Instrumented flow passage of a turbine engine
AssigneeSafran Aircraft Engines
InventorsJérémy Giordan, Valentine Lucette Bader, André Pierre Jean Xavier Leroux, Stéphane Rousselin
Life of this patent
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Abstract
An annular air flow passage, particularly for a turbine engine, comprising two radially internal and external annular walls. A measuring element is elongated in a direction between the internal and external annular walls, and a first of the internal or external ends of the element is fixed rigidly to a first of the internal or external walls. The element includes at least one tubular cavity extending along the element and supplied with pressurized fluid.
Claims9
An apparatus, comprising:
- an annular air flow passage including a radially internal annular wall and a radially external annular wall;
- a source of pressurized fluid;
- an elongated measuring element extending in a direction between the radially internal annular wall and the radially external annular wall, with an end of the measuring element fixed rigidly to the radially internal annular wall or the radially external annular wall, said measuring element comprises at least one tubular cavity extending along the measuring element and configured to receive pressurized fluid from the pressurized fluid source, the at least one tubular cavity being in a closed circuit with the source of the pressurized fluid.
Method for varying the stiffness of an elongated measuring element, in an annular flow passage having a radially internal annular wall and a radially external annular wall, the elongated measuring element extending in a direction between the radially internal annular wall and the radially external annular wall, with an end of the measuring element is fixed rigidly to the radially internal annular wall or the radially external annular wall, said measuring element comprising at least one tubular cavity extending along the measuring element and configured to receive pressurized fluid from a pressurized fluid source, the at least one tubular cavity being in a closed circuit with the source of the pressurized fluid;
- the method comprising:
- a) identifying the pressure in said at least one tubular cavity of the elongated measuring element;
- b) measuring the vibration frequency f1 of the elongated measuring element;
- c) determining the natural frequency fr1 of the elongated measuring element based on the pressure identified in the at least one tubular cavity and obtaining the absolute value |f1−fr1|;
- d) comparing the absolute value |f1−fr1| with a threshold and establishing a risk of resonance in response to determining that the absolute value is less than or equal to the threshold;
- and
- e) in response to establishing the risk of resonance, varying the pressure in the at least one tubular cavity of the elongated measuring element until the risk is no longer present.
Dependencies are inferred from the claim text.