Combustion chamber
First Claim
1. A combustion chamber comprising at least one combustion zone defined by at least one peripheral wall, at least one fuel and air mixing duct for supplying a fuel and air mixture to the at least one combustion zone, the at least one fuel and air mixing duct having an upstream end and a downstream end, fuel injection means for supplying fuel into the at least one fuel and air mixing duct, air injection means for supplying air into the at least one fuel and air mixing duct, the pressure of the air supplied to the at least one fuel and air mixing duct fluctuating, the air injection means comprising a plurality of air injectors spaced apart transversely to the direction of flow through the at least one fuel and air mixing duct, each air injector comprising a slot extending in the direction of flow through the at least one fuel and air mixing duct to reduce the magnitude of the fluctuations in the fuel to air ratio of the fuel and air mixture supplied into the at least one combustion zone;
- the volume of the fuel and air mixing duct being arranged such that the average travel time from the fuel injection means to the downstream end of the fuel and air mixing duct is greater than the time period of the fluctuation wherein the combustion chamber is a tubular combustion chamber, the tubular combustion chamber having a length and the slots in the fuel and air mixing duct having a length in the direction of flow through the at least one fuel and air mixing duct, the length of the slots in the direction of flow through the at least one fuel and air mixing duct being greater than four times the length of the tubular combustion chamber multiplied by the velocity of the fuel and air in the at least one fuel and air mixing duct divided by the average speed of sound inside the tubular combustion chamber.
1 Assignment
0 Petitions
Accused Products
Abstract
A three-stage lean burn combustion chamber (28) comprises a primary combustion zone (36), a secondary combustion zone (40) and a tertiary combustion zone (44). Each of the combustion zones (36, 40, 44) is supplied with premixed fuel and air by respective fuel and air mixing ducts (54, 70, 92). The fuel and air mixing ducts (54, 70, 92) have a plurality of air injection slots (62, 64, 76, 98) spaced apart transversely to the direction of flow through the fuel and air mixing ducts (54, 70, 92). The air injection slots (62, 64, 76, 98) extend in the direction of flow through the fuel and air mixing ducts (54, 70, 92) to the reduce the magnitude of the fluctuations in the fuel to air ratio of the fuel and air mixture supplied into the at least one combustion zone (36, 40, 44). This reduces the generation of harmful vibrations in the combustion chamber (28).
72 Citations
32 Claims
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1. A combustion chamber comprising at least one combustion zone defined by at least one peripheral wall, at least one fuel and air mixing duct for supplying a fuel and air mixture to the at least one combustion zone, the at least one fuel and air mixing duct having an upstream end and a downstream end, fuel injection means for supplying fuel into the at least one fuel and air mixing duct, air injection means for supplying air into the at least one fuel and air mixing duct, the pressure of the air supplied to the at least one fuel and air mixing duct fluctuating, the air injection means comprising a plurality of air injectors spaced apart transversely to the direction of flow through the at least one fuel and air mixing duct, each air injector comprising a slot extending in the direction of flow through the at least one fuel and air mixing duct to reduce the magnitude of the fluctuations in the fuel to air ratio of the fuel and air mixture supplied into the at least one combustion zone;
- the volume of the fuel and air mixing duct being arranged such that the average travel time from the fuel injection means to the downstream end of the fuel and air mixing duct is greater than the time period of the fluctuation wherein the combustion chamber is a tubular combustion chamber, the tubular combustion chamber having a length and the slots in the fuel and air mixing duct having a length in the direction of flow through the at least one fuel and air mixing duct, the length of the slots in the direction of flow through the at least one fuel and air mixing duct being greater than four times the length of the tubular combustion chamber multiplied by the velocity of the fuel and air in the at least one fuel and air mixing duct divided by the average speed of sound inside the tubular combustion chamber.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 31, 32)
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22. A combustion chamber comprising at least one combustion zone defined by at least one peripheral wall, at least one fuel and air mixing duct for supplying a fuel and air mixture to the at least one combustion zone, the at least one fuel and air mixing duct having an upstream end and a downstream end, fuel injection means for supplying fuel into the at least one fuel and air mixing duct, air injection means for supplying air into the at least one fuel and air mixing duct, the pressure of the air supplied to the at least one fuel and air mixing duct fluctuating, the air injection means comprising a plurality of air injectors spaced apart transversely to the direction of flow through the at least one fuel and air mixing duct, each air injector comprising a slot extending in the direction of flow through the at least one fuel and air mixing duct to reduce the magnitude of the fluctuations in the fuel to air ratio of the fuel and air mixture supplied into the at least one combustion zone;
- the volume of the fuel and air mixing duct being arranged such that the length of the fuel and air mixing duct multiplied by the frequency of fluctuations divided by the velocity of the fuel and air leaving the downstream end of the fuel and air mixing duct is at least one wherein the combustion chamber is a tubular combustion chamber, the tubular combustion chamber having a length and the slots in the fuel and air mixing duct having a length in the direction of flow through the at least one fuel and air mixing duct, the length of the slots in the direction of flow through the at least one fuel and air mixing duct being greater than four times the length of the tubular combustion chamber multiplied by the velocity of the fuel and air in the at least one fuel and air mixing duct divided by the average speed of sound inside the tubular combustion chamber.
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23. A combustion chamber comprising at least one combustion zone defined by at least one peripheral wall, at least one fuel and air mixing duct for supplying a fuel and air mixture to the at least one combustion zone, the at least one fuel and air mixing duct having an upstream end and a downstream end, fuel injection means for supplying fuel into the at least one fuel and air mixing duct, air injection means for supplying air into the at least one fuel and air mixing duct, the pressure of the air supplied to the at least one fuel and air mixing duct fluctuating, the air injection means comprising a plurality of air injectors spaced apart transversely to the direction of flow through the at least one fuel and air mixing duct, each air injector comprising a slot extending in the direction of flow through the at least one fuel and air mixing duct to reduce the magnitude of the fluctuations in the fuel to air ratio of the fuel and air mixture supplied into the at least one combustion zone;
- the volume of the fuel and air mixing duct being arranged such that the length of the fuel and air mixing duct multiplied by the frequency of fluctuations divided by the velocity of the fuel and air leaving the downstream end of the fuel and air mixing duct is at least two wherein the combustion chamber is a tubular combustion chamber, the tubular combustion chamber having a length and the slots in the fuel and air mixing duct having a length in the direction of flow through the at least one fuel and air mixing duct, the length of the slots in the direction of flow through the at least one fuel and air mixing duct being greater than four times the length of the tubular combustion chamber multiplied by the velocity of the fuel and air in the at least one fuel and air mixing duct divided by the average speed of sound inside the tubular combustion chamber.
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24. A combustion chamber comprising at least one combustion zone defined by at least one peripheral wall, at least one fuel and air mixing duct for supplying a fuel and air mixture to the at least one combustion zone, the at least one fuel and air mixing duct having an upstream end and a downstream end, fuel injection means for supplying fuel into the at least one fuel and air mixing duct, air injection means for supplying air into the at least one fuel and air mixing duct, the pressure of the air supplied to the at least one fuel and air mixing duct fluctuating, the air injection means comprising a plurality of air injectors spaced apart transversely to the direction of flow through the at least one fuel and air mixing duct, each air injector comprising a slot extending in the direction of flow through the at least one fuel and air mixing duct to reduce the magnitude of the fluctuations in the fuel to air ratio of the fuel and air mixture supplied into the at least one combustion zone;
- the length of an air injector in the direction of flow through the at least one fuel and air mixing duct multiplied by the frequency of the fluctuations divided by the velocity of the fuel and air inside the at least one mixing duct is at least one wherein the combustion chamber is a tubular combustion chamber, the tubular combustion chamber having a length and the slots in the fuel and air mixing duct having a length in the direction of flow through the at least one fuel and air mixing duct, the length of the slots in the direction of flow through the at least one fuel and air mixing duct being greater than four times the length of the tubular combustion chamber multiplied by the velocity of the fuel and air in the at least one fuel and air mixing duct divided by the average speed of sound inside the tubular combustion chamber.
- View Dependent Claims (25)
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26. A combustion chamber comprising at least one combustion zone defined by at least one peripheral wall, at least one fuel and air mixing duct for supplying a fuel and air mixture to the at least one combustion zone, the at least one fuel and air mixing duct having an upstream end and a downstream end, fuel injection means for supplying fuel into the at least one fuel and air mixing duct, air injection means for supplying air into the at least one fuel and air mixing duct, the pressure of the air supplied to the at least one fuel and air mixing duct fluctuating, the air injection means comprising a plurality of air injectors spaced apart transversely to the direction of flow through the at least one fuel and air mixing duct, each air injector comprising a slot extending in the direction of flow through the at least one fuel and air mixing duct to reduce the magnitude of the fluctuations in the fuel to air ratio of the fuel and air mixture supplied into the at least one combustion zone;
- the volume of the fuel and air mixing duct being arranged such that the average travel time from the fuel injection means to the downstream end of the fuel and air mixing duct is greater than the time period of the fluctuation wherein the combustion chamber is an annular combustion chamber, the annular combustion chamber having a diameter and the slots in the fuel and air mixing duct having a length in the direction of flow through the at least one fuel and air mixing duct, the length of the slots in the direction of flow through the at least one fuel and air mixing duct being greater than π
times the diameter of the annular combustion chamber multiplied by the velocity of the fuel and air in the at least one fuel and air mixing duct divided by the average speed of sound inside the annular combustion chamber.
- the volume of the fuel and air mixing duct being arranged such that the average travel time from the fuel injection means to the downstream end of the fuel and air mixing duct is greater than the time period of the fluctuation wherein the combustion chamber is an annular combustion chamber, the annular combustion chamber having a diameter and the slots in the fuel and air mixing duct having a length in the direction of flow through the at least one fuel and air mixing duct, the length of the slots in the direction of flow through the at least one fuel and air mixing duct being greater than π
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27. A combustion chamber comprising at least one combustion zone defined by at least one peripheral wall, at least one fuel and air mixing duct for supplying a fuel and air mixture to the at least one combustion zone, the at least one fuel and air mixing duct having an upstream end and a downstream end, fuel injection means for supplying fuel into the at least one fuel and air mixing duct, air injection means for supplying air into the at least one fuel and air mixing duct, the pressure of the air supplied to the at least one fuel and air mixing duct fluctuating, the air injection means comprising a plurality of air injectors spaced apart transversely to the direction of flow through the at least one fuel and air mixing duct, each air injector comprising a slot extending in the direction of flow through the at least one fuel and air mixing duct to reduce the magnitude of the fluctuations in the fuel to air ratio of the fuel and air mixture supplied into the at least one combustion zone;
- the volume of the fuel and air mixing duct being arranged such that the length of the fuel and air mixing duct multiplied by the frequency of fluctuations divided by the velocity of the fuel and air leaving the downstream end of the fuel and air mixing duct is at least one wherein the combustion chamber is an annular combustion chamber, the annular combustion chamber having a diameter and the slots in the fuel and air mixing duct having a length in the direction of flow through the at least one fuel and air mixing duct, the length of the slots in the direction of flow through the at least one fuel and air mixing duct being greater than 7t times the diameter of the annular combustion chamber multiplied by the velocity of the fuel and air in the at least one fuel and air mixing duct divided by the average speed of sound inside the annular combustion chamber.
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28. A combustion chamber comprising at least one combustion zone defined by at least one peripheral wall, at least one fuel and air mixing duct for supplying a fuel and air mixture to the at least one combustion zone, the at least one fuel and air mixing duct having an upstream end and a downstream end, fuel injection means for supplying fuel into the at least one fuel and air mixing duct, air injection means for supplying air into the at least one fuel and air mixing duct, the pressure of the air supplied to the at least one fuel and air mixing duct fluctuating, the air injection means comprising a plurality of air injectors spaced apart transversely to the direction of flow through the at least one fuel and air mixing duct, each air injector comprising a slot extending in the direction of flow through the at least one fuel and air mixing duct to reduce the magnitude of the fluctuations in the fuel to air ratio of the fuel and air mixture supplied into the at least one combustion zone;
- the volume of the fuel and air mixing duct being arranged such that the length of the fuel and air mixing duct multiplied by the frequency of fluctuations divided by the velocity of the fuel and air leaving the downstream end of the fuel and air mixing duct is at least two wherein the combustion chamber is an annular combustion chamber, the annular combustion chamber having a diameter and the slots in the fuel and air mixing duct having a length in the direction of flow through the at least one fuel and air mixing duct, the length of the slots in the direction of flow through the at least one fuel and air mixing duct being greater than π
times the diameter of the annular combustion chamber multiplied by the velocity of the fuel and air in the at least one fuel and air mixing duct divided by the average speed of sound inside the annular combustion chamber.
- the volume of the fuel and air mixing duct being arranged such that the length of the fuel and air mixing duct multiplied by the frequency of fluctuations divided by the velocity of the fuel and air leaving the downstream end of the fuel and air mixing duct is at least two wherein the combustion chamber is an annular combustion chamber, the annular combustion chamber having a diameter and the slots in the fuel and air mixing duct having a length in the direction of flow through the at least one fuel and air mixing duct, the length of the slots in the direction of flow through the at least one fuel and air mixing duct being greater than π
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29. A combustion chamber comprising at least one combustion zone defined by at least one peripheral wall, at least one fuel and air mixing duct for supplying a fuel and air mixture to the at least one combustion zone, the at least one fuel and air mixing duct having an upstream end and a downstream end, fuel injection means for supplying fuel into the at least one fuel and air mixing duct, air injection means for supplying air into the at least one fuel and air mixing duct, the pressure of the air supplied to the at least one fuel and air mixing duct fluctuating, the air injection means comprising a plurality of air injectors spaced apart transversely to the direction of flow through the at least one fuel and air mixing duct, each air injector comprising a slot extending in the direction of flow through the at least one fuel and air mixing duct to reduce the magnitude of the fluctuations in the fuel to air ratio of the fuel and air mixture supplied into the at least one combustion zone;
- the length of an air injector in the direction of flow through the at least one fuel and air mixing duct multiplied by the frequency of the fluctuations divided by the velocity of the fuel and air inside the at least one mixing duct is at least one wherein the combustion chamber is an annular combustion chamber, the annular combustion chamber having a diameter and the slots in the fuel and air mixing duct having a length in the direction of flow through the at least one fuel and air mixing duct, the length of the slots in the direction of flow through the at least one fuel and air mixing duct is greater than it times the diameter of the annular combustion chamber multiplied by the velocity of the fuel and air in the at least one fuel and air mixing duct divided by the average speed of sound inside the annular combustion chamber.
- View Dependent Claims (30)
Specification