Radiation Pyrometer for Gas Turbine Blades

Rohy, D. A.; Duffy, Thomas E.; Compton, W. A.

doi:10.4271/720159

Cited by 9 publications

(6 citation statements)

References 1 publication

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“…17 Even so, thermocouples measure such a small localized area in the flow that many probes are necessary to get reasonably accurate results. 8 The GE F404 engine, for example, used 8 thermocouples for EGT sensing. 18 (a) (b) Figure 5…”

Section: B Thermocouplesmentioning

confidence: 99%

“…Several factors stand in the way of this being an exact conversion: manufacturing tolerances, sensor errors, engine deterioration, and assumptions of component performances. 7,8 A margin of uncertainty must be introduced for any value that is synthesized based on sensor values as a result of these variations. Increasing the fidelity of a sensor model typically involves incorporating more parameters, or more actual sensor inputs.…”

Section: A Model-based Estimationmentioning

confidence: 99%

“…The signal must also be temperature compensated in the case where the detector output is sensitive its own temperature. 8 Signal processing electronics are also needed to linearize the signal since there is an exponential relationship between temperature and the detector voltage. Finally, there may be additional processing necessary depending on what type of measurement is being made.…”

Section: Pyrometermentioning

confidence: 99%

“…8 The system was designed to be a complete blade measurement system and was based on a pyrometer. Diffused junction silicon detectors were chosen due to their detectivity and spectral range over approximately 0.4 to 1.1 microns.…”

Section: Pyrometermentioning

confidence: 99%

See 3 more Smart Citations

A Review of Exhaust Gas Temperature Sensing Techniques for Modern Turbine Engine Controls

Moll¹,

Behbahani²,

Fralick³

et al. 2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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The exhaust gas temperature (EGT) is typically defined as the gas temperature at the exit of the turbine; the sensors used to measure this parameter are considered the most vulnerable elements of the entire turbine engine instrumentation. EGT measurement is considered a key parameter for optimizing fuel economy, diagnosis, and prognosis. The reason is that turbine blade temperature is a good indicator for normal life consumption of that blade. Currently, direct sensor measurements made on turbine modules are limited due to the extremely hot environment. Exhaust gas temperature (EGT) sensors located downstream from the highest temperature sections provide a means to roughly infer the temperatures seen by the turbine blades/disks. But these sensors, which themselves are subject to frequent failures, provide a fairly inaccurate indication of the actual metal temperature profiles. This is of particular importance for high performance military turbine engines where the margin between hot-section operating conditions and material limitations is shrinking. A future state is envisioned that would use emerging pyrometric, fiber optic, and laser-based sensing to accurately assess the condition and life usage of the hot section, on a blade-by-blade basis. Nomenclature= speed of sound = acoustic constant = distance between transceivers in acoustic pyrometer = molecular weight of the gas = gas pressure = universal gas constant = gas temperature = time of flight of acoustic signal in acoustic pyrometer = heat capacity ratio of the gas = gas density

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Section: B Thermocouplesmentioning

confidence: 99%

Section: A Model-based Estimationmentioning

confidence: 99%

Section: Pyrometermentioning

confidence: 99%

Section: Pyrometermentioning

confidence: 99%

See 2 more Smart Citations

A Review of Exhaust Gas Temperature Sensing Techniques for Modern Turbine Engine Controls

Moll¹,

Behbahani²,

Fralick³

et al. 2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

View full text Add to dashboard Cite

show abstract

“…A surface temperature change or an uncertainty of 10 K results in a 100 per cent impact on the lifetime for creep predictions and a 30 per cent oxidation life prediction [7]. A few minutes of operation at over-temperature conditions can result in dramatic reductions in the blade life [8]. This rapid loss of structural integrity places great importance on operating the turbine blades below their thermal design limit.…”

Section: Motivations For Accurate Temperature Measurementmentioning

confidence: 99%

Phosphor thermometry in gas turbines: Consideration factors

Khalid

Kontis

Behtash

2010

Proceedings of the Institution of Mechanical Engineers, Part G:

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There is an increasing demand for turbine engines with improved performance and efficiency. Gas turbine efficiencies can be increased if higher turbine inlet temperatures are achieved. However, the optimum temperature is prescribed by the balance between the benefits of thermal efficiency and material life. Accurate thermal maps can allow engines to operate closer to their design limit, and greatly facilitate the design of improved engines. This article provides a review highlighting the advantages and rationale of using phosphor thermometry over existing temperature measurement techniques, such as thermocouple and pyrometry. Although phosphor thermometry exhibits excellent characteristics to make accurate measurements, the high temperature and fast rotating engine environment presents some challenges with interrelated issues that would need to be collectively considered before a successful measurement system can be implemented. Examples include extreme blackbody radiation, restricted optical access and time to collect data, etc. These factors will impose temperature limits and greatly influence the design philosophy of the measurement system, including phosphor choice, bonding technique, excitation/detection methodologies, and probe design. This article aims to provide an overview of these consideration factors, with supplementary design notes and guidance to aid engineers design and develop successful phosphor thermometry measurement systems for such environments.

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Fast Response Turbine Pyrometry for High Temperature Gas Turbine Applications - Present State of Technology and Future Demands -

Schenk

Raake

1999

Local Strain and Temperature Measurement

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Radiation Pyrometer for Gas Turbine Blades

Cited by 9 publications

References 1 publication

A Review of Exhaust Gas Temperature Sensing Techniques for Modern Turbine Engine Controls

A Review of Exhaust Gas Temperature Sensing Techniques for Modern Turbine Engine Controls

Phosphor thermometry in gas turbines: Consideration factors

Fast Response Turbine Pyrometry for High Temperature Gas Turbine Applications - Present State of Technology and Future Demands -

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