Effect of Nozzle Guide Vanes on Flow Parameters at the Exit of a Micro Gas Turbine Combustor
Bibliographic record
Abstract
The combustor and turbine of a gas turbine engine are directly connected, and their flow fields and performance are closely coupled. However, to reduce turn-around time and avoid numerical difficulties in the development of gas turbine engines, numerical simulations of gas turbine combustors are usually performed without turbine components attached. This decoupling approach is investigated numerically in this paper. A micro gas turbine combustor is used as a test model, and the two-phase, turbulent, reacting flow fields of the combustor with and without nozzle guide vanes (NGV) have been simulated. Complex flow phenomena such as cross-jet flows, separations, recirculation zones, conjugate heat transfers, fuel droplet heating, vaporizing and combusting etc. are observed. The flow features of axial and tangential velocities, Mach number, and static pressure at the combustor exit are substantially different between these two cases. The effect of NGV on the combustor flow field decreases as the distance away from the NGV leading edge increases. At the cross-section, one span upstream of the NGV leading edge, the distributions of flow parameters with and without NGV are almost the same. The findings suggest that for the present combustor configuration, simulations of the combustor and turbine components could be decoupled if the interfacing cross-section or combustor exit is located at one span upstream of NGV. The present study is still preliminary and the results could be configuration dependent. Further study on the combustor-turbine decoupling issue for a traditional gas turbine combustor is on the way.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".