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Kayıt Tarihi: 22-Haziran-2025
Gönderilenler: 117
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| Gönderen: 09-Temmuz-2025 Saat 16:47 | Kayıtlı IP
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Selecting pitot probes for gas turbine combustion
chamber testing requires balancing high-temperature
resistance, measurement accuracy, and structural
stability, as the environment here is characterized by
temperatures exceeding 1000°C, high turbulence, and
potential corrosion from combustion by-products.
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Key considerations include material selection:
Inconel 718 is suitable for temperatures up to 800°C,
but for higher ranges (800-1200°C), Haynes 282 or
ceramic matrix composites (CMCs) are better choices. In
one test, an Inconel 718 probe showed signs of creep
after 500 hours at 900°C, while a CMC probe maintained
stability for over 1000 hours.
Structural design also matters. The probe head should
be streamlined to minimize airflow disturbance, with a
thickness of at least 1.2mm to resist thermal stress.
Holes must be laser-drilled to ensure precision, as even
a 0.02mm deviation can cause a 3% error in pressure
readings.
Calibration is critical too. High-temperature probes
require in-situ calibration using a reference
thermocouple and pressure sensor, as laboratory
calibration at room temperature may not account for
thermal expansion effects. A power plant test found that
uncalibrated probes overestimated total pressure by 5% in
the combustion zone.
When comparing options, CMC probes offer superior
temperature resistance but come at 3-4 times the cost of
Inconel models, making them ideal for long-term, high-
temperature applications. For intermittent testing below
800°C, Inconel 718 remains a cost-effective choice.
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Konu: Gas Turbine Combustion Chamber Testing Co
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