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A sensor 11 detects the acoustic pressure at a first location in a combustion chamber 7 of a test rig 1 and produces an input signal which is a function of the acoustic pressure. A controller 13 receives the input signal and produces an output signal which is a function of the input signal. An acous

A sensor 11 detects the acoustic pressure at a first location in a combustion chamber 7 of a test rig 1 and produces an input signal which is a function of the acoustic pressure. A controller 13 receives the input signal and produces an output signal which is a function of the input signal. An acoustic actuator (16-18) receives the output signal and introduces into the combustion chamber 7 at a second location an acoustic pressure which is a function of the output signal. The acoustic actuator may comprise a fuel injector 18 or a loudspeaker. By using an appropriate control algorithm, acoustic boundary conditions corresponding to a particular gas turbine combustion chamber may be produced, at least in a certain frequency range.

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What is claimed is: 1. A test rig for testing the combustion of a fuel, the test rig comprising: a combustion chamber; and means for replicating the acoustic impedance of a combustor in the test rig, said replicating means comprising: a sensor configured and arranged to detect the acoustic pressure

What is claimed is: 1. A test rig for testing the combustion of a fuel, the test rig comprising: a combustion chamber; and means for replicating the acoustic impedance of a combustor in the test rig, said replicating means comprising: a sensor configured and arranged to detect the acoustic pressure at a first location in the combustion chamber and to produce an input signal which is a function of the acoustic pressure; a controller in communication with the sensor to receive the input signal and configured and arranged to produce an output signal which is a function of the input signal and the acoustic impedance of the combustor; and an acoustic actuator configured and arranged to receive the output signal and introduce into the combustion chamber at a second location an acoustic pressure which is a function of the output signal. 2. A test rig as claimed in claim 1, wherein the actuator comprises a loudspeaker. 3. A test rig as claimed in claim 1, wherein the actuator comprises a fuel valve controlled by the output signal and a fuel injector which is connected to the fuel valve and which injects fuel into the combustion chamber. 4. A test rig as claimed in claim 1, wherein the controller comprises a digital processor. 5. A test rig as claimed in claim 1, wherein the controller comprises a band-pass filter. 6. A test rig as claimed in claim 5, wherein the controller includes an amplifier. 7. A test rig as claimed in claim 6, wherein the controller includes a time-delay line. 8. A test rig as claimed in claim 7, wherein the time-delay line is between the band-pass filter and the amplifier. 9. A method of testing the combustion of a fuel in a test rig, in which a combustion chamber is defined downstream of a burner, the method comprising: adjusting the acoustic boundary conditions of the test rig, so as to at least in part replicate the acoustic impedance of a combustor in the test rig, the test rig comprising at least a sensor configured and arranged to detect the acoustic pressure at a first location in the combustion chamber and to produce an input signal which is a function of the acoustic pressure; a controller in communication with the sensor to receive the input signal and configured and arranged to produce an output signal which is a function of the input signal and the acoustic impedance of the combustor; and an acoustic actuator configured and arranged to receive the output signal and introduce into the combustion chamber at a second location an acoustic pressure which is a function of the output signal; installing said burner in said test rig; and testing said burner, including detecting the acoustic pressure at said first location in the combustion chamber; producing an input signal which is a function of the acoustic pressure; producing an output signal which is a function of the input signal; and introducing an acoustic pressure which is a function of the output signal into the combustion chamber at a second location, to adjust the acoustic impedance of the combustion chamber.