drop across the turbine stage.
The degree of reaction is a measure of how far a chemical reaction has progressed towards completion. It is usually expressed as a percentage, with 100% indicating a complete conversion of reactants to products.
The degree of reaction can be calculated by dividing the change in moles of the limiting reactant by the initial moles of the limiting reactant, and then multiplying by 100. This will give the percentage of the limiting reactant that has been converted to products.
The degree of reaction is important because it helps us understand the efficiency of a chemical reaction. A higher degree of reaction means that more reactants have been converted to products, resulting in a higher yield and a more efficient reaction.
The degree of reaction is closely related to the equilibrium constant of a reaction. At equilibrium, the degree of reaction is 100%, meaning that the forward and reverse reactions are occurring at equal rates. Changes in the degree of reaction can indicate whether a reaction is proceeding towards or away from equilibrium.
No, the degree of reaction cannot be greater than 100%. This would indicate that more products have been formed than theoretically possible based on the amount of reactants present. However, the degree of reaction can approach 100% as the reaction proceeds towards equilibrium.