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Peer-Review Record

Evolution of Emission Species in an Aero-Engine Turbine Stator

by André A. V. Perpignan 1,*, Stella Grazia Tomasello 2 and Arvind Gangoli Rao 1,*
Reviewer 1: Anonymous
Reviewer 2: Anonymous
Reviewer 3: Anonymous
Reviewer 4: Anonymous
Submission received: 24 November 2020 / Revised: 22 December 2020 / Accepted: 23 December 2020 / Published: 4 January 2021
(This article belongs to the Special Issue Progress in Jet Engine Technology II)

Round 1

Reviewer 1 Report

Authors described the problem of emission species in gas turbines. The paper is good and interesting. Authors annalized problems of pollutant NOx and CO2 concentration and proliferation in engine. Work based on CFD and CRN analisis and models. After the state of the art, authors presented numerical models of chemical and CFD simulations. Finally, they discussed the results and make some conclusions. The last part should be developed. The work is interesting and results can be used by another research teams working on this important problems. results are important for reducing emission of pollutant in aeronautical gas-turbines. The form of paper and quality of edition are good too. I recomend publishing paper in present form. 

Author Response

We greatly thank the reviewer for his/her contribution and assessment. There were no requests for changes or improvements from the reviewer.

Reviewer 2 Report

Very good study offering a good insight into prior work performed around the subject and providing clear and sound conclusions to build on for future work.

Author Response

We greatly thank the reviewer for his/her contribution and assessment. There were no requests for changes or improvements from the reviewer.

Reviewer 3 Report

In page 464 TO  493

In the problem study , the reading will not find the solutions provided by the author, the proposed solutions to reduce the studied emissions, it just gives some recommendations please give more details

Author Response

We greatly thank the reviewer for his/her contribution and assessment.

 

The reviewer requested more details on possible solutions to reduce emissions. We made it clearer in line 479 that our analyses allow to conclude that whatever modelling approach that seeks to evaluate emission reduction strategies should include the high pressure turbine, and that is the main contribution of our work.

Reviewer 4 Report

In this paper, CFD and Chemical Reactor Network simulations were performed to analyze the progress of NOx and CO species through the high pressure turbine stator. Simulations considering turbulence-chemistry interaction were performed and compared with the finite-rate chemistry approach. The results show that relevant progression still takes place at the turbine stator. For an estimated cruise condition, both NO and CO concentrations are predicted to increase along the stator, while for the take-off condition, NO increases and CO decreases within the stator vanes.

I give my opinion on the suitability of the publication of this paper after the following revisions:

#1: Authors are encouraged to indicate with more details the main practical applications of this work.

#2: Authors may explain deficiencies or shortcomings of other new studies to make a bridge to introducing the novelty of their work.

#3: Some important and relevant references are missing, and they should be included in the background in this paper. It is recommendable for the authors to try to find some appropriate references from the Aerospace journal, in order to underline the connections of the manuscript with the aims and scope of this journal.

#4: A Conclusion should be given instead of Summary with a final note of the results obtained in the paper.

The paper, reference number: aerospace-1032334, titled: “Evolution of emission species in an aero-engine turbine stator”, from the authors: André A.V. Perpignan, Stella G. Tomasello and Arvind Gangoli Rao, is good, and I recommend it for publication in the journal: Aerospace, after suggested minor revision.

Author Response

We thank the reviewer for his/her contribution and assessment.

 

The reviewer requested some changes:

  • The main practical applications of our work were added in line 188.
  • The shortcomings of previous studies that were bridged by our study are described now in line 160.
  • We included relevant references from the Aerospace journal. We included the valuable studies of Matthes et al. [6] and Thoma et al. [11]. The former shows how the accurate prediction of NOx emissions from aero engines is also relevant for the climate, while the latter is an example of a recent work that utilizes a combustor correlation to estimate NOx emissions, which may not be sufficient, as our work concludes.
  • We modified the structure of our Conclusions section in order to make conclusions and recommendations clearer to the reader.
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