Loading…
Impact of flow unsteadiness on steady-state gas-path stagnation temperature measurements
Steady-state stagnation temperature probes are used during gas turbine engine testing as a means of characterising turbomachinery component performance. The probes are located in the high-velocity gas-path, where temperature recovery and heat transfer effects cause a shortfall between the measured t...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Default Article |
| Published: |
2018
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/2134/32973 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1818169728132186112 |
|---|---|
| author | Clare Bonham Mark Brend Adrian Spencer Katsuyoshi Tanimizu Dylan Wise |
| author_facet | Clare Bonham Mark Brend Adrian Spencer Katsuyoshi Tanimizu Dylan Wise |
| author_sort | Clare Bonham (1248966) |
| collection | Figshare |
| description | Steady-state stagnation temperature probes are used during gas turbine engine testing as a means of characterising turbomachinery component performance. The probes are located in the high-velocity gas-path, where temperature recovery and heat transfer effects cause a shortfall between the measured temperature and the flow stagnation temperature. To improve accuracy, the measurement shortfall is corrected post-test using data acquired at representative Mach numbers in a steady aerodynamic calibration facility. However, probes installed in engines are typically subject to unsteady flows, which are characterised by periodic variations in Mach number and temperature caused by the wakes shed from upstream blades. The present work examines the impact of this periodic unsteadiness on stagnation temperature measurements by translating probes between jets with dissimilar Mach numbers. For conventional Kiel probes in unsteady flows, a greater temperature measurement shortfall is recorded compared to equivalent steady flows, which is related to greater conductive heat loss from the temperature sensor. This result is important for the application of post-test corrections, since an incorrect value will be applied using steady calibration data. A new probe design with low susceptibility to conductive heat losses is therefore developed, which is shown to deliver the same performance in both steady and unsteady flows. Measurements from this device can successfully be corrected using steady aerodynamic calibration data, resulting in improved stagnation temperature accuracy compared to conventional probe designs. This is essential for resolving in-engine component performance to better than +/-0.5% across all component pressure ratios. |
| format | Default Article |
| id | rr-article-9229928 |
| institution | Loughborough University |
| publishDate | 2018 |
| record_format | Figshare |
| spelling | rr-article-92299282018-08-06T00:00:00Z Impact of flow unsteadiness on steady-state gas-path stagnation temperature measurements Clare Bonham (1248966) Mark Brend (1249170) Adrian Spencer (1252713) Katsuyoshi Tanimizu (3977732) Dylan Wise (7123631) Aerospace engineering not elsewhere classified Mechanical engineering not elsewhere classified Other engineering not elsewhere classified Temperature measurement Flow (Dynamics) Steady state Probes Temperature Mach number Calibration Unsteady flow Heat losses Engines Aerospace Engineering Mechanical Engineering Engineering not elsewhere classified Steady-state stagnation temperature probes are used during gas turbine engine testing as a means of characterising turbomachinery component performance. The probes are located in the high-velocity gas-path, where temperature recovery and heat transfer effects cause a shortfall between the measured temperature and the flow stagnation temperature. To improve accuracy, the measurement shortfall is corrected post-test using data acquired at representative Mach numbers in a steady aerodynamic calibration facility. However, probes installed in engines are typically subject to unsteady flows, which are characterised by periodic variations in Mach number and temperature caused by the wakes shed from upstream blades. The present work examines the impact of this periodic unsteadiness on stagnation temperature measurements by translating probes between jets with dissimilar Mach numbers. For conventional Kiel probes in unsteady flows, a greater temperature measurement shortfall is recorded compared to equivalent steady flows, which is related to greater conductive heat loss from the temperature sensor. This result is important for the application of post-test corrections, since an incorrect value will be applied using steady calibration data. A new probe design with low susceptibility to conductive heat losses is therefore developed, which is shown to deliver the same performance in both steady and unsteady flows. Measurements from this device can successfully be corrected using steady aerodynamic calibration data, resulting in improved stagnation temperature accuracy compared to conventional probe designs. This is essential for resolving in-engine component performance to better than +/-0.5% across all component pressure ratios. 2018-08-06T00:00:00Z Text Journal contribution 2134/32973 https://figshare.com/articles/journal_contribution/Impact_of_flow_unsteadiness_on_steady-state_gas-path_stagnation_temperature_measurements/9229928 CC BY 4.0 |
| spellingShingle | Aerospace engineering not elsewhere classified Mechanical engineering not elsewhere classified Other engineering not elsewhere classified Temperature measurement Flow (Dynamics) Steady state Probes Temperature Mach number Calibration Unsteady flow Heat losses Engines Aerospace Engineering Mechanical Engineering Engineering not elsewhere classified Clare Bonham Mark Brend Adrian Spencer Katsuyoshi Tanimizu Dylan Wise Impact of flow unsteadiness on steady-state gas-path stagnation temperature measurements |
| title | Impact of flow unsteadiness on steady-state gas-path stagnation temperature measurements |
| title_full | Impact of flow unsteadiness on steady-state gas-path stagnation temperature measurements |
| title_fullStr | Impact of flow unsteadiness on steady-state gas-path stagnation temperature measurements |
| title_full_unstemmed | Impact of flow unsteadiness on steady-state gas-path stagnation temperature measurements |
| title_short | Impact of flow unsteadiness on steady-state gas-path stagnation temperature measurements |
| title_sort | impact of flow unsteadiness on steady-state gas-path stagnation temperature measurements |
| topic | Aerospace engineering not elsewhere classified Mechanical engineering not elsewhere classified Other engineering not elsewhere classified Temperature measurement Flow (Dynamics) Steady state Probes Temperature Mach number Calibration Unsteady flow Heat losses Engines Aerospace Engineering Mechanical Engineering Engineering not elsewhere classified |
| url | https://hdl.handle.net/2134/32973 |